From 07cc45d86113533bd47500d6bc8929b06b71b073 Mon Sep 17 00:00:00 2001
From: Neil McKechnie <neilmck999@gmail.com>
Date: Thu, 16 Sep 2021 12:39:51 +0100
Subject: [PATCH] Update IO_DFPlayer.h

Fix volume control command.
---
 IO_DFPlayer.h | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/IO_DFPlayer.h b/IO_DFPlayer.h
index 4072cae..061cd3f 100644
--- a/IO_DFPlayer.h
+++ b/IO_DFPlayer.h
@@ -126,7 +126,7 @@ protected:
   // If value is zero, it stops playing.
   // WriteAnalogue on second pin sets the output volume.
   void _writeAnalogue(VPIN vpin, int value, uint8_t, uint16_t) override { 
-    uint8_t pin = _firstVpin - vpin;
+    uint8_t pin = vpin - _firstVpin;
     switch (pin) {
       case 0: 
         if (value > 0) {
@@ -159,13 +159,12 @@ protected:
     }
   }
 
-  bool _isBusy(VPIN vpin) override {
-    (void)vpin;  // avoid compiler warning.
+  bool _isBusy(VPIN) override {
     return _playing;
   }
 
   void _display() override {
-    DIAG(F("DFPlayer Configured on Vpins:%d-%d"));
+    DIAG(F("DFPlayer Configured on Vpins:%d-%d"), _firstVpin, _firstVpin+_nPins-1);
   }
   
 private: