euart.c File Reference

#include "inc/hw_types.h"
#include "driverlib/5xx_6xx/debug.h"
#include "driverlib/5xx_6xx/euart.h"
#include "driverlib/5xx_6xx/euart_baudrate.h"
#include "deprecated/CCS/msp430xgeneric.h"

Functions
unsigned short	eUART_init (unsigned int baseAddress, unsigned char selectClockSource, unsigned long clockSourceFrequency, unsigned long desiredUartBaudRate, unsigned char parity, unsigned char msborLsbFirst, unsigned char numberofStopBits, unsigned char uartMode, unsigned short overSampling)
unsigned short	eUART_initAdvance (unsigned int baseAddress, unsigned char selectClockSource, unsigned int clockPrescalar, unsigned char firstModReg, unsigned char secondModReg, unsigned char parity, unsigned char msborLsbFirst, unsigned char numberofStopBits, unsigned char uartMode, unsigned short overSampling)
void	eUART_transmitData (unsigned int baseAddress, unsigned char transmitData)
unsigned char	eUART_receiveData (unsigned int baseAddress)
void	eUART_enableInterrupt (unsigned int baseAddress, unsigned char mask)
void	eUART_disableInterrupt (unsigned int baseAddress, unsigned char mask)
unsigned char	eUART_getInterruptStatus (unsigned int baseAddress, unsigned char mask)
void	eUART_clearInterruptFlag (unsigned int baseAddress, unsigned char mask)
void	eUART_enable (unsigned int baseAddress)
void	eUART_disable (unsigned int baseAddress)
unsigned char	eUART_queryStatusFlags (unsigned int baseAddress, unsigned char mask)
void	eUART_setDormant (unsigned int baseAddress)
void	eUART_resetDormant (unsigned int baseAddress)
void	eUART_transmitAddress (unsigned int baseAddress, unsigned char transmitAddress)
void	eUART_transmitBreak (unsigned int baseAddress)
unsigned long	eUART_getReceiveBufferAddressForDMA (unsigned int baseAddress)
unsigned long	eUART_getTransmitBufferAddressForDMA (unsigned int baseAddress)
void	eUART_selectDeglitchTime (unsigned int baseAddress, unsigned long deglitchTime)

---

Function Documentation

unsigned short eUART_init	(	unsigned int	baseAddress,
		unsigned char	selectClockSource,
		unsigned long	clockSourceFrequency,
		unsigned long	desiredUartBaudRate,
		unsigned char	parity,
		unsigned char	msborLsbFirst,
		unsigned char	numberofStopBits,
		unsigned char	uartMode,
		unsigned short	overSampling
	)

Initializes the UART block.

Parameters:

baseAddress	is the base address of the UART module.
selectClockSource	selects Clock source. Valid values are eUART_CLOCKSOURCE_SMCLK eUART_CLOCKSOURCE_ACLK
clockSourceFrequency	is the frequency of the slected clock source
desiredUartClock	is the desired clock rate for UART communication
parity	is the desired parity. Valid values are eUART_NO_PARITY [Default Value], eUART_ODD_PARITY, eUART_EVEN_PARITY
msborLsbFirst	controls direction of receive and transmit shift register. Valid values are eUART_MSB_FIRST eUART_LSB_FIRST [Default Value]
numberofStopBits	indicates one/two STOP bits Valid values are eUART_ONE_STOP_BIT [Default Value] eUART_TWO_STOP_BITS
uartMode	selects the mode of operation Valid values are eUART_MODE [Default Value], eUART_IDLE_LINE_MULTI_PROCESSOR_MODE, eUART_ADDRESS_BIT_MULTI_PROCESSOR_MODE, eUART_AUTOMATIC_BAUDRATE_DETECTION_MODE
overSampling	indicates low frequency or oversampling baud generation Valid values are eUART_OVERSAMPLING_BAUDRATE_GENERATION eUART_LOW_FREQUENCY_BAUDRATE_GENERATION

Upon successful initialization of the UART block, this function will have initialized the module, but the UART block still remains disabled and must be enabled with eUART_enable()

Modified bits are UCPEN, UCPAR, UCMSB, UC7BIT, UCSPB, UCMODEx, UCSYNC bits of UCAxCTL0 and UCSSELx, UCSWRST bits of UCAxCTL1

Returns:

