hi, I am using nrf52832 development board for PWM and I want to play an audio (.wav) file using PWM, I am unable to play the audio clip using the PWM, and same audio file I am able to play in Arduino UNO board. Can you please tell me the procedure to play the audio clip in the nrf52832 board using PWM. I am using The SDK version 15.3.0, I have taken reference of pwm driver example to develop. nRF5_SDK_15.3.0/examples/peripheral/pwm_driver.
please find below the attachments of code and audio file .
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/** @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 <stdio.h>
#include <string.h>
#include "nrf_drv_pwm.h"
#include "app_util_platform.h"
#include "app_error.h"
#include "boards.h"
#include "bsp.h"
#include "app_timer.h"
#include "nrf_drv_clock.h"
#include "nrf_delay.h"
#include "tone.h"
#include "airtel.h"
#include "nrf_gpio.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
#define AUDIO 2
static nrf_drv_pwm_t m_pwm0 = NRF_DRV_PWM_INSTANCE(0);
static void pwm_stop(void)
{
nrf_drv_pwm_uninit(&m_pwm0);
nrf_gpio_pin_clear(AUDIO);
}
nrf_pwm_values_individual_t seq_values;
nrf_pwm_sequence_t const seq =
{
.values.p_individual = &seq_values,
.length = NRF_PWM_VALUES_LENGTH(seq_values),
.repeats = 0,
.end_delay = 0
};
void play_audio(void)
{
uint16_t len = sizeof(airtel)/sizeof(airtel[1]);
for(uint16_t i = 0;i<len;i++)
{
seq_values.channel_0 = airtel[i];
nrf_delay_ms(1);
(void)nrf_drv_pwm_simple_playback(&m_pwm0, &seq, 1, NRF_DRV_PWM_FLAG_STOP);
}
}
static void vib_pwm_init(void)
{
nrf_drv_pwm_config_t const config0 =
{
.output_pins =
{
AUDIO , // channel 0
NRF_DRV_PWM_PIN_NOT_USED, // channel 1
NRF_DRV_PWM_PIN_NOT_USED, // channel 2
NRF_DRV_PWM_PIN_NOT_USED, // channel 3
},
.irq_priority = APP_IRQ_PRIORITY_LOWEST,
.base_clock = NRF_PWM_CLK_125kHz,
.count_mode = NRF_PWM_MODE_UP,
.top_value = 255,
.load_mode = NRF_PWM_LOAD_COMMON,
.step_mode = NRF_PWM_STEP_AUTO
};
APP_ERROR_CHECK(nrf_drv_pwm_init(&m_pwm0, &config0, NULL));
}
/*
* Applicatin entry
*/
int main(void)
{
nrf_gpio_pin_dir_set(AUDIO,NRF_GPIO_PIN_DIR_OUTPUT);
nrf_gpio_pin_clear(AUDIO);
for (;;)
{
vib_pwm_init();
play_audio();
pwm_stop();
nrf_delay_ms(2000);
printf("audio\r\n");
}
}
