A timing app designed to run on my Odroid-GO
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#include "audio.h"
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>
#include <driver/i2s.h>
static const gpio_num_t AUDIO_AMP_SD_PIN = GPIO_NUM_25;
static QueueHandle_t gQueue;
typedef struct
{
uint16_t* buffer;
int length;
} QueueData;
static void PlayTask(void *arg)
{
for(;;)
{
QueueData data;
if (xQueueReceive(gQueue, &data, 10))
{
size_t bytesWritten;
i2s_write(I2S_NUM_0, data.buffer, data.length, &bytesWritten, portMAX_DELAY);
i2s_zero_dma_buffer(I2S_NUM_0);
}
vTaskDelay(1 / portTICK_PERIOD_MS);
}
}
void Odroid_InitializeAudio(void)
{
// Configure the amplifier shutdown signal
{
gpio_config_t gpioConfig = {};
gpioConfig.mode = GPIO_MODE_OUTPUT;
gpioConfig.pin_bit_mask = 1ULL << AUDIO_AMP_SD_PIN;
ESP_ERROR_CHECK(gpio_config(&gpioConfig));
gpio_set_level(AUDIO_AMP_SD_PIN, 1);
}
// Configure the I2S driver
{
i2s_config_t i2sConfig= {};
i2sConfig.mode = I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_DAC_BUILT_IN;
i2sConfig.sample_rate = 5512;
i2sConfig.bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT;
i2sConfig.communication_format = I2S_COMM_FORMAT_I2S_MSB;
i2sConfig.channel_format = I2S_CHANNEL_FMT_ONLY_LEFT;
i2sConfig.dma_buf_count = 8;
i2sConfig.dma_buf_len = 64;
ESP_ERROR_CHECK(i2s_driver_install(I2S_NUM_0, &i2sConfig, 0, NULL));
ESP_ERROR_CHECK(i2s_set_dac_mode(I2S_DAC_CHANNEL_LEFT_EN));
}
// Create task for playing sounds so that our main task isn't blocked
{
gQueue = xQueueCreate(1, sizeof(QueueData));
assert(gQueue);
BaseType_t result = xTaskCreatePinnedToCore(&PlayTask, "I2S Task", 1024, NULL, 5, NULL, 1);
assert(result == pdPASS);
}
}
void Odroid_PlayAudio(uint16_t* buffer, int length)
{
QueueData data = {};
data.buffer = buffer;
data.length = length;
xQueueSendToBack(gQueue, &data, portMAX_DELAY);
}