USB Module

The Texas Instruments USB Library is a set of data types and functions for creating USB device, host, or dual mode applications. The contents of the USB library and its associated header files fall into four main groups: general purpose functions, device mode specific functions, host mode specific functions, and mode detection and control functions. The set of general purpose functions are those that are be used in device, host, and dual mode applications. These include functions to parse USB descriptors and configure features of the USB library. The device specific functions provide the class-independent features required by all USB device applications such as host connection signalling and responding to standard descriptor requests. The USB library also contains a set of modules that handle the class specific requests from the USB host as well as a layer to interact with an application. The USB library provides a set of lower level class-independent host functions required by all USB host applications such as device detection and enumeration, and endpoint management. This lower layer remains mostly invisible to the application, but can be exposed to the application via class specific USB host modules. Like the device mode layer, the host mode class specific modules provide an interface to allow the lower level USB library code to communicate directly over the USB bus and also has a higher level interface that interacts with the application.

group usb_api

Defines

USB_VBUS_VALID 0x0001
USB_ID_HOST 0x0002
USB_ID_DEVICE 0x0000
USB_PFLT_ACTIVE 0x0004
USB_INTCTRL_ALL 0x000003FF
USB_INTCTRL_STATUS 0x000000FF
USB_INTCTRL_VBUS_ERR 0x00000080
USB_INTCTRL_SESSION 0x00000040
USB_INTCTRL_SESSION_END 0x00000040
USB_INTCTRL_DISCONNECT 0x00000020
USB_INTCTRL_CONNECT 0x00000010
USB_INTCTRL_SOF 0x00000008
USB_INTCTRL_BABBLE 0x00000004
USB_INTCTRL_RESET 0x00000004
USB_INTCTRL_RESUME 0x00000002
USB_INTCTRL_SUSPEND 0x00000001
USB_INTCTRL_MODE_DETECT 0x00000200
USB_INTCTRL_POWER_FAULT 0x00000100
USB_INTEP_ALL 0xFFFFFFFF
USB_INTEP_HOST_IN 0xFFFE0000
USB_INTEP_HOST_IN_15 0x80000000
USB_INTEP_HOST_IN_14 0x40000000
USB_INTEP_HOST_IN_13 0x20000000
USB_INTEP_HOST_IN_12 0x10000000
USB_INTEP_HOST_IN_11 0x08000000
USB_INTEP_HOST_IN_10 0x04000000
USB_INTEP_HOST_IN_9 0x02000000
USB_INTEP_HOST_IN_8 0x01000000
USB_INTEP_HOST_IN_7 0x00800000
USB_INTEP_HOST_IN_6 0x00400000
USB_INTEP_HOST_IN_5 0x00200000
USB_INTEP_HOST_IN_4 0x00100000
USB_INTEP_HOST_IN_3 0x00080000
USB_INTEP_HOST_IN_2 0x00040000
USB_INTEP_HOST_IN_1 0x00020000
USB_INTEP_DEV_OUT 0xFFFE0000
USB_INTEP_DEV_OUT_15 0x80000000
USB_INTEP_DEV_OUT_14 0x40000000
USB_INTEP_DEV_OUT_13 0x20000000
USB_INTEP_DEV_OUT_12 0x10000000
USB_INTEP_DEV_OUT_11 0x08000000
USB_INTEP_DEV_OUT_10 0x04000000
USB_INTEP_DEV_OUT_9 0x02000000
USB_INTEP_DEV_OUT_8 0x01000000
USB_INTEP_DEV_OUT_7 0x00800000
USB_INTEP_DEV_OUT_6 0x00400000
USB_INTEP_DEV_OUT_5 0x00200000
USB_INTEP_DEV_OUT_4 0x00100000
USB_INTEP_DEV_OUT_3 0x00080000
USB_INTEP_DEV_OUT_2 0x00040000
USB_INTEP_DEV_OUT_1 0x00020000
USB_INTEP_HOST_OUT 0x0000FFFE
USB_INTEP_HOST_OUT_15 0x00008000
USB_INTEP_HOST_OUT_14 0x00004000
USB_INTEP_HOST_OUT_13 0x00002000
USB_INTEP_HOST_OUT_12 0x00001000
USB_INTEP_HOST_OUT_11 0x00000800
USB_INTEP_HOST_OUT_10 0x00000400
USB_INTEP_HOST_OUT_9 0x00000200
USB_INTEP_HOST_OUT_8 0x00000100
USB_INTEP_HOST_OUT_7 0x00000080
USB_INTEP_HOST_OUT_6 0x00000040
USB_INTEP_HOST_OUT_5 0x00000020
USB_INTEP_HOST_OUT_4 0x00000010
USB_INTEP_HOST_OUT_3 0x00000008
USB_INTEP_HOST_OUT_2 0x00000004
USB_INTEP_HOST_OUT_1 0x00000002
USB_INTEP_DEV_IN 0x0000FFFE
USB_INTEP_DEV_IN_15 0x00008000
USB_INTEP_DEV_IN_14 0x00004000
USB_INTEP_DEV_IN_13 0x00002000
USB_INTEP_DEV_IN_12 0x00001000
USB_INTEP_DEV_IN_11 0x00000800
USB_INTEP_DEV_IN_10 0x00000400
USB_INTEP_DEV_IN_9 0x00000200
USB_INTEP_DEV_IN_8 0x00000100
USB_INTEP_DEV_IN_7 0x00000080
USB_INTEP_DEV_IN_6 0x00000040
USB_INTEP_DEV_IN_5 0x00000020
USB_INTEP_DEV_IN_4 0x00000010
USB_INTEP_DEV_IN_3 0x00000008
USB_INTEP_DEV_IN_2 0x00000004
USB_INTEP_DEV_IN_1 0x00000002
USB_INTEP_0 0x00000001
USB_UNDEF_SPEED 0x80000000
USB_FULL_SPEED 0x00000001
USB_LOW_SPEED 0x00000000
USB_HOST_IN_STATUS 0xFFFF0000
USB_HOST_IN_PID_ERROR 0x10000000
USB_HOST_IN_NOT_COMP 0x01000000
USB_HOST_IN_STALL 0x00400000
USB_HOST_IN_DATA_ERROR 0x00080000
USB_HOST_IN_NAK_TO 0x00080000
USB_HOST_IN_ERROR 0x00040000
USB_HOST_IN_FIFO_FULL 0x00020000
USB_HOST_IN_PKTRDY 0x00010000
USB_HOST_OUT_STATUS 0x0000FFFF
USB_HOST_OUT_NAK_TO 0x00000080
USB_HOST_OUT_NOT_COMP 0x00000080
USB_HOST_OUT_STALL 0x00000020
USB_HOST_OUT_ERROR 0x00000004
USB_HOST_OUT_FIFO_NE 0x00000002
USB_HOST_OUT_PKTPEND 0x00000001
USB_HOST_EP0_NAK_TO 0x00000080
USB_HOST_EP0_STATUS 0x00000040
USB_HOST_EP0_ERROR 0x00000010
USB_HOST_EP0_RX_STALL 0x00000004
USB_HOST_EP0_RXPKTRDY 0x00000001
USB_DEV_RX_PID_ERROR 0x01000000
