Split function setup into block for each peripheral

main.c

@@ -22,13 +22,21 @@
 volatile enum {FORWARD, BACKWARD} direction;
 volatile bool running = false;
 
-void setup (void) {			// All the blackbox code
-
+void setup_system (void) {
 	// Set up clock
 	rcc_clock_setup_in_hse_8mhz_out_24mhz();
+}
 
-	// Enable the two GPIOs
+void setup_gpio_out (void) {
+	// Enable clock for GPIO C
 	rcc_periph_clock_enable(RCC_GPIOC);
+	// GPIO C8 amd C9 are the two LEDs
+	gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO8 | GPIO9);
+
+}
+
+void setup_exti0_in (void) {
+	// Enable clock for GPIO A
 	rcc_periph_clock_enable(RCC_GPIOA);
 
 	// Enable AFIO (we need that to map GPIO to EXTI)
@@ -39,8 +47,6 @@ void setup (void) {			// All the blackbox code
 	// This one is for EXTI0 ~~ GPIOx0 pins
 	nvic_enable_irq(NVIC_EXTI0_IRQ);
 
-	// GPIO C8 amd C9 are the two LEDs
-	gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO8 | GPIO9);
 
 	// GPIO A0 is the push button
 	// And we set it as a regular button and enable its interrupts in the next block
@@ -55,6 +61,12 @@ void setup (void) {			// All the blackbox code
 	exti_enable_request(EXTI0);
 }
 
+void setup (void) {
+	setup_system();
+	setup_gpio_out();
+	setup_exti0_in();
+}
+
 // libopencm3 has a pre-declared interrupt handlers, so it needs to have this name
 void exti0_isr (void) {
 	// Clear the interrupt