Functions
I2c_api

Functions

void I2CMasterInitExpClk (uint32_t ui32Base, uint32_t ui32I2CClk, bool bFast)
 
void I2CSlaveInit (uint32_t ui32Base, uint8_t ui8SlaveAddr)
 
void I2CSlaveAddressSet (uint32_t ui32Base, uint8_t ui8AddrNum, uint8_t ui8SlaveAddr)
 
void I2CMasterEnable (uint32_t ui32Base)
 
void I2CSlaveEnable (uint32_t ui32Base)
 
void I2CMasterDisable (uint32_t ui32Base)
 
void I2CSlaveDisable (uint32_t ui32Base)
 
void I2CIntRegister (uint32_t ui32Base, void(*pfnHandler)(void))
 
void I2CIntUnregister (uint32_t ui32Base)
 
void I2CMasterIntEnable (uint32_t ui32Base)
 
void I2CMasterIntEnableEx (uint32_t ui32Base, uint32_t ui32IntFlags)
 
void I2CSlaveIntEnable (uint32_t ui32Base)
 
void I2CSlaveIntEnableEx (uint32_t ui32Base, uint32_t ui32IntFlags)
 
void I2CMasterIntDisable (uint32_t ui32Base)
 
void I2CMasterIntDisableEx (uint32_t ui32Base, uint32_t ui32IntFlags)
 
void I2CSlaveIntDisable (uint32_t ui32Base)
 
void I2CSlaveIntDisableEx (uint32_t ui32Base, uint32_t ui32IntFlags)
 
bool I2CMasterIntStatus (uint32_t ui32Base, bool bMasked)
 
uint32_t I2CMasterIntStatusEx (uint32_t ui32Base, bool bMasked)
 
bool I2CSlaveIntStatus (uint32_t ui32Base, bool bMasked)
 
uint32_t I2CSlaveIntStatusEx (uint32_t ui32Base, bool bMasked)
 
void I2CMasterIntClear (uint32_t ui32Base)
 
void I2CMasterIntClearEx (uint32_t ui32Base, uint32_t ui32IntFlags)
 
void I2CSlaveIntClear (uint32_t ui32Base)
 
void I2CSlaveIntClearEx (uint32_t ui32Base, uint32_t ui32IntFlags)
 
void I2CMasterSlaveAddrSet (uint32_t ui32Base, uint8_t ui8SlaveAddr, bool bReceive)
 
uint32_t I2CMasterLineStateGet (uint32_t ui32Base)
 
bool I2CMasterBusy (uint32_t ui32Base)
 
bool I2CMasterBusBusy (uint32_t ui32Base)
 
void I2CMasterControl (uint32_t ui32Base, uint32_t ui32Cmd)
 
uint32_t I2CMasterErr (uint32_t ui32Base)
 
void I2CMasterDataPut (uint32_t ui32Base, uint8_t ui8Data)
 
uint32_t I2CMasterDataGet (uint32_t ui32Base)
 
void I2CMasterTimeoutSet (uint32_t ui32Base, uint32_t ui32Value)
 
void I2CSlaveACKOverride (uint32_t ui32Base, bool bEnable)
 
void I2CSlaveACKValueSet (uint32_t ui32Base, bool bACK)
 
uint32_t I2CSlaveStatus (uint32_t ui32Base)
 
void I2CSlaveDataPut (uint32_t ui32Base, uint8_t ui8Data)
 
uint32_t I2CSlaveDataGet (uint32_t ui32Base)
 
void I2CTxFIFOConfigSet (uint32_t ui32Base, uint32_t ui32Config)
 
void I2CTxFIFOFlush (uint32_t ui32Base)
 
void I2CRxFIFOConfigSet (uint32_t ui32Base, uint32_t ui32Config)
 
void I2CRxFIFOFlush (uint32_t ui32Base)
 
uint32_t I2CFIFOStatus (uint32_t ui32Base)
 
void I2CFIFODataPut (uint32_t ui32Base, uint8_t ui8Data)
 
uint32_t I2CFIFODataPutNonBlocking (uint32_t ui32Base, uint8_t ui8Data)
 
uint32_t I2CFIFODataGet (uint32_t ui32Base)
 
uint32_t I2CFIFODataGetNonBlocking (uint32_t ui32Base, uint8_t *pui8Data)
 
void I2CMasterBurstLengthSet (uint32_t ui32Base, uint8_t ui8Length)
 
uint32_t I2CMasterBurstCountGet (uint32_t ui32Base)
 
void I2CMasterGlitchFilterConfigSet (uint32_t ui32Base, uint32_t ui32Config)
 
void I2CSlaveFIFOEnable (uint32_t ui32Base, uint32_t ui32Config)
 
void I2CSlaveFIFODisable (uint32_t ui32Base)
 
void I2CLoopbackEnable (uint32_t ui32Base)
 

Detailed Description

Function Documentation

§ I2CMasterInitExpClk()

void I2CMasterInitExpClk ( uint32_t  ui32Base,
uint32_t  ui32I2CClk,
bool  bFast 
)

Initializes the I2C Master block.

Parameters
ui32Baseis the base address of the I2C module.
ui32I2CClkis the rate of the clock supplied to the I2C module.
bFastset up for fast data transfers.

This function initializes operation of the I2C Master block by configuring the bus speed for the master and enabling the I2C Master block.

If the parameter bFast is true, then the master block is set up to transfer data at 400 Kbps; otherwise, it is set up to transfer data at 100 Kbps. If Fast Mode Plus (1 Mbps) is desired, software should manually write the I2CMTPR after calling this function. For High Speed (3.4 Mbps) mode, a specific command is used to switch to the faster clocks after the initial communication with the slave is done at either 100 Kbps or 400 Kbps.

