1. Slides created by: Professor Ian G. Harris PIC Development Environment MPLAB IDE integrates all of the tools that we will use 1.Project Manager -Groups together all files and data related to a project 2.Editor – Standard text editor to write code with 3.Assembler and Linker – Stand-alone or to group several sources/libraries 4.Debugger – Standard debugger, used with simulator or in-circuit emulator 5.Execution Engines – Instruction-level simulators for PIC devices 6.Programmer – Transfers the executable to the PIC part Cross-Compiler generates PIC machine code from a high-level language We need a C cross-compiler, will use HI-TECH C for PIC10/12/16

2. Slides created by: Professor Ian G. Harris Downloading/Installing Tools PICKit 1 comes with CDs but you should download the newest versions MPLAB IDE – Go to www.microchip.com, select MPLAB IDE link – Select MPLAB IDE v8.50 Full Release Zipped Installation link – Unzip and install – During the installation you will be prompted to download/install Hi-Tech C Compiler HI-TECH C Compiler – You may need to install this directly – Go to www.htsoft.com – Select PIC10/12/16 MCUs – Download lite mode v9.70 – Include PICC path in your path when prompted

3. Slides created by: Professor Ian G. Harris Development Example How to Make a Project 1. Write some C code using an editor, save it in a directory Try blinking-LED code on course webpage 2. Create a new project using Project > Project Wizard 3. Select device PIC16F684 4. Prompt: Select a language toolsuite, choose HI-TECH Universal Toolsuite 4. Choose a name and directory for your project 5. Prompt: Add Existing Files, add your C source file Select the C source file on the left, click Add button 6. Select Finish if everything looks OK

4. Slides created by: Professor Ian G. Harris Compiling and Programming 1. Select Project > Build to compile the project - You should see a window and eventually a “Build Successful” msg 2. Plug in the PICKit 1 3. Choose board with Select Programmer > PICKit 1 4. Program the PIC with Programmer > Program Device  The program should run after a few seconds.

5. Slides created by: Professor Ian G. Harris Simulation with MPLAB  Simulation is useful to try before hooking up real hardware  Simulation is not perfectly accurate – No understanding of analog effects  Debugger > Select Tool > MPLAB Sim to start simulator  Basic Debugger Operations (via new buttons) – Run – Pause – Animate – run slowly – Step In – step to next line – Step Over – step past a function – Step Out – complete current function – Reset – start simulation at beginning

6. Slides created by: Professor Ian G. Harris Breakpoints, Timing, Watching  Breakpoints  Set breakpoints by double-clicking on the line of code  Manage breakpoints using Debugger > Breakpoints  Stopwatch  Debugger > Stopwatch shows cycle count and time  Useful to make delays with loops  Watch Window  Watch window shows register and variable contents  Add SFR to add a register, Add Symbol to add a variable

7. Slides created by: Professor Ian G. Harris Blinking LEDs on PICKit 1 Image taken from PICkit™ 1 Flash Starter Kit User’s Guide, Microchip Technology Inc. RA1 (12) RA2 (11) RA5 (2) RA4 (3)  PIC16F684 has 12 I/O pins Port A (RA0 – RA5) and Port C (RC0 - RC5)  LEDs are connected across RA1, RA2, RA4, and RA5

8. Slides created by: Professor Ian G. Harris Blinking LED Code #include __CONFIG (FCMDIS & IESODIS & BORDIS & UNPROTECT & MCLRDIS & PWRTEN & WDTDIS & INTIO); main (){ int i; PORTA = 0; TRISA4 = 0; TRISA5 = 0; while (1 == 1) { for(i=0; i < 25000; i++); RA4 = RA4 > 1; }

9. Slides created by: Professor Ian G. Harris Blinking Light Code Components  Include required libraries  #include defines the memory mapping of all special registers  Set the Configuration Bits of the microcontroller  These bits control processor functions (clock source, watchdog, etc.  Use __CONFIG macro to set them in C  Be careful with these  Initialize I/O pins – input or output? Initialize values  Infinite while loop – Common in embedded systems  Delay loop – Needed to slow system to match human perception

10. Slides created by: Professor Ian G. Harris Controlling Digital I/O Pins  PORTA is a 6 bit bi-directional port  TRISA is the corresponding direction register  Setting a TRISA pin = 1 makes the corresponding PORTA pin an input  Clearing a TRISA pin makes the corresponding PORTA pin an output  Reading the PORTA register shows the status of the pins  Writing to PORTA writes to the pins (if they are outputs)  Can refer to individual bits in the PORTA and TRISA registers TRISA0 = 0; RA0 = 1;

11. Slides created by: Professor Ian G. Harris Length of Delay Loop for (i=0; i<25000; i++) ;  How long is this loop?  25000 clocks?  Loop needs to compare i to 25000 and to increment i.  25000 is larger than 8 bits.  Need to see the assembly code to know for sure. Clock freq = 4MHz, Period = 250 ns