Merge pull request #914 from wez/ble_2

Add arduino-alike GPIO pin control helpers

quantum/pincontrol.h

@@ -0,0 +1,37 @@
+#pragma once
+// Some helpers for controlling gpio pins
+#include <avr/io.h>
+
+enum {
+  PinDirectionInput = 0,
+  PinDirectionOutput = 1,
+  PinLevelHigh = 1,
+  PinLevelLow = 0,
+};
+
+// ex: pinMode(B0, PinDirectionOutput);
+static inline void pinMode(uint8_t pin, int mode) {
+  uint8_t bv = _BV(pin & 0xf);
+  if (mode == PinDirectionOutput) {
+    _SFR_IO8((pin >> 4) + 1) |= bv;
+  } else {
+    _SFR_IO8((pin >> 4) + 1) &= ~bv;
+    _SFR_IO8((pin >> 4) + 2) &= ~bv;
+  }
+}
+
+// ex: digitalWrite(B0, PinLevelHigh);
+static inline void digitalWrite(uint8_t pin, int mode) {
+  uint8_t bv = _BV(pin & 0xf);
+  if (mode == PinLevelHigh) {
+    _SFR_IO8((pin >> 4) + 2) |= bv;
+  } else {
+    _SFR_IO8((pin >> 4) + 2) &= ~bv;
+  }
+}
+
+// Return true if the pin is HIGH
+// digitalRead(B0)
+static inline bool digitalRead(uint8_t pin) {
+  return _SFR_IO8(pin >> 4) & _BV(pin & 0xf);
+}