From 5928e7cb07a84d3382aad810adae4449caf25229 Mon Sep 17 00:00:00 2001
From: Tinyu <tinyu0806@gmail.com>
Date: Fri, 17 Jul 2026 18:31:54 +0800
Subject: [PATCH] Add Paper Mono microphone power support

---
 src/M5Unified.cpp | 24 ++++++++++++++++++++++++
 src/M5Unified.hpp |  1 +
 2 files changed, 25 insertions(+)

diff --git a/src/M5Unified.cpp b/src/M5Unified.cpp
index 2e1d675..7458a43 100644
--- a/src/M5Unified.cpp
+++ b/src/M5Unified.cpp
@@ -1051,6 +1051,29 @@ static constexpr const uint8_t _pin_table_mbus[][31] = {
     return true;
   }
 
+  bool M5Unified::_microphone_enabled_cb_papermono(void* args, bool enabled)
+  {
+#if defined (CONFIG_IDF_TARGET_ESP32S3)
+    auto self = (M5Unified*)args;
+    auto& ioe1 = self->getIOExpander(0);
+    bool result = true;
+    if (enabled)
+    {
+      // The factory firmware enables PM1 BOOST before powering the PDM mic.
+      result = self->Power.M5pm1.setExtOutput(true);
+    }
+    // M5IOE1 GPIO12 is the Paper Mono PDM microphone power enable.
+    ioe1.setHighImpedance(M5IOE1_Class::gpio12, false);
+    ioe1.setDirection(M5IOE1_Class::gpio12, true);
+    ioe1.digitalWrite(M5IOE1_Class::gpio12, enabled);
+    return result;
+#else
+    (void)args;
+    (void)enabled;
+#endif
+    return true;
+  }
+
 
   bool M5Unified::_microphone_enabled_cb_stopwatch(void* args, bool enabled)
   {
@@ -2213,6 +2236,7 @@ static constexpr const uint8_t _pin_table_mbus[][31] = {
         { /// builtin PDM mic
           mic_cfg.pin_ws = GPIO_NUM_45;
           mic_cfg.pin_data_in = GPIO_NUM_46;
+          mic_enable_cb = _microphone_enabled_cb_papermono;
         }
       break;
 
diff --git a/src/M5Unified.hpp b/src/M5Unified.hpp
index 03fa01d..093f364 100644
--- a/src/M5Unified.hpp
+++ b/src/M5Unified.hpp
@@ -670,6 +670,7 @@ namespace m5
     static bool _microphone_enabled_cb_stickc(void* args, bool enabled);
     static bool _microphone_enabled_cb_sticks3(void* args, bool enabled);
     static bool _microphone_enabled_cb_papercolor(void* args, bool enabled);
+    static bool _microphone_enabled_cb_papermono(void* args, bool enabled);
     static bool _microphone_enabled_cb_stopwatch(void* args, bool enabled);
     static bool _microphone_enabled_cb_chain_captain(void* args, bool enabled);
     static bool _microphone_enabled_cb_tab5(void* args, bool enabled);