STATUS_SUCCESS or STATUS_FAIL of the initialization process

References ASSERT, eUART_ADDRESS_BIT_MULTI_PROCESSOR_MODE, eUART_AUTOMATIC_BAUDRATE_DETECTION_MODE, eUART_CLOCKSOURCE_ACLK, eUART_CLOCKSOURCE_SMCLK, eUART_EVEN_PARITY, eUART_IDLE_LINE_MULTI_PROCESSOR_MODE, eUART_LSB_FIRST, eUART_MODE, eUART_MSB_FIRST, eUART_NO_PARITY, eUART_ODD_PARITY, eUART_ONE_STOP_BIT, eUART_TWO_STOP_BITS, eUARTBAUDRATE_calculateBaudDividers(), HWREG, STATUS_FAIL, and STATUS_SUCCESS.

unsigned short eUART_initAdvance	(	unsigned int	baseAddress,
		unsigned char	selectClockSource,
		unsigned int	clockPrescalar,
		unsigned char	firstModReg,
		unsigned char	secondModReg,
		unsigned char	parity,
		unsigned char	msborLsbFirst,
		unsigned char	numberofStopBits,
		unsigned char	uartMode,
		unsigned short	overSampling
	)

Advanced initialization routine for the UART block. The values to be written into the UCAxBRW and UCAxMCTLW registers should be pre-computed and passed into the initialization function

Parameters:

baseAddress	is the base address of the UART module.
selectClockSource	selects Clock source. Valid values are eUART_CLOCKSOURCE_SMCLK eUART_CLOCKSOURCE_ACLK
clockPrescalar	is the value to be written into UCBRx bits
firstModReg	is First modulation stage register setting. This value is a pre-calculated value which can be obtained from the Device User’s Guide.This value is written into UCBRFx bits of UCAxMCTLW.
secondModReg	is Second modulation stage register setting. This value is a pre-calculated value which can be obtained from the Device User’s Guide. This value is written into UCBRSx bits of UCAxMCTLW.
parity	is the desired parity. Valid values are eUART_NO_PARITY [Default Value], eUART_ODD_PARITY, eUART_EVEN_PARITY
msborLsbFirst	controls direction of receive and transmit shift register. Valid values are eUART_MSB_FIRST eUART_LSB_FIRST [Default Value]
numberofStopBits	indicates one/two STOP bits Valid values are eUART_ONE_STOP_BIT [Default Value] eUART_TWO_STOP_BITS
uartMode	selects the mode of operation Valid values are eUART_MODE [Default Value], eUART_IDLE_LINE_MULTI_PROCESSOR_MODE, eUART_ADDRESS_BIT_MULTI_PROCESSOR_MODE, eUART_AUTOMATIC_BAUDRATE_DETECTION_MODE
overSampling	indicates low frequency or oversampling baud generation Valid values are eUART_OVERSAMPLING_BAUDRATE_GENERATION eUART_LOW_FREQUENCY_BAUDRATE_GENERATION

Upon successful initialization of the UART block, this function will have initialized the module, but the UART block still remains disabled and must be enabled with eUART_enable()

Modified bits are UCPEN, UCPAR, UCMSB, UC7BIT, UCSPB, UCMODEx, UCSYNC bits of UCAxCTL0 and UCSSELx, UCSWRST bits of UCAxCTL1

Returns:

STATUS_SUCCESS or STATUS_FAIL of the initialization process

References ASSERT, eUART_ADDRESS_BIT_MULTI_PROCESSOR_MODE, eUART_AUTOMATIC_BAUDRATE_DETECTION_MODE, eUART_CLOCKSOURCE_ACLK, eUART_CLOCKSOURCE_SMCLK, eUART_EVEN_PARITY, eUART_IDLE_LINE_MULTI_PROCESSOR_MODE, eUART_LSB_FIRST, eUART_MODE, eUART_MSB_FIRST, eUART_NO_PARITY, eUART_ODD_PARITY, eUART_ONE_STOP_BIT, eUART_TWO_STOP_BITS, HWREG, and STATUS_SUCCESS.

void eUART_transmitData	(	unsigned int	baseAddress,
		unsigned char	transmitData
	)

Transmits a byte from the UART Module.

Parameters:

baseAddress	is the base address of the UART module.
transmitData	data to be transmitted from the UART module

This function will place the supplied data into UART trasmit data register to start transmission

Modified register is UCAxTXBUF

Returns:

None.

References HWREG.

unsigned char eUART_receiveData

(

unsigned int

baseAddress

)

Receives a byte that has been sent to the UART Module.

Parameters:

baseAddress

is the base address of the UART module.

This function reads a byte of data from the UART receive data Register.

