I have a BLE device that is using Nordic SDK 8.1 and uses PWM to control an LED. Now I want to turn the led off with PWM. To do this I set the duty cycle to 0 and printed to the led. Yet when I do this the led stays on. What could cause this? Here is my code (it is in main.c in the example/ble-central/app-hrs dir from the sdk): ` /* Copyright (c) 2015 Nordic Semiconductor. All Rights Reserved. * * The information contained herein is property of Nordic Semiconductor ASA. * Terms and conditions of usage are described in detail in NORDIC * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT. * * Licensees are granted free, non-transferable use of the information. NO * WARRANTY of ANY KIND is provided. This heading must NOT be removed from * the file. * */
/** @file
* @defgroup pwm_example_main main.c
* @{
* @ingroup pwm_example
*
* @brief PWM Example Application main file.
*
* This file contains the source code for a sample application using PWM.
*
*
*/
#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.
int main(void)
{
ret_code_t err_code;
app_pwm_config_t pwm1_cfg = APP_PWM_DEFAULT_CONFIG_1CH(2000L, 28);
pwm1_cfg.pin_polarity[0] = APP_PWM_POLARITY_ACTIVE_LOW;
/* Initialize and enable PWM. */
err_code = app_pwm_init(&PWM1,&pwm1_cfg,NULL);
APP_ERROR_CHECK(err_code);
app_pwm_enable(&PWM1);
while(true)
{
int dutyCycle = 0;
/* Set the duty cycle - keep trying until PWM is ready... */
while(app_pwm_channel_duty_set(&PWM1, 0, dutyCycle) == NRF_ERROR_BUSY);
// enter into sleep mode
__SEV();
__WFE();
__WFE();
}
}
/** @} */
`