The peripheral clock is the same as the processor clock. The frequency of the system clock is the value returned by SysCtlClockFreqSet(), or it can be explicitly hard coded if it is constant and known (to save the code/execution overhead of fetch of the variable call holding the return value of SysCtlClockFreqSet()).

Returns
None.

References ASSERT, HWREG, I2C_MTPR_HS, I2C_O_MTPR, I2C_O_PP, I2C_PP_HS, and I2CMasterEnable().

§ I2CSlaveInit()

void I2CSlaveInit ( uint32_t  ui32Base,
uint8_t  ui8SlaveAddr 
)

Initializes the I2C Slave block.

Parameters
ui32Baseis the base address of the I2C module.
ui8SlaveAddr7-bit slave address

This function initializes operation of the I2C Slave block by configuring the slave address and enabling the I2C Slave block.

The parameter ui8SlaveAddr is the value that is compared against the slave address sent by an I2C master.

Returns
None.

References ASSERT, HWREG, I2C_O_SOAR, and I2CSlaveEnable().

§ I2CSlaveAddressSet()

void I2CSlaveAddressSet ( uint32_t  ui32Base,
uint8_t  ui8AddrNum,
uint8_t  ui8SlaveAddr 
)

Sets the I2C slave address.

Parameters
ui32Baseis the base address of the I2C module.
ui8AddrNumdetermines which slave address is set.
ui8SlaveAddris the 7-bit slave address

This function writes the specified slave address. The ui32AddrNum field dictates which slave address is configured. For example, a value of 0 configures the primary address and a value of 1 configures the secondary.

Returns
None.

References ASSERT, HWREG, I2C_O_SOAR, I2C_O_SOAR2, and I2C_SOAR2_OAR2EN.

§ I2CMasterEnable()

void I2CMasterEnable ( uint32_t  ui32Base)

Enables the I2C Master block.

Parameters
ui32Baseis the base address of the I2C module.

This function enables operation of the I2C Master block.

Returns
None.

References ASSERT, HWREG, I2C_MCR_MFE, and I2C_O_MCR.

Referenced by I2CMasterInitExpClk().

§ I2CSlaveEnable()

void I2CSlaveEnable ( uint32_t  ui32Base)

Enables the I2C Slave block.

Parameters
ui32Baseis the base address of the I2C module.

This fucntion enables operation of the I2C Slave block.

Returns
None.

References ASSERT, HWREG, I2C_MCR_SFE, I2C_O_MCR, I2C_O_SCSR, and I2C_SCSR_DA.

Referenced by I2CSlaveInit().

§ I2CMasterDisable()

void I2CMasterDisable ( uint32_t  ui32Base)

Disables the I2C master block.

Parameters
ui32Baseis the base address of the I2C module.

This function disables operation of the I2C master block.

Returns
None.

References ASSERT, HWREG, I2C_MCR_MFE, and I2C_O_MCR.

§ I2CSlaveDisable()

void I2CSlaveDisable ( uint32_t  ui32Base)

Disables the I2C slave block.

Parameters
ui32Baseis the base address of the I2C module.

This function disables operation of the I2C slave block.

Returns
None.

References ASSERT, HWREG, I2C_MCR_SFE, I2C_O_MCR, and I2C_O_SCSR.

§ I2CIntRegister()

void I2CIntRegister ( uint32_t  ui32Base,
void(*)(void)  pfnHandler 
)

Registers an interrupt handler for the I2C module.

Parameters
ui32Baseis the base address of the I2C module.
pfnHandleris a pointer to the function to be called when the I2C interrupt occurs.

This function sets the handler to be called when an I2C interrupt occurs. This function enables the global interrupt in the interrupt controller; specific I2C interrupts must be enabled via I2CMasterIntEnable() and I2CSlaveIntEnable(). If necessary, it is the interrupt handler's responsibility to clear the interrupt source via I2CMasterIntClear() and I2CSlaveIntClear().

See also
IntRegister() for important information about registering interrupt handlers.
Returns
None.

References ASSERT.

§ I2CIntUnregister()

void I2CIntUnregister ( uint32_t  ui32Base)

Unregisters an interrupt handler for the I2C module.

Parameters
ui32Baseis the base address of the I2C module.

This function clears the handler to be called when an I2C interrupt occurs. This function also masks off the interrupt in the interrupt r controller so that the interrupt handler no longer is called.

See also
IntRegister() for important information about registering interrupt handlers.
Returns
None.

References ASSERT.

§ I2CMasterIntEnable()

void I2CMasterIntEnable ( uint32_t  ui32Base)

Enables the I2C Master interrupt.

Parameters
ui32Baseis the base address of the I2C module.

This function enables the I2C Master interrupt source.

Returns
None.

References ASSERT, HWREG, and I2C_O_MIMR.

§ I2CMasterIntEnableEx()

void I2CMasterIntEnableEx ( uint32_t  ui32Base,
uint32_t  ui32IntFlags 
)

Enables individual I2C Master interrupt sources.

Parameters
ui32Baseis the base address of the I2C module.
ui32IntFlagsis the bit mask of the interrupt sources to be enabled.

This function enables the indicated I2C Master interrupt sources. Only the sources that are enabled can be reflected to the processor interrupt; disabled sources have no effect on the processor.

