The functions in the Analog Comparator (AC) synchronous driver will block (i.e. not return) until the operation is done.
The comparison result can be get by ac_sync_get_result, if the return is not ERR_NOT_READY then it's the result of voltage comparison for two input channels.
Initialize and deinitialize the driver and associated hardware
Enable or disable the AC comparator
Start single-short comparison if signal-shot mode is enabled (no need to start for continuous sampling mode)
Read back the comparison result
Select positive and negative input for the AC comparator
Select single shot or continuous measurement mode
Filter length and hysteresis setting, etc.
Run in Standby or Debug mode
Various aspects of Event control
After AC hardware initialization, the comparison result can be get by ac_sync_get_result. If the AC hardware is configured to single-shot mode, then ac_sync_start_comparison is needed to start conversion, otherwise the comparator is continuously enabled and performing comparisons.
The following shows a simple example of using the AC. The AC must have been initialized by ac_sync_init. This initialization will configure the operation of the AC, such as input pins, single-shot, or continuous measurement mode, etc.
The example enables comparator 0 of AC, and finally starts a voltage comparison on this comparator.
/**
* Example of using AC_0 to compare the voltage level.
*/
void AC_0_example(void)
{
int32_t cmp_result;
ac_sync_enable(&AC_0);
ac_sync_start_comparison(&AC_0, 0);
while (true) {
cmp_result = ac_sync_get_result(&AC_0, 0);
}
}
The AC peripheral and its related I/O lines and clocks