Started with implementation of pin_create

src/io.s

@@ -6,6 +6,39 @@
 //R0: address to pin struct, R1: address to GPIO, R2: pinnr (1 byte). No return value
 pin_create:
 
+    .set OFFSET_MODR, 0
+    .set OFFSET_OTYPER, 0x4
+    .set OFFSET_PUPDR, 0xC 
+    .set GPIO_MODE_IN, 0
+
+    MOV r5, #3 //r5 = 3
+    LSL r4, r2, #1 //r4 = pinnr*2
+    LSL r5, r5, r4 //r5 = 3 << (pinnr*2)
+
+    //GPIO->MODER &=~ ( 3 << (pinnr*2)); //Clear the 2 bits (mode)
+    LDR r3, [r1, #OFFSET_MODR] //r3 = GPIO->MODR 
+    BIC r3, r3, r5 //r3 &= ~r5
+
+    //GPIO->MODER |= GPIO_Mode_IN << (pinnr*2); //Set the correct bits for mode
+    MOV r5, #GPIO_MODE_IN
+    LSL r5, r5, r4 //r5 = GPIO_MODE_IN << (pinnr*2) 
+    ORR r3, r3, r5 //r3 |= r5
+    STR r3, [r1, #OFFSET_MODR] //GPIO->MODR = r3
+
+    //GPIO->OTYPER &=~ (1 << (pinnr*2)); //Clear the bit (otype)
+    
+    
+    //GPIO->OTYPER |= GPIO_OType_OD <<(pinnr*2); //set the correct bit for otype
+/*    
+    GPIO->PUPDR &=~  (3 <<(pinnr*2)); //clear the 2 bits (pp/od)
+    GPIO->PUPDR |= GPIO_PuPd_UP <<(pinnr*2); //set the correct bits for pp/od
+
+    pin->GPIO=GPIO; // Set the gpiopin in the pin structure
+    pin->pinmask=0x01<<pinnr; // Insert the pinmask
+*/
+
+
+
     //TODO: Implement
 
 end_pin_create: