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Forum: ARM programming with GCC/GNU tools PWM on SAMD21


Author: Víctor (Guest)
Posted on:

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So I was trying this code I got right off a book but changing the pin 
where I should have the PWM signal output... but it is not working... 
any guesses why?... PD: I can't do debugging because I have a strange 
error on executing the ELF file.

Wrote this code on and did the programming on atmel studio 7 with the 
atmel - ice.
#include "sam.h"

unsigned char* ARRAY_PORT_PINCFG0 = (unsigned char*)&REG_PORT_PINCFG0;
unsigned char* ARRAY_PORT_PMUX0 = (unsigned char*)&REG_PORT_PMUX0;

int main(void)
{
  
  REG_GCLK_CLKCTRL = 0x401A; //TCC0 para PWM en GCLK0
    REG_PM_APBCMASK |= 0x00000100; //Enable TCC0, es la funcion F para el pin PA17
  REG_TCC0_CTRLA = 1; //Reset al registro

  while(REG_TCC0_CTRLA & 1){} //Esperar hasta sincronizar
  
  REG_TCC0_WAVE = 2; // Modo PWM normal
  REG_TCC0_PER = 16666-1;
  REG_TCC0_CC0 = 5555-1;
  REG_TCC0_CTRLA |= 2;
  
  ARRAY_PORT_PINCFG0[17] |= 1; //Activa el multiplexor a perifericos
  ARRAY_PORT_PMUX0[8] = (0x5<<4);
  
  while (1) 
    {
  }
}

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