Final version of TuningFork.c

65bcb57a · vielex · 8d194d6c · 65bcb57a
Commit 65bcb57a authored Mar 19, 2019 by vielex
Showing with 116 additions and 89 deletions
Labware/Lab12_TuningFork/TuningFork.c
--- a/Labware/Lab12_TuningFork/TuningFork.c
+++ b/Labware/Lab12_TuningFork/TuningFork.c
 // TuningFork.c Lab 12
 // Runs on LM4F120/TM4C123
 // Use SysTick interrupts to create a squarewave at 440Hz.  
 // There is a positive logic switch connected to PA3, PB3, or PE3.
 // There is an output on PA2, PB2, or PE2. The output is 
 //   connected to headphones through a 1k resistor.
 // The volume-limiting resistor can be any value from 680 to 2000 ohms
 // The tone is initially off, when the switch goes from
 // not touched to touched, the tone toggles on/off.
 //                   |---------|               |---------|     
 // Switch   ---------|         |---------------|         |------
 //
 //                    |-| |-| |-| |-| |-| |-| |-|
 // Tone     ----------| |-| |-| |-| |-| |-| |-| |---------------
 //
 // Daniel Valvano, Jonathan Valvano
 // January 15, 2016
 /* This example accompanies the book
   "Embedded Systems: Introduction to ARM Cortex M Microcontrollers",
   ISBN: 978-1469998749, Jonathan Valvano, copyright (c) 2015
 Copyright 2016 by Jonathan W. Valvano, valvano@mail.utexas.edu
    You may use, edit, run or distribute this file
    as long as the above copyright notice remains
 THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED
 OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
 VALVANO SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL,
 OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
 For more information about my classes, my research, and my books, see
 http://users.ece.utexas.edu/~valvano/
 */
 #include "TExaS.h"
 #include "..//tm4c123gh6pm.h"
 // basic functions defined at end of startup.s
 void DisableInterrupts(void); // Disable interrupts
 void EnableInterrupts(void);  // Enable interrupts
 void WaitForInterrupt(void);  // low power mode
-unsigned long flag = 0;
+unsigned long Switch = 0;
-unsigned long temp = 0;
+unsigned char switchPressedLastTime = 0;
-unsigned long lastState = 0;
+unsigned char toggle = 0;
 // input from PA3, output from PA2, SysTick interrupts
 void Sound_Init(void){ 
-  unsigned long delay;
+	unsigned long volatile delay;
-  SYSCTL_RCGC2_R |= 0x00000001; // activate port A
+	SYSCTL_RCGC2_R |= 0x01;
-  delay = SYSCTL_RCGC2_R;
+	delay = SYSCTL_RCGC2_R;
-  GPIO_PORTA_AMSEL_R &= ~0x20;      // no analog
+	GPIO_PORTA_DEN_R &= ~0x08;
-  GPIO_PORTA_PCTL_R &= ~0x000F0000; // regular function
+	GPIO_PORTA_DIR_R &= ~0x08; // MAKE PA2 A OUTPUT
-  GPIO_PORTA_DIR_R |= 0x20;     // make PA5 out
+	GPIO_PORTA_DIR_R |= 0x04; // MAKE PA3 A INPUT
-  GPIO_PORTA_DR8R_R |= 0x20;    // can drive up to 8mA out
+	GPIO_PORTA_AFSEL_R &= ~0x08; //DIASBLE ALT FUNCTION ON PA2 AND PA3
-  GPIO_PORTA_AFSEL_R &= ~0x20;  // disable alt funct on PA5
+	GPIO_PORTA_AFSEL_R &= ~0x04;
-  GPIO_PORTA_DEN_R |= 0x20;     // enable digital I/O on PA5
+	GPIO_PORTA_DEN_R |= 0x0C; // ENABLE DIGITAL I/O ON PA2 AND PA3
-  NVIC_ST_CTRL_R = 0;           // disable SysTick during setup
+	GPIO_PORTA_AMSEL_R &= ~0x08; /// DISABLE ANALOG FUNCTIONALITY OF PA
-  NVIC_ST_RELOAD_R = 39999;     // reload value for 500us (assuming 80MHz)
+	GPIO_PORTA_AMSEL_R &= ~0x04;
-  NVIC_ST_CURRENT_R = 0;        // any write to current clears it
+	GPIO_PORTA_PCTL_R &= ~0x0000FF00;
-  NVIC_SYS_PRI3_R = NVIC_SYS_PRI3_R&0x00FFFFFF; // priority 0               
+	NVIC_ST_CTRL_R = 0; // disable SysTick during setup
-  NVIC_ST_CTRL_R = 0x00000007;  // enable with core clock and interrupts
+	NVIC_ST_RELOAD_R = 90908; // reload value
-  EnableInterrupts();
+	NVIC_ST_CURRENT_R = 0; // any write to current clears it
-}
+	NVIC_SYS_PRI3_R = (NVIC_SYS_PRI3_R&0x00FFFFFF)|0x40000000;
+	NVIC_ST_CTRL_R = 0x07;
-// called at 880 Hz
+	EnableInterrupts();
-void SysTick_Handler(void){
+}
-  if(flag==1)
-		GPIO_PORTA_DATA_R ^= 0x04;
+// called at 880 Hz
-	else GPIO_PORTA_DATA_R &= ~0x04;
+void SysTick_Handler(void){
-}
+		if (toggle) {
+			GPIO_PORTA_DATA_R ^= 0x04;
-int main(void){// activate grader and set system clock to 80 MHz
+		}
-  TExaS_Init(SW_PIN_PA3, HEADPHONE_PIN_PA2,ScopeOn); 
+		else {
-  Sound_Init();         
+			GPIO_PORTA_DATA_R &= ~0x04;
-  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
+int main(void){// activate grader and set system clock to 80 MHz
-    temp = GPIO_PORTA_DATA_R & 0x08;
+	unsigned char flag = 0;
-		if(temp == 0x08 && lastState == 0x00)
-		{
+  TExaS_Init(SW_PIN_PA3, HEADPHONE_PIN_PA2,ScopeOn); 
-			flag ^= 1;
+  Sound_Init();
-		}
+	Switch = (GPIO_PORTA_DATA_R &0x08);
-		lastState = temp;
+  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
+		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 ;
+		}
+		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;
+	}
+}