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More SAMD timer setup

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This commit is contained in:
pmantoine 2022-04-08 10:59:30 +08:00
parent 083c5b5cd3
commit 084ddf01e1
2 changed files with 34 additions and 18 deletions
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2
DCCTimerMEGAAVR.cpp
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@ -75,7 +75,7 @@ extern char *__malloc_heap_start;
// ISR called by timer interrupt every 58uS
ISR(TCB0_INT_vect){
TCB0.INTFLAGS = TCB_CAPT_bm;
TCB0.INTFLAGS = TCB_CAPT_bm; // Clear interrupt request flag
interruptHandler();
}

50
DCCTimerSAMD.cpp
View File

@ -36,18 +36,7 @@ INTERRUPT_CALLBACK interruptHandler=0;
void DCCTimer::begin(INTERRUPT_CALLBACK callback) {
interruptHandler=callback;
// PMA - SAMC used on Firebox has 2 ADCs, so choose which to set up based on pin being used
// TODO: this code will need to be fixed - ADCpin is not in scope... as this is stolen from
// the abandoned rf24 branch
#if defined(ARDUINO_ARCH_SAMC)
Adc* ADC;
if ( (g_APinDescription[ADCpin].ulPeripheralAttribute & PER_ATTR_ADC_MASK) == PER_ATTR_ADC_STD ) {
ADC = ADC0;
} else {
ADC = ADC1;
}
#endif
noInterrupts();
// PMA - Set up ADC to do faster reads... default for Arduino Zero platform configs is 436uS,
// and we need sub-100uS. This code sets it to a read speed of around 21uS, and enables 12-bit
@ -80,20 +69,47 @@ void DCCTimer::begin(INTERRUPT_CALLBACK callback) {
4 << GCLK_CLKCTRL_GEN_Pos | // Apply to GCLK4
GCLK_CLKCTRL_ID_TCC0_TCC1; // Feed GCLK to TCC0/1
while (GCLK->STATUS.bit.SYNCBUSY);
// PMA - assume we're using TCC0
REG_GCLK_GENDIV = GCLK_GENDIV_DIV(1) | // Divide 48MHz by 1
GCLK_GENDIV_ID(4); // Apply to GCLK4
while (GCLK->STATUS.bit.SYNCBUSY); // Wait for synchronization
REG_GCLK_GENCTRL = GCLK_GENCTRL_GENEN | // Enable GCLK
GCLK_GENCTRL_SRC_DFLL48M | // Set the 48MHz clock source
GCLK_GENCTRL_ID(4); // Select GCLK4
while (GCLK->STATUS.bit.SYNCBUSY); // Wait for synchronization
REG_GCLK_CLKCTRL = GCLK_CLKCTRL_CLKEN | // Enable generic clock
4 << GCLK_CLKCTRL_GEN_Pos | // Apply to GCLK4
GCLK_CLKCTRL_ID_TCC0_TCC1; // Feed GCLK to TCC0/1
while (GCLK->STATUS.bit.SYNCBUSY); // Wait for synchronization
TCC0->WAVE.reg = TCC_WAVE_WAVEGEN_NPWM; // Select NPWM as waveform
while (TCC0->SYNCBUSY.bit.WAVE); // Wait for sync
TCC0->INTENSET.reg = TCC_INTENSET_OVF; // Interrupt on overflow
NVIC_EnableIRQ((IRQn_Type)TCC0_IRQn); // Enable the interrupt
interrupts();
}
// PMA - IRQ handler copied from rf24 branch
// TODO: test
void TCC0_Handler() {
if(TCC0->INTFLAG.bit.OVF) {
TCC0->INTFLAG.bit.OVF = 1;
interruptHandler();
}
}
bool DCCTimer::isPWMPin(byte pin) {
//SAMD: digitalPinHasPWM, todo
//TODO: SAMD digitalPinHasPWM
(void) pin;
return false; // TODO what are the relevant pins?
}
void DCCTimer::setPWM(byte pin, bool high) {
// TODO what are the relevant pins?
// TODO: what are the relevant pins?
(void) pin;
(void) high;
}