I2S - can wroom be slave and receive pcm data?
Posted: Thu Jun 20, 2024 12:20 pm
I'm new to I2S and there is not much information about how to set it as slave and receive pcm data. What i've tried is two esp32 S3-wroom as i2s master and slave based on the official I2S example > FullDuplex, if i change the communication_format to I2S_COMM_FORMAT_I2S, the slave's serial will print a serials of "0", its not what i sent but it's another problem. But if i change both master and slave to I2S_COMM_FORMAT_STAND_PCM_SHORT, the slave will not print at all. Is there other thing i need to do to receive PCM data? I only wired bck, ws, and data in or out three lines, the mclk is floating. The slave code is like:
- #include "driver/i2s.h"
- i2s_config_t i2s_config = {
- .mode = (i2s_mode_t)(I2S_MODE_SLAVE | I2S_MODE_TX | I2S_MODE_RX),
- .sample_rate = 8000,
- .bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
- .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
- .communication_format = I2S_COMM_FORMAT_STAND_PCM_SHORT,
- .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
- .dma_buf_count = 8,
- .dma_buf_len = 256,
- .use_apll = true,
- };
- i2s_pin_config_t pin_config = {
- .bck_io_num = 4,
- .ws_io_num = 5,
- .data_out_num = 7,
- .data_in_num = 6
- };
- uint16_t rxbuf[256];
- size_t readsize = 0;
- void setup(){
- i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);
- i2s_set_pin(I2S_NUM_0, &pin_config);
- Serial.begin(115200);
- }
- void loop(){
- readsize=0;
- i2s_read(I2S_NUM_0, &rxbuf[0], 3, &readsize, 100);
- if(readsize > 0){
- for(int i = 0; i < readsize; i++){
- Serial.print(rxbuf[i]);
- Serial.print(" ");
- }
- Serial.println();
- }
- }