Merge branch 'master' of https://github.com/m5stack/M5Core2 into master

Author: TinyuZhao

src/AXP192.cpp

@@ -551,31 +551,32 @@ void AXP192::SetLCDRSet(bool state)
     Write1Byte(reg_addr, data);
 }
 
+// Select source for BUS_5V
+// 0 : use internal boost
+// 1 : powered externally
 void AXP192::SetBusPowerMode(uint8_t state)
 {
     uint8_t data;
     if (state == 0)
     {
+        // Set GPIO to 3.3V (LDO OUTPUT mode)
         data = Read8bit(0x91);
-        Write1Byte(0x91, (data & 0X0F) | 0XF0);
-
+        Write1Byte(0x91, (data & 0x0F) | 0xF0);
+        // Set GPIO0 to LDO OUTPUT, pullup N_VBUSEN to disable VBUS supply from BUS_5V
         data = Read8bit(0x90);
-        Write1Byte(0x90, (data & 0XF8) | 0X02); //set GPIO0 to LDO OUTPUT , pullup N_VBUSEN to disable supply from BUS_5V
-
-        data = Read8bit(0x91);
-
-        data = Read8bit(0x12);         //read reg 0x12
-        Write1Byte(0x12, data | 0x40); //set EXTEN to enable 5v boost
+        Write1Byte(0x90, (data & 0xF8) | 0x02);
+        // Set EXTEN to enable 5v boost
+        data = Read8bit(0x10);
+        Write1Byte(0x10, data | 0x04);
     }
     else
     {
-        data = Read8bit(0x12);         //read reg 0x10
-        Write1Byte(0x12, data & 0XBF); //set EXTEN to disable 5v boost
-
-        //delay(2000);
-
+        // Set EXTEN to disable 5v boost
+        data = Read8bit(0x10);
+        Write1Byte(0x10, data & ~0x04);
+        // Set GPIO0 to float, using enternal pulldown resistor to enable VBUS supply from BUS_5V
         data = Read8bit(0x90);
-        Write1Byte(0x90, (data & 0xF8) | 0X01); //set GPIO0 to float , using enternal pulldown resistor to enable supply from BUS_5VS
+        Write1Byte(0x90, (data & 0xF8) | 0x07);
     }
 }