USB_DEV_RX_SENT_STALL 0x00400000
USB_DEV_RX_DATA_ERROR 0x00080000
USB_DEV_RX_OVERRUN 0x00040000
USB_DEV_RX_FIFO_FULL 0x00020000
USB_DEV_RX_PKT_RDY 0x00010000
USB_DEV_TX_NOT_COMP 0x00000080
USB_DEV_TX_SENT_STALL 0x00000020
USB_DEV_TX_UNDERRUN 0x00000004
USB_DEV_TX_FIFO_NE 0x00000002
USB_DEV_TX_TXPKTRDY 0x00000001
USB_DEV_EP0_SETUP_END 0x00000010
USB_DEV_EP0_SENT_STALL 0x00000004
USB_DEV_EP0_IN_PKTPEND 0x00000002
USB_DEV_EP0_OUT_PKTRDY 0x00000001
USB_EP_AUTO_SET 0x00000001
USB_EP_AUTO_REQUEST 0x00000002
USB_EP_AUTO_CLEAR 0x00000004
USB_EP_DMA_MODE_0 0x00000008
USB_EP_DMA_MODE_1 0x00000010
USB_EP_MODE_ISOC 0x00000000
USB_EP_MODE_BULK 0x00000100
USB_EP_MODE_INT 0x00000200
USB_EP_MODE_CTRL 0x00000300
USB_EP_MODE_MASK 0x00000300
USB_EP_SPEED_LOW 0x00000000
USB_EP_SPEED_FULL 0x00001000
USB_EP_HOST_IN 0x00000000
USB_EP_HOST_OUT 0x00002000
USB_EP_DEV_IN 0x00002000
USB_EP_DEV_OUT 0x00000000
USB_HOST_PWRFLT_LOW 0x00000010
USB_HOST_PWRFLT_HIGH 0x00000030
USB_HOST_PWRFLT_EP_NONE 0x00000000
USB_HOST_PWRFLT_EP_TRI 0x00000140
USB_HOST_PWRFLT_EP_LOW 0x00000240
USB_HOST_PWRFLT_EP_HIGH 0x00000340
USB_HOST_PWREN_MAN_LOW 0x00000000
USB_HOST_PWREN_MAN_HIGH 0x00000001
USB_HOST_PWREN_AUTOLOW 0x00000002
USB_HOST_PWREN_AUTOHIGH 0x00000003
USB_HOST_PWREN_FILTER 0x00010000
MAX_PACKET_SIZE_EP0 64
USB_EP_0 0x00000000
USB_EP_1 0x00000010
USB_EP_2 0x00000020
USB_EP_3 0x00000030
USB_EP_4 0x00000040
USB_EP_5 0x00000050
USB_EP_6 0x00000060
USB_EP_7 0x00000070
USB_EP_8 0x00000080
USB_EP_9 0x00000090
USB_EP_10 0x000000A0
USB_EP_11 0x000000B0
USB_EP_12 0x000000C0
USB_EP_13 0x000000D0
USB_EP_14 0x000000E0
USB_EP_15 0x000000F0
NUM_USB_EP 16
IndexToUSBEP(x) (((uint32_t)(x) << 4) & 0xFF)
USBEPToIndex(x) ((x) >> 4)
USB_FIFO_SZ_8 0x00000000
USB_FIFO_SZ_16 0x00000001
USB_FIFO_SZ_32 0x00000002
USB_FIFO_SZ_64 0x00000003
USB_FIFO_SZ_128 0x00000004
USB_FIFO_SZ_256 0x00000005
USB_FIFO_SZ_512 0x00000006
USB_FIFO_SZ_1024 0x00000007
USB_FIFO_SZ_2048 0x00000008
USB_FIFO_SZ_4096 0x00000009
USB_FIFO_SZ_8_DB 0x00000010
USB_FIFO_SZ_16_DB 0x00000011
USB_FIFO_SZ_32_DB 0x00000012
USB_FIFO_SZ_64_DB 0x00000013
USB_FIFO_SZ_128_DB 0x00000014
USB_FIFO_SZ_256_DB 0x00000015
USB_FIFO_SZ_512_DB 0x00000016
USB_FIFO_SZ_1024_DB 0x00000017
USB_FIFO_SZ_2048_DB 0x00000018
USB_FIFO_SIZE_DB_FLAG 0x00000010
USBFIFOSizeToBytes(x) ((uint32_t)8 << (x))
USB_TRANS_OUT 0x00000102
USB_TRANS_IN 0x00000102
USB_TRANS_IN_LAST 0x0000010a
USB_TRANS_SETUP 0x0000110a
USB_TRANS_STATUS 0x00000142
USB_DUAL_MODE_HOST 0x00000001
USB_DUAL_MODE_DEVICE 0x00000081
USB_DUAL_MODE_NONE 0x00000080
USB_OTG_MODE_ASIDE_HOST 0x0000001d
USB_OTG_MODE_ASIDE_NPWR 0x00000001
USB_OTG_MODE_ASIDE_SESS 0x00000009
USB_OTG_MODE_ASIDE_AVAL 0x00000011
USB_OTG_MODE_ASIDE_DEV 0x00000019
USB_OTG_MODE_BSIDE_HOST 0x0000009d
USB_OTG_MODE_BSIDE_DEV 0x00000099
USB_OTG_MODE_BSIDE_NPWR 0x00000081
USB_OTG_MODE_NONE 0x00000080
USB_INT_ALL 0xFF030E0F
USB_INT_STATUS 0xFF000000
USB_INT_VBUS_ERR 0x80000000
USB_INT_SESSION_START 0x40000000
USB_INT_SESSION_END 0x20000000
USB_INT_DISCONNECT 0x20000000
USB_INT_CONNECT 0x10000000
USB_INT_SOF 0x08000000
USB_INT_BABBLE 0x04000000
USB_INT_RESET 0x04000000
USB_INT_RESUME 0x02000000
USB_INT_SUSPEND 0x01000000
USB_INT_MODE_DETECT 0x00020000
USB_INT_POWER_FAULT 0x00010000
USB_INT_HOST_IN 0x00000E00
USB_INT_DEV_OUT 0x00000E00
USB_INT_HOST_IN_EP3 0x00000800
USB_INT_HOST_IN_EP2 0x00000400
USB_INT_HOST_IN_EP1 0x00000200
USB_INT_DEV_OUT_EP3 0x00000800
USB_INT_DEV_OUT_EP2 0x00000400
USB_INT_DEV_OUT_EP1 0x00000200
USB_INT_HOST_OUT 0x0000000E
USB_INT_DEV_IN 0x0000000E
USB_INT_HOST_OUT_EP3 0x00000008
USB_INT_HOST_OUT_EP2 0x00000004
USB_INT_HOST_OUT_EP1 0x00000002
USB_INT_DEV_IN_EP3 0x00000008
USB_INT_DEV_IN_EP2 0x00000004
USB_INT_DEV_IN_EP1 0x00000002
USB_INT_EP0 0x00000001

Functions

uint32_t USBDevAddrGet(uint32_t ui32Base)

Returns the current device address in device mode.

This function returns the current device address. This address was set by a call to

USBDevAddrSet().
Parameters

  • ui32Base: specifies the USB module base address.

Note

This function must only be called in device mode.

Return

The current device address.

void USBDevAddrSet(uint32_t ui32Base, uint32_t ui32Address)

Sets the address in device mode.

This function configures the device address on the USB bus. This address was likely received via a SET ADDRESS command from the host controller.

Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Address: is the address to use for a device.

Note

This function must only be called in device mode.

Return

None.

void USBDevConnect(uint32_t ui32Base)

Connects the USB controller to the bus in device mode.

This function causes the soft connect feature of the USB controller to be enabled. Call

USBDevDisconnect() to remove the USB device from the bus.
Parameters

  • ui32Base: specifies the USB module base address.

