esp-idf/components/driver/test/dac_dma_test/test_esp32.c

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// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/*
Tests for the dac device driver on ESP32 only
Hardware connection:
- ESP32: GPIO25 <---> GPIO26
*/
#include "sdkconfig.h"
#if CONFIG_IDF_TARGET_ESP32
#include "esp_system.h"
#include "driver/adc.h"
#include "unity.h"
#include "esp_system.h"
#include "esp_event.h"
#include "esp_wifi.h"
#include "esp_log.h"
#include "nvs_flash.h"
#include "test_utils.h"
#include "test_dac_audio_file.h"
#include "driver/i2s.h"
#include "driver/dac.h"
/*
* DAC DMA config.
*/
//enable record sound and save in flash
#define RECORD_IN_FLASH_EN (1)
//enable replay recorded sound in flash
#define REPLAY_FROM_FLASH_EN (1)
//i2s number
#define EXAMPLE_I2S_NUM (0)
//i2s sample rate
#define EXAMPLE_I2S_SAMPLE_RATE (16000)
//i2s data bits
#define EXAMPLE_I2S_SAMPLE_BITS (16)
//enable display buffer for debug
#define EXAMPLE_I2S_BUF_DEBUG (0)
//I2S read buffer length
#define EXAMPLE_I2S_READ_LEN (16 * 1024)
//I2S data format
#define EXAMPLE_I2S_FORMAT (I2S_CHANNEL_FMT_RIGHT_LEFT)
//I2S channel number
#define EXAMPLE_I2S_CHANNEL_NUM ((EXAMPLE_I2S_FORMAT < I2S_CHANNEL_FMT_ONLY_RIGHT) ? (2) : (1))
/**
* @brief I2S ADC/DAC mode init.
*/
static void example_i2s_init(void)
{
int i2s_num = EXAMPLE_I2S_NUM;
i2s_config_t i2s_config = {
.mode = I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_DAC_BUILT_IN,
.sample_rate = EXAMPLE_I2S_SAMPLE_RATE,
.bits_per_sample = EXAMPLE_I2S_SAMPLE_BITS,
.channel_format = EXAMPLE_I2S_FORMAT,
.intr_alloc_flags = 0,
.dma_buf_count = 2,
.dma_buf_len = 1024,
.use_apll = 0,
};
//install and start i2s driver
TEST_ESP_OK( i2s_driver_install(i2s_num, &i2s_config, 0, NULL) );
//init DAC pad
TEST_ESP_OK( i2s_set_dac_mode(I2S_DAC_CHANNEL_BOTH_EN) );
}
static void example_i2s_deinit(void)
{
TEST_ESP_OK( i2s_set_dac_mode(I2S_DAC_CHANNEL_DISABLE) );
TEST_ESP_OK( i2s_driver_uninstall(EXAMPLE_I2S_NUM) );
}
/**
* @brief Set i2s clock for example audio file
*/
static void example_set_file_play_mode(void)
{
TEST_ESP_OK( i2s_set_clk(EXAMPLE_I2S_NUM, 16000, EXAMPLE_I2S_SAMPLE_BITS, 1) );
}
/**
* @brief Scale data to 16bit/32bit for I2S DMA output.
* DAC can only output 8bit data value.
* I2S DMA will still send 16 bit or 32bit data, the highest 8bit contains DAC data.
*/
static int example_i2s_dac_data_scale(uint8_t *d_buff, uint8_t *s_buff, uint32_t len)
{
uint32_t j = 0;
#if (EXAMPLE_I2S_SAMPLE_BITS == 16)
for (int i = 0; i < len; i++) {
d_buff[j++] = 0;
d_buff[j++] = s_buff[i];
}
return (len * 2);
#else
for (int i = 0; i < len; i++) {
d_buff[j++] = 0;
d_buff[j++] = 0;
d_buff[j++] = 0;
d_buff[j++] = s_buff[i];
}
return (len * 4);
#endif
}
/**
* @brief debug buffer data
*/
static void example_disp_buf(uint8_t *buf, int length)
{
printf("======\n");
for (int i = 0; i < length; i++) {
printf("%02x ", buf[i]);
if ((i + 1) % 8 == 0) {
printf("\n");
}
}
printf("======\n");
}
/**
* @brief Reset i2s clock and mode
*/
static void example_reset_play_mode(void)
{
TEST_ESP_OK( i2s_set_clk(EXAMPLE_I2S_NUM, EXAMPLE_I2S_SAMPLE_RATE, EXAMPLE_I2S_SAMPLE_BITS, EXAMPLE_I2S_CHANNEL_NUM) );
}
TEST_CASE("DAC DMA output", "[dac]")
{
size_t bytes_written;
int i2s_read_len = EXAMPLE_I2S_READ_LEN;
uint8_t *i2s_write_buff = (uint8_t *) calloc(i2s_read_len, sizeof(char));
int offset = 0;
int tot_size = sizeof(audio_table);
printf("Playing file example: \n");
example_i2s_init();
example_set_file_play_mode();
while (offset < tot_size) {
int play_len = ((tot_size - offset) > (4 * 1024)) ? (4 * 1024) : (tot_size - offset);
int i2s_wr_len = example_i2s_dac_data_scale(i2s_write_buff, (uint8_t *)(audio_table + offset), play_len);
i2s_write(EXAMPLE_I2S_NUM, i2s_write_buff, i2s_wr_len, &bytes_written, portMAX_DELAY);
offset += play_len;
example_disp_buf((uint8_t *) i2s_write_buff, 32);
}
example_reset_play_mode();
free(i2s_write_buff);
example_i2s_deinit();
}
#endif // CONFIG_IDF_TARGET_ESP32