Timer Interrupts on Due

system · April 14, 2013, 4:03pm

Using this code, you can set a timer for any of the ISRs TC0_Handler through TC8_Handler, see table of parameters below. It is possible to use the timers without a physically mapped pin, such as TC1 channel 0 (TC3_Handler) shown here:
volatile boolean l;

//TC1 ch 0
void TC3_Handler()
{
        TC_GetStatus(TC1, 0);
        digitalWrite(13, l = !l);
}

void startTimer(Tc *tc, uint32_t channel, IRQn_Type irq, uint32_t frequency) {
        pmc_set_writeprotect(false);
        pmc_enable_periph_clk((uint32_t)irq);
        TC_Configure(tc, channel, TC_CMR_WAVE | TC_CMR_WAVSEL_UP_RC | TC_CMR_TCCLKS_TIMER_CLOCK4);
        uint32_t rc = VARIANT_MCK/128/frequency; //128 because we selected TIMER_CLOCK4 above
        TC_SetRA(tc, channel, rc/2); //50% high, 50% low
        TC_SetRC(tc, channel, rc);
        TC_Start(tc, channel);
        tc->TC_CHANNEL[channel].TC_IER=TC_IER_CPCS;
        tc->TC_CHANNEL[channel].TC_IDR=~TC_IER_CPCS;
        NVIC_EnableIRQ(irq);
}

void setup(){
        pinMode(13,OUTPUT);
        startTimer(TC1, 0, TC3_IRQn, 4); //TC1 channel 0, the IRQ for that channel and the desired frequency
}

void loop(){
}
Here is the table of parameters:

ISR/IRQ TC Channel Due pins

TC0 TC0 0 2, 13

TC1 TC0 1 60, 61

TC2 TC0 2 58

TC3 TC1 0 none <- this line in the example above

TC4 TC1 1 none

TC5 TC1 2 none

TC6 TC2 0 4, 5

TC7 TC2 1 3, 10

TC8 TC2 2 11, 12

As you said:

TC6 TC2 0 4, 5

but when I change TC to TC2 and choose channel 0 and choose either 4 or 5 pin it does not blink!

Do I need to change the clock as well? Actually we do not have clock 6!!!

Can you please explain me how can I get frequency from the other channels and timers please?

Thanks!

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ISR/IRQ	TC	Channel	Due pins
TC0	TC0	0	2, 13
TC1	TC0	1	60, 61
TC2	TC0	2	58
TC3	TC1	0	none <- this line in the example above
TC4	TC1	1	none
TC5	TC1	2	none
TC6	TC2	0	4, 5
TC7	TC2	1	3, 10
TC8	TC2	2	11, 12

Timer Interrupts on Due

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