Note

This function must only be called in device mode.

Return

None.

void USBDevDisconnect(uint32_t ui32Base)

Removes the USB controller from the bus in device mode.

This function causes the soft connect feature of the USB controller to remove the device from the USB bus. A call to

USBDevConnect() is needed to reconnect to the bus.
Parameters

  • ui32Base: specifies the USB module base address.

Note

This function must only be called in device mode.

Return

None.

void USBDevEndpointConfigSet(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t ui32MaxPacketSize, uint32_t ui32Flags)

Sets the configuration for an endpoint.

This function sets the basic configuration for an endpoint in device mode. Endpoint zero does not have a dynamic configuration, so this function must not be called for endpoint zero. The

ui32Flags parameter determines some of the configuration while the other parameters provide the rest.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

  • ui32MaxPacketSize: is the maximum packet size for this endpoint.

  • ui32Flags: are used to configure other endpoint settings.

The USB_EP_MODE_ flags define what the type is for the given endpoint.

  • USB_EP_MODE_CTRL is a control endpoint.

  • USB_EP_MODE_ISOC is an isochronous endpoint.

  • USB_EP_MODE_BULK is a bulk endpoint.

  • USB_EP_MODE_INT is an interrupt endpoint.

The USB_EP_DMA_MODE_ flags determine the type of DMA access to the endpoint data FIFOs. The choice of the DMA mode depends on how the DMA controller is configured and how it is being used. See the `Using USB with the uDMA Controller’ section for more information on DMA configuration.

When configuring an IN endpoint, the USB_EP_AUTO_SET bit can be specified to cause the automatic transmission of data on the USB bus as soon as ui32MaxPacketSize bytes of data are written into the FIFO for this endpoint. This option is commonly used with DMA as no interaction is required to start the transmission of data.

When configuring an OUT endpoint, the USB_EP_AUTO_REQUEST bit is specified to trigger the request for more data once the FIFO has been drained enough to receive ui32MaxPacketSize more bytes of data. Also for OUT endpoints, the USB_EP_AUTO_CLEAR bit can be used to clear the data packet ready flag automatically once the data has been read from the FIFO. If this option is not used, this flag must be manually cleared via a call to USBDevEndpointStatusClear(). Both of these settings can be used to remove the need for extra calls when using the controller in DMA mode.

Note

This function must only be called in device mode.

Return

None.

void USBDevEndpointConfigGet(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t *pui32MaxPacketSize, uint32_t *pui32Flags)

Gets the current configuration for an endpoint.

This function returns the basic configuration for an endpoint in device mode. The values returned in

*pui32MaxPacketSize and *pui32Flags are equivalent to the ui32MaxPacketSize and ui32Flags previously passed to USBDevEndpointConfigSet() for this endpoint.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

  • pui32MaxPacketSize: is a pointer which is written with the maximum packet size for this endpoint.

  • pui32Flags: is a pointer which is written with the current endpoint settings. On entry to the function, this pointer must contain either USB_EP_DEV_IN or USB_EP_DEV_OUT to indicate whether the IN or OUT endpoint is to be queried.

Note

This function must only be called in device mode.

Return

None.

void USBDevEndpointDataAck(uint32_t ui32Base, uint32_t ui32Endpoint, bool bIsLastPacket)

Acknowledge that data was read from the given endpoint’s FIFO in device mode.

This function acknowledges that the data was read from the endpoint’s FIFO. The

bIsLastPacket parameter is set to a true value if this is the last in a series of data packets on endpoint zero. The bIsLastPacket parameter is not used for endpoints other than endpoint zero. This call can be used if processing is required between reading the data and acknowledging that the data has been read.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

  • bIsLastPacket: indicates if this packet is the last one.

Note

This function must only be called in device mode.

Return

None.

void USBDevEndpointStall(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t ui32Flags)

Stalls the specified endpoint in device mode.

This function causes the endpoint number passed in to go into a stall condition. If the

ui32Flags parameter is USB_EP_DEV_IN, then the stall is issued on the IN portion of this endpoint. If the ui32Flags parameter is USB_EP_DEV_OUT, then the stall is issued on the OUT portion of this endpoint.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: specifies the endpoint to stall.

  • ui32Flags: specifies whether to stall the IN or OUT endpoint.

Note

This function must only be called in device mode.

Return

None.

void USBDevEndpointStallClear(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t ui32Flags)

Clears the stall condition on the specified endpoint in device mode.

This function causes the endpoint number passed in to exit the stall condition. If the

ui32Flags parameter is USB_EP_DEV_IN, then the stall is cleared on the IN portion of this endpoint. If the ui32Flags parameter is USB_EP_DEV_OUT, then the stall is cleared on the OUT portion of this endpoint.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: specifies which endpoint to remove the stall condition.

  • ui32Flags: specifies whether to remove the stall condition from the IN or the OUT portion of this endpoint.

Note

This function must only be called in device mode.

Return

None.

void USBDevEndpointStatusClear(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t ui32Flags)

Clears the status bits in this endpoint in device mode.

This function clears the status of any bits that are passed in the

ui32Flags parameter. The ui32Flags parameter can take the value returned from the USBEndpointStatus() call.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

  • ui32Flags: are the status bits that are cleared.

Note

This function must only be called in device mode.

Return

None.

uint32_t USBEndpointDataAvail(uint32_t ui32Base, uint32_t ui32Endpoint)

Determine the number of bytes of data available in a given endpoint’s FIFO.

This function returns the number of bytes of data currently available in the FIFO for the given receive (OUT) endpoint. It may be used prior to calling

USBEndpointDataGet() to determine the size of buffer required to hold the newly-received packet.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

Return

This call returns the number of bytes available in a given endpoint FIFO.

void USBEndpointDMAEnable(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t ui32Flags)

Enable DMA on a given endpoint.

This function enables DMA on a given endpoint and configures the mode according to the values in the

ui32Flags parameter. The ui32Flags parameter must have USB_EP_DEV_IN or USB_EP_DEV_OUT set. Once this function is called the only DMA or error interrupts are generated by the USB controller.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

  • ui32Flags: specifies which direction and what mode to use when enabling DMA.

Note

If this function is called when an endpoint is configured in DMA mode 0 the USB controller does not generate an interrupt.

Return

None.

void USBEndpointDMADisable(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t ui32Flags)

Disable DMA on a given endpoint.

This function disables DMA on a given endpoint to allow non-DMA USB transactions to generate interrupts normally. The

ui32Flags parameter must be USB_EP_DEV_IN or USB_EP_DEV_OUT; all other bits are ignored.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

  • ui32Flags: specifies which direction to disable.

Return

None.

void USBEndpointDMAConfigSet(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t ui32Config)

Configure the DMA settings for an endpoint.

This function configures the DMA settings for a given endpoint without changing other options that may already be configured. In order for the DMA transfer to be enabled, the

USBEndpointDMAEnable() function must be called before starting the DMA transfer. The configuration options are passed in the ui32Config parameter and can have the values described below.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

  • ui32Config: specifies the configuration options for an endpoint.

One of the following values to specify direction:

  • USB_EP_HOST_OUT or USB_EP_DEV_IN - This setting is used with DMA transfers from memory to the USB controller.

  • USB_EP_HOST_IN or USB_EP_DEV_OUT - This setting is used with DMA transfers from the USB controller to memory.

One of the following values:

  • USB_EP_DMA_MODE_0(default) - This setting is typically used for transfers that do not span multiple packets or when interrupts are required for each packet.

