- for (int i = 0; i < buf_len ; i++)
- {
- [Codebox=text file=Untitled.txt]
BuddyCasino wrote: ↑Thu Jul 13, 2017 11:25 amYou might want to take a look at my megaphone example.
BuddyCasino wrote: ↑Thu Jul 13, 2017 11:25 amYou might want to take a look at my megaphone example.
Just for reference I've had no problems capturing at 16Khz. However, If you try to capture and send in the same thread I would expect to have performance issues.felipeduque wrote: ↑Fri Feb 01, 2019 2:27 pmNow, I've only managed to get perfect I2S sound for sampling rate 8 kHz. From my experience with other I2S drivers (for H3 boards), it's a matter of proper clock handling. Probably some I2S master clock is too slow - maybe it didn't expect any sampling faster than 8 kHz? Anyway, I did not delve into it.
Hi friends!BuddyCasino wrote: ↑Thu May 25, 2017 1:44 pmHere is a complete example, I verified it works:Code: Select all
/* * app_main.c * * Created on: 30.03.2017 * Author: michaelboeckling */ #include <stdlib.h> #include <stddef.h> #include <inttypes.h> #include <string.h> #include <stdio.h> #include <stdbool.h> #include <sys/time.h> #include "freertos/FreeRTOS.h" #include "freertos/task.h" #include "freertos/event_groups.h" #include "esp_system.h" #include "esp_log.h" #include "driver/i2s.h" #define TAG "main" static void init_i2s() { const int sample_rate = 44100; /* TX: I2S_NUM_0 */ i2s_config_t i2s_config_tx = { .mode = I2S_MODE_MASTER | I2S_MODE_TX, .sample_rate = sample_rate, .bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT, .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT, // 2-channels .communication_format = I2S_COMM_FORMAT_I2S_MSB, .dma_buf_count = 32, // number of buffers, 128 max. .dma_buf_len = 32 * 2, // size of each buffer .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1 // Interrupt level 1 }; i2s_pin_config_t pin_config_tx = { .bck_io_num = GPIO_NUM_26, .ws_io_num = GPIO_NUM_25, .data_out_num = GPIO_NUM_22, .data_in_num = GPIO_NUM_23 }; i2s_driver_install(I2S_NUM_0, &i2s_config_tx, 0, NULL); i2s_set_pin(I2S_NUM_0, &pin_config_tx); /* RX: I2S_NUM_1 */ i2s_config_t i2s_config_rx = { .mode = I2S_MODE_MASTER | I2S_MODE_RX, // Only TX .sample_rate = sample_rate, .bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT, // Only 8-bit DAC support .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT, // 2-channels .communication_format = I2S_COMM_FORMAT_I2S_MSB, .dma_buf_count = 32, // number of buffers, 128 max. .dma_buf_len = 32 * 2, // size of each buffer .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1 // Interrupt level 1 }; i2s_pin_config_t pin_config_rx = { .bck_io_num = GPIO_NUM_17, .ws_io_num = GPIO_NUM_18, .data_out_num = I2S_PIN_NO_CHANGE, .data_in_num = GPIO_NUM_5 }; i2s_driver_install(I2S_NUM_1, &i2s_config_rx, 0, NULL); i2s_set_pin(I2S_NUM_1, &pin_config_rx); } void task_megaphone(void *pvParams) { uint16_t buf_len = 1024; char *buf = calloc(buf_len, sizeof(char)); struct timeval tv = {0}; struct timezone *tz = {0}; gettimeofday(&tv, &tz); uint64_t micros = tv.tv_usec + tv.tv_sec * 1000000; uint64_t micros_prev = micros; uint64_t delta = 0; init_i2s(); int cnt = 0; int bytes_written = 0; while(1) { char *buf_ptr_read = buf; char *buf_ptr_write = buf; // read whole block of samples int bytes_read = 0; while(bytes_read == 0) { bytes_read = i2s_read_bytes(I2S_NUM_1, buf, buf_len, 0); } uint32_t samples_read = bytes_read / 2 / (I2S_BITS_PER_SAMPLE_32BIT / 8); // convert 2x 32 bit stereo -> 1 x 16 bit mono for(int i = 0; i < samples_read; i++) { // const char samp32[4] = {ptr_l[0], ptr_l[1], ptr_r[0], ptr_r[1]}; // left buf_ptr_write[0] = buf_ptr_read[2]; // mid buf_ptr_write[1] = buf_ptr_read[3]; // high // right buf_ptr_write[2] = buf_ptr_write[0]; // mid buf_ptr_write[3] = buf_ptr_write[1]; // high buf_ptr_write += 2 * (I2S_BITS_PER_SAMPLE_16BIT / 8); buf_ptr_read += 2 * (I2S_BITS_PER_SAMPLE_32BIT / 8); } // local echo bytes_written = samples_read * 2 * (I2S_BITS_PER_SAMPLE_16BIT / 8); i2s_write_bytes(I2S_NUM_0, buf, bytes_written, portMAX_DELAY); cnt += samples_read; if(cnt >= 44100) { gettimeofday(&tv, &tz); micros = tv.tv_usec + tv.tv_sec * 1000000; delta = micros - micros_prev; micros_prev = micros; printf("%d samples in %" PRIu64 " usecs\n", cnt, delta); cnt = 0; } } } /** * entry point */ void app_main() { printf("starting app_main()\n"); xTaskCreatePinnedToCore(&task_megaphone, "task_megaphone", 16384, NULL, 20, NULL, 0); }
