Update quantum matrix to support both AVR and Chibios ARM (#3968)

* Update quantum matrix to support both AVR and Chibios ARM

- Addition of STM32 pin definitions
- Created abstruction layer defines to control GPIO (This is a bit pointless for Chibios as we are creating a PAL ontop of a PAL but it is necessary for uniformity with AVR)
- Modified matrix.c to use the above functions

* minor ifdef fix

* Rename of functions and docs

- Added documentation.
- Renamed functions according to Jack's spec.

* Massdrop fix

* Update matrix.c

* Update quantum.h

* Update quantum.h

* Update quantum.h

* Update internals_gpio_control.md

1 files changed, 57 insertions, 12 deletions

diff --git a/quantum/quantum.h b/quantum/quantum.h
index 7cf16d81e..683333211 100644
--- a/quantum/quantum.h
+++ b/quantum/quantum.h
@@ -1,4 +1,4 @@
-/* Copyright 2016-2017 Erez Zukerman, Jack Humbert
+/* Copyright 2016-2018 Erez Zukerman, Jack Humbert, Yiancar
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -17,9 +17,12 @@
 #define QUANTUM_H
 
 #if defined(__AVR__)
-#include <avr/pgmspace.h>
-#include <avr/io.h>
-#include <avr/interrupt.h>
+    #include <avr/pgmspace.h>
+    #include <avr/io.h>
+    #include <avr/interrupt.h>
+#endif
+#if defined(PROTOCOL_CHIBIOS)
+    #include "hal.h"
 #endif
 #include "wait.h"
 #include "matrix.h"
@@ -33,11 +36,11 @@
 #ifdef RGBLIGHT_ENABLE
   #include "rgblight.h"
 #else
-  #ifdef RGB_MATRIX_ENABLE
-    /* dummy define RGBLIGHT_MODE_xxxx */
-    #define RGBLIGHT_H_DUMMY_DEFINE
-    #include "rgblight.h"
-  #endif
+    #ifdef RGB_MATRIX_ENABLE
+        /* dummy define RGBLIGHT_MODE_xxxx */
+        #define RGBLIGHT_H_DUMMY_DEFINE
+        #include "rgblight.h"
+    #endif
 #endif
 
 #ifdef SPLIT_KEYBOARD
@@ -76,9 +79,9 @@ extern uint32_t default_layer_state;
 #ifdef AUDIO_ENABLE
     #include "audio.h"
     #include "process_audio.h"
-  #ifdef AUDIO_CLICKY
-    #include "process_clicky.h"
-  #endif // AUDIO_CLICKY
+    #ifdef AUDIO_CLICKY
+        #include "process_clicky.h"
+    #endif // AUDIO_CLICKY
 #endif
 
 #ifdef STENO_ENABLE
@@ -133,6 +136,48 @@ extern uint32_t default_layer_state;
     #include "hd44780.h"
 #endif
 
+//Function substitutions to ease GPIO manipulation
+#ifdef __AVR__
+    #define pin_t uint8_t
+    #define setPinInput(pin) _SFR_IO8((pin >> 4) + 1) &= ~ _BV(pin & 0xF)
+    #define setPinInputHigh(pin) ({\
+            _SFR_IO8((pin >> 4) + 1) &= ~ _BV(pin & 0xF);\
+            _SFR_IO8((pin >> 4) + 2) |=   _BV(pin & 0xF);\
+            })
+    #define setPinInputLow(pin) _Static_assert(0, "AVR Processors cannot impliment an input as pull low")
+    #define setPinOutput(pin) _SFR_IO8((pin >> 4) + 1) |= _BV(pin & 0xF)
+
+    #define writePinHigh(pin) _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF)
+    #define writePinLow(pin) _SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF)
+    static inline void writePin(pin_t pin, uint8_t level){
+        if (level){
+            _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF);
+        } else {
+            _SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF);
+        }
+    }
+
+    #define readPin(pin) (_SFR_IO8(pin >> 4) & _BV(pin & 0xF))
+#elif defined(PROTOCOL_CHIBIOS)
+    #define pin_t ioline_t
+    #define setPinInput(pin) palSetLineMode(pin, PAL_MODE_INPUT)
+    #define setPinInputHigh(pin) palSetLineMode(pin, PAL_MODE_INPUT_PULLUP)
+    #define setPinInputLow(pin) palSetLineMode(pin, PAL_MODE_INPUT_PULLDOWN)
+    #define setPinOutput(pin) palSetLineMode(pin, PAL_MODE_OUTPUT_PUSHPULL)
+
+    #define writePinHigh(pin) palSetLine(pin)
+    #define writePinLow(pin) palClearLine(pin)
+    static inline void writePin(pin_t pin, uint8_t level){
+        if (level){
+            palSetLine(pin);
+        } else {
+            palClearLine(pin);
+        }
+    }
+
+    #define readPin(pin) palReadLine(pin)
+#endif
+
 #define STRINGIZE(z) #z
 #define ADD_SLASH_X(y) STRINGIZE(\x ## y)
 #define SYMBOL_STR(x) ADD_SLASH_X(x)