  • USB_EP_DMA_MODE_1 - This setting is typically used for transfers that span multiple packets and do not require interrupts between packets.

Values only used with USB_EP_HOST_OUT or USB_EP_DEV_IN:

  • USB_EP_AUTO_SET - This setting is used to allow transmit DMA transfers to automatically be sent when a full packet is loaded into a FIFO. This is needed with USB_EP_DMA_MODE_1 to ensure that packets go out when the FIFO becomes full and the DMA has more data to send.

Values only used with USB_EP_HOST_IN or USB_EP_DEV_OUT:

  • USB_EP_AUTO_CLEAR - This setting is used to allow receive DMA transfers to automatically be acknowledged as they are received. This is needed with USB_EP_DMA_MODE_1 to ensure that packets continue to be received and acknowledged when the FIFO is emptied by the DMA transfer.

Values only used with USB_EP_HOST_IN:

  • USB_EP_AUTO_REQUEST - This setting is used to allow receive DMA transfers to automatically request a new IN transaction when the previous transfer has emptied the FIFO. This is typically used in conjunction with USB_EP_AUTO_CLEAR so that receive DMA transfers can continue without interrupting the main processor.

Example: Set endpoint 1 receive endpoint to automatically acknowledge request and automatically generate a new IN request in host mode.

//! //
//! // Configure endpoint 1 for receiving multiple packets using DMA.
//! //
//! USBEndpointDMAConfigSet(USBA_BASE, USB_EP_1, USB_EP_HOST_IN |
//!                                              USB_EP_DMA_MODE_1 |
//!                                              USB_EP_AUTO_CLEAR |
//!                                              USB_EP_AUTO_REQUEST);
//!

\b Example: Set endpoint 2 transmit endpoint to automatically send each
packet in host mode when spanning multiple packets.

\verbatim
//! // //! // Configure endpoint 1 for transmitting multiple packets using DMA. //! // //! USBEndpointDMAConfigSet(USBA_BASE, USB_EP_2, USB_EP_HOST_OUT | //! USB_EP_DMA_MODE_1 | //! USB_EP_AUTO_SET); //! 
\return None.

int32_t USBEndpointDataGet(uint32_t ui32Base, uint32_t ui32Endpoint, uint8_t *pui8Data, uint32_t *pui32Size)

Retrieves data from the given endpoint’s FIFO.

This function returns the data from the FIFO for the given endpoint. The

pui32Size parameter indicates the size of the buffer passed in the pui32Data parameter. The data in the pui32Size parameter is changed to match the amount of data returned in the pui8Data parameter. If a zero-byte packet is received, this call does not return an error but instead just returns a zero in the pui32Size parameter. The only error case occurs when there is no data packet available.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

  • pui8Data: is a pointer to the data area used to return the data from the FIFO.

  • pui32Size: is initially the size of the buffer passed into this call via the pui8Data parameter. It is set to the amount of data returned in the buffer.

Return

This call returns 0, or -1 if no packet was received.

int32_t USBEndpointDataPut(uint32_t ui32Base, uint32_t ui32Endpoint, uint8_t *pui8Data, uint32_t ui32Size)

Puts data into the given endpoint’s FIFO.

This function puts the data from the

pui8Data parameter into the FIFO for this endpoint. If a packet is already pending for transmission, then this call does not put any of the data into the FIFO and returns -1. Care must be taken to not write more data than can fit into the FIFO allocated by the call to USBFIFOConfigSet().
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

  • pui8Data: is a pointer to the data area used as the source for the data to put into the FIFO.

  • ui32Size: is the amount of data to put into the FIFO.

Return

This call returns 0 on success, or -1 to indicate that the FIFO is in use and cannot be written.

int32_t USBEndpointDataSend(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t ui32TransType)

Starts the transfer of data from an endpoint’s FIFO.

This function starts the transfer of data from the FIFO for a given endpoint. This function is called if the

USB_EP_AUTO_SET bit was not enabled for the endpoint. Setting the ui32TransType parameter allows the appropriate signaling on the USB bus for the type of transaction being requested. The ui32TransType parameter must be one of the following:
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

  • ui32TransType: is set to indicate what type of data is being sent.

  • USB_TRANS_OUT for OUT transaction on any endpoint in host mode.

  • USB_TRANS_IN for IN transaction on any endpoint in device mode.

  • USB_TRANS_IN_LAST for the last IN transaction on endpoint zero in a sequence of IN transactions.

  • USB_TRANS_SETUP for setup transactions on endpoint zero.

  • USB_TRANS_STATUS for status results on endpoint zero.

Return

This call returns 0 on success, or -1 if a transmission is already in progress.

void USBEndpointDataToggleClear(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t ui32Flags)

Sets the data toggle on an endpoint to zero.

This function causes the USB controller to clear the data toggle for an endpoint. This call is not valid for endpoint zero and can be made with host or device controllers.

Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: specifies the endpoint to reset the data toggle.

  • ui32Flags: specifies whether to access the IN or OUT endpoint.

The ui32Flags parameter must be one of USB_EP_HOST_OUT, USB_EP_HOST_IN, USB_EP_DEV_OUT, or USB_EP_DEV_IN.

Return

None.

void USBEndpointPacketCountSet(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t ui32Count)

Sets the number of packets to request when transferring multiple bulk packets.

This function sets the number of consecutive bulk packets to request when transferring multiple bulk packets with DMA.

Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint index to target for this write.

  • ui32Count: is the number of packets to request.

Note

This feature is not available on all Tiva devices. Please check the data sheet to determine if the USB controller has a DMA controller or if it must use the uDMA controller for DMA transfers.

Return

None.

uint32_t USBEndpointStatus(uint32_t ui32Base, uint32_t ui32Endpoint)

Returns the current status of an endpoint.

This function returns the status of a given endpoint. If any of these status bits must be cleared, then the

USBDevEndpointStatusClear() or the USBHostEndpointStatusClear() functions must be called.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

The following are the status flags for host mode:

  • USB_HOST_IN_PID_ERROR - PID error on the given endpoint.

  • USB_HOST_IN_NOT_COMP - The device failed to respond to an IN request.

  • USB_HOST_IN_STALL - A stall was received on an IN endpoint.

  • USB_HOST_IN_DATA_ERROR - There was a CRC or bit-stuff error on an IN endpoint in Isochronous mode.

  • USB_HOST_IN_NAK_TO - NAKs received on this IN endpoint for more than the specified timeout period.

  • USB_HOST_IN_ERROR - Failed to communicate with a device using this IN endpoint.

  • USB_HOST_IN_FIFO_FULL - This IN endpoint’s FIFO is full.

  • USB_HOST_IN_PKTRDY - Data packet ready on this IN endpoint.

  • USB_HOST_OUT_NAK_TO - NAKs received on this OUT endpoint for more than the specified timeout period.

  • USB_HOST_OUT_NOT_COMP - The device failed to respond to an OUT request.

  • USB_HOST_OUT_STALL - A stall was received on this OUT endpoint.

  • USB_HOST_OUT_ERROR - Failed to communicate with a device using this OUT endpoint.

  • USB_HOST_OUT_FIFO_NE - This endpoint’s OUT FIFO is not empty.

  • USB_HOST_OUT_PKTPEND - The data transfer on this OUT endpoint has not completed.

  • USB_HOST_EP0_NAK_TO - NAKs received on endpoint zero for more than the specified timeout period.

