/**
* Configure a specific adc.
*/
void adc_config(uint32_t adc, const uint8_t const *channel_array)
{
adc_enable_scan_mode(adc);
adc_set_continuous_conversion_mode(adc);
adc_set_right_aligned(adc);
adc_enable_external_trigger_regular(adc, ADC_CR2_EXTSEL_SWSTART);
adc_set_sample_time_on_all_channels(adc, ADC_SAMPLE_TIME);
adc_enable_dma(adc);
adc_power_on(adc);
{
int i;
/* Wait a bit for the adc to power on. */
for (i = 0; i < 800000; i++) {
__asm("nop");
}
}
adc_reset_calibration(adc);
adc_calibration(adc);
adc_set_regular_sequence(adc, ADC_RAW_SAMPLE_COUNT/2,
(uint8_t *)channel_array);
}
/**
* NOTE this is a state machine, but it expects to run often enough for millis()
* @param machine
* @param res
*/
void jack_run_task(volatile struct jacks_machine_t *machine, struct jacks_result_t *res)
{
res->ready = false;
if (!jack_connected(machine->jack)) {
return;
}
switch (machine->step) {
case jack_machine_step_off:
// is it time to do a reading yet?
if (millis() - 3000 > machine->last_read_millis) {
printf("switching power on: channel %u\n", (unsigned int) machine->jack->val_channel);
gpio_set(machine->jack->power_port, machine->jack->power_pin);
machine->step = jack_machine_step_powered;
machine->step_entry_millis = millis();
}
break;
case jack_machine_step_powered:
// have we been powered up long enough yet?
if (millis() - machine->jack->power_on_time_millis > machine->step_entry_millis) {
printf("power stable!\n");
machine->step = jack_machine_step_ready;
// not really necessary... machine->step_entry_millis = millis();
} else {
printf(".");
}
break;
case jack_machine_step_ready:
// TODO - this should actually start a dma sequence and go to a next step
// that decimates/averages and finally returns.
// ok! do a few readings and call it good
adc_disable_scan_mode(ADC1);
adc_set_single_conversion_mode(ADC1);
adc_set_sample_time_on_all_channels(ADC1, ADC_SMPR_SMP_28DOT5CYC);
//adc_set_single_channel(ADC1, machine->jack->val_channel);
adc_set_regular_sequence(ADC1, 1, (u8*)&(machine->jack->val_channel));
adc_enable_external_trigger_regular(ADC1, ADC_CR2_EXTSEL_SWSTART);
adc_start_conversion_regular(ADC1);
printf("ok, doing reading on channel!\n");
while(!adc_eoc(ADC1)) {
;
}
res->ready = true;
res->value = adc_read_regular(ADC1);
machine->last_value = res->value;
machine->last_read_millis = millis();
gpio_clear(machine->jack->power_port, machine->jack->power_pin);
machine->step = jack_machine_step_off;
break;
}
return;
}