Added simple functions for checking button status

Makefile

@@ -3,8 +3,13 @@ all: clean build
 clean:
 	rm -rf bin/
 
+# The following settings are very important!
+# -c arduino for flashing to an AVR device with arduino bootloader.
+# -p atmega328p is for the specific microcontroller.
+# -b 57600 is the baudrate for transmission. Nano boards ONLY accept 57600, uno boards might accept 115200.
+# -P specifies the port.
 flash: build
-	avrdude -c arduino -p atmega328p -P /dev/ttyUSB0 -b115200 -U flash:w:bin/gympal.hex:i
+	avrdude -c arduino -p atmega328p -P /dev/ttyUSB0 -b 57600 -U flash:w:bin/gympal.hex:i
 
 build: gympal.hex
 

src/control.h

@@ -40,6 +40,16 @@ void ctl_init();
  * @brief Determines if button A has been pressed.
  * @return uint8_t 1 if pressed, 0 otherwise.
  */
-uint8_t ctl_isButtonAPressed();
+inline uint8_t ctl_isButtonAPressed() {
+    return (CTL_INPUT_FLAGS & (1 << CTL_BUTTON_A_FLAG)) >> CTL_BUTTON_A_FLAG;
+}
+
+inline uint8_t ctl_isButtonBPressed() {
+    return (CTL_INPUT_FLAGS & (1 << CTL_BUTTON_B_FLAG)) >> CTL_BUTTON_B_FLAG;
+}
+
+inline uint8_t ctl_isButtonCPressed() {
+    return (CTL_INPUT_FLAGS & (1 << CTL_BUTTON_C_FLAG)) >> CTL_BUTTON_C_FLAG;
+}
 
 #endif

src/gympal.c

@@ -10,7 +10,7 @@ int main() {
     PORTB &= ~(1 << PORTB4);
     uint8_t led = 0;
     while(1) {
-        uint8_t v = (CTL_INPUT_FLAGS & (1 << CTL_BUTTON_B_FLAG)) >> CTL_BUTTON_A_FLAG;
+        uint8_t v = ctl_isButtonAPressed();
         if (led != v) {
             led = v;
             if (led) {