  • USB_HOST_EP0_ERROR - The device failed to respond to a request on endpoint zero.

  • USB_HOST_EP0_IN_STALL - A stall was received on endpoint zero for an IN transaction.

  • USB_HOST_EP0_IN_PKTRDY - Data packet ready on endpoint zero for an IN transaction.

The following are the status flags for device mode:

  • USB_DEV_OUT_SENT_STALL - A stall was sent on this OUT endpoint.

  • USB_DEV_OUT_DATA_ERROR - There was a CRC or bit-stuff error on an OUT endpoint.

  • USB_DEV_OUT_OVERRUN - An OUT packet was not loaded due to a full FIFO.

  • USB_DEV_OUT_FIFO_FULL - The OUT endpoint’s FIFO is full.

  • USB_DEV_OUT_PKTRDY - There is a data packet ready in the OUT endpoint’s FIFO.

  • USB_DEV_IN_NOT_COMP - A larger packet was split up, more data to come.

  • USB_DEV_IN_SENT_STALL - A stall was sent on this IN endpoint.

  • USB_DEV_IN_UNDERRUN - Data was requested on the IN endpoint and no data was ready.

  • USB_DEV_IN_FIFO_NE - The IN endpoint’s FIFO is not empty.

  • USB_DEV_IN_PKTPEND - The data transfer on this IN endpoint has not completed.

  • USB_DEV_EP0_SETUP_END - A control transaction ended before Data End condition was sent.

  • USB_DEV_EP0_SENT_STALL - A stall was sent on endpoint zero.

  • USB_DEV_EP0_IN_PKTPEND - The data transfer on endpoint zero has not completed.

  • USB_DEV_EP0_OUT_PKTRDY - There is a data packet ready in endpoint zero’s OUT FIFO.

Return

The current status flags for the endpoint depending on mode.

uint32_t USBFIFOAddrGet(uint32_t ui32Base, uint32_t ui32Endpoint)

Returns the absolute FIFO address for a given endpoint.

This function returns the actual physical address of the FIFO. This address is needed when the USB is going to be used with the uDMA controller and the source or destination address must be set to the physical FIFO address for a given endpoint.

Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: specifies which endpoint’s FIFO address to return.

Return

None.

void USBFIFOConfigGet(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t *pui32FIFOAddress, uint32_t *pui32FIFOSize, uint32_t ui32Flags)

Returns the FIFO configuration for an endpoint.

This function returns the starting address and size of the FIFO for a given endpoint. Endpoint zero does not have a dynamically configurable FIFO, so this function must not be called for endpoint zero. The

ui32Flags parameter specifies whether the endpoint’s OUT or IN FIFO must be read. If in host mode, the ui32Flags parameter must be USB_EP_HOST_OUT or USB_EP_HOST_IN, and if in device mode, the ui32Flags parameter must be either USB_EP_DEV_OUT or USB_EP_DEV_IN.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

  • pui32FIFOAddress: is the starting address for the FIFO.

  • pui32FIFOSize: is the size of the FIFO as specified by one of the USB_FIFO_SZ_ values.

  • ui32Flags: specifies what information to retrieve from the FIFO configuration.

Return

None.

void USBFIFOConfigSet(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t ui32FIFOAddress, uint32_t ui32FIFOSize, uint32_t ui32Flags)

Sets the FIFO configuration for an endpoint.

This function configures the starting FIFO RAM address and size of the FIFO for a given endpoint. Endpoint zero does not have a dynamically configurable FIFO, so this function must not be called for endpoint zero. The

ui32FIFOSize parameter must be one of the values in the USB_FIFO_SZ_ values.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

  • ui32FIFOAddress: is the starting address for the FIFO.

  • ui32FIFOSize: is the size of the FIFO specified by one of the USB_FIFO_SZ_ values.

  • ui32Flags: specifies what information to set in the FIFO configuration.

The ui32FIFOAddress value must be a multiple of 8 bytes and directly indicates the starting address in the USB controller’s FIFO RAM. For example, a value of 64 indicates that the FIFO starts 64 bytes into the USB controller’s FIFO memory. The ui32Flags value specifies whether the endpoint’s OUT or IN FIFO must be configured. If in host mode, use USB_EP_HOST_OUT or USB_EP_HOST_IN, and if in device mode, use USB_EP_DEV_OUT or USB_EP_DEV_IN.

Return

None.

void USBFIFOFlush(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t ui32Flags)

Forces a flush of an endpoint’s FIFO.

This function forces the USB controller to flush out the data in the FIFO. The function can be called with either host or device controllers and requires the

ui32Flags parameter be one of USB_EP_HOST_OUT, USB_EP_HOST_IN, USB_EP_DEV_OUT, or USB_EP_DEV_IN.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

  • ui32Flags: specifies if the IN or OUT endpoint is accessed.

Return

None.

uint32_t USBFrameNumberGet(uint32_t ui32Base)

Get the current frame number.

This function returns the last frame number received.

Parameters

  • ui32Base: specifies the USB module base address.

Return

The last frame number received.

uint32_t USBHostAddrGet(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t ui32Flags)

Gets the current functional device address for an endpoint.

This function returns the current functional address that an endpoint is using to communicate with a device. The

ui32Flags parameter determines if the IN or OUT endpoint’s device address is returned.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

  • ui32Flags: determines if this is an IN or an OUT endpoint.

Note

This function must only be called in host mode.

Return

Returns the current function address being used by an endpoint.

void USBHostAddrSet(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t ui32Addr, uint32_t ui32Flags)

Sets the functional address for the device that is connected to an endpoint in host mode.

This function configures the functional address for a device that is using this endpoint for communication. This

ui32Addr parameter is the address of the target device that this endpoint is communicating with. The ui32Flags parameter indicates if the IN or OUT endpoint is set.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

  • ui32Addr: is the functional address for the controller to use for this endpoint.

  • ui32Flags: determines if this is an IN or an OUT endpoint.

Note

This function must only be called in host mode.

Return

None.

void USBHostEndpointConfig(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t ui32MaxPacketSize, uint32_t ui32NAKPollInterval, uint32_t ui32TargetEndpoint, uint32_t ui32Flags)

Sets the base configuration for a host endpoint.

This function sets the basic configuration for the transmit or receive portion of an endpoint in host mode. The

ui32Flags parameter determines some of the configuration while the other parameters provide the rest. The ui32Flags parameter determines whether this is an IN endpoint (USB_EP_HOST_IN or USB_EP_DEV_IN) or an OUT endpoint (USB_EP_HOST_OUT or USB_EP_DEV_OUT), whether this is a Full speed endpoint (USB_EP_SPEED_FULL) or a Low speed endpoint (USB_EP_SPEED_LOW).
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

  • ui32MaxPayload: is the maximum payload for this endpoint.

  • ui32NAKPollInterval: is the either the NAK timeout limit or the polling interval, depending on the type of endpoint.

  • ui32TargetEndpoint: is the endpoint that the host endpoint is targeting.

  • ui32Flags: are used to configure other endpoint settings.

The USB_EP_MODE_ flags control the type of the endpoint.

  • USB_EP_MODE_CTRL is a control endpoint.

  • USB_EP_MODE_ISOC is an isochronous endpoint.

  • USB_EP_MODE_BULK is a bulk endpoint.

  • USB_EP_MODE_INT is an interrupt endpoint.

The ui32NAKPollInterval parameter has different meanings based on the USB_EP_MODE value and whether or not this call is being made for endpoint zero or another endpoint. For endpoint zero or any Bulk endpoints, this value always indicates the number of frames to allow a device to NAK before considering it a timeout. If this endpoint is an isochronous or interrupt endpoint, this value is the polling interval for this endpoint.