Modified register is UCAxRXBUF

Returns:

Returns the byte received from by the UART module, cast as an unsigned char.

References HWREG.

void eUART_enableInterrupt	(	unsigned int	baseAddress,
		unsigned char	mask
	)

Enables individual UART interrupt sources.

Parameters:

baseAddress	is the base address of the UART module.
mask	is the bit mask of the interrupt sources to be enabled.

Enables the indicated UART interrupt sources. The interrupt flag is first and then the corresponfing interrupt is enabled. Only the sources that are enabled can be reflected to the processor interrupt; disabled sources have no effect on the processor.

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

• eUART_RECEIVE_INTERRUPT -Receive interrupt
• eUART_TRANSMIT_INTERRUPT - Transmit interrupt
• eUART_RECEIVE_ERRONEOUSCHAR_INTERRUPT - Receive erroneous-character interrupt enable
• eUART_BREAKCHAR_INTERRUPT - Receive break character interrupt enable

Modified register is UCAxIFG, UCAxIE and UCAxCTL1

Returns:

None.

References ASSERT, eUART_BREAKCHAR_INTERRUPT, eUART_RECEIVE_ERRONEOUSCHAR_INTERRUPT, eUART_RECEIVE_INTERRUPT, eUART_TRANSMIT_INTERRUPT, and HWREG.

void eUART_disableInterrupt	(	unsigned int	baseAddress,
		unsigned char	mask
	)

Disables individual UART interrupt sources.

Parameters:

baseAddress	is the base address of the UART module.
mask	is the bit mask of the interrupt sources to be disabled.

Disables the indicated UART interrupt sources. Only the sources that are enabled can be reflected to the processor interrupt; disabled sources have no effect on the processor.

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

• eUART_RECEIVE_INTERRUPT -Receive interrupt
• eUART_TRANSMIT_INTERRUPT - Transmit interrupt
• eUART_RECEIVE_ERRONEOUSCHAR_INTERRUPT - Receive erroneous-character interrupt enable
• eUART_BREAKCHAR_INTERRUPT - Receive break character interrupt enable

Modified register is UCAxIFG, UCAxIE and UCAxCTL1

Returns:

None.

References ASSERT, eUART_BREAKCHAR_INTERRUPT, eUART_RECEIVE_ERRONEOUSCHAR_INTERRUPT, eUART_RECEIVE_INTERRUPT, eUART_TRANSMIT_INTERRUPT, and HWREG.

unsigned char eUART_getInterruptStatus	(	unsigned int	baseAddress,
		unsigned char	mask
	)

Gets the current UART interrupt status.

Parameters:

baseAddress	is the base address of the UART module.
mask	is the masked interrupt flag status to be returned.

This returns the interrupt status for the UART module based on which flag is passed. mask parameter can be either any of the following selection.

• eUART_RECEIVE_INTERRUPT_FLAG -Receive interrupt flag
• eUART_TRANSMIT_INTERRUPT_FLAG - Transmit interrupt flag

Modified register is UCAxIFG.

Returns:

The current interrupt status, returned as with the respective bits set if the corresponding interrupt flag is set

References ASSERT, eUART_RECEIVE_INTERRUPT_FLAG, eUART_TRANSMIT_INTERRUPT_FLAG, and HWREG.

Referenced by eUART_transmitBreak().

void eUART_clearInterruptFlag	(	unsigned int	baseAddress,
		unsigned char	mask
	)

Clears UART interrupt sources.

Parameters:

baseAddress	is the base address of the UART module.
mask	is a bit mask of the interrupt sources to be cleared.

The UART interrupt source is cleared, so that it no longer asserts. The highest interrupt flag is automatically cleared when an interrupt vector generator is used.

The mask parameter has the same definition as the mask parameter to eUART_enableInterrupt().

Modified register is UCAxIFG

Returns:

None.

References HWREG.

void eUART_enable

(

unsigned int

baseAddress

)

Enables the UART block.

Parameters:

baseAddress

is the base address of the USCI UART module.

This will enable operation of the UART block.

Modified register is UCAxCTL1

Returns:

None.

References HWREG.

void eUART_disable

(

unsigned int

baseAddress

)

Disables the UART block.

Parameters:

baseAddress

is the base address of the USCI UART module.

This will disable operation of the UART block.

Modified register is UCAxCTL1

Returns:

None.

References HWREG.

unsigned char eUART_queryStatusFlags	(	unsigned int	baseAddress,
		unsigned char	mask
	)

Gets the current UART status flags.