The ui32IntFlags parameter is the logical OR of any of the following:

  • I2C_MASTER_INT_RX_FIFO_FULL - RX FIFO Full interrupt
  • I2C_MASTER_INT_TX_FIFO_EMPTY - TX FIFO Empty interrupt
  • I2C_MASTER_INT_RX_FIFO_REQ - RX FIFO Request interrupt
  • I2C_MASTER_INT_TX_FIFO_REQ - TX FIFO Request interrupt
  • I2C_MASTER_INT_ARB_LOST - Arbitration Lost interrupt
  • I2C_MASTER_INT_STOP - Stop Condition interrupt
  • I2C_MASTER_INT_START - Start Condition interrupt
  • I2C_MASTER_INT_NACK - Address/Data NACK interrupt
  • I2C_MASTER_INT_TX_DMA_DONE - TX DMA Complete interrupt
  • I2C_MASTER_INT_RX_DMA_DONE - RX DMA Complete interrupt
  • I2C_MASTER_INT_TIMEOUT - Clock Timeout interrupt
  • I2C_MASTER_INT_DATA - Data interrupt
Returns
None.

References ASSERT, HWREG, and I2C_O_MIMR.

§ I2CSlaveIntEnable()

void I2CSlaveIntEnable ( uint32_t  ui32Base)

Enables the I2C Slave interrupt.

Parameters
ui32Baseis the base address of the I2C module.

This function enables the I2C Slave interrupt source.

Returns
None.

References ASSERT, HWREG, I2C_O_SIMR, and I2C_SLAVE_INT_DATA.

§ I2CSlaveIntEnableEx()

void I2CSlaveIntEnableEx ( uint32_t  ui32Base,
uint32_t  ui32IntFlags 
)

Enables individual I2C Slave interrupt sources.

Parameters
ui32Baseis the base address of the I2C module.
ui32IntFlagsis the bit mask of the interrupt sources to be enabled.

This function enables the indicated I2C Slave interrupt sources. Only the sources that are enabled can be reflected to the processor interrupt; disabled sources have no effect on the processor.

The ui32IntFlags parameter is the logical OR of any of the following:

  • I2C_SLAVE_INT_RX_FIFO_FULL - RX FIFO Full interrupt
  • I2C_SLAVE_INT_TX_FIFO_EMPTY - TX FIFO Empty interrupt
  • I2C_SLAVE_INT_RX_FIFO_REQ - RX FIFO Request interrupt
  • I2C_SLAVE_INT_TX_FIFO_REQ - TX FIFO Request interrupt
  • I2C_SLAVE_INT_TX_DMA_DONE - TX DMA Complete interrupt
  • I2C_SLAVE_INT_RX_DMA_DONE - RX DMA Complete interrupt
  • I2C_SLAVE_INT_STOP - Stop condition detected interrupt
  • I2C_SLAVE_INT_START - Start condition detected interrupt
  • I2C_SLAVE_INT_DATA - Data interrupt
Returns
None.

References ASSERT, HWREG, and I2C_O_SIMR.

§ I2CMasterIntDisable()

void I2CMasterIntDisable ( uint32_t  ui32Base)

Disables the I2C Master interrupt.

Parameters
ui32Baseis the base address of the I2C module.

This function disables the I2C Master interrupt source.

Returns
None.

References ASSERT, HWREG, and I2C_O_MIMR.

§ I2CMasterIntDisableEx()

void I2CMasterIntDisableEx ( uint32_t  ui32Base,
uint32_t  ui32IntFlags 
)

Disables individual I2C Master interrupt sources.

Parameters
ui32Baseis the base address of the I2C module.
ui32IntFlagsis the bit mask of the interrupt sources to be disabled.

This function disables the indicated I2C Master interrupt sources. Only the sources that are enabled can be reflected to the processor interrupt; disabled sources have no effect on the processor.

The ui32IntFlags parameter has the same definition as the ui32IntFlags parameter to I2CMasterIntEnableEx().

Returns
None.

References ASSERT, HWREG, and I2C_O_MIMR.

§ I2CSlaveIntDisable()

void I2CSlaveIntDisable ( uint32_t  ui32Base)

Disables the I2C Slave interrupt.

Parameters
ui32Baseis the base address of the I2C module.

This function disables the I2C Slave interrupt source.

Returns
None.

References ASSERT, HWREG, I2C_O_SIMR, and I2C_SLAVE_INT_DATA.

§ I2CSlaveIntDisableEx()

void I2CSlaveIntDisableEx ( uint32_t  ui32Base,
uint32_t  ui32IntFlags 
)

Disables individual I2C Slave interrupt sources.

Parameters
ui32Baseis the base address of the I2C module.
ui32IntFlagsis the bit mask of the interrupt sources to be disabled.

This function disables the indicated I2C Slave interrupt sources. Only the sources that are enabled can be reflected to the processor interrupt; disabled sources have no effect on the processor.

The ui32IntFlags parameter has the same definition as the ui32IntFlags parameter to I2CSlaveIntEnableEx().

Returns
None.

References ASSERT, HWREG, and I2C_O_SIMR.

§ I2CMasterIntStatus()

bool I2CMasterIntStatus ( uint32_t  ui32Base,
bool  bMasked 
)

Gets the current I2C Master interrupt status.

Parameters
ui32Baseis the base address of the I2C module.
bMaskedis false if the raw interrupt status is requested and true if the masked interrupt status is requested.

This function returns the interrupt status for the I2C module. Either the raw interrupt status or the status of interrupts that are allowed to reflect to the processor can be returned.

Returns
The current interrupt status, returned as true if active or false if not active.

References ASSERT, HWREG, I2C_O_MMIS, and I2C_O_MRIS.

§ I2CMasterIntStatusEx()

uint32_t I2CMasterIntStatusEx ( uint32_t  ui32Base,
bool  bMasked 
)

Gets the current I2C Master interrupt status.

Parameters
ui32Baseis the base address of the I2C module.
bMaskedis false if the raw interrupt status is requested and true if the masked interrupt status is requested.

This function returns the interrupt status for the I2C module. Either the raw interrupt status or the status of interrupts that are allowed to reflect to the processor can be returned.

