mic_plugin_level.tc

mic_plugin_level.tc — read the microphone loudness from the audio BinPlugin

Source on GitHub

// mic_plugin_level.tc — read the microphone loudness from the audio BinPlugin
// (module 42) via pluginQuery, so it COEXISTS with the plugin's audio output.
//
// No native i2sMic here: on a board where the audio plugin owns the full-duplex
// I2S (e.g. the ESP32-P4 display — ES8311 speaker + ES7210 mic), a second
// i2s_new_channel would conflict. Instead we just ask the plugin for the current
// peak level (0..32767), exactly like audio play/vol/say ask it to do things:
//   pluginQuery(buf, 42, 0, 10)   // 10 = I2S_Q_MICLEVEL selector in xdrv_42_i2s
//
// Prereq: the audio plugin (xdrv_42_i2s, USE_MIC) is loaded + running.

char buf[16];
int  level;

void EverySecond() {
    int n = pluginQuery(buf, 42, 0, 10);     // ask audio plugin (mod 42) for the mic peak
    if (n > 0) {
        level = atoi(buf);                   // 0..32767
        addLog("mic level: %d / 32767", level);
        // → drive an LVGL bar, a WS2812, or a web gauge from `level` here.
    } else {
        addLog("mic level: plugin not loaded / no mic");
    }
}

int main() {
    level = 0;
    audioMicGain(50);    // set the ES7210 mic gain to 50% (1..100) — needs ABI-13 firmware
    addLog("mic_plugin_level: polling audio plugin (mod 42) for mic loudness");
    return 0;
}