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esp-idf/examples/peripherals/i2s/i2s_adc_dac/main/app_main.c

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/*
* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Unlicense OR CC0-1.0
*/
/* ADC/DAC are not supported in the new I2S driver, but still available in the legacy I2S driver for backward compatibility
* Please turn to the dedicated ADC/DAC driver instead */
#pragma message("ADC/DAC on ESP32 will no longer supported via I2S driver")
#include <stdio.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "spi_flash_mmap.h"
#include "esp_err.h"
#include "esp_log.h"
#include "esp_partition.h"
#include "driver/i2s.h"
#include "audio_example_file.h"
#include "esp_rom_sys.h"
#include "driver/adc.h"
#include "esp_adc_cal.h"
#if CONFIG_IDF_TARGET_ESP32
static const char* TAG = "ad/da";
#define V_REF 1100
#define ADC1_TEST_CHANNEL (ADC1_CHANNEL_7)
#define PARTITION_NAME "storage"
/*---------------------------------------------------------------
EXAMPLE 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))
//I2S built-in ADC unit
#define I2S_ADC_UNIT ADC_UNIT_1
//I2S built-in ADC channel
#define I2S_ADC_CHANNEL ADC1_CHANNEL_0
//flash record size, for recording 5 seconds' data
#define FLASH_RECORD_SIZE (EXAMPLE_I2S_CHANNEL_NUM * EXAMPLE_I2S_SAMPLE_RATE * EXAMPLE_I2S_SAMPLE_BITS / 8 * 5)
#define FLASH_ERASE_SIZE (FLASH_RECORD_SIZE % FLASH_SECTOR_SIZE == 0) ? FLASH_RECORD_SIZE : FLASH_RECORD_SIZE + (FLASH_SECTOR_SIZE - FLASH_RECORD_SIZE % FLASH_SECTOR_SIZE)
//sector size of flash
#define FLASH_SECTOR_SIZE (0x1000)
//flash read / write address
#define FLASH_ADDR (0x200000)
/**
* @brief I2S ADC/DAC mode init.
*/
void example_i2s_init(void)
{
int i2s_num = EXAMPLE_I2S_NUM;
i2s_config_t i2s_config = {
.mode = I2S_MODE_MASTER | I2S_MODE_RX | I2S_MODE_TX | I2S_MODE_DAC_BUILT_IN | I2S_MODE_ADC_BUILT_IN,
.sample_rate = EXAMPLE_I2S_SAMPLE_RATE,
.bits_per_sample = EXAMPLE_I2S_SAMPLE_BITS,
.communication_format = I2S_COMM_FORMAT_STAND_MSB,
.channel_format = EXAMPLE_I2S_FORMAT,
.intr_alloc_flags = 0,
.dma_desc_num = 6,
.dma_frame_num = 256,
.use_apll = 1,
};
//install and start i2s driver
i2s_driver_install(i2s_num, &i2s_config, 0, NULL);
//init DAC pad
i2s_set_dac_mode(I2S_DAC_CHANNEL_BOTH_EN);
//init ADC pad
i2s_set_adc_mode(I2S_ADC_UNIT, I2S_ADC_CHANNEL);
}
/*
* @brief erase flash for recording
*/
void example_erase_flash(void)
{
#if RECORD_IN_FLASH_EN
printf("Erasing flash \n");
const esp_partition_t *data_partition = NULL;
data_partition = esp_partition_find_first(ESP_PARTITION_TYPE_DATA,
ESP_PARTITION_SUBTYPE_DATA_FAT, PARTITION_NAME);
if (data_partition != NULL) {
printf("partiton addr: 0x%08"PRIx32"; size: %"PRIu32"; label: %s\n", data_partition->address, data_partition->size, data_partition->label);
}
printf("Erase size: %d Bytes\n", FLASH_ERASE_SIZE);
ESP_ERROR_CHECK(esp_partition_erase_range(data_partition, 0, FLASH_ERASE_SIZE));
#else
printf("Skip flash erasing...\n");
#endif
}
/**
* @brief debug buffer data
*/
void example_disp_buf(uint8_t* buf, int length)
{
#if EXAMPLE_I2S_BUF_DEBUG
printf("======\n");
for (int i = 0; i < length; i++) {
printf("%02x ", buf[i]);
if ((i + 1) % 8 == 0) {
printf("\n");
}
}
printf("======\n");
#endif
}
/**
* @brief Reset i2s clock and mode
*/
void example_reset_play_mode(void)
{
i2s_set_clk(EXAMPLE_I2S_NUM, EXAMPLE_I2S_SAMPLE_RATE, EXAMPLE_I2S_SAMPLE_BITS, EXAMPLE_I2S_CHANNEL_NUM);
}
/**
* @brief Set i2s clock for example audio file
*/
void example_set_file_play_mode(void)
{
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.
*/
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 Scale data to 8bit for data from ADC.
* Data from ADC are 12bit width by default.
* DAC can only output 8 bit data.
* Scale each 12bit ADC data to 8bit DAC data.
