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Controller Area Network (CAN)

void ROM_CANBitTimingGet (uint32_t ui32Base, tCANBitClkParms ∗psClkParms)

void ROM_CANBitTimingSet (uint32_t ui32Base, tCANBitClkParms ∗psClkParms)

void ROM_CANDisable (uint32_t ui32Base)

void ROM_CANEnable (uint32_t ui32Base)

bool ROM_CANErrCntrGet (uint32_t ui32Base, uint32_t ∗pui32RxCount, uint32_t

∗pui32TxCount)

void ROM_CANInit (uint32_t ui32Base)

void ROM_CANIntClear (uint32_t ui32Base, uint32_t ui32IntClr)

void ROM_CANIntDisable (uint32_t ui32Base, uint32_t ui32IntFlags)

void ROM_CANIntEnable (uint32_t ui32Base, uint32_t ui32IntFlags)

uint32_t ROM_CANIntStatus (uint32_t ui32Base, tCANIntStsReg eIntStsReg)

void ROM_CANMessageClear (uint32_t ui32Base, uint32_t ui32ObjID)

void ROM_CANMessageGet (uint32_t ui32Base, uint32_t ui32ObjID, tCANMsgObject

∗pMsgObject, bool bClrPendingInt)

void ROM_CANMessageSet (uint32_t ui32Base, uint32_t ui32ObjID, tCANMsgObject

∗pMsgObject, tMsgObjType eMsgType)

bool ROM_CANRetryGet (uint32_t ui32Base)

void ROM_CANRetrySet (uint32_t ui32Base, bool bAutoRetry)

uint32_t ROM_CANStatusGet (uint32_t ui32Base, tCANStsReg eStatusReg)

6.2.1 Function Documentation

6.2.1.1 ROM_CANBitRateSet

This function is used to set the CAN bit timing values to a nominal setting based on a desired bit

rate.

Prototype:

uint32_t

ROM_CANBitRateSet(uint32_t ui32Base,

uint32_t ui32SourceClock,

uint32_t ui32BitRate)

ROM Location:

ROM_APITABLE is an array of pointers located at 0x0100.0010.

ROM_CANTABLE is an array of pointers located at ROM_APITABLE[18].

ROM_CANBitRateSet is a function pointer located at ROM_CANTABLE[16].

Parameters:

ui32Base is the base address of the CAN controller.

ui32SourceClock is the system clock for the device in Hz.

ui32BitRate is the desired bit rate.

Description:

This function will set the CAN bit timing for the bit rate passed in the ui32BitRate parame-

ter based on the ui32SourceClock parameter. Since the CAN clock is based off of the sys-

tem clock the calling function should pass in the source clock rate either by retrieving it from

ROM_SysCtlClockGet() or using a speciﬁc value in Hz. The CAN bit timing is calculated as-

suming a minimal amount of propagation delay, which will work for most cases where the

April 8, 2013 55

Brand	Texas Instruments
Model	Tiva TM4C123GH6PM
Category	Microcontrollers
Language	English

Texas Instruments Tiva TM4C123GH6PM User Manual

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