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Initial STM32F4xx fast ADC read implementation

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pmantoine
2023-01-28 13:58:55 +08:00
parent fcf16c1367
commit 6cc66e26c1
5 changed files with 136 additions and 30 deletions
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19
DCCTimerSAMD.cpp
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@@ -168,23 +168,6 @@ int ADCee::init(uint8_t pin) {
if (id > NUM_ADC_INPUTS)
return -1023;
// Dummy read using Arduino library
analogReadResolution(12);
value = analogRead(pin);
// Reconfigure ADC
ADC->CTRLA.bit.ENABLE = 0; // disable ADC
while( ADC->STATUS.bit.SYNCBUSY == 1 ); // wait for synchronization
ADC->CTRLB.reg &= 0b1111100011001111; // mask PRESCALER and RESSEL bits
ADC->CTRLB.reg |= ADC_CTRLB_PRESCALER_DIV64 | // divide Clock by 16
ADC_CTRLB_RESSEL_12BIT; // Result 12 bits, 10 bits possible
ADC->AVGCTRL.reg = ADC_AVGCTRL_SAMPLENUM_1 | // take 1 sample at a time
ADC_AVGCTRL_ADJRES(0x00ul); // adjusting result by 0
ADC->SAMPCTRL.reg = 0x00ul; // sampling Time Length = 0
ADC->CTRLA.bit.ENABLE = 1; // enable ADC
while( ADC->STATUS.bit.SYNCBUSY == 1 ); // wait for synchronization
// Permanently configure SAMD IO MUX for that pin
pinPeripheral(pin, PIO_ANALOG);
ADC->INPUTCTRL.bit.MUXPOS = g_APinDescription[pin].ulADCChannelNumber; // Selection for the positive ADC input
@@ -205,9 +188,11 @@ int ADCee::init(uint8_t pin) {
return value;
}
int16_t ADCee::ADCmax() {
return 4095;
}
/*
* Read function ADCee::read(pin) to get value instead of analogRead(pin)
*/