79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
#include "speaker.h"
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static i2s_chan_handle_t tx_chan;
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static const char *TAG = "speaker_driver";
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esp_err_t play_raw(const char *fp) {
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FILE *fh = fopen(fp, "rb");
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if (fh == NULL)
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{
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ESP_LOGE(TAG, "Failed to open file");
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return ESP_ERR_INVALID_ARG;
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}
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// create a writer buffer
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uint8_t *read_buf = (uint8_t*) calloc(AUDIO_BUFFER, sizeof(uint8_t));
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uint16_t *write_buf = (uint16_t*) calloc(AUDIO_BUFFER, sizeof(uint16_t));
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size_t bytes_read = 0;
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size_t bytes_written = 0;
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ESP_ERROR_CHECK(i2s_channel_enable(tx_chan));
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bytes_read = fread(read_buf, sizeof(uint8_t), AUDIO_BUFFER, fh);
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for (int i = 0; i < bytes_read; i++) {
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write_buf[i] = read_buf[i] << 4;
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}
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// i2s_channel_enable(tx_handle);
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while (bytes_read > 0) {
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// write the buffer to the i2s
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// ESP_LOGI(TAG, "Writing: ");
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// for (int i = 0; i < words_read; i++) {
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// int16_t val = buf[i];
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// printf("%s0x%04X ", (val < 0 ? "-" : "+"), (val < 0 ? -val : val));
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// }>
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i2s_channel_write(tx_chan, write_buf, bytes_read * sizeof(int16_t), &bytes_written, portMAX_DELAY);
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bytes_read = fread(read_buf, sizeof(uint8_t), AUDIO_BUFFER, fh);
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for (int i = 0; i < bytes_read; i++) {
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write_buf[i] = read_buf[i] << 4;
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}
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vTaskDelay(pdMS_TO_TICKS(10));
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}
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i2s_channel_disable(tx_chan);
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free(read_buf);
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free(write_buf);
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fclose(fh);
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return ESP_OK;
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}
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void init_speaker(void) {
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i2s_chan_config_t tx_chan_cfg = I2S_CHANNEL_DEFAULT_CONFIG(I2S_NUM_AUTO, I2S_ROLE_MASTER);
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ESP_ERROR_CHECK(i2s_new_channel(&tx_chan_cfg, &tx_chan, NULL));
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i2s_std_config_t tx_std_cfg = {
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.clk_cfg = I2S_STD_CLK_DEFAULT_CONFIG(SAMPLE_RATE),
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.slot_cfg = I2S_STD_MSB_SLOT_DEFAULT_CONFIG(I2S_DATA_BIT_WIDTH_16BIT, I2S_SLOT_MODE_MONO),
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.gpio_cfg = {
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.mclk = I2S_GPIO_UNUSED,
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.bclk = SPEAKER_PIN_BCLK,
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.ws = SPEAKER_PIN_WS,
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.dout = SPEAKER_PIN_DOUT,
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.din = GPIO_NUM_NC,
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.invert_flags = {
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.mclk_inv = false,
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.bclk_inv = false,
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.ws_inv = false,
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},
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},
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};
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ESP_ERROR_CHECK(i2s_channel_init_std_mode(tx_chan, &tx_std_cfg));
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}
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void play_example() {
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ESP_ERROR_CHECK_WITHOUT_ABORT(play_raw("/sdcard/o.pcm"));
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}
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