Thanks for posting the timer code. We need a 10Khz signal but using 10,000 as the value in the last parameter (as suggested by cmaglie) seems to - in our case at least - deliver half the required frequency (i.e. 5Khz) - according to our scope at least. However, when we use the value of 20,000 - and look at the value on the scope - we get a 100us square wave.
Are we misinterpreting something? This is the code we use to get our 10Khz signal - could someone please verify our findings for us?
Also, we need to synchronise the start of these pulses with some other Due's so that they all output synchronised pulses. Can anyone help us with that? Do we simply re-start the timer and, if so, how?
Thanks all,
Dev team
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, 20000); //TC1 channel 0, the IRQ for that channel and the desired frequency
// 20,000 seems to give 100uS/div signal, which is equivalent to 10,000Hz or 10Khz
}void loop(){
}