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https://github.com/markqvist/RNode_Firmware.git
synced 2026-04-28 09:43:08 +00:00
c31b1908a7
Microphone on I2S_NUM_0 (PDM hardware constraint), speaker moved to I2S_NUM_1. Both init at boot, shut down before deep sleep. Mic provides raw audio read and RMS level measurement. Boot beep disabled (speaker confirmed working).
110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
// MAX98357A I2S Speaker Driver — Minimal tone generator for T-Watch Ultra
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// Plays simple alert tones via I2S. No WAV files needed.
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#ifndef SPEAKER_H
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#define SPEAKER_H
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#if BOARD_MODEL == BOARD_TWATCH_ULT
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#include "driver/i2s.h"
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#include <math.h>
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#define SPK_BCLK I2S_BCLK
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#define SPK_WCLK I2S_WCLK
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#define SPK_DOUT I2S_DOUT
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#define SPK_I2S_PORT I2S_NUM_1 // I2S_NUM_0 reserved for PDM microphone
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#define SPK_SAMPLE_RATE 16000
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#define SPK_TONE_BUF_SIZE 512
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static bool speaker_ready = false;
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bool speaker_init() {
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i2s_config_t i2s_config = {};
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i2s_config.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX);
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i2s_config.sample_rate = SPK_SAMPLE_RATE;
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i2s_config.bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT;
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i2s_config.channel_format = I2S_CHANNEL_FMT_ALL_RIGHT;
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i2s_config.communication_format = I2S_COMM_FORMAT_STAND_I2S;
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i2s_config.dma_buf_count = 4;
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i2s_config.dma_buf_len = 512;
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i2s_config.use_apll = false;
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i2s_config.tx_desc_auto_clear = true;
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i2s_pin_config_t pin_config = {};
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pin_config.bck_io_num = SPK_BCLK;
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pin_config.ws_io_num = SPK_WCLK;
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pin_config.data_out_num = SPK_DOUT;
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pin_config.data_in_num = I2S_PIN_NO_CHANGE;
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if (i2s_driver_install(SPK_I2S_PORT, &i2s_config, 0, NULL) != ESP_OK) {
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return false;
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}
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if (i2s_set_pin(SPK_I2S_PORT, &pin_config) != ESP_OK) {
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i2s_driver_uninstall(SPK_I2S_PORT);
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return false;
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}
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speaker_ready = true;
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return true;
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}
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void speaker_end() {
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if (speaker_ready) {
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i2s_driver_uninstall(SPK_I2S_PORT);
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speaker_ready = false;
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}
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}
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// Play a tone at given frequency (Hz) for given duration (ms) at volume (0-100)
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void speaker_tone(uint16_t freq, uint16_t duration_ms, uint8_t volume) {
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if (!speaker_ready || freq == 0) return;
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float vol = (float)volume / 100.0f;
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int16_t amplitude = (int16_t)(16000 * vol); // ~half of int16 max
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uint32_t total_samples = (uint32_t)SPK_SAMPLE_RATE * duration_ms / 1000;
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int16_t buf[SPK_TONE_BUF_SIZE];
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uint32_t samples_written = 0;
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while (samples_written < total_samples) {
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uint32_t chunk = total_samples - samples_written;
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if (chunk > SPK_TONE_BUF_SIZE) chunk = SPK_TONE_BUF_SIZE;
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for (uint32_t i = 0; i < chunk; i++) {
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float t = (float)(samples_written + i) / (float)SPK_SAMPLE_RATE;
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buf[i] = (int16_t)(amplitude * sinf(2.0f * M_PI * freq * t));
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}
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size_t bytes_written = 0;
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i2s_write(SPK_I2S_PORT, buf, chunk * sizeof(int16_t), &bytes_written, portMAX_DELAY);
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samples_written += chunk;
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}
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// Brief silence to flush DMA buffer
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memset(buf, 0, sizeof(buf));
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size_t dummy;
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i2s_write(SPK_I2S_PORT, buf, sizeof(buf), &dummy, portMAX_DELAY);
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}
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// Predefined alert tones
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void speaker_beep() {
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speaker_tone(1000, 100, 50); // Short 1kHz beep
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}
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void speaker_alert() {
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speaker_tone(800, 200, 70);
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speaker_tone(1200, 200, 70);
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}
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void speaker_success() {
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speaker_tone(523, 100, 40); // C5
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speaker_tone(659, 100, 40); // E5
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speaker_tone(784, 150, 40); // G5
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}
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void speaker_error() {
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speaker_tone(300, 300, 60);
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speaker_tone(200, 400, 60);
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}
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#endif // BOARD_MODEL == BOARD_TWATCH_ULT
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#endif // SPEAKER_H
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