Earle F. Philhower, III
01e9dc99f2
Provide direct connection from BT audio to I2S and PWM audio outputs. Example included showing play/pause operation.
101 lines
2.8 KiB
Arduino
101 lines
2.8 KiB
Arduino
// Plays tones and Au Claire De La Lune over an A2DP connection
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// Released to the public domain by Earle Philhower <earlephilhowwer@yahoo.com>
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#include <BluetoothAudio.h>
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#include "raw.h"
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A2DPSource a2dp;
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int16_t pcm[64 * 2];
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uint32_t phase = 0;
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volatile uint32_t fr = 32;
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volatile uint32_t fl = 16;
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volatile bool paused = false;
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volatile bool playwav = false;
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void avrcpCB(void *param, avrcp_operation_id_t op, int pressed) {
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(void) param;
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if (pressed && op == AVRCP_OPERATION_ID_FORWARD) {
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// Change the sound when they hit play
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fr = random(8, 64);
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fl = random(8, 64);
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Serial.printf("Now generating %lu, %lu\n", fr, fl);
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} else if (pressed && op == AVRCP_OPERATION_ID_PLAY) {
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paused = !paused;
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if (paused) {
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Serial.printf("Pausing\n");
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} else {
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Serial.printf("Resuming\n");
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}
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} else if (pressed && op == AVRCP_OPERATION_ID_BACKWARD) {
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playwav = !playwav;
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Serial.println(playwav ? "Playing 'Au Claire De La Lune'" : "Playing tones");
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}
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}
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void volumeCB(void *param, int pct) {
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(void) param;
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Serial.printf("Speaker volume changed to %d%%\n", pct);
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}
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void connectCB(void *param, bool connected) {
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(void) param;
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if (connected) {
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Serial.printf("A2DP connection started to %s\n", bd_addr_to_str(a2dp.getSinkAddress()));
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} else {
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Serial.printf("A2DP connection stopped\n");
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}
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}
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void fillPCM() {
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if (paused) {
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bzero(pcm, sizeof(pcm));
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return;
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}
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if (playwav) {
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for (int i = 0; i < 64; i++) {
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// Audio in flash is 8-bit signed mono, so shift left to make 16-bit and then play over both channels
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pcm[i * 2] = auclairedelalune_raw[(i + phase) % sizeof(auclairedelalune_raw)] << 8;
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pcm[i * 2 + 1] = auclairedelalune_raw[(i + phase) % sizeof(auclairedelalune_raw)] << 8;
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}
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} else {
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for (int i = 0; i < 64; i++) {
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pcm[i * 2] = ((i + phase) / fr) & 1 ? 3000 : -3000;
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pcm[i * 2 + 1] = ((i + phase) / fl) & 1 ? 1000 : -1000;
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}
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}
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phase += 64;
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}
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void setup() {
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delay(2000);
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a2dp.onAVRCP(avrcpCB);
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a2dp.onVolume(volumeCB);
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a2dp.onConnect(connectCB);
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a2dp.begin();
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Serial.printf("Starting, press BOOTSEL to pair to first found speaker\n");
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Serial.printf("Use the forward button on speaker to change tones\n");
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Serial.printf("Use the reverse button on speaker to alternate between tones and Au Claire De La Lune\n");
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Serial.printf("Use the play button on speaker to pause/unpause the tone\n");
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}
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void loop() {
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while ((size_t)a2dp.availableForWrite() > sizeof(pcm)) {
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fillPCM();
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a2dp.write((const uint8_t *)pcm, sizeof(pcm));
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}
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if (BOOTSEL) {
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while (BOOTSEL) {
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delay(1);
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}
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a2dp.disconnect();
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a2dp.clearPairing();
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Serial.printf("Connecting...");
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if (a2dp.connect()) {
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Serial.printf("Connected!\n");
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} else {
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Serial.printf("Failed! :(\n");
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}
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}
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}
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