For interrupt endpoints, the polling interval is the number of frames between interrupt IN requests to an endpoint and has a range of 1 to 255. For isochronous endpoints this value represents a polling interval of 2 ^ (ui32NAKPollInterval - 1) frames. When used as a NAK timeout, the ui32NAKPollInterval value specifies 2 ^ (ui32NAKPollInterval - 1) frames before issuing a time out.

The USB_EP_DMA_MODE_ flags enable the type of DMA used to access the endpoint’s data FIFOs. The choice of the DMA mode depends on how the DMA controller is configured and how it is being used. See the `Using USB with the uDMA Controller’ section for more information on DMA configuration.

When configuring the OUT portion of an endpoint, the USB_EP_AUTO_SET bit is specified to cause the transmission of data on the USB bus to start as soon as the number of bytes specified by ui32MaxPayload has been written into the OUT FIFO for this endpoint.

When configuring the IN portion of an endpoint, the USB_EP_AUTO_REQUEST bit can be specified to trigger the request for more data once the FIFO has been drained enough to fit ui32MaxPayload bytes. The USB_EP_AUTO_CLEAR bit can be used to clear the data packet ready flag automatically once the data has been read from the FIFO. If this option is not used, this flag must be manually cleared via a call to USBDevEndpointStatusClear() or USBHostEndpointStatusClear().

Note

This function must only be called in host mode.

Return

None.

void USBHostEndpointDataAck(uint32_t ui32Base, uint32_t ui32Endpoint)

Acknowledge that data was read from the given endpoint’s FIFO in host mode.

This function acknowledges that the data was read from the endpoint’s FIFO. This call is used if processing is required between reading the data and acknowledging that the data has been read.

Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

Note

This function must only be called in host mode.

Return

None.

void USBHostEndpointDataToggle(uint32_t ui32Base, uint32_t ui32Endpoint, bool bDataToggle, uint32_t ui32Flags)

Sets the value data toggle on an endpoint in host mode.

This function is used to force the state of the data toggle in host mode. If the value passed in the

bDataToggle parameter is false, then the data toggle is set to the DATA0 state, and if it is true it is set to the DATA1 state. The ui32Flags parameter can be USB_EP_HOST_IN or USB_EP_HOST_OUT to access the desired portion of this endpoint. The ui32Flags parameter is ignored for endpoint zero.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: specifies the endpoint to reset the data toggle.

  • bDataToggle: specifies whether to set the state to DATA0 or DATA1.

  • ui32Flags: specifies whether to set the IN or OUT endpoint.

Note

This function must only be called in host mode.

Return

None.

void USBHostEndpointStatusClear(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t ui32Flags)

Clears the status bits in this endpoint in host mode.

This function clears the status of any bits that are passed in the

ui32Flags parameter. The ui32Flags parameter can take the value returned from the USBEndpointStatus() call.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

  • ui32Flags: are the status bits that are cleared.

Note

This function must only be called in host mode.

Return

None.

uint32_t USBHostHubAddrGet(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t ui32Flags)

Gets the current device hub address for this endpoint.

This function returns the current hub address that an endpoint is using to communicate with a device. The

ui32Flags parameter determines if the device address for the IN or OUT endpoint is returned.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

  • ui32Flags: determines if this is an IN or an OUT endpoint.

Note

This function must only be called in host mode.

Return

This function returns the current hub address being used by an endpoint.

void USBHostHubAddrSet(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t ui32Addr, uint32_t ui32Flags)

Sets the hub address for the device that is connected to an endpoint.

This function configures the hub address for a device that is using this endpoint for communication. The

ui32Flags parameter determines if the device address for the IN or the OUT endpoint is configured by this call and sets the speed of the downstream device. Valid values are one of USB_EP_HOST_OUT or USB_EP_HOST_IN optionally ORed with USB_EP_SPEED_LOW.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

  • ui32Addr: is the hub address and port for the device using this endpoint. The hub address must be defined in bits 0 through 6 with the port number in bits 8 through 14.

  • ui32Flags: determines if this is an IN or an OUT endpoint.

Note

This function must only be called in host mode.

Return

None.

void USBHostPwrDisable(uint32_t ui32Base)

Disables the external power pin.

This function disables the USBnEPEN signal, which disables an external power supply in host mode operation.

Parameters

  • ui32Base: specifies the USB module base address.

Note

This function must only be called in host mode.

Return

None.

void USBHostPwrEnable(uint32_t ui32Base)

Enables the external power pin.

This function enables the USBnEPEN signal, which enables an external power supply in host mode operation.

Parameters

  • ui32Base: specifies the USB module base address.

Note

This function must only be called in host mode.

Return

None.

void USBHostPwrConfig(uint32_t ui32Base, uint32_t ui32Flags)

Sets the configuration for USB power fault.

This function controls how the USB controller uses its external power control pins (USBnPFLT and USBnEPEN). The flags specify the power fault level sensitivity, the power fault action, and the power enable level and source.

Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Flags: specifies the configuration of the power fault.

One of the following can be selected as the power fault level sensitivity:

  • USB_HOST_PWRFLT_LOW - An external power fault is indicated by the pin being driven low.

  • USB_HOST_PWRFLT_HIGH - An external power fault is indicated by the pin being driven high.

One of the following can be selected as the power fault action:

  • USB_HOST_PWRFLT_EP_NONE - No automatic action when power fault detected.

  • USB_HOST_PWRFLT_EP_TRI - Automatically tri-state the USBnEPEN pin on a power fault.

  • USB_HOST_PWRFLT_EP_LOW - Automatically drive USBnEPEN pin low on a power fault.

  • USB_HOST_PWRFLT_EP_HIGH - Automatically drive USBnEPEN pin high on a power fault.

One of the following can be selected as the power enable level and source:

  • USB_HOST_PWREN_MAN_LOW - USBnEPEN is driven low by the USB controller when USBHostPwrEnable() is called.

  • USB_HOST_PWREN_MAN_HIGH - USBnEPEN is driven high by the USB controller when USBHostPwrEnable() is called.

  • USB_HOST_PWREN_AUTOLOW - USBnEPEN is driven low by the USB controller automatically if USBOTGSessionRequest() has enabled a session.

  • USB_HOST_PWREN_AUTOHIGH - USBnEPEN is driven high by the USB controller automatically if USBOTGSessionRequest() has enabled a session.

On devices that support the VBUS glitch filter, the USB_HOST_PWREN_FILTER can be added to ignore small, short drops in VBUS level caused by high power consumption. This feature is mainly used to avoid causing VBUS errors caused by devices with high in-rush current.

Note

This function must only be called on microcontrollers that support host mode or OTG operation.

Return

None.

void USBHostPwrFaultDisable(uint32_t ui32Base)

Disables power fault detection.

This function disables power fault detection in the USB controller.

Parameters

  • ui32Base: specifies the USB module base address.

Note

This function must only be called in host mode.

Return

None.

void USBHostPwrFaultEnable(uint32_t ui32Base)

Enables power fault detection.

This function enables power fault detection in the USB controller. If the USBnPFLT pin is not in use, this function must not be used.

Parameters

  • ui32Base: specifies the USB module base address.

Note

This function must only be called in host mode.

Return

None.

void USBHostRequestIN(uint32_t ui32Base, uint32_t ui32Endpoint)

Schedules a request for an IN transaction on an endpoint in host mode.