Returns
Returns the current interrupt status, enumerated as a bit field of values described in I2CMasterIntEnableEx().

References ASSERT, HWREG, I2C_O_MMIS, and I2C_O_MRIS.

§ I2CSlaveIntStatus()

bool I2CSlaveIntStatus ( uint32_t  ui32Base,
bool  bMasked 
)

Gets the current I2C Slave interrupt status.

Parameters
ui32Baseis the base address of the I2C module.
bMaskedis false if the raw interrupt status is requested and true if the masked interrupt status is requested.

This function returns the interrupt status for the I2C Slave. Either the raw interrupt status or the status of interrupts that are allowed to reflect to the processor can be returned.

Returns
The current interrupt status, returned as true if active or false if not active.

References ASSERT, HWREG, I2C_O_SMIS, and I2C_O_SRIS.

§ I2CSlaveIntStatusEx()

uint32_t I2CSlaveIntStatusEx ( uint32_t  ui32Base,
bool  bMasked 
)

Gets the current I2C Slave interrupt status.

Parameters
ui32Baseis the base address of the I2C module.
bMaskedis false if the raw interrupt status is requested and true if the masked interrupt status is requested.

This function returns the interrupt status for the I2C Slave. Either the raw interrupt status or the status of interrupts that are allowed to reflect to the processor can be returned.

Returns
Returns the current interrupt status, enumerated as a bit field of values described in I2CSlaveIntEnableEx().

References ASSERT, HWREG, I2C_O_SMIS, and I2C_O_SRIS.

§ I2CMasterIntClear()

void I2CMasterIntClear ( uint32_t  ui32Base)

Clears I2C Master interrupt sources.

Parameters
ui32Baseis the base address of the I2C module.

The I2C Master interrupt source is cleared, so that it no longer asserts. This function must be called in the interrupt handler to keep the interrupt from being triggered again immediately upon exit.

Note
Because there is a write buffer in the Cortex-M processor, it may take several clock cycles before the interrupt source is actually cleared. Therefore, it is recommended that the interrupt source be cleared early in the interrupt handler (as opposed to the very last action) to avoid returning from the interrupt handler before the interrupt source is actually cleared. Failure to do so may result in the interrupt handler being immediately reentered (because the interrupt controller still sees the interrupt source asserted).
Returns
None.

References ASSERT, HWREG, I2C_MICR_IC, I2C_O_MICR, and I2C_O_MMIS.

§ I2CMasterIntClearEx()

void I2CMasterIntClearEx ( uint32_t  ui32Base,
uint32_t  ui32IntFlags 
)

Clears I2C Master interrupt sources.

Parameters
ui32Baseis the base address of the I2C module.
ui32IntFlagsis a bit mask of the interrupt sources to be cleared.

The specified I2C Master interrupt sources are cleared, so that they no longer assert. This function must be called in the interrupt handler to keep the interrupt from being triggered again immediately upon exit.

The ui32IntFlags parameter has the same definition as the ui32IntFlags parameter to I2CMasterIntEnableEx().

Note
Because there is a write buffer in the Cortex-M processor, it may take several clock cycles before the interrupt source is actually cleared. Therefore, it is recommended that the interrupt source be cleared early in the interrupt handler (as opposed to the very last action) to avoid returning from the interrupt handler before the interrupt source is actually cleared. Failure to do so may result in the interrupt handler being immediately reentered (because the interrupt controller still sees the interrupt source asserted).
Returns
None.

References ASSERT, HWREG, and I2C_O_MICR.

§ I2CSlaveIntClear()

void I2CSlaveIntClear ( uint32_t  ui32Base)

Clears I2C Slave interrupt sources.

Parameters
ui32Baseis the base address of the I2C module.

The I2C Slave interrupt source is cleared, so that it no longer asserts. This function must be called in the interrupt handler to keep the interrupt from being triggered again immediately upon exit.

Note
Because there is a write buffer in the Cortex-M processor, it may take several clock cycles before the interrupt source is actually cleared. Therefore, it is recommended that the interrupt source be cleared early in the interrupt handler (as opposed to the very last action) to avoid returning from the interrupt handler before the interrupt source is actually cleared. Failure to do so may result in the interrupt handler being immediately reentered (because the interrupt controller still sees the interrupt source asserted).
Returns
None.

References ASSERT, HWREG, I2C_O_SICR, and I2C_SICR_DATAIC.

§ I2CSlaveIntClearEx()

void I2CSlaveIntClearEx ( uint32_t  ui32Base,
uint32_t  ui32IntFlags 
)

Clears I2C Slave interrupt sources.

Parameters
ui32Baseis the base address of the I2C module.
ui32IntFlagsis a bit mask of the interrupt sources to be cleared.

The specified I2C Slave interrupt sources are cleared, so that they no longer assert. This function must be called in the interrupt handler to keep the interrupt from being triggered again immediately upon exit.

The ui32IntFlags parameter has the same definition as the ui32IntFlags parameter to I2CSlaveIntEnableEx().

Note
Because there is a write buffer in the Cortex-M processor, it may take several clock cycles before the interrupt source is actually cleared. Therefore, it is recommended that the interrupt source be cleared early in the interrupt handler (as opposed to the very last action) to avoid returning from the interrupt handler before the interrupt source is actually cleared. Failure to do so may result in the interrupt handler being immediately reentered (because the interrupt controller still sees the interrupt source asserted).
Returns
None.

References ASSERT, HWREG, and I2C_O_SICR.

§ I2CMasterSlaveAddrSet()

void I2CMasterSlaveAddrSet ( uint32_t  ui32Base,
uint8_t  ui8SlaveAddr,
bool  bReceive 
)

Sets the address that the I2C Master places on the bus.