Parameters:

baseAddress	is the base address of the UART module.
mask	is the masked interrupt flag status to be returned.

This returns the status for the UART module based on which flag is passed. mask parameter can be either any of the following selection.

• eUART_LISTEN_ENABLE
• eUART_FRAMING_ERROR
• eUART_OVERRUN_ERROR
• eUART_PARITY_ERROR
• UARTBREAK_DETECT
• eUART_RECEIVE_ERROR
• eUART_ADDRESS_RECEIVED
• eUART_IDLELINE
• eUART_BUSY

Modified register is UCAxSTAT

Returns:

the masked status flag

References ASSERT, eUART_ADDRESS_RECEIVED, eUART_BUSY, eUART_FRAMING_ERROR, eUART_IDLELINE, eUART_LISTEN_ENABLE, eUART_OVERRUN_ERROR, eUART_PARITY_ERROR, eUART_RECEIVE_ERROR, HWREG, and UARTBREAK_DETECT.

void eUART_setDormant

(

unsigned int

baseAddress

)

Sets the UART module in dormant mode

Parameters:

baseAddress

is the base address of the UART module.

Puts USCI in sleep mode Only characters that are preceded by an idle-line or with address bit set UCRXIFG. In UART mode with automatic baud-rate detection, only the combination of a break and synch field sets UCRXIFG.

Modified register is UCAxCTL1

Returns:

None.

References HWREG.

void eUART_resetDormant

(

unsigned int

baseAddress

)

Re-enables UART module from dormant mode

Parameters:

baseAddress

is the base address of the UART module.

Not dormant. All received characters set UCRXIFG.

Modified bits are UCDORM of UCAxCTL1 register.

Returns:

None.

References HWREG.

void eUART_transmitAddress	(	unsigned int	baseAddress,
		unsigned char	transmitAddress
	)

Transmits the next byte to be transmitted marked as address depending on selected multiprocessor mode

Parameters:

baseAddress	is the base address of the UART module.
transmitAddress	is the next byte to be transmitted

Modified register is UCAxCTL1, UCAxTXBUF

Returns:

None.

References HWREG.

void eUART_transmitBreak

(

unsigned int

baseAddress

)

Transmit break. Transmits a break with the next write to the transmit buffer. In UART mode with automatic baud-rate detection, eUART_AUTOMATICBAUDRATE_SYNC(0x55) must be written into UCAxTXBUF to generate the required break/synch fields. Otherwise, DEFAULT_SYNC(0x00) must be written into the transmit buffer. Also ensures module is ready for transmitting the next data

Parameters:

baseAddress

is the base address of the UART module.

Modified register is UCAxCTL1, UCAxTXBUF

Returns:

None.

References DEFAULT_SYNC, eUART_AUTOMATIC_BAUDRATE_DETECTION_MODE, eUART_AUTOMATICBAUDRATE_SYNC, eUART_getInterruptStatus(), and HWREG.

unsigned long eUART_getReceiveBufferAddressForDMA

(

unsigned int

baseAddress

)

Returns the address of the RX Buffer of the UART for the DMA module.

Parameters:

baseAddress

is the base address of the UART module.

Returns the address of the UART RX Buffer. This can be used in conjunction with the DMA to store the received data directly to memory.

Returns:

None

unsigned long eUART_getTransmitBufferAddressForDMA

(

unsigned int

baseAddress

)

Returns the address of the TX Buffer of the UART for the DMA module.

Parameters:

baseAddress

is the base address of the UART module.

Returns the address of the UART TX Buffer. This can be used in conjunction with the DMA to obtain transmitted data directly from memory.

Returns:

None

void eUART_selectDeglitchTime	(	unsigned int	baseAddress,
		unsigned long	deglitchTime
	)

Sets the deglitch time

Parameters:

baseAddress	is the base address of the UART module.
deglitchTime	is the selected deglitch time Valid values are eUART_DEGLITCH_TIME_2ns eUART_DEGLITCH_TIME_50ns eUART_DEGLITCH_TIME_100ns eUART_DEGLITCH_TIME_200ns

Returns the address of the UART TX Buffer. This can be used in conjunction with the DMA to obtain transmitted data directly from memory.

Returns:

None

References ASSERT, eUART_DEGLITCH_TIME_100ns, eUART_DEGLITCH_TIME_200ns, eUART_DEGLITCH_TIME_2ns, eUART_DEGLITCH_TIME_50ns, and HWREG.