Nordic SDK: PWM duty cycle of 0 on LED

[tyler]

I am using PWM on a BLE Nano using Nordic SDK. I was having problems with the PWM and decided I would set the duty cycle to 0 to see if the program was working right:

#include <stdbool.h>  
#include <stdint.h>
#include "nrf.h"
#include "app_error.h"
#include "bsp.h"
#include "nrf_delay.h"
#include "app_pwm.h"

#define TIMER1_INSTANCE_INDEX      (TIMER0_ENABLED)


APP_PWM_INSTANCE(PWM1,1);                   // Create the instance "PWM1" using TIMER1.

static volatile bool ready_flag;            // A flag indicating PWM status.

void pwm_ready_callback(uint32_t pwm_id)    // PWM callback function
 {
ready_flag = true;
}

int main(void)
{
ret_code_t err_code;

app_pwm_config_t pwm1_cfg = APP_PWM_DEFAULT_CONFIG_1CH(5000L, BSP_LED_0);
int dutyCycle = 0;
app_pwm_channel_duty_set(&PWM1, 0, dutyCycle);

pwm1_cfg.pin_polarity[1] = APP_PWM_POLARITY_ACTIVE_HIGH;

/* Initialize and enable PWM. */
err_code = app_pwm_init(&PWM1,&pwm1_cfg,pwm_ready_callback);
APP_ERROR_CHECK(err_code);
app_pwm_enable(&PWM1);

}```   

After doing this I hooked an LED up to BSP_LED_0 and was surprised to find that it lit up. What could cause an LED to light up when the duty cycle is 0? Am I doing something wrong?

[Sigurd]

I tested the PWM code here and it worked fine here using S130 SoftDevice on a nRF51-DK. Note that you will never get the "PWM complete" printf since you wont be exiting the while loop. Also note that the projects in the SDK is setup to use the nRF51-DK, and I believe you have to change the board file to support the BLE Nano board. I don't know what project you are developing, but have you considered buying a nRF52-DK instead of using the BLE Nano board?