Texas Instruments Tiva TM4C123GH6PM, User Manual

Page: 31 / 352

Analog Comparator
ROM Location:
ROM_APITABLE
is an array of pointers located at
0x0100.0010
.
ROM_COMPARATORTABLE
is an array of pointers located at
ROM_APITABLE[6]
.
ROM_ComparatorIntClear
is a function pointer located at
ROM_COMPARATORTABLE[0]
.
Parameters:
ui32Base is the base address of the comparator module.
ui32Comp is the index of the comparator.
Description:
The comparator interrupt is cleared, so that it no longer asserts. This function must be called in
the interrupt handler to keep the handler from being called again immediately upon exit. Note
that for a level-triggered interrupt, the interrupt cannot be cleared until it stops asserting.
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.
4.2.1.3 ROM_ComparatorIntDisable
Disables the comparator interrupt.
Prototype:
void
ROM_ComparatorIntDisable(uint32_t ui32Base,
uint32_t ui32Comp)
ROM Location:
ROM_APITABLE
is an array of pointers located at
0x0100.0010
.
ROM_COMPARATORTABLE
is an array of pointers located at
ROM_APITABLE[6]
.
ROM_ComparatorIntDisable
is a function pointer located at
ROM_COMPARATORTABLE[5]
.
Parameters:
ui32Base is the base address of the comparator module.
ui32Comp
is the index of the comparator.
Description:
This function disables generation of an interrupt from the specified comparator. Only compara-
tors whose interrupts are enabled can be reflected to the processor.
Returns:
None.
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