Good morning I would like to adapt the following part of code wrote for Arduino UNO in order to make it works on Arduino DUE, but I'm not able to find the corresponding register in Arduino DUE:
void setup() {
// put your setup code here, to run once:
TIMSK1 &= ~(1<<TOIE1); //disable register del timer 1
TCCR1A &= ~((1<<WGM11) | (1<<WGM10));
TCCR1B &= ~((1<<WGM12) | (1<<WGM13)); //WGM10 = WGM11 = WGM12 = WGM13 = 0 : “Normal” timer
TIMSK1 &= ~(1<<OCIE1A); //Timer 1 interrupt in case of overflow
TCCR1B |= (1<<CS10); // set "1" in CS11
TCCR1B &= ~((1<<CS12)|(1<<CS11)); // set 0 in CS12 e CS10 //pre scaler 8
TCNT1H = 0xC1;
TCNT1L = 0x81; //initializing counter
TIMSK1 |= (1<<TOIE1); //set interrupt
Serial.begin(9600);
pinMode(pin, OUTPUT);
}
ISR(TIMER1_OVF_vect){ // 1000 Hz
TCNT1H = 0xC1;
TCNT1L = 0x81; //initializing counter
}
Time for the Tech Reference Manual; and since the architecture is very different, direct comparison of "names" will not exist. My guess is that you will need to dig-into the Arduino core to understand how functions are related.
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I try looking at the datasheet and some example to write this code, but is not working:
'''
void tc_setup()
{
PMC->PMC_PCER1 = PMC_PCER1_PID35; // TC8 power ON : Timer Counter 2 channel 2 IS TC8
PIOD->PIO_PDR = PIO_PDR_P7 // pin is controlled by the corresponding peripheral not by the PIO Controller. The pin is no more driven by GPIO
| PIO_PDR_P8;
PIOD->PIO_ABSR |= PIO_PD7B_TIOA8 //Set TIOA8 and TIOB0 to the peripheral
| PIO_PD8B_TIOB8;
TC2->TC_CHANNEL[2].TC_CMR = TC_CMR_TCCLKS_TIMER_CLOCK1 //MCK/2, clk on rising edge
| TC_CMR_EEVT_XC2 //TIOB in output
| TC_CMR_WAVE //Waveform mode
| TC_CMR_WAVSEL_UP //UP mode with automatic trigger on RC Compare
| TC_CMR_BCPB_SET //Set TIOB on RB compare match
| TC_CMR_BCPC_CLEAR //Clear TIOB on RC compare match
| TC_CMR_ACPA_CLEAR //Clear TIOA on RA compare match
| TC_CMR_ACPC_SET; //Set TIOA on RC compare match
//MIO CASO
// (84MHz/2)= 42000000
// 1/42000000 = 0.00000000...
// 0.001/0.000000... = 42000 (periodo richiesto 1ms)
//( (2^32) - 42000 + 1 = 4294963097 ) --> in caso di overflow
TC2->TC_CHANNEL[2].TC_RC = 42000; //TIOA8 Frequency = Mck/2/TC_RC <-- step che vogliamo fare
TC2->TC_CHANNEL[2].TC_RA = 21000; //Any Duty cycle in between 1 and TC_RC
TC2->TC_CHANNEL[2].TC_RB = 21000; //Any Duty cycle in between 1 and TC_RC
TC2->TC_CHANNEL[2].TC_IER = TC_IER_COVFS; // Interrupt on RC compare match
NVIC_EnableIRQ(TC8_IRQn);
TC2->TC_CHANNEL[2].TC_CV = 4294963097; //The current value of the counter is accessible in real time by reading the TC Counter Value Register (TC_CV)
TC2->TC_CHANNEL[2].TC_CCR = TC_CCR_SWTRG | TC_CCR_CLKEN; // Software trigger TC8 counter and enable
}
// ISR(TC2_SR2_COVFS){ //should I use this in some way?
void TC8_Handler() {
TC2->TC_CHANNEL[2].TC_CV = 4294963097; // Read and clear status register
PIOB->PIO_ODSR ^= PIO_ODSR_P27; // Toggle LED every 1 Hz
}
'''
Create a function called int sysTickHook(), and it should get called every millisecond.
return 0 if you want to run the normal millis() timing function as well.
Unlike the AVR's periodic interrupt, the Due's:
Occurs at exactly 1kHz
has this "hook" capability for inserting a user function.
I wouldn't like to set it just at 1 kHz, but I would like to make it works in order to change the start parameter of the register every time depending on the required frequency. millis is not that accurate as the interrupt.
See