This function schedules a request for an IN transaction. When the USB device being communicated with responds with the data, the data can be retrieved by calling

USBEndpointDataGet() or via a DMA transfer.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

Note

This function must only be called in host mode and only for IN endpoints.

Return

None.

void USBHostRequestINClear(uint32_t ui32Base, uint32_t ui32Endpoint)

Clears a scheduled IN transaction for an endpoint in host mode.

This function clears a previously scheduled IN transaction if it is still pending. This function is used to safely disable any scheduled IN transactions if the endpoint specified by

ui32Endpoint is reconfigured for communications with other devices.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: is the endpoint to access.

Note

This function must only be called in host mode and only for IN endpoints.

Return

None.

void USBHostRequestStatus(uint32_t ui32Base)

Issues a request for a status IN transaction on endpoint zero.

This function is used to cause a request for a status IN transaction from a device on endpoint zero. This function can only be used with endpoint zero as that is the only control endpoint that supports this ability. This function is used to complete the last phase of a control transaction to a device and an interrupt is signaled when the status packet has been received.

Parameters

  • ui32Base: specifies the USB module base address.

Return

None.

void USBHostReset(uint32_t ui32Base, bool bStart)

Handles the USB bus reset condition.

When this function is called with the

bStart parameter set to true, this function causes the start of a reset condition on the USB bus. The caller must then delay at least 20ms before calling this function again with the bStart parameter set to false.
Parameters

  • ui32Base: specifies the USB module base address.

  • bStart: specifies whether to start or stop signaling reset on the USB bus.

Note

This function must only be called in host mode.

Return

None.

void USBHostResume(uint32_t ui32Base, bool bStart)

Handles the USB bus resume condition.

When in device mode, this function brings the USB controller out of the suspend state. This call must first be made with the

bStart parameter set to true to start resume signaling. The device application must then delay at least 10ms but not more than 15ms before calling this function with the bStart parameter set to false.
Parameters

  • ui32Base: specifies the USB module base address.

  • bStart: specifies if the USB controller is entering or leaving the resume signaling state.

When in host mode, this function signals devices to leave the suspend state. This call must first be made with the bStart parameter set to true to start resume signaling. The host application must then delay at least 20ms before calling this function with the bStart parameter set to false. This action causes the controller to complete the resume signaling on the USB bus.

Return

None.

uint32_t USBHostSpeedGet(uint32_t ui32Base)

Returns the current speed of the USB device connected.

This function returns the current speed of the USB bus in host mode.

Parameters

  • ui32Base: specifies the USB module base address.

Example: Get the USB connection speed.

//! //
//! // Get the connection speed of the device connected to the USB controller.
//! //
//! USBHostSpeedGet(USBA_BASE);
//!

\note This function must only be called in host mode.

\return Returns one of the following: \b USB_LOW_SPEED, \b USB_FULL_SPEED,
or \b USB_UNDEF_SPEED.

void USBHostSuspend(uint32_t ui32Base)

Puts the USB bus in a suspended state.

When used in host mode, this function puts the USB bus in the suspended state.

Parameters

  • ui32Base: specifies the USB module base address.

Note

This function must only be called in host mode.

Return

None.

void USBIntDisableControl(uint32_t ui32Base, uint32_t ui32IntFlags)

Disables control interrupts on a given USB controller.

This function disables the control interrupts for the USB controller specified by the

ui32Base parameter. The ui32Flags parameter specifies which control interrupts to disable. The flags passed in the ui32Flags parameters must be the definitions that start with USB_INTCTRL_* and not any other USB_INT flags.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Flags: specifies which control interrupts to disable.

Return

None.

void USBIntEnableControl(uint32_t ui32Base, uint32_t ui32IntFlags)

Enables control interrupts on a given USB controller.

This function enables the control interrupts for the USB controller specified by the

ui32Base parameter. The ui32Flags parameter specifies which control interrupts to enable. The flags passed in the ui32Flags parameters must be the definitions that start with USB_INTCTRL_* and not any other USB_INT flags.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Flags: specifies which control interrupts to enable.

Return

None.

uint32_t USBIntStatus(uint32_t ui32Base, uint32_t *ui32IntStatusEP)

Returns the control interrupt status on a given USB controller.

This function reads control interrupt status for a USB controller. This call returns the current status for control interrupts only, the endpoint interrupt status is retrieved by calling

USBIntStatusEndpoint(). The bit values returned are compared against the USB_INTCTRL_* values.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32IntStatusEP: is a pointer to the variable which holds the endpoint interrupt status from RXIS And TXIS.

The following are the meanings of all USB_INCTRL_ flags and the modes for which they are valid. These values apply to any calls to USBIntStatusControl(), USBIntEnableControl(), and USBIntDisableControl(). Some of these flags are only valid in the following modes as indicated in the parentheses: Host, Device, and OTG.

  • USB_INTCTRL_ALL - A full mask of all control interrupt sources.

  • USB_INTCTRL_VBUS_ERR - A VBUS error has occurred (Host Only).

  • USB_INTCTRL_SESSION - Session Start Detected on A-side of cable (OTG Only).

  • USB_INTCTRL_SESSION_END - Session End Detected (Device Only)

  • USB_INTCTRL_DISCONNECT - Device Disconnect Detected (Host Only)

  • USB_INTCTRL_CONNECT - Device Connect Detected (Host Only)

  • USB_INTCTRL_SOF - Start of Frame Detected.

  • USB_INTCTRL_BABBLE - USB controller detected a device signaling past the end of a frame (Host Only)

  • USB_INTCTRL_RESET - Reset signaling detected by device (Device Only)

  • USB_INTCTRL_RESUME - Resume signaling detected.

  • USB_INTCTRL_SUSPEND - Suspend signaling detected by device (Device Only)

  • USB_INTCTRL_MODE_DETECT - OTG cable mode detection has completed (OTG Only)

  • USB_INTCTRL_POWER_FAULT - Power Fault detected (Host Only)

Note

This call clears the source of all of the control status interrupts.

Return

Returns the status of the control interrupts for a USB controller. This is the value of USBIS.

uint32_t USBIntStatusControl(uint32_t ui32Base)

Returns the control interrupt status on a given USB controller.

This function reads control interrupt status for a USB controller. This call returns the current status for control interrupts only, the endpoint interrupt status is retrieved by calling

USBIntStatusEndpoint(). The bit values returned are compared against the USB_INTCTRL_* values.
Parameters

  • ui32Base: specifies the USB module base address.

The following are the meanings of all USB_INCTRL_ flags and the modes for which they are valid. These values apply to any calls to USBIntStatusControl(), USBIntEnableControl(), and USBIntDisableControl(). Some of these flags are only valid in the following modes as indicated in the parentheses: Host, Device, and OTG.

  • USB_INTCTRL_ALL - A full mask of all control interrupt sources.

  • USB_INTCTRL_VBUS_ERR - A VBUS error has occurred (Host Only).

  • USB_INTCTRL_SESSION - Session Start Detected on A-side of cable (OTG Only).

  • USB_INTCTRL_SESSION_END - Session End Detected (Device Only)

  • USB_INTCTRL_DISCONNECT - Device Disconnect Detected (Host Only)

  • USB_INTCTRL_CONNECT - Device Connect Detected (Host Only)

  • USB_INTCTRL_SOF - Start of Frame Detected.

