Fix support for M60 keyboard

- Change BUTTON_2 to ESC and setup related pins properly
- Always enable the battery

Author: hyx0329

src/boards/m60_keyboard/board.h

@@ -43,9 +43,14 @@
  *------------------------------------------------------------------*/
 #define BUTTONS_NUMBER        2
 #define BUTTON_1              _PINNUM(0, 27)
-#define BUTTON_2              _PINNUM(1, 7)
+#define BUTTON_2              _PINNUM(0, 19)  // ESC
 #define BUTTON_PULL           NRF_GPIO_PIN_PULLUP
 
+/*------------------------------------------------------------------*/
+/* On board regulator control
+ *------------------------------------------------------------------*/
+#define LDO_CONTROL_PIN       _PINNUM(0, 28)  // Enables external pwr
+
 //--------------------------------------------------------------------+
 // BLE OTA
 //--------------------------------------------------------------------+

src/boards/m60_keyboard/pinconfig.c

@@ -1,4 +1,5 @@
 #include "boards.h"
+#include "board.h"
 #include "uf2/configkeys.h"
 
 __attribute__((used, section(".bootloaderConfig")))
@@ -17,3 +18,40 @@ const uint32_t bootloaderConfig[] =
   0, 0, 0, 0, 0, 0, 0, 0
   /* CF2 END */
 };
+
+static void power_on(void)
+{
+  // Turn on the regulator
+  nrf_gpio_cfg_output(LDO_CONTROL_PIN);
+  nrf_gpio_pin_write(LDO_CONTROL_PIN, 1);
+}
+
+void board_init2(void)
+{
+  power_on();
+
+  // configure P0.05 for ESC/BUTTON_2
+  // P0.05 --- |<- --- / --- P0.19
+  //         diode  sw(esc)
+  // mode: output, push-pull, low
+  nrf_gpio_cfg(
+    _PINNUM(0, 5),
+    NRF_GPIO_PIN_DIR_OUTPUT,
+    NRF_GPIO_PIN_INPUT_DISCONNECT,
+    NRF_GPIO_PIN_NOPULL,
+    NRF_GPIO_PIN_H0D1,
+    NRF_GPIO_PIN_NOSENSE
+  );
+  nrf_gpio_pin_write(_PINNUM(0, 5), 0);
+
+  // Wait the buttons stable.
+  // This is mandatory, or the keyboard will enter bootloader whenever
+  // booted by pressing the button at back (same with BUTTON_1)
+  NRFX_DELAY_MS(300);
+}
+
+void board_teardown2(void)
+{
+  // re-enable the battery
+  power_on();
+}