misterb0407
commented
1 year ago I wonder if in the first place we can use PDM mode for ESP-EYE board? How do we decide which mode is used given development board?
Open misterb0407 opened 1 year ago
misterb0407
commented
1 year ago I wonder if in the first place we can use PDM mode for ESP-EYE board? How do we decide which mode is used given development board?
L-KAYA
commented
1 year ago @misterb0407 As the datasheet in #11678 , this MIC only can recognize I2S format. I'm not sure PDM will work to it. PDM only has one clock signal, but I2S have BCLK and WS two, so, depends on MIC though.
I'll try to write a set of configuration.
L-KAYA
commented
1 year ago #include <stdint.h>
#include <stdlib.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/i2s_pdm.h"
#include "driver/gpio.h"
#include "esp_err.h"
#include "sdkconfig.h"
#define EXAMPLE_PDM_RX_CLK_IO GPIO_NUM_26 // I2S PDM RX clock io number
#define EXAMPLE_PDM_RX_DIN_IO GPIO_NUM_33 // I2S PDM RX data in io number
#define EXAMPLE_PDM_RX_FREQ_HZ 16000 // I2S PDM RX frequency
static i2s_chan_handle_t i2s_example_init_pdm_rx(void)
{
i2s_chan_handle_t rx_chan; // I2S rx channel handler
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_pdm_rx_config_t pdm_rx_cfg = {
.clk_cfg = I2S_PDM_RX_CLK_DEFAULT_CONFIG(EXAMPLE_PDM_RX_FREQ_HZ),
/* The data bit-width of PDM mode is fixed to 16 */
.slot_cfg = I2S_PDM_RX_SLOT_DEFAULT_CONFIG(I2S_DATA_BIT_WIDTH_16BIT, I2S_SLOT_MODE_STEREO),
.gpio_cfg = {
.clk = EXAMPLE_PDM_RX_CLK_IO,
.din = EXAMPLE_PDM_RX_DIN_IO,
.invert_flags = {
.clk_inv = false,
},
},
};
ESP_ERROR_CHECK(i2s_channel_init_pdm_rx_mode(rx_chan, &pdm_rx_cfg));
ESP_ERROR_CHECK(i2s_channel_enable(rx_chan));
return rx_chan;
}
void app_main(void)
{
int16_t *r_buf = (int16_t *)calloc(1, EXAMPLE_BUFF_SIZE);
assert(r_buf);
i2s_chan_handle_t rx_chan = i2s_example_init_pdm_rx();
size_t r_bytes = 0;
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] %d [1] %d [2] %d [3] %d\n[4] %d [5] %d [6] %d [7] %d\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));
}
}
chucrut
commented
1 year ago I have the same problem. The buffer is filled with exactly the same "random" numbers each time. Is not reading data from the PDM mic
Answers checklist.
IDF version.
v5.1
Operating System used.
Linux
How did you build your project?
Command line with idf.py
If you are using Windows, please specify command line type.
None
Development Kit.
ESP-EYE
Power Supply used.
USB
What is the expected behavior?
I expect for the I2S read buffer to display some random number when we speak to the microphone of the ESP-EYE board.
What is the actual behavior?
The I2S read buffer keep showing dummy value of -30935 like following regardless we speak or not to the microphone.
Steps to reproduce.
PDM RXmode$ idf.py menuconfig-> I2S PDM Example Configuration -> I2S PDM direction -> PDM RXDebug Logs.
More Information.
I have modified the sample code to set the GPIO number associated with the ESP-EYE like following in function
i2s_example_init_pdm_rx()i2s_pdm_rx_config_t pdm_rx_cfg = { .clk_cfg = I2S_PDM_RX_CLK_DEFAULT_CONFIG(EXAMPLE_PDM_RX_FREQ_HZ), /* The data bit-width of PDM mode is fixed to 16 */ .slot_cfg = I2S_PDM_RX_SLOT_DEFAULT_CONFIG(I2S_DATA_BIT_WIDTH_16BIT, I2S_SLOT_MODE_MONO), .gpio_cfg = { .clk = 26, //EXAMPLE_PDM_RX_CLK_IO, .din = 33, //EXAMPLE_PDM_RX_DIN_IO, .invert_flags = { .clk_inv = false, }, }, };