Code: Select all
#include <driver/i2s.h>
const int sample_rate = 44100;
esp_err_t err1;
esp_err_t err2;
void setup() {
Serial.begin(115200);
delay(100);
Serial.println("Setup I2S ...");
delay(1000);
i2s_install();
i2s_setpin();
delay(500);
}
void loop() {
uint16_t buf_len = 1024;
char *buf = (char*) calloc(buf_len, sizeof(char));
int bytes_written = 0;
int bytes_read = 0;
bytes_read = i2s_read_bytes(I2S_NUM_1, buf, buf_len, 0);
uint32_t samples_read = bytes_read / 2 / (I2S_BITS_PER_SAMPLE_32BIT / 8);
bytes_written = samples_read * 2 * (I2S_BITS_PER_SAMPLE_16BIT / 8);
i2s_write_bytes(I2S_NUM_0, buf, bytes_written, portMAX_DELAY);
}
void i2s_install(){
/* TX: I2S_NUM_0 */
const i2s_config_t i2s_config_tx = {
.mode = i2s_mode_t(I2S_MODE_MASTER | I2S_MODE_TX),
.sample_rate = sample_rate,
.bits_per_sample = i2s_bits_per_sample_t(16),
.channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
.communication_format = i2s_comm_format_t(I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_MSB),
.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1, // default interrupt priority
.dma_buf_count = 32,
.dma_buf_len = 32 * 2,
};
err1 = i2s_driver_install(I2S_NUM_0, &i2s_config_tx, 0, NULL);
if (err1 != ESP_OK) {
Serial.printf("Failed installing driver_1: %d\n", err1);
while (true);
}
/* RX: I2S_NUM_1 */
const i2s_config_t i2s_config_rx = {
.mode = i2s_mode_t(I2S_MODE_MASTER | I2S_MODE_RX),
.sample_rate = sample_rate,
.bits_per_sample = i2s_bits_per_sample_t(32),
.channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
.communication_format = i2s_comm_format_t(I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_MSB),
.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1, // default interrupt priority
.dma_buf_count = 32,
.dma_buf_len = 32 * 2,
};
err2 = i2s_driver_install(I2S_NUM_1, &i2s_config_rx, 0, NULL);
if (err2 != ESP_OK) {
Serial.printf("Failed installing driver_2: %d\n", err2);
while (true);
}
Serial.println("I2S driver installed.");
}
void i2s_setpin(){
/* TX: I2S_NUM_0 */
const i2s_pin_config_t pin_config_tx = {
.bck_io_num = 26,
.ws_io_num = 25,
.data_out_num = 22,
.data_in_num = I2S_PIN_NO_CHANGE };
err1 = i2s_set_pin(I2S_NUM_0, &pin_config_tx);
if (err1 != ESP_OK) {
Serial.printf("Failed setting pin_1: %d\n", err1);
while (true);
}
/* RX: I2S_NUM_1 */
const i2s_pin_config_t pin_config_rx = {
.bck_io_num = 17,
.ws_io_num = 27,
.data_out_num = I2S_PIN_NO_CHANGE,
.data_in_num = 33 };
err2 = i2s_set_pin(I2S_NUM_1, &pin_config_rx);
if (err2 != ESP_OK) {
Serial.printf("Failed setting pin_2: %d\n", err2);
while (true);
}
Serial.println("I2S pins installed.");
}
Code: Select all
#include <driver/i2s.h>
const int sample_rate = 16000; // 44100
esp_err_t err;
uint16_t buf_len = 32; // 1024
uint8_t *buf = (uint8_t*) calloc(buf_len, sizeof(uint8_t));
int bytes_written = 0;
void setup() {
Serial.begin(500000);
delay(100);
Serial.println(" "); Serial.println("Setup I2S ...");
delay(500);
i2s_install();
i2s_setpin();
delay(500);
}
void loop() {
int bytes_read = 0;
while(bytes_read == 0) {
bytes_read = i2s_read_bytes(I2S_NUM_0, buf, buf_len, portMAX_DELAY);
}
delay (1);
i2s_write_bytes(I2S_NUM_0, buf, bytes_read, portMAX_DELAY);
}
void i2s_install(){
const i2s_config_t i2s_config = {
.mode = i2s_mode_t(I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_RX),
.sample_rate = sample_rate,
.bits_per_sample = i2s_bits_per_sample_t(16),
.channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
.communication_format = i2s_comm_format_t(I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_MSB),
.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1, // default interrupt priority
.dma_buf_count = 16, // 32
.dma_buf_len = 64, // 32 * 2
};
err = i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);
if (err != ESP_OK) {
Serial.printf("Failed installing driver_1: %d\n", err);
while (true);
}
Serial.println("I2S driver installed.");
}
void i2s_setpin(){
const i2s_pin_config_t pin_config = {
.bck_io_num = 26,
.ws_io_num = 25,
.data_out_num = 22,
.data_in_num = 33
};
err = i2s_set_pin(I2S_NUM_0, &pin_config);
if (err != ESP_OK) {
Serial.printf("Failed setting pin_1: %d\n", err);
while (true);
}
Serial.println("I2S pins installed."); Serial.println(" ");
}
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