From e1c1e52d640bfff5d25de7b237df13ab978fa8b7 Mon Sep 17 00:00:00 2001
From: Stephan Hadinger <stephan.hadinger@gmail.com>
Date: Sat, 23 Apr 2022 09:28:16 +0200
Subject: [PATCH] AXP192 driver for M5Stack Tough

---
 .../berry/drivers/i2c_axp192_M5StackTough.be  | 151 ++++++++++++++++++
 1 file changed, 151 insertions(+)
 create mode 100644 tasmota/berry/drivers/i2c_axp192_M5StackTough.be

diff --git a/tasmota/berry/drivers/i2c_axp192_M5StackTough.be b/tasmota/berry/drivers/i2c_axp192_M5StackTough.be
new file mode 100644
index 000000000..cace43a89
--- /dev/null
+++ b/tasmota/berry/drivers/i2c_axp192_M5StackTough.be
@@ -0,0 +1,151 @@
+#-------------------------------------------------------------
+ - Specialized driver for AXP192 of M5Stack Tough
+ -------------------------------------------------------------#
+class AXP192_M5Stack_Tough : AXP192
+  def init()
+    super(self).init()
+
+    if self.wire
+      self.touch_reset(false)
+
+      # Disable vbus hold limit
+      self.write8(0x30, self.read8(0x30) & 0x04 | 0x02)
+
+      # AXP192 GPIO1:OD OUTPUT
+      self.write8(0x92, self.read8(0x92) & 0xF8)
+
+      # AXP192 GPIO2:OD OUTPUT
+      self.write8(0x93, self.read8(0x93) & 0xF8)
+
+      # AXP192 RTC CHG rtc battery charging enabled
+      self.write8(0x35, self.read8(0x35) & 0x1C | 0xA2)
+
+      # esp32 power voltage was set to 3.35v
+      self.set_esp_voltage(3350)
+
+      # lcd backlight voltage was set to 2.80v
+      self.set_lcd_voltage(2800)
+
+      # lcd logic and sdcard voltage preset to 3.3v
+      self.set_ldo_voltage(2, 3300)
+
+      # LCD backlight
+      self.set_ldo_voltage(3, 3000)
+
+      # turn on logic and sdcard
+      self.set_ldo_enable(2, true)
+
+      # turn on lcd backlight
+      self.set_ldo_enable(3, true)
+  
+      self.touch_reset(true)
+
+      # set charging current to 100mA
+      self.set_chg_current(0) # 0 = 100mA
+
+      # AXP192 GPIO4 - TBC what this does really?
+      self.write8(0x95, self.read8(0X95) & 0x72 | 0x84)
+  
+      # Button parameter setting
+      # Current:
+      #   Boot time = 512ms
+      #   Long key press time setting = 1s
+      #   Automatic shutdown function setting when the key duration is longer than the shutdown duration = turn on
+      #   PWROK signal delay after power on = 64ms
+      #   Shutdown duration setting = 4s
+      self.write8(0x34, 0x4C)
+  
+      # parameter buttons
+      #  Start time: 512ms
+      #  Long press: 1s
+      #  Set the automatic shutdown function when the key-press duration is longer than the shutdown duration: True
+      #  PWROK signal delay after power on: 64ms
+      #  Shutdown time setting: 4s
+      self.write8(0x36, 0x4C)
+
+      # ADC all-on
+      # Bit 7: Battery voltage ADC enable
+      # Bit 6: Battery current ADC enable
+      # Bit 5: ACIN voltage ADC enable
+      # Bit 4: ACIN current ADC enable
+      # Bit 3: VBUS voltage ADC enable
+      # Bit 2: VBUS current ADC enable
+      # Bit 1: APS voltage ADC enable
+      # Bit 0: TS pin ADC function enable
+      self.write8(0x82, 0xFF)
+  
+      # Reset LCD Controller
+      self.set_lcd_reset(false)
+      tasmota.delay(100)   # wait for 100ms
+      self.set_lcd_reset(true)
+      tasmota.delay(100)   # wait for 100ms
+
+      # Indicates whether the voltage of VBUS is higher than VHOLD when the external power supply VBUS is connected
+      if self.read8(0x00) & 0x08
+        self.write_bit(0x30, 7, true)
+        # if v-bus can use, disable M-Bus 5V output to input
+        self.set_buf_power_mode(true)
+      else
+        self.set_buf_power_mode(false)
+      end
+    end
+  end
+
+  # set ESP voltage on DCDC1
+  def set_esp_voltage(voltage)
+    if voltage >= 3000 && voltage <= 3400
+      self.set_dc_voltage(0, voltage)
+    end
+  end
+
+  # set LCD backlight voltage on DCDC3
+  def set_lcd_voltage(voltage)
+    if voltage < 2500  voltage = 2500 end
+    if voltage > 3300  voltage = 3300 end
+    self.set_dc_voltage(2, voltage)
+  end
+
+  # LCD Controller Reset pin
+  def set_lcd_reset(state)
+    self.write_gpio(4, state)
+  end
+
+  # Speaker enable
+  def set_speaker_enable(state)
+    self.write_gpio(2, state)
+  end
+
+  # Bus Power Mode
+  def set_buf_power_mode(state)
+    if (state)
+      self.write8(0x12, self.read8(0x12) & 0xBF)          # set EXTEN to disable 5v boost
+      self.write8(0x90, self.read8(0x90) & 0xF8 | 0x01)   # set GPIO0 to float, using enternal pulldown resistor to enable supply from BUS_5VS
+    else
+      self.write8(0x91, self.read8(0x91) & 0x0F | 0xF0)
+      self.write8(0x90, self.read8(0x90) & 0xF8 | 0x02)   # set GPIO0 to LDO OUTPUT , pullup N_VBUSEN to disable supply from BUS_5V
+      self.write8(0x12, self.read8(0x12) | 0x40)          # set EXTEN to enable 5v boost
+    end
+  end
+
+  # Dimmer in percentage
+  def set_displaydimmer(x)
+    var v = tasmota.scale_uint(x, 0, 100, 2500, 3300)
+    self.set_ldo_voltage(3, v)
+  end
+
+  # respond to display events
+  def display(cmd, idx, payload, raw)
+    if cmd == "dim" || cmd == "power"
+      self.set_displaydimmer(idx)
+    end
+  end
+
+  # Touch Panel reset pin
+  def touch_reset(state)
+    self.write_gpio(1, state)
+ end
+
+end
+
+axp = AXP192_M5Stack_Tough()
+tasmota.add_driver(axp)