Modify: Suppress the mosquito noise that LCD backlight PWM emits. (#147)

lovyan03 · zhouyangyale · commit 7df04204d8a0 · 2019-04-17T10:17:13.000+08:00
Revert: "reduce noise" commit 59340bc.
diff --git a/src/M5Display.cpp b/src/M5Display.cpp
@@ -10,7 +10,7 @@ void M5Display::begin() {
   fillScreen(0);
 
   // Init the back-light LED PWM
-  ledcSetup(BLK_PWM_CHANNEL, 10000, 8);
+  ledcSetup(BLK_PWM_CHANNEL, 44100, 8);
   ledcAttachPin(TFT_BL, BLK_PWM_CHANNEL);
   ledcWrite(BLK_PWM_CHANNEL, 80);
 }
diff --git a/src/M5Stack.cpp b/src/M5Stack.cpp
@@ -25,7 +25,6 @@ void M5Stack::begin(bool LCDEnable, bool SDEnable, bool SerialEnable, bool I2CEn
   // LCD INIT
   if (LCDEnable == true) {
     Lcd.begin();
-	dacWrite(SPEAKER_PIN, 0);
   }
 
   // TF Card
@@ -34,7 +33,7 @@ void M5Stack::begin(bool LCDEnable, bool SDEnable, bool SerialEnable, bool I2CEn
   }
 
   // TONE
-  //Speaker.begin();
+  // Speaker.begin();
 
   // Set wakeup button
   Power.setWakeupButton(BUTTON_A_PIN);

Original file line number	Diff line number	Diff line change
`@@ -10,7 +10,7 @@ void M5Display::begin() {`
`10`	`10`	`fillScreen(0);`
`11`	`11`
`12`	`12`	`// Init the back-light LED PWM`
`13`		`- ledcSetup(BLK_PWM_CHANNEL, 10000, 8);`
	`13`	`+ ledcSetup(BLK_PWM_CHANNEL, 44100, 8);`
`14`	`14`	`ledcAttachPin(TFT_BL, BLK_PWM_CHANNEL);`
`15`	`15`	`ledcWrite(BLK_PWM_CHANNEL, 80);`
`16`	`16`	`}`
Original file line number	Diff line number	Diff line change
`@@ -25,7 +25,6 @@ void M5Stack::begin(bool LCDEnable, bool SDEnable, bool SerialEnable, bool I2CEn`
`25`	`25`	`// LCD INIT`
`26`	`26`	`if (LCDEnable == true) {`
`27`	`27`	`Lcd.begin();`
`28`		`- dacWrite(SPEAKER_PIN, 0);`
`29`	`28`	`}`
`30`	`29`
`31`	`30`	`// TF Card`
`@@ -34,7 +33,7 @@ void M5Stack::begin(bool LCDEnable, bool SDEnable, bool SerialEnable, bool I2CEn`
`34`	`33`	`}`
`35`	`34`
`36`	`35`	`// TONE`
`37`		`- //Speaker.begin();`
	`36`	`+ // Speaker.begin();`
`38`	`37`
`39`	`38`	`// Set wakeup button`
`40`	`39`	`Power.setWakeupButton(BUTTON_A_PIN);`