Texas Instruments Tiva TM4C123GH6PM, User Manual

Page: 60 / 352

Controller Area Network (CAN)
CAN_INT_INTID_STATUS - Clears a status interrupt.
1-32 - Clears the specified message object interrupt
It is not necessary to use this function to clear an interrupt. This should only be used if the
application wants to clear an interrupt source without taking the normal interrupt action.
Normally, the status interrupt is cleared by reading the controller status using
ROM_CANStatusGet() . A specific message object interrupt is normally cleared by reading
the message object using ROM_CANMessageGet() .
Note:
Because there is a write buffer in the Cortex-M4 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.
6.2.1.9 ROM_CANIntDisable
Disables individual CAN controller interrupt sources.
Prototype:
void
ROM_CANIntDisable(uint32_t ui32Base,
uint32_t ui32IntFlags)
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_CANIntDisable
is a function pointer located at
ROM_CANTABLE[11]
.
Parameters:
ui32Base is the base address of the CAN controller.
ui32IntFlags
is the bit mask of the interrupt sources to be disabled.
Description:
Disables the specified CAN controller interrupt sources. Only enabled interrupt sources can
cause a processor interrupt.
The ui32IntFlags parameter has the same definition as in the ROM_CANIntEnable() function.
Returns:
None.
6.2.1.10 ROM_CANIntEnable
Enables individual CAN controller interrupt sources.
60 April 8, 2013