Final version of TuningFork.c

Labware/Lab12_TuningFork/TuningFork.c

@@ -42,48 +42,75 @@ void DisableInterrupts(void); // Disable interrupts
 void EnableInterrupts(void);  // Enable interrupts
 void WaitForInterrupt(void);  // low power mode
 
-unsigned long flag = 0;
-unsigned long temp = 0;
-unsigned long lastState = 0;
+unsigned long Switch = 0;
+unsigned char switchPressedLastTime = 0;
+unsigned char toggle = 0;
 
 // input from PA3, output from PA2, SysTick interrupts
 void Sound_Init(void){ 
-  unsigned long delay;
-  SYSCTL_RCGC2_R |= 0x00000001; // activate port A
+	unsigned long volatile delay;
+	SYSCTL_RCGC2_R |= 0x01;
 	delay = SYSCTL_RCGC2_R;
-  GPIO_PORTA_AMSEL_R &= ~0x20;      // no analog
-  GPIO_PORTA_PCTL_R &= ~0x000F0000; // regular function
-  GPIO_PORTA_DIR_R |= 0x20;     // make PA5 out
-  GPIO_PORTA_DR8R_R |= 0x20;    // can drive up to 8mA out
-  GPIO_PORTA_AFSEL_R &= ~0x20;  // disable alt funct on PA5
-  GPIO_PORTA_DEN_R |= 0x20;     // enable digital I/O on PA5
+	GPIO_PORTA_DEN_R &= ~0x08;
+	GPIO_PORTA_DIR_R &= ~0x08; // MAKE PA2 A OUTPUT
+	GPIO_PORTA_DIR_R |= 0x04; // MAKE PA3 A INPUT
+	GPIO_PORTA_AFSEL_R &= ~0x08; //DIASBLE ALT FUNCTION ON PA2 AND PA3
+	GPIO_PORTA_AFSEL_R &= ~0x04;
+	GPIO_PORTA_DEN_R |= 0x0C; // ENABLE DIGITAL I/O ON PA2 AND PA3
+	GPIO_PORTA_AMSEL_R &= ~0x08; /// DISABLE ANALOG FUNCTIONALITY OF PA
+	GPIO_PORTA_AMSEL_R &= ~0x04;
+	GPIO_PORTA_PCTL_R &= ~0x0000FF00;
 	NVIC_ST_CTRL_R = 0; // disable SysTick during setup
-  NVIC_ST_RELOAD_R = 39999;     // reload value for 500us (assuming 80MHz)
+	NVIC_ST_RELOAD_R = 90908; // reload value
 	NVIC_ST_CURRENT_R = 0; // any write to current clears it
-  NVIC_SYS_PRI3_R = NVIC_SYS_PRI3_R&0x00FFFFFF; // priority 0               
-  NVIC_ST_CTRL_R = 0x00000007;  // enable with core clock and interrupts
+	NVIC_SYS_PRI3_R = (NVIC_SYS_PRI3_R&0x00FFFFFF)|0x40000000;
+	NVIC_ST_CTRL_R = 0x07;
 	EnableInterrupts();
 }
 
 // called at 880 Hz
 void SysTick_Handler(void){
-  if(flag==1)
+		if (toggle) {
 			GPIO_PORTA_DATA_R ^= 0x04;
-	else GPIO_PORTA_DATA_R &= ~0x04;
+		}
+		else {
+			GPIO_PORTA_DATA_R &= ~0x04;
+		}
 }
 
 int main(void){// activate grader and set system clock to 80 MHz
+	unsigned char flag = 0;
+	
   TExaS_Init(SW_PIN_PA3, HEADPHONE_PIN_PA2,ScopeOn); 
   Sound_Init();
+	Switch = (GPIO_PORTA_DATA_R &0x08);
   EnableInterrupts();   // enable after all initialization are done
+
   while(1){
 		// main program is free to perform other tasks
     // do not use WaitForInterrupt() here, it may cause the TExaS to crash
-    temp = GPIO_PORTA_DATA_R & 0x08;
-		if(temp == 0x08 && lastState == 0x00)
-		{
-			flag ^= 1;
+
+		while (Switch == 0x08 && flag ==0) {
+			Switch = (GPIO_PORTA_DATA_R &0x08);
+			GPIO_PORTA_DATA_R = 0x00;  
+			toggle = 0 ;
+		}
+		while (Switch == 0x00 && flag == 0) {
+			Switch = (GPIO_PORTA_DATA_R &0x08);
+			toggle = 0 ;
 		}
-		lastState = temp;
+		
+		flag = 1;
+		while (Switch == 0x08 && flag == 1) {
+			Switch = (GPIO_PORTA_DATA_R &0x08);
+			toggle = 1; // Loop till switch pressed off
+		}
+
+		while (Switch == 0x00 && flag == 1){
+			Switch = (GPIO_PORTA_DATA_R &0x08);
+			toggle = 1; // Sound
+		}
+
+		flag = 0;
 	}
 }