*/
void example_i2s_adc_data_scale(uint8_t * d_buff, uint8_t* s_buff, uint32_t len)
{
uint32_t j = 0;
uint32_t dac_value = 0;
#if (EXAMPLE_I2S_SAMPLE_BITS == 16)
for (int i = 0; i < len; i += 2) {
dac_value = ((((uint16_t) (s_buff[i + 1] & 0xf) << 8) | ((s_buff[i + 0]))));
d_buff[j++] = 0;
d_buff[j++] = dac_value * 256 / 4096;
}
#else
for (int i = 0; i < len; i += 4) {
dac_value = ((((uint16_t)(s_buff[i + 3] & 0xf) << 8) | ((s_buff[i + 2]))));
d_buff[j++] = 0;
d_buff[j++] = 0;
d_buff[j++] = 0;
d_buff[j++] = dac_value * 256 / 4096;
}
#endif
}
/**
* @brief I2S ADC/DAC example
* 1. Erase flash
* 2. Record audio from ADC and save in flash
* 3. Read flash and replay the sound via DAC
* 4. Play an example audio file(file format: 8bit/8khz/single channel)
* 5. Loop back to step 3
*/
void example_i2s_adc_dac(void*arg)
{
const esp_partition_t *data_partition = NULL;
data_partition = esp_partition_find_first(ESP_PARTITION_TYPE_DATA,
ESP_PARTITION_SUBTYPE_DATA_FAT, PARTITION_NAME);
if (data_partition != NULL) {
printf("partiton addr: 0x%08"PRIx32"; size: %"PRIu32"; label: %s\n", data_partition->address, data_partition->size, data_partition->label);
} else {
ESP_LOGE(TAG, "Partition error: can't find partition name: %s\n", PARTITION_NAME);
vTaskDelete(NULL);
}
//1. Erase flash
example_erase_flash();
int i2s_read_len = EXAMPLE_I2S_READ_LEN;
int flash_wr_size = 0;
size_t bytes_read, bytes_written;
//2. Record audio from ADC and save in flash
#if RECORD_IN_FLASH_EN
char* i2s_read_buff = (char*) calloc(i2s_read_len, sizeof(char));
uint8_t* flash_write_buff = (uint8_t*) calloc(i2s_read_len, sizeof(char));
i2s_adc_enable(EXAMPLE_I2S_NUM);
while (flash_wr_size < FLASH_RECORD_SIZE) {
//read data from I2S bus, in this case, from ADC.
i2s_read(EXAMPLE_I2S_NUM, (void*) i2s_read_buff, i2s_read_len, &bytes_read, portMAX_DELAY);
example_disp_buf((uint8_t*) i2s_read_buff, 64);
//save original data from I2S(ADC) into flash.
esp_partition_write(data_partition, flash_wr_size, i2s_read_buff, i2s_read_len);
flash_wr_size += i2s_read_len;
esp_rom_printf("Sound recording %u%%\n", flash_wr_size * 100 / FLASH_RECORD_SIZE);
}
i2s_adc_disable(EXAMPLE_I2S_NUM);
free(i2s_read_buff);
i2s_read_buff = NULL;
free(flash_write_buff);
flash_write_buff = NULL;
#endif
uint8_t* flash_read_buff = (uint8_t*) calloc(i2s_read_len, sizeof(char));
uint8_t* i2s_write_buff = (uint8_t*) calloc(i2s_read_len, sizeof(char));
while (1) {
//3. Read flash and replay the sound via DAC
#if REPLAY_FROM_FLASH_EN
for (int rd_offset = 0; rd_offset < flash_wr_size; rd_offset += FLASH_SECTOR_SIZE) {
//read I2S(ADC) original data from flash
esp_partition_read(data_partition, rd_offset, flash_read_buff, FLASH_SECTOR_SIZE);
//process data and scale to 8bit for I2S DAC.
example_i2s_adc_data_scale(i2s_write_buff, flash_read_buff, FLASH_SECTOR_SIZE);
//send data
i2s_write(EXAMPLE_I2S_NUM, i2s_write_buff, FLASH_SECTOR_SIZE, &bytes_written, portMAX_DELAY);
printf("playing: %d %%\n", rd_offset * 100 / flash_wr_size);
}
#endif
//4. Play an example audio file(file format: 8bit/16khz/single channel)
printf("Playing file example: \n");
int offset = 0;
int tot_size = sizeof(audio_table);
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);
}
vTaskDelay(100 / portTICK_PERIOD_MS);
example_reset_play_mode();
}
free(flash_read_buff);
free(i2s_write_buff);
vTaskDelete(NULL);
}
void adc_read_task(void* arg)
{
adc1_config_width(ADC_WIDTH_BIT_12);
adc1_config_channel_atten(ADC1_TEST_CHANNEL, ADC_ATTEN_DB_11);
esp_adc_cal_characteristics_t characteristics;
esp_adc_cal_characterize(ADC_UNIT_1, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_12, V_REF, &characteristics);
while(1) {
uint32_t voltage;
vTaskDelay(200 / portTICK_PERIOD_MS);
esp_adc_cal_get_voltage(ADC1_TEST_CHANNEL, &characteristics, &voltage);
ESP_LOGI(TAG, "%"PRIu32" mV", voltage);
}
}
esp_err_t app_main(void)
{
example_i2s_init();
esp_log_level_set("I2S", ESP_LOG_INFO);
xTaskCreate(example_i2s_adc_dac, "example_i2s_adc_dac", 1024 * 2, NULL, 5, NULL);
xTaskCreate(adc_read_task, "ADC read task", 2048, NULL, 5, NULL);
return ESP_OK;
}
#endif
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