Parameters
ui32Baseis the base address of the I2C module.
ui8SlaveAddr7-bit slave address
bReceiveflag indicating the type of communication with the slave

This function configures the address that the I2C Master places on the bus when initiating a transaction. When the bReceive parameter is set to true, the address indicates that the I2C Master is initiating a read from the slave; otherwise the address indicates that the I2C Master is initiating a write to the slave.

Returns
None.

References ASSERT, HWREG, and I2C_O_MSA.

§ I2CMasterLineStateGet()

uint32_t I2CMasterLineStateGet ( uint32_t  ui32Base)

Reads the state of the SDA and SCL pins.

Parameters
ui32Baseis the base address of the I2C module.

This function returns the state of the I2C bus by providing the real time values of the SDA and SCL pins.

Returns
Returns the state of the bus with SDA in bit position 1 and SCL in bit position 0.

References ASSERT, HWREG, and I2C_O_MBMON.

§ I2CMasterBusy()

bool I2CMasterBusy ( uint32_t  ui32Base)

Indicates whether or not the I2C Master is busy.

Parameters
ui32Baseis the base address of the I2C module.

This function returns an indication of whether or not the I2C Master is busy transmitting or receiving data.

Returns
Returns true if the I2C Master is busy; otherwise, returns false.

References ASSERT, HWREG, I2C_MCS_BUSY, and I2C_O_MCS.

§ I2CMasterBusBusy()

bool I2CMasterBusBusy ( uint32_t  ui32Base)

Indicates whether or not the I2C bus is busy.

Parameters
ui32Baseis the base address of the I2C module.

This function returns an indication of whether or not the I2C bus is busy. This function can be used in a multi-master environment to determine if another master is currently using the bus.

Returns
Returns true if the I2C bus is busy; otherwise, returns false.

References ASSERT, HWREG, I2C_MCS_BUSBSY, and I2C_O_MCS.

§ I2CMasterControl()

void I2CMasterControl ( uint32_t  ui32Base,
uint32_t  ui32Cmd 
)

Controls the state of the I2C Master.

Parameters
ui32Baseis the base address of the I2C module.
ui32Cmdcommand to be issued to the I2C Master.

This function is used to control the state of the Master send and receive operations. The ui8Cmd parameter can be one of the following values:

  • I2C_MASTER_CMD_SINGLE_SEND
  • I2C_MASTER_CMD_SINGLE_RECEIVE
  • I2C_MASTER_CMD_BURST_SEND_START
  • I2C_MASTER_CMD_BURST_SEND_CONT
  • I2C_MASTER_CMD_BURST_SEND_FINISH
  • I2C_MASTER_CMD_BURST_SEND_ERROR_STOP
  • I2C_MASTER_CMD_BURST_RECEIVE_START
  • I2C_MASTER_CMD_BURST_RECEIVE_CONT
  • I2C_MASTER_CMD_BURST_RECEIVE_FINISH
  • I2C_MASTER_CMD_BURST_RECEIVE_ERROR_STOP
  • I2C_MASTER_CMD_QUICK_COMMAND
  • I2C_MASTER_CMD_HS_MASTER_CODE_SEND
  • I2C_MASTER_CMD_FIFO_SINGLE_SEND
  • I2C_MASTER_CMD_FIFO_SINGLE_RECEIVE
  • I2C_MASTER_CMD_FIFO_BURST_SEND_START
  • I2C_MASTER_CMD_FIFO_BURST_SEND_CONT
  • I2C_MASTER_CMD_FIFO_BURST_SEND_FINISH
  • I2C_MASTER_CMD_FIFO_BURST_SEND_ERROR_STOP
  • I2C_MASTER_CMD_FIFO_BURST_RECEIVE_START
  • I2C_MASTER_CMD_FIFO_BURST_RECEIVE_CONT
  • I2C_MASTER_CMD_FIFO_BURST_RECEIVE_FINISH
  • I2C_MASTER_CMD_FIFO_BURST_RECEIVE_ERROR_STOP
Returns
None.

References ASSERT, HWREG, I2C_MASTER_CMD_BURST_RECEIVE_CONT, I2C_MASTER_CMD_BURST_RECEIVE_ERROR_STOP, I2C_MASTER_CMD_BURST_RECEIVE_FINISH, I2C_MASTER_CMD_BURST_RECEIVE_START, I2C_MASTER_CMD_BURST_SEND_CONT, I2C_MASTER_CMD_BURST_SEND_ERROR_STOP, I2C_MASTER_CMD_BURST_SEND_FINISH, I2C_MASTER_CMD_BURST_SEND_START, I2C_MASTER_CMD_FIFO_BURST_RECEIVE_CONT, I2C_MASTER_CMD_FIFO_BURST_RECEIVE_ERROR_STOP, I2C_MASTER_CMD_FIFO_BURST_RECEIVE_FINISH, I2C_MASTER_CMD_FIFO_BURST_RECEIVE_START, I2C_MASTER_CMD_FIFO_BURST_SEND_CONT, I2C_MASTER_CMD_FIFO_BURST_SEND_ERROR_STOP, I2C_MASTER_CMD_FIFO_BURST_SEND_FINISH, I2C_MASTER_CMD_FIFO_BURST_SEND_START, I2C_MASTER_CMD_FIFO_SINGLE_RECEIVE, I2C_MASTER_CMD_FIFO_SINGLE_SEND, I2C_MASTER_CMD_HS_MASTER_CODE_SEND, I2C_MASTER_CMD_QUICK_COMMAND, I2C_MASTER_CMD_SINGLE_RECEIVE, I2C_MASTER_CMD_SINGLE_SEND, and I2C_O_MCS.

