Moved some stuff of io.s back to a c file. Buttons T0-T3 are working now.

src/io_c.c

@@ -0,0 +1,58 @@
+#include <stm32f4xx.h>
+#include <carme_io2.h>
+#include "io.h"
+
+
+typedef struct pin_s {
+    GPIO_TypeDef* GPIO;
+    uint16_t pinmask;
+} pin_t;
+
+// Local variables
+static pin_t pin_t0;
+static pin_t pin_t1;
+static pin_t pin_t2;
+static pin_t pin_t3;
+static uint8_t new = 0;
+static uint8_t old = 0;
+static volatile uint8_t edg = 0;
+
+//Function prototypes of functions that are implemented in asm
+void pin_create(pin_t* pin, GPIO_TypeDef* GPIO, uint8_t pinnr);
+bool pin_get(pin_t* pin);
+bool adc_init();
+
+
+void io_process(void) {
+    new = pin_get(&pin_t0)      |
+          pin_get(&pin_t1) << 1 |
+          pin_get(&pin_t2) << 2 |
+          pin_get(&pin_t3) << 3;
+
+    edg |= (new ^ old) & new;    // detect positive edge
+    old = new;
+}
+
+bool io_button_has_edge(uint8_t btnnumber) {
+    uint8_t bm      = (1 << btnnumber); // create bitmask
+    bool status     = ((edg & bm) > 0); // check if button is pressed
+    
+    if(status){
+        edg &= ~bm; // clear edge bit
+    }
+
+    return status;
+}
+
+void io_init(void){
+    //RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOC,ENABLE); // Enable gpio clock source
+    RCC->AHB1ENR|= RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB | RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_GPIOI;
+    // Create player pins
+    pin_create(&pin_t0, GPIOC, 7);  // create pin_t0
+    pin_create(&pin_t1, GPIOB, 15); // create pin_t1
+    pin_create(&pin_t2, GPIOB, 14); // create pin_t2
+    pin_create(&pin_t3, GPIOI, 0);  // create pin_t3
+
+    adc_init();
+
+}