Texas Instruments Tiva TM4C123GH6PM, User Manual

Page: 58 / 352

Controller Area Network (CAN)
6.2.1.5 ROM_CANEnable
Enables the CAN controller.
Prototype:
void
ROM_CANEnable(uint32_t ui32Base)
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_CANEnable
is a function pointer located at
ROM_CANTABLE[2]
.
Parameters:
ui32Base is the base address of the CAN controller to enable.
Description:
Enables the CAN controller for message processing. Once enabled, the controller will auto-
matically transmit any pending frames, and process any received frames. The controller can be
stopped by calling
ROM_CANDisable() . Prior to calling ROM_CANEnable() , ROM_CANInit()
should have been called to initialize the controller and the CAN bus clock should be configured
by calling
ROM_CANBitTimingSet() .
Returns:
None.
6.2.1.6 ROM_CANErrCntrGet
Reads the CAN controller error counter register.
Prototype:
bool
ROM_CANErrCntrGet(uint32_t ui32Base,
uint32_t *pui32RxCount,
uint32_t *pui32TxCount)
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_CANErrCntrGet
is a function pointer located at
ROM_CANTABLE[15]
.
Parameters:
ui32Base is the base address of the CAN controller.
pui32RxCount is a pointer to storage for the receive error counter.
pui32TxCount is a pointer to storage for the transmit error counter.
Description:
Reads the error counter register and returns the transmit and receive error counts to the caller
along with a flag indicating if the controller receive counter has reached the error passive
limit. The values of the receive and transmit error counters are returned through the pointers
provided as parameters.
After this call, ∗ pui32RxCount will hold the current receive error count and ∗ pui32TxCount will
hold the current transmit error count.
58 April 8, 2013