Add Lab 13 files

DAC/DAC.c

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+// DAC.c
+// Runs on LM4F120 or TM4C123, 
+// edX lab 13 
+// Implementation of the 4-bit digital to analog converter
+// Daniel Valvano, Jonathan Valvano
+// March 13, 2014
+// Port B bits 3-0 have the 4-bit DAC
+
+#include "DAC.h"
+#include "..//tm4c123gh6pm.h"
+
+// **************DAC_Init*********************
+// Initialize 4-bit DAC 
+// Input: none
+// Output: none
+void DAC_Init(void){
+
+}
+
+
+// **************DAC_Out*********************
+// output to DAC
+// Input: 4-bit data, 0 to 15 
+// Output: none
+void DAC_Out(unsigned long data){
+
+}

DAC/DAC.h

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+// DAC.h
+// Runs on LM4F120 or TM4C123, 
+// edX lab 13 
+// Header file for the 4-bit digital to analog converter
+// Daniel Valvano, Jonathan Valvano
+// March 13, 2014
+
+// **************DAC_Init*********************
+// Initialize 4-bit DAC 
+// Input: none
+// Output: none
+void DAC_Init(void);
+
+
+// **************DAC_Out*********************
+// output to DAC
+// Input: 4-bit data, 0 to 15 
+// Output: none
+void DAC_Out(unsigned long data);
+
+
+

DAC/ExtDll.iex

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+[EXTDLL]
+Count=0

DAC/Lab13.c

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+// Lab13.c
+// Runs on LM4F120 or TM4C123
+// Use SysTick interrupts to implement a 4-key digital piano
+// edX Lab 13 
+// Daniel Valvano, Jonathan Valvano
+// March 13, 2014
+// Port B bits 3-0 have the 4-bit DAC
+// Port E bits 3-0 have 4 piano keys
+
+#include "..//tm4c123gh6pm.h"
+#include "Sound.h"
+#include "Piano.h"
+#include "TExaS.h"
+
+// basic functions defined at end of startup.s
+void DisableInterrupts(void); // Disable interrupts
+void EnableInterrupts(void);  // Enable interrupts
+void delay(unsigned long msec);
+int main(void){ // Real Lab13 
+	// for the real board grader to work 
+	// you must connect PD3 to your DAC output
+  TExaS_Init(SW_PIN_PE3210, DAC_PIN_PB3210,ScopeOn); // activate grader and set system clock to 80 MHz
+// PortE used for piano keys, PortB used for DAC        
+  Sound_Init(); // initialize SysTick timer and DAC
+  Piano_Init();
+  EnableInterrupts();  // enable after all initialization are done
+  while(1){                
+// input from keys to select tone
+
+  }
+
+}
+
+// Inputs: Number of msec to delay
+// Outputs: None
+void delay(unsigned long msec){ 
+  unsigned long count;
+  while(msec > 0 ) {  // repeat while there are still delay
+    count = 16000;    // about 1ms
+    while (count > 0) { 
+      count--;
+    } // This while loop takes approximately 3 cycles
+    msec--;
+  }
+}
+
+

DAC/Piano.c

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+// Piano.c
+// Runs on LM4F120 or TM4C123, 
+// edX lab 13 
+// There are four keys in the piano
+// Daniel Valvano
+// September 30, 2013
+
+// Port E bits 3-0 have 4 piano keys
+
+#include "Piano.h"
+#include "..//tm4c123gh6pm.h"
+
+
+// **************Piano_Init*********************
+// Initialize piano key inputs
+// Input: none
+// Output: none
+void Piano_Init(void){ 
+
+}
+// **************Piano_In*********************
+// Input from piano key inputs
+// Input: none 
+// Output: 0 to 15 depending on keys
+// 0x01 is key 0 pressed, 0x02 is key 1 pressed,
+// 0x04 is key 2 pressed, 0x08 is key 3 pressed
+unsigned long Piano_In(void){
+
+  return 0; // remove this, replace with input
+}

DAC/Piano.h

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+// Piano.h
+// Runs on LM4F120 or TM4C123, 
+// edX lab 13 
+// There are four keys in the piano
+// Daniel Valvano, Jonathan Valvano
+// March 13, 2014
+
+// **************Piano_Init*********************
+// Initialize piano key inputs
+// Input: none
+// Output: none
+void Piano_Init(void); 
+
+
+// **************Piano_In*********************
+// Input from piano key inputs
+// Input: none 
+// Output: 0 to 15 depending on keys
+// 0x01 is key 0 pressed, 0x02 is key 1 pressed,
+// 0x04 is key 2 pressed, 0x08 is key 3 pressed
+unsigned long Piano_In(void);