§ I2CMasterErr()

uint32_t I2CMasterErr ( uint32_t  ui32Base)

Gets the error status of the I2C Master.

Parameters
ui32Baseis the base address of the I2C module.

This function is used to obtain the error status of the Master send and receive operations.

Returns
Returns the error status, as one of I2C_MASTER_ERR_NONE, I2C_MASTER_ERR_ADDR_ACK, I2C_MASTER_ERR_DATA_ACK, or I2C_MASTER_ERR_ARB_LOST.

References ASSERT, HWREG, I2C_MASTER_ERR_NONE, I2C_MCS_ADRACK, I2C_MCS_ARBLST, I2C_MCS_BUSY, I2C_MCS_DATACK, I2C_MCS_ERROR, and I2C_O_MCS.

§ I2CMasterDataPut()

void I2CMasterDataPut ( uint32_t  ui32Base,
uint8_t  ui8Data 
)

Transmits a byte from the I2C Master.

Parameters
ui32Baseis the base address of the I2C module.
ui8Datadata to be transmitted from the I2C Master.

This function places the supplied data into I2C Master Data Register.

Returns
None.

References ASSERT, HWREG, and I2C_O_MDR.

§ I2CMasterDataGet()

uint32_t I2CMasterDataGet ( uint32_t  ui32Base)

Receives a byte that has been sent to the I2C Master.

Parameters
ui32Baseis the base address of the I2C module.

This function reads a byte of data from the I2C Master Data Register.

Returns
Returns the byte received from by the I2C Master, cast as an uint32_t.

References ASSERT, HWREG, and I2C_O_MDR.

§ I2CMasterTimeoutSet()

void I2CMasterTimeoutSet ( uint32_t  ui32Base,
uint32_t  ui32Value 
)

Sets the Master clock timeout value.

Parameters
ui32Baseis the base address of the I2C module.
ui32Valueis the number of I2C clocks before the timeout is asserted.

This function enables and configures the clock low timeout feature in the I2C peripheral. This feature is implemented as a 12-bit counter, with the upper 8-bits being programmable. For example, to program a timeout of 20ms with a 100-kHz SCL frequency, ui32Value is 0x7d.

Returns
None.

References ASSERT, HWREG, and I2C_O_MCLKOCNT.

§ I2CSlaveACKOverride()

void I2CSlaveACKOverride ( uint32_t  ui32Base,
bool  bEnable 
)

Configures ACK override behavior of the I2C Slave.

Parameters
ui32Baseis the base address of the I2C module.
bEnableenables or disables ACK override.

This function enables or disables ACK override, allowing the user application to drive the value on SDA during the ACK cycle.

Returns
None.

References ASSERT, HWREG, I2C_O_SACKCTL, and I2C_SACKCTL_ACKOEN.

§ I2CSlaveACKValueSet()

void I2CSlaveACKValueSet ( uint32_t  ui32Base,
bool  bACK 
)

Writes the ACK value.

Parameters
ui32Baseis the base address of the I2C module.
bACKchooses whether to ACK (true) or NACK (false) the transfer.

This function puts the desired ACK value on SDA during the ACK cycle. The value written is only valid when ACK override is enabled using I2CSlaveACKOverride().

Returns
None.

References ASSERT, HWREG, I2C_O_SACKCTL, and I2C_SACKCTL_ACKOVAL.

§ I2CSlaveStatus()

uint32_t I2CSlaveStatus ( uint32_t  ui32Base)

Gets the I2C Slave status

Parameters
ui32Baseis the base address of the I2C module.

This function returns the action requested from a master, if any. Possible values are:

  • I2C_SLAVE_ACT_NONE
  • I2C_SLAVE_ACT_RREQ
  • I2C_SLAVE_ACT_TREQ
  • I2C_SLAVE_ACT_RREQ_FBR
  • I2C_SLAVE_ACT_OWN2SEL
  • I2C_SLAVE_ACT_QCMD
  • I2C_SLAVE_ACT_QCMD_DATA
Returns
Returns I2C_SLAVE_ACT_NONE to indicate that no action has been requested of the I2C Slave, I2C_SLAVE_ACT_RREQ to indicate that an I2C master has sent data to the I2C Slave, I2C_SLAVE_ACT_TREQ to indicate that an I2C master has requested that the I2C Slave send data, I2C_SLAVE_ACT_RREQ_FBR to indicate that an I2C master has sent data to the I2C slave and the first byte following the slave's own address has been received, I2C_SLAVE_ACT_OWN2SEL to indicate that the second I2C slave address was matched, I2C_SLAVE_ACT_QCMD to indicate that a quick command was received, and I2C_SLAVE_ACT_QCMD_DATA to indicate that the data bit was set when the quick command was received.

References ASSERT, HWREG, and I2C_O_SCSR.

§ I2CSlaveDataPut()

void I2CSlaveDataPut ( uint32_t  ui32Base,
uint8_t  ui8Data 
)

Transmits a byte from the I2C Slave.

Parameters
ui32Baseis the base address of the I2C module.
ui8Datais the data to be transmitted from the I2C Slave

This function places the supplied data into I2C Slave Data Register.

Returns
None.

References ASSERT, HWREG, and I2C_O_SDR.

§ I2CSlaveDataGet()

uint32_t I2CSlaveDataGet ( uint32_t  ui32Base)

Receives a byte that has been sent to the I2C Slave.

Parameters
ui32Baseis the base address of the I2C module.

This function reads a byte of data from the I2C Slave Data Register.

Returns
Returns the byte received from by the I2C Slave, cast as an uint32_t.

References ASSERT, HWREG, and I2C_O_SDR.

§ I2CTxFIFOConfigSet()

void I2CTxFIFOConfigSet ( uint32_t  ui32Base,
uint32_t  ui32Config 
)

Configures the I2C transmit (TX) FIFO.

