L-KAYA
commented
1 year ago If you're using simplex mode, the I2S gpio configuration will be overwritten by the latter port if you set the data line to a same GPIO, so you won't receive the loopback data in your console.
To check if the mic can work, you can just remove the initialization of the TX part and the writing task. Meanwhile, to monitor the data timely, you may want to reduce the polling time of the reading task. Here is the code for reference:
/*
* SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Unlicense OR CC0-1.0
*/
#include <stdint.h>
#include <stdlib.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/i2s_std.h"
#include "driver/gpio.h"
#include "esp_check.h"
#include "sdkconfig.h"
#define EXAMPLE_STD_BCLK_IO2 GPIO_NUM_22 // I2S bit clock io number
#define EXAMPLE_STD_WS_IO2 GPIO_NUM_23 // I2S word select io number
#define EXAMPLE_STD_DOUT_IO2 GPIO_NUM_25 // I2S data out io number
#define EXAMPLE_STD_DIN_IO2 GPIO_NUM_26 // I2S data in io number
#define EXAMPLE_BUFF_SIZE 2048
static i2s_chan_handle_t rx_chan; // I2S rx channel handler
static void i2s_example_read_task(void *args)
{
uint8_t *r_buf = (uint8_t *)calloc(1, EXAMPLE_BUFF_SIZE);
assert(r_buf); // Check if r_buf allocation success
size_t r_bytes = 0;
/* Enable the RX channel */
ESP_ERROR_CHECK(i2s_channel_enable(rx_chan));
while (1) {
/* Read i2s data */
if (i2s_channel_read(rx_chan, r_buf, EXAMPLE_BUFF_SIZE, &r_bytes, 1000) == ESP_OK) {
printf("Read Task: i2s read %d bytes\n-----------------------------------\n", r_bytes);
printf("[0] %x [1] %x [2] %x [3] %x\n[4] %x [5] %x [6] %x [7] %x\n\n",
r_buf[0], r_buf[1], r_buf[2], r_buf[3], r_buf[4], r_buf[5], r_buf[6], r_buf[7]);
} else {
printf("Read Task: i2s read failed\n");
}
vTaskDelay(pdMS_TO_TICKS(10));
}
free(r_buf);
vTaskDelete(NULL);
}
static void i2s_example_init_std_simplex(void)
{
i2s_chan_config_t rx_chan_cfg = I2S_CHANNEL_DEFAULT_CONFIG(I2S_NUM_AUTO, I2S_ROLE_MASTER);
ESP_ERROR_CHECK(i2s_new_channel(&rx_chan_cfg, NULL, &rx_chan));
i2s_std_config_t rx_std_cfg = {
.clk_cfg = I2S_STD_CLK_DEFAULT_CONFIG(16000),
.slot_cfg = I2S_STD_PHILIPS_SLOT_DEFAULT_CONFIG(I2S_DATA_BIT_WIDTH_32BIT, I2S_SLOT_MODE_MONO),
.gpio_cfg = {
.mclk = I2S_GPIO_UNUSED, // some codecs may require mclk signal, this example doesn't need it
.bclk = EXAMPLE_STD_BCLK_IO2,
.ws = EXAMPLE_STD_WS_IO2,
.dout = EXAMPLE_STD_DOUT_IO2,
.din = EXAMPLE_STD_DIN_IO2,
.invert_flags = {
.mclk_inv = false,
.bclk_inv = false,
.ws_inv = false,
},
},
};
ESP_ERROR_CHECK(i2s_channel_init_std_mode(rx_chan, &rx_std_cfg));
}
void app_main(void)
{
i2s_example_init_std_simplex();
xTaskCreate(i2s_example_read_task, "i2s_example_read_task", 4096, NULL, 5, NULL);
}
misterb0407
Answers checklist.
General issue report
I have ESP-EYE board which is ESP32 type. It has a built in microphone, connected to ESP32 via I2S peripheral.
I tried sample in examples/peripherals/i2s/i2s_basic in simplex mode, and I update the GPIO number accordingly in
i2s_example_init_std_simplex(), it build and run on the board and printing something likeWrite Task: i2s write 2048 bytesRead Task: i2s read 2048 bytes-----------------------------------[0] 0 [1] 0 [2] 0 [3] 0[4] 0 [5] 0 [6] 0 [7] 0I tried to speak over the microphone and the console still show i2s read buffer value of 0s like above.
So how can I know if my I2S init works as expected?