  • USB_INTCTRL_BABBLE - USB controller detected a device signaling past the end of a frame (Host Only)

  • USB_INTCTRL_RESET - Reset signaling detected by device (Device Only)

  • USB_INTCTRL_RESUME - Resume signaling detected.

  • USB_INTCTRL_SUSPEND - Suspend signaling detected by device (Device Only)

  • USB_INTCTRL_MODE_DETECT - OTG cable mode detection has completed (OTG Only)

  • USB_INTCTRL_POWER_FAULT - Power Fault detected (Host Only)

Note

This call clears the source of all of the control status interrupts.

Return

Returns the status of the control interrupts for a USB controller.

void USBIntDisableEndpoint(uint32_t ui32Base, uint32_t ui32IntFlags)

Disables endpoint interrupts on a given USB controller.

This function disables endpoint interrupts for the USB controller specified by the

ui32Base parameter. The ui32Flags parameter specifies which endpoint interrupts to disable. The flags passed in the ui32Flags parameters must be the definitions that start with USB_INTEP_* and not any other USB_INT flags.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Flags: specifies which endpoint interrupts to disable.

Return

None.

void USBIntEnableEndpoint(uint32_t ui32Base, uint32_t ui32IntFlags)

Enables endpoint interrupts on a given USB controller.

This function enables endpoint interrupts for the USB controller specified by the

ui32Base parameter. The ui32Flags parameter specifies which endpoint interrupts to enable. The flags passed in the ui32Flags parameters must be the definitions that start with USB_INTEP_* and not any other USB_INT flags.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Flags: specifies which endpoint interrupts to enable.

Return

None.

uint32_t USBIntStatusEndpoint(uint32_t ui32Base)

Returns the endpoint interrupt status on a given USB controller.

This function reads endpoint interrupt status for a USB controller. This call returns the current status for endpoint interrupts only, the control interrupt status is retrieved by calling

USBIntStatusControl(). The bit values returned are compared against the USB_INTEP_* values. These values are grouped into classes for USB_INTEP_HOST_* and USB_INTEP_DEV_* values to handle both host and device modes with all endpoints.
Parameters

  • ui32Base: specifies the USB module base address.

Note

This call clears the source of all of the endpoint interrupts.

Return

Returns the status of the endpoint interrupts for a USB controller.

void USBOTGSessionRequest(uint32_t ui32Base, bool bStart)

Starts or ends a session.

This function is used in OTG mode to start a session request or end a session. If the

bStart parameter is set to true, then this function starts a session and if it is false it ends a session.
Parameters

  • ui32Base: specifies the USB module base address.

  • bStart: specifies if this call starts or ends a session.

Return

None.

uint32_t USBModeGet(uint32_t ui32Base)

Returns the current operating mode of the controller.

This function returns the current operating mode on USB controllers with OTG or Dual mode functionality.

Parameters

  • ui32Base: specifies the USB module base address.

For OTG controllers:

The function returns one of the following values on OTG controllers: USB_OTG_MODE_ASIDE_HOST, USB_OTG_MODE_ASIDE_DEV, USB_OTG_MODE_BSIDE_HOST, USB_OTG_MODE_BSIDE_DEV, USB_OTG_MODE_NONE.

USB_OTG_MODE_ASIDE_HOST indicates that the controller is in host mode on the A-side of the cable.

USB_OTG_MODE_ASIDE_DEV indicates that the controller is in device mode on the A-side of the cable.

USB_OTG_MODE_BSIDE_HOST indicates that the controller is in host mode on the B-side of the cable.

USB_OTG_MODE_BSIDE_DEV indicates that the controller is in device mode on the B-side of the cable. If an OTG session request is started with no cable in place, this mode is the default.

USB_OTG_MODE_NONE indicates that the controller is not attempting to determine its role in the system.

For Dual Mode controllers:

The function returns one of the following values: USB_DUAL_MODE_HOST, USB_DUAL_MODE_DEVICE, or USB_DUAL_MODE_NONE.

USB_DUAL_MODE_HOST indicates that the controller is acting as a host.

USB_DUAL_MODE_DEVICE indicates that the controller acting as a device.

USB_DUAL_MODE_NONE indicates that the controller is not active as either a host or device.

Return

Returns USB_OTG_MODE_ASIDE_HOST, USB_OTG_MODE_ASIDE_DEV, USB_OTG_MODE_BSIDE_HOST, USB_OTG_MODE_BSIDE_DEV, USB_OTG_MODE_NONE, USB_DUAL_MODE_HOST, USB_DUAL_MODE_DEVICE, or USB_DUAL_MODE_NONE.

void USBEndpointDMAChannel(uint32_t ui32Base, uint32_t ui32Endpoint, uint32_t ui32Channel)

Sets the DMA channel to use for a given endpoint.

This function is used to configure which DMA channel to use with a given endpoint. Receive DMA channels can only be used with receive endpoints and transmit DMA channels can only be used with transmit endpoints. As a result, the 3 receive and 3 transmit DMA channels can be mapped to any endpoint other than 0. The values that are passed into the

ui32Channel value are the UDMA_CHANNEL_USBEP* values defined in udma.h.
Parameters

  • ui32Base: specifies the USB module base address.

  • ui32Endpoint: specifies which endpoint’s FIFO address to return.

  • ui32Channel: specifies which DMA channel to use for which endpoint.

Note

This function only has an effect on microcontrollers that have the ability to change the DMA channel for an endpoint. Calling this function on other devices has no effect.

Return

None.

void USBHostMode(uint32_t ui32Base)

Change the mode of the USB controller to host.

This function changes the mode of the USB controller to host mode.

Parameters

  • ui32Base: specifies the USB module base address.

Note

This function must only be called on microcontrollers that support OTG operation and have the DEVMODOTG bit in the USBGPCS register.

Return

None.

void USBDevMode(uint32_t ui32Base)

Change the mode of the USB controller to device.

This function changes the mode of the USB controller to device mode.

Parameters

  • ui32Base: specifies the USB module base address.

Note

This function must only be called on microcontrollers that support OTG operation and have the DEVMODOTG bit in the USBGPCS register.

Return

None.

void USBOTGMode(uint32_t ui32Base)

Change the mode of the USB controller to OTG.

This function changes the mode of the USB controller to OTG mode. This function is only valid on microcontrollers that have the OTG capabilities.

Parameters

  • ui32Base: specifies the USB module base address.

Return

None.

void USBPHYPowerOff(uint32_t ui32Base)

Powers off the USB PHY.

This function powers off the USB PHY, reducing the current consuption of the device. While in the powered-off state, the USB controller is unable to operate.

Parameters

  • ui32Base: specifies the USB module base address.

Return

None.

void USBPHYPowerOn(uint32_t ui32Base)

Powers on the USB PHY.

This function powers on the USB PHY, enabling it return to normal operation. By default, the PHY is powered on, so this function must only be called if

USBPHYPowerOff() has previously been called.
Parameters

  • ui32Base: specifies the USB module base address.

Return

None.

uint32_t USBNumEndpointsGet(uint32_t ui32Base)

Returns the number of USB endpoint pairs on the device.

This function returns the number of endpoint pairs supported by the USB controller corresponding to the passed base address. The value returned is the number of IN or OUT endpoints available and does not include endpoint 0 (the control endpoint). For example, if 15 is returned, there are 15 IN and 15 OUT endpoints available in addition to endpoint 0.

Parameters

  • ui32Base: specifies the USB module base address.

Return

Returns the number of IN or OUT endpoints available.

The code for this module is contained in driverlib/usb.c, with driverlib/usb.h containing the API declarations for use by applications.