I'm using an nrf52832 development board and am trying to implement a simple toggling of an output pin using a timer and PPI.
Below is the code I’m using; however, the pin doesn’t toggle but stays high. Any help appreciated.
#define PIN 30
NRF_TIMER1->MODE = 0; //timer mode
NRF_TIMER1->BITMODE = 0; //16 bit timer width
NRF_TIMER1->PRESCALER = 4; //16MHz / 2^4 = 1MHz
NRF_TIMER1->SHORTS = 1; //timer cleared at CC[0]
NRF_TIMER1->CC[0] = 1000; //.001 secs
NRF_GPIOTE->CONFIG[0] = (3 | PIN << 8 | 3 << 16 | 1 << 20); //task mode, PIN selected, toggle, PIN high initially
//Configure PPI channel 0 to toggle PIN on every Timer 1 COMPARE[0] match
NRF_PPI->CH[0].EEP = (uint32_t)&NRF_TIMER1->EVENTS_COMPARE[0];
NRF_PPI->CH[0].TEP = (uint32_t)&NRF_GPIOTE->TASKS_OUT[0];
NRF_PPI->CHENSET = 1; //enable PPI channel 0
NRF_TIMER1->TASKS_START = 1;
