b35d9002f3
When I2S `i2s_comm_format_t` is set to `I2S_COMM_FORMAT_I2S_MSB`, the data should launch at first BCK. But not in fact, this MR fixed this issue.
For compatibility, several nwe parameters have been added, and the old parameters will be removed in the future.
closes https://github.com/espressif/esp-idf/issues/5065
closes https://github.com/espressif/esp-idf/issues/4957
closes https://github.com/espressif/esp-idf/issues/2978
closes https://github.com/espressif/esp-idf/issues/5136
Merges https://github.com/espressif/esp-idf/pull/4522
119 lines
4 KiB
C
119 lines
4 KiB
C
/* I2S Example
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This example code will output 100Hz sine wave and triangle wave to 2-channel of I2S driver
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Every 5 seconds, it will change bits_per_sample [16, 24, 32] for i2s data
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include <stdio.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "driver/i2s.h"
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#include "driver/gpio.h"
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#include "esp_system.h"
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#include <math.h>
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#define SAMPLE_RATE (36000)
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#define I2S_NUM (0)
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#define WAVE_FREQ_HZ (100)
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#define PI (3.14159265)
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#define I2S_BCK_IO (GPIO_NUM_13)
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#define I2S_WS_IO (GPIO_NUM_15)
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#define I2S_DO_IO (GPIO_NUM_21)
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#define I2S_DI_IO (-1)
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#define SAMPLE_PER_CYCLE (SAMPLE_RATE/WAVE_FREQ_HZ)
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static void setup_triangle_sine_waves(int bits)
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{
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int *samples_data = malloc(((bits+8)/16)*SAMPLE_PER_CYCLE*4);
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unsigned int i, sample_val;
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double sin_float, triangle_float, triangle_step = (double) pow(2, bits) / SAMPLE_PER_CYCLE;
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size_t i2s_bytes_write = 0;
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printf("\r\nTest bits=%d free mem=%d, written data=%d\n", bits, esp_get_free_heap_size(), ((bits+8)/16)*SAMPLE_PER_CYCLE*4);
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triangle_float = -(pow(2, bits)/2 - 1);
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for(i = 0; i < SAMPLE_PER_CYCLE; i++) {
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sin_float = sin(i * 2 * PI / SAMPLE_PER_CYCLE);
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if(sin_float >= 0)
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triangle_float += triangle_step;
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else
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triangle_float -= triangle_step;
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sin_float *= (pow(2, bits)/2 - 1);
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if (bits == 16) {
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sample_val = 0;
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sample_val += (short)triangle_float;
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sample_val = sample_val << 16;
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sample_val += (short) sin_float;
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samples_data[i] = sample_val;
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} else if (bits == 24) { //1-bytes unused
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samples_data[i*2] = ((int) triangle_float) << 8;
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samples_data[i*2 + 1] = ((int) sin_float) << 8;
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} else {
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samples_data[i*2] = ((int) triangle_float);
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samples_data[i*2 + 1] = ((int) sin_float);
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}
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}
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i2s_set_clk(I2S_NUM, SAMPLE_RATE, bits, 2);
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//Using push
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// for(i = 0; i < SAMPLE_PER_CYCLE; i++) {
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// if (bits == 16)
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// i2s_push_sample(0, &samples_data[i], 100);
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// else
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// i2s_push_sample(0, &samples_data[i*2], 100);
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// }
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// or write
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i2s_write(I2S_NUM, samples_data, ((bits+8)/16)*SAMPLE_PER_CYCLE*4, &i2s_bytes_write, 100);
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free(samples_data);
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}
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void app_main(void)
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{
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//for 36Khz sample rates, we create 100Hz sine wave, every cycle need 36000/100 = 360 samples (4-bytes or 8-bytes each sample)
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//depend on bits_per_sample
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//using 6 buffers, we need 60-samples per buffer
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//if 2-channels, 16-bit each channel, total buffer is 360*4 = 1440 bytes
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//if 2-channels, 24/32-bit each channel, total buffer is 360*8 = 2880 bytes
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i2s_config_t i2s_config = {
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.mode = I2S_MODE_MASTER | I2S_MODE_TX, // Only TX
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.sample_rate = SAMPLE_RATE,
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.bits_per_sample = 16,
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.channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT, //2-channels
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.communication_format = I2S_COMM_FORMAT_STAND_MSB,
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.dma_buf_count = 6,
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.dma_buf_len = 60,
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.use_apll = false,
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.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1 //Interrupt level 1
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};
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i2s_pin_config_t pin_config = {
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.bck_io_num = I2S_BCK_IO,
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.ws_io_num = I2S_WS_IO,
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.data_out_num = I2S_DO_IO,
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.data_in_num = I2S_DI_IO //Not used
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};
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i2s_driver_install(I2S_NUM, &i2s_config, 0, NULL);
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i2s_set_pin(I2S_NUM, &pin_config);
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int test_bits = 16;
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while (1) {
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setup_triangle_sine_waves(test_bits);
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vTaskDelay(5000/portTICK_RATE_MS);
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test_bits += 8;
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if(test_bits > 32)
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test_bits = 16;
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}
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}
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