Parameters
ui32Baseis the base address of the I2C module.
ui32Configis the configuration of the FIFO using specified macros.

This configures the I2C peripheral's transmit FIFO. The transmit FIFO can be used by the master or slave, but not both. The following macros are used to configure the TX FIFO behavior for master or slave, with or without DMA:

I2C_FIFO_CFG_TX_MASTER, I2C_FIFO_CFG_TX_SLAVE, I2C_FIFO_CFG_TX_MASTER_DMA, I2C_FIFO_CFG_TX_SLAVE_DMA

To select the trigger level, one of the following macros should be used:

I2C_FIFO_CFG_TX_TRIG_1, I2C_FIFO_CFG_TX_TRIG_2, I2C_FIFO_CFG_TX_TRIG_3, I2C_FIFO_CFG_TX_TRIG_4, I2C_FIFO_CFG_TX_TRIG_5, I2C_FIFO_CFG_TX_TRIG_6, I2C_FIFO_CFG_TX_TRIG_7, I2C_FIFO_CFG_TX_TRIG_8

Returns
None.

References ASSERT, HWREG, and I2C_O_FIFOCTL.

§ I2CTxFIFOFlush()

void I2CTxFIFOFlush ( uint32_t  ui32Base)

Flushes the transmit (TX) FIFO.

Parameters
ui32Baseis the base address of the I2C module.

This function flushes the I2C transmit FIFO.

Returns
None.

References ASSERT, HWREG, I2C_FIFOCTL_TXFLUSH, and I2C_O_FIFOCTL.

§ I2CRxFIFOConfigSet()

void I2CRxFIFOConfigSet ( uint32_t  ui32Base,
uint32_t  ui32Config 
)

Configures the I2C receive (RX) FIFO.

Parameters
ui32Baseis the base address of the I2C module.
ui32Configis the configuration of the FIFO using specified macros.

This configures the I2C peripheral's receive FIFO. The receive FIFO can be used by the master or slave, but not both. The following macros are used to configure the RX FIFO behavior for master or slave, with or without DMA:

I2C_FIFO_CFG_RX_MASTER, I2C_FIFO_CFG_RX_SLAVE, I2C_FIFO_CFG_RX_MASTER_DMA, I2C_FIFO_CFG_RX_SLAVE_DMA

To select the trigger level, one of the following macros should be used:

I2C_FIFO_CFG_RX_TRIG_1, I2C_FIFO_CFG_RX_TRIG_2, I2C_FIFO_CFG_RX_TRIG_3, I2C_FIFO_CFG_RX_TRIG_4, I2C_FIFO_CFG_RX_TRIG_5, I2C_FIFO_CFG_RX_TRIG_6, I2C_FIFO_CFG_RX_TRIG_7, I2C_FIFO_CFG_RX_TRIG_8

Returns
None.

References ASSERT, HWREG, and I2C_O_FIFOCTL.

§ I2CRxFIFOFlush()

void I2CRxFIFOFlush ( uint32_t  ui32Base)

Flushes the receive (RX) FIFO.

Parameters
ui32Baseis the base address of the I2C module.

This function flushes the I2C receive FIFO.

Returns
None.

References ASSERT, HWREG, I2C_FIFOCTL_RXFLUSH, and I2C_O_FIFOCTL.

§ I2CFIFOStatus()

uint32_t I2CFIFOStatus ( uint32_t  ui32Base)

Gets the current FIFO status.

Parameters
ui32Baseis the base address of the I2C module.

This function retrieves the status for both the transmit (TX) and receive (RX) FIFOs. The trigger level for the transmit FIFO is set using I2CTxFIFOConfigSet() and for the receive FIFO using I2CTxFIFOConfigSet().

Returns
Returns the FIFO status, enumerated as a bit field containing I2C_FIFO_RX_BELOW_TRIG_LEVEL, I2C_FIFO_RX_FULL, I2C_FIFO_RX_EMPTY, I2C_FIFO_TX_BELOW_TRIG_LEVEL, I2C_FIFO_TX_FULL, and I2C_FIFO_TX_EMPTY.

References ASSERT, HWREG, and I2C_O_FIFOSTATUS.

§ I2CFIFODataPut()

void I2CFIFODataPut ( uint32_t  ui32Base,
uint8_t  ui8Data 
)

Writes a data byte to the I2C transmit FIFO.

Parameters
ui32Baseis the base address of the I2C module.
ui8Datais the data to be placed into the transmit FIFO.

This function adds a byte of data to the I2C transmit FIFO. If there is no space available in the FIFO, this function waits for space to become available before returning.

Returns
None.

References ASSERT, HWREG, I2C_FIFOSTATUS_TXFF, I2C_O_FIFODATA, and I2C_O_FIFOSTATUS.

§ I2CFIFODataPutNonBlocking()

uint32_t I2CFIFODataPutNonBlocking ( uint32_t  ui32Base,
uint8_t  ui8Data 
)

Writes a data byte to the I2C transmit FIFO.

Parameters
ui32Baseis the base address of the I2C module.
ui8Datais the data to be placed into the transmit FIFO.

This function adds a byte of data to the I2C transmit FIFO. If there is no space available in the FIFO, this function returns a zero.

Returns
The number of elements added to the I2C transmit FIFO.

References ASSERT, HWREG, I2C_FIFOSTATUS_TXFF, I2C_O_FIFODATA, and I2C_O_FIFOSTATUS.

§ I2CFIFODataGet()

uint32_t I2CFIFODataGet ( uint32_t  ui32Base)

Reads a byte from the I2C receive FIFO.

Parameters
ui32Baseis the base address of the I2C module.

