Add NOP to give time for ICR register write

Blink/main.c

@@ -31,15 +31,15 @@ x   GPIODEN -- GPIO Digital Enable -- 0x00011111 >> 0x1F
     register uint32_t x = ZERO_DEF;
 
 
-    GPIO_PORTF_DATA_R = 0x4;
-//    while(1)
-//    {
-//        GPIO_PORTF_DATA_R = 0x0;
-//        GPIO_PORTF_DATA_R = 0x2;
-//        GPIO_PORTF_DATA_R = 0x4;
-//        GPIO_PORTF_DATA_R = 0x8;
-//        GPIO_PORTF_DATA_R = 0xE;
-//    }
+    GPIO_PORTF_DATA_R = 0xE;
+    while(1)
+    {
+        GPIO_PORTF_DATA_R = 0x0;
+        GPIO_PORTF_DATA_R = 0x2;
+        GPIO_PORTF_DATA_R = 0x4;
+        GPIO_PORTF_DATA_R = 0x8;
+        GPIO_PORTF_DATA_R = 0xE;
+    }
 
 
 
@@ -47,7 +47,6 @@ x   GPIODEN -- GPIO Digital Enable -- 0x00011111 >> 0x1F
     {
         x++;
         counter_loop();
-        GPIO_PORTF_DATA_R ^= 0x2;
     }
 }
 
@@ -61,7 +60,7 @@ void GPIO_PORTF_Init(void)
 
 void counter_loop (void)
 {
-    uint32_t count = 0xFFFFFF;
+    register uint32_t count=10;
     while(count>0)
         count--;
 

GPIO_Interrupts/main.c

@@ -10,12 +10,14 @@ void SystickHandler(void);
 void Systick_Init(void);
 
 volatile uint32_t systick_count = 1;
-volatile uint32_t global_counter = 0;
+
 
 
 int main(void)
 {
 
+
+
     GPIO_PORTF_Init();
     //Systick_Init();
      while(1);
@@ -24,13 +26,20 @@ int main(void)
 
 void SW2_Handler(void)
 {
-    //Start with some nops and then try some dela
+    //GPIO_PORTF_ICR_R = 0x11;
+    if(GPIO_PORTF_MIS_R & 0x01)
+    {
+        //PIN0 (SW2) pressed
+        GPIO_PORTF_DATA_R |=  0x8;
 
-    //GPIO_PORTF_DATA_R ^= 0x2;
-    global_counter ++;
-    //GPIO_PORTF_ICR_R = 0x10;
-    GPIO_PORTF_ICR_R = 0x10;
-    __asm(" DSB");
+    }
+    else if (GPIO_PORTF_MIS_R & 0x10)
+    {
+        GPIO_PORTF_DATA_R &= ~0x8;
+    }
+
+    GPIO_PORTF_ICR_R = 0x11;
+    __asm(" nop");
 }
 
 
@@ -61,6 +70,10 @@ void GPIO_PORTF_Init(void)
     //Need to enable interrupt on SW1
 
     SYSCTL_RCGC2_R |= SYSCTL_RCGC2_GPIOF;
+
+    GPIO_PORTF_LOCK_R = 0x4C4F434B;     /* unlock commit register */
+    GPIO_PORTF_CR_R = 0xFF;             /* make PORTF0 configurable */
+
     GPIO_PORTF_DEN_R  = 0x1F;
     GPIO_PORTF_PUR_R  = 0x11;
     GPIO_PORTF_DIR_R  = 0x0E;
@@ -79,11 +92,11 @@ void GPIO_PORTF_Init(void)
     //GPIOIEV -- Interropt Event  --> 0 for falling edge      --> 0x00
     GPIO_PORTF_IEV_R = 0x0;
 
-    //GPIOICR -- Interript clear -- must be cleared by writing 1 to corresponding bit --> 0xff
+    //GPIOICR -- INterrpt clear -- must be cleared by writing 1 to corresponding bit --> 0xff
     GPIO_PORTF_ICR_R = 0xff;
 
     //GPIOIM -- Interrupt Mask    --> 1 for unmasked (enabled)--> 0x01
-    GPIO_PORTF_IM_R = 0x10;
+    GPIO_PORTF_IM_R = 0x11;
 
     //GPIORIS -- Raw Int Status
     //GPIOMIS -- Masked Int Status