DAC/Sound.c

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+// Sound.c
+// Runs on LM4F120 or TM4C123, 
+// edX lab 13 
+// Use the SysTick timer to request interrupts at a particular period.
+// Daniel Valvano, Jonathan Valvano
+// March 13, 2014
+// This routine calls the 4-bit DAC
+
+#include "Sound.h"
+#include "DAC.h"
+#include "..//tm4c123gh6pm.h"
+
+// **************Sound_Init*********************
+// Initialize Systick periodic interrupts
+// Also calls DAC_Init() to initialize DAC
+// Input: none
+// Output: none
+void Sound_Init(void){
+
+}
+
+// **************Sound_Tone*********************
+// Change Systick periodic interrupts to start sound output
+// Input: interrupt period
+//           Units of period are 12.5ns
+//           Maximum is 2^24-1
+//           Minimum is determined by length of ISR
+// Output: none
+void Sound_Tone(unsigned long period){
+// this routine sets the RELOAD and starts SysTick
+}
+
+
+// **************Sound_Off*********************
+// stop outputing to DAC
+// Output: none
+void Sound_Off(void){
+ // this routine stops the sound output
+}
+
+
+// Interrupt service routine
+// Executed every 12.5ns*(period)
+void SysTick_Handler(void){
+
+}

DAC/Sound.h

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+// Sound.h
+// Runs on LM4F120 or TM4C123, 
+// edX lab 13 
+// Use the SysTick timer to request interrupts at a particular period.
+// Daniel Valvano, Jonathan Valvano
+// March 13, 2014
+
+// **************Sound_Init*********************
+// Initialize Systick periodic interrupts
+// Also initializes DAC
+// Input: none
+// Output: none
+void Sound_Init(void);
+
+// **************Sound_Tone*********************
+// Change SysTick periodic interrupts to start sound output
+// Input: interrupt period
+//           Units of period are 12.5ns
+//           Maximum is 2^24-1
+//           Minimum is determined by length of ISR
+// Output: none
+void Sound_Tone(unsigned long period);
+
+
+// **************Sound_Off*********************
+// stop outputing to DAC
+// Output: none
+void Sound_Off(void);
+

DAC/TExaS.h

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+// TExaS.h
+// Runs on LM4F120/TM4C123
+// Periodic timer Timer4A, ADC1, PD3, and UART0 used to create the scope
+// Periodic timer Timer5A which will interact with debugger and grade the lab 
+// It initializes on reset and runs whenever interrupts are enabled
+// Jonathan Valvano
+// March 4, 2014
+
+/* This example accompanies the book
+   "Embedded Systems: Real Time Operating Systems for ARM Cortex M Microcontrollers",
+   ISBN: 978-1466468863, Jonathan Valvano, copyright (c) 2013
+   Section 6.4.5, Program 6.1
+
+ Copyright 2013 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/
+ */
+
+// IMPORTANT: These enumerated types are specific to Lab 13.
+enum InputPorts{
+  SW_PIN_PA5432 = 0,
+  SW_PIN_PB3210 = 1,
+  SW_PIN_PE3210 = 4
+};
+
+enum OutputPorts{
+  DAC_PIN_PA5432 = 0, // optionally, you can use PA7-2, but the top two bits are not graded
+  DAC_PIN_PB3210 = 1, // optionally, you can use PB5-0, but the top two bits are not graded
+  DAC_PIN_PE3210 = 4  // optionally, you can use PE5-0, but the top two bits are not graded
+};
+
+enum ScopeModes{
+  ScopeOff = 0,   // no scope needed
+  ScopeOn = 1     // turn on UART0 and stream analog data from PD3 to TExaSdisplay
+};
+// ************TExaS_Init*****************
+// Initialize grader, triggered by timer 5A
+// This needs to be called once 
+// Inputs: iport input(s) connected to this port
+//         oport output(s) connected to this port
+//         scope true if oscilloscope to be implemented (uses UART0 and TExaSdisplay)
+// Outputs: none
+void TExaS_Init(enum InputPorts iport, enum OutputPorts oport, enum ScopeModes scope);
+
+// ************TExaS_Stop*****************
+// Stop the transfer 
+// Inputs:  none
+// Outputs: none
+void TExaS_Stop(void);