This function reads a byte of data from I2C receive FIFO and places it in the location specified by the pui8Data parameter. If there is no data available, this function waits until data is received before returning.

Returns
The data byte.

References ASSERT, HWREG, I2C_FIFOSTATUS_RXFE, I2C_O_FIFODATA, and I2C_O_FIFOSTATUS.

§ I2CFIFODataGetNonBlocking()

uint32_t I2CFIFODataGetNonBlocking ( uint32_t  ui32Base,
uint8_t *  pui8Data 
)

Reads a byte from the I2C receive FIFO.

Parameters
ui32Baseis the base address of the I2C module.
pui8Datais a pointer where the read data is stored.

This function reads a byte of data from I2C receive FIFO and places it in the location specified by the pui8Data parameter. If there is no data available, this functions returns 0.

Returns
The number of elements read from the I2C receive FIFO.

References ASSERT, HWREG, I2C_FIFOSTATUS_RXFE, I2C_O_FIFODATA, and I2C_O_FIFOSTATUS.

§ I2CMasterBurstLengthSet()

void I2CMasterBurstLengthSet ( uint32_t  ui32Base,
uint8_t  ui8Length 
)

Set the burst length for a I2C master FIFO operation.

Parameters
ui32Baseis the base address of the I2C module.
ui8Lengthis the length of the burst transfer.

This function configures the burst length for a I2C Master FIFO operation. The burst field is limited to 8 bits or 256 bytes. The burst length applies to a single I2CMCS BURST operation meaning that it specifies the burst length for only the current operation (can be TX or RX). Each burst operation must configure the burst length prior to writing the BURST bit in the I2CMCS using I2CMasterControl().

Returns
None.

References ASSERT, HWREG, and I2C_O_MBLEN.

§ I2CMasterBurstCountGet()

uint32_t I2CMasterBurstCountGet ( uint32_t  ui32Base)

Returns the current value of the burst transfer counter.

Parameters
ui32Baseis the base address of the I2C module.

This function returns the current value of the burst transfer counter that is used by the FIFO mechanism. Software can use this value to determine how many bytes remain in a transfer, or where in the transfer the burst operation was if an error has occurred.

Returns
None.

References ASSERT, HWREG, and I2C_O_MBCNT.

§ I2CMasterGlitchFilterConfigSet()

void I2CMasterGlitchFilterConfigSet ( uint32_t  ui32Base,
uint32_t  ui32Config 
)

Configures the I2C Master glitch filter.

Parameters
ui32Baseis the base address of the I2C module.
ui32Configis the glitch filter configuration.

This function configures the I2C Master glitch filter. The value passed in to ui32Config determines the sampling range of the glitch filter, which is configurable between 1 and 32 system clock cycles. The default configuration of the glitch filter is 0 system clock cycles, which means that it's disabled.

The ui32Config field should be any of the following values:

  • I2C_MASTER_GLITCH_FILTER_DISABLED
  • I2C_MASTER_GLITCH_FILTER_1
  • I2C_MASTER_GLITCH_FILTER_2
  • I2C_MASTER_GLITCH_FILTER_3
  • I2C_MASTER_GLITCH_FILTER_4
  • I2C_MASTER_GLITCH_FILTER_8
  • I2C_MASTER_GLITCH_FILTER_16
  • I2C_MASTER_GLITCH_FILTER_32
Returns
None.

References ASSERT, HWREG, and I2C_O_MTPR.

§ I2CSlaveFIFOEnable()

void I2CSlaveFIFOEnable ( uint32_t  ui32Base,
uint32_t  ui32Config 
)

Enables FIFO usage for the I2C Slave.

Parameters
ui32Baseis the base address of the I2C module.
ui32Configis the desired FIFO configuration of the I2C Slave.

This function configures the I2C Slave to use the FIFO(s). This function should be used in combination with I2CTxFIFOConfigSet() and/or I2CRxFIFOConfigSet(), which configure the FIFO trigger level and tell the FIFO hardware whether to interact with the I2C Master or Slave. The application appropriate combination of I2C_SLAVE_TX_FIFO_ENABLE and I2C_SLAVE_RX_FIFO_ENABLE should be passed in to the ui32Config field.

The Slave I2CSCSR register is write-only, so any call to I2CSlaveEnable(), I2CSlaveDisable or I2CSlaveFIFOEnable() overwrites the slave configuration. Therefore, application software should call I2CSlaveEnable() followed by I2CSlaveFIFOEnable() with the desired FIFO configuration.

Returns
None.

References ASSERT, HWREG, I2C_O_SCSR, and I2C_SCSR_DA.

§ I2CSlaveFIFODisable()

void I2CSlaveFIFODisable ( uint32_t  ui32Base)

Disable FIFO usage for the I2C Slave.

Parameters
ui32Baseis the base address of the I2C module.

This function disables the FIFOs for the I2C Slave. After calling this this function, the FIFOs are disabled, but the Slave remains active.

Returns
None.

References ASSERT, HWREG, I2C_O_SCSR, and I2C_SCSR_DA.

§ I2CLoopbackEnable()

void I2CLoopbackEnable ( uint32_t  ui32Base)

Enables internal loopback mode for an I2C port.

Parameters
ui32Baseis the base address of the I2C module.

This function configures an I2C port in internal loopback mode to help with diagnostics and debug. In this mode, the SDA and SCL signals from master and slave modules are internally connected. This allows data to be transferred between the master and slave modules of the same I2C port, without having to go through I/O's. I2CMasterDataPut(), I2CSlaveDataPut(), I2CMasterDataGet(),I2CSlaveDataGet() can be used along with this function.

Returns
None.

References ASSERT, HWREG, I2C_MCR_LPBK, and I2C_O_MCR.

Copyright 2018, Texas Instruments Incorporated