Hi all! I used PWM module of nRF52832 to create the PWM but i don't know how to update new value to duty_cycle. This is my code. I used Button (Pin 13) to set a new DUTY_CYCLE. Help me, pls.
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include "nrf.h"
#define NRF_LOG_MODULE_NAME "APP"
#include "SEGGER_RTT.h"
uint16_t DUTY_CYCLE = 15000;
static void PWM_config(void)
{
uint16_t pwm_seq[4] = {DUTY_CYCLE};
NRF_PWM0->PSEL.OUT[0] = (20 << 0) | (0 << 31);
NRF_PWM0->ENABLE = (1 << 0);
NRF_PWM0->MODE = (2 << 0);
NRF_PWM0->PRESCALER = (7 << 0);
NRF_PWM0->COUNTERTOP = (30000 << 0);
NRF_PWM0->LOOP = (0 << 0);
NRF_PWM0->DECODER = (2 << 0) | (0 << 8);
NRF_PWM0->SEQ[0].PTR = (uint32_t)(pwm_seq);
NRF_PWM0->SEQ[0].CNT =((sizeof(pwm_seq) / sizeof(uint16_t)) << 0);
NRF_PWM0->SEQ[0].REFRESH = 0;
NRF_PWM0->SEQ[0].ENDDELAY = 0;
NRF_PWM0->TASKS_SEQSTART[0] = 1;
}
int main(void)
{
NRF_GPIO -> PIN_CNF[13] = ((0<<0)|(0<<1)|(3<<2)|(2<<8)|(3<<16));
NRF_GPIO -> PIN_CNF[17] = ((1<<0)|(1<<1)|(0<<2)|(2<<8)|(0<<16));
SEGGER_RTT_WriteString(0, "Hello World!\n");
PWM_config();
while (1)
{
if (((NRF_GPIO -> IN >> 13) & 1) == 0)
{
DUTY_CYCLE = 30000;
NRF_GPIO -> OUT = 0<<17;
//NRF_PWM0-> TASKS_STOP = 1;
//while (((NRF_GPIO -> IN >> 13) & 1) == 0);
//NRF_PWM0->COUNTERTOP = (15000 << 0);
}
else
{
//DUTY_CYCLE = 30000;
//NRF_PWM0->TASKS_SEQSTART[0] = 1;
NRF_GPIO -> OUT = 1<<17;
}
}
}
