PIC Overview ELG4911

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PIC Overview ELG4911

• Raymond Peterkin
• Edited by Misbah Islam

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Outline

• Introduction to PIC
• Developing code for PIC
• MPLAB IDE
• Project Creation
• Updating Source Code
• Building Projects
• Programming the PIC
• References www.microchip.com

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Introduction to PIC Peripheral Interconnect
Microcontrollers

• Basically meant to develop and run ASM programs
• More than One billion 8bit processors have been
  sold
• 8 Bit Family PIC10, PIC12, PIC14, PIC16, PIC 18
  
• lt 20 , Memory 8K-256 K, 48 MHz, 6-100 Pins
• PIC 18 Features
• 9-Ports, 80 pins, Parallel I/O, PWM, 10bit ADC,
  USART, CAN, Timers
• On chip memory 64KB,
• External Off-chip 2 MB (EMI uses 38 pins)
• 16 Bit family
• (ASM, C) PIC24, PIC32

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ASM and C

• To run C you need cross compilers
• MPLAB with Lite-C or MCC18 compilers need models
  PIC18 and over
• With commercial systems, e.g. CCS and Hi-TECH
  you can compile C programs on all models
• http//ww1.microchip.com/downloads/en/DeviceDoc/51
  025e.pdf (pp.44)
• Code Examples
• http//microchip.com/stellent/idcplg?IdcServiceSS
  _GET_PAGEnodeId1408
• http//microchip.com/stellent/idcplg?IdcServiceSS
  _GET_PAGEnodeId2623
• http//ww1.microchip.com/downloads/en/DeviceDoc/51
  519B.pdf

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Developing Code for PIC, ASM example

• MPLAB IDE
• Free integrated development environment (IDE)
  from Microchip to implement code for PICs
• Latest version 8.0 (recommended), In Lab 7.6
• IDE and documentation (user guide) can be
  downloaded from the Microchip website

• To open MPLAB IDE
• Start?All Programs?Microchip?MPLAB IDE
  v8.00?MPLAB IDE

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What are these?

• IDE Integrated Development Environment
• Software package that lets you assemble, compile,
  link, export and debug programs.
• ICE In Circuit Emulator
• Hardware that allows you to test the developed
  programs on non-real (emulated) hardware. To test
  ICE you need IDE
• Programmer
• Is a piece of hardware, e.g. PICkit 2, PM3 that
  allow the export of executable .hex files (load)
  files to the PIC processors memory directly. It
  is driven by the IDE.

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MPLAB IDE Projects

• A project must be created for implementation
• Specify your device
• Create and edit your files
• Compile and link your project
• Program the device
• To create a project
• Project?Project Wizard

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MPLAB IDE Project Creation (1/4)

• Begin project and specify device

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MPLAB IDE Project Creation (2/4)

• Step 2 Select Microchip MPASM Toolsuite
• Step 3 Create New Project File

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MPLAB IDE Project Creation (3/4)

• Step 4 Add project files
• ASM file
• Starting point for assembly code
• ltdevice namegttmpo.asm
• Linker script
• ltdevice namegt.lkr

• Example Device PIC16F917
• C\Program Files\Microchip\MPASM
  Suite\Template\Object\16f917tmpo.asm
• C\Program Files\Microchip\MPASM Suite\16f917.lkr

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MPLAB IDE Project Creation (4/4)

• Finish project creation and return to IDE
• View project details
• View?Project

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Updating Source Code

• Modify .asm files
• Under Source Files folder in project window
• Open and edit files to implement new
  functionality
• Additional files can be created and added

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Building a Project

• Project?Build All (or CtrlF10)
• Output window indicates success or failure
• HEX file generated when project is built
• Used to program the device

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Programming the PICDirectly Downloading Hex
files to the PIC Memory

• Used to transfer HEX file to the PIC and begin
  program execution
• Two methods (HEX file must be generated)
• MPLAB IDE
• Programmer?Select Programmer?PICKit2
• PICkit2
• Separate program
• Start?All Programs?Microchip?PICkit 2 v2.11

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Option a.Programming PIC with MPLAB IDE (1/3)

• Connect PIC to computer through PICkit2 Hardware
• Select the PICkit 2 from the Programmer menu
• Programmer?Select Programmer ?PICkit 2

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Programming PIC with MPLAB IDE (2/3)

• New PICkit 2 tab appears in the output window
• New options appear in the Programmer menu and
  tool bar

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Programming PIC with MPLAB IDE (3/3)

• Transfer HEX file to PIC
• Programmer?Program

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Option b. Programming PIC with PICkit 2 (1/2)

• Connect PIC to computer through PICkit2
• Start PICkit2 programmer software
• Start?Programs?Microchip?PICkit2 v 2.40
• Device is listed
• PIC is detected

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Programming PIC with PICkit 2 (2/2)

• Import HEX file
• File?Import Hex
• Transfer HEX file to PIC
• Click Write button
• Memory contents are updated with new program

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References

• Microchip website
• www.microchip.com
• Main source of information with several documents
• MPLAB IDE Users Guide (under MPLAB IDE
  description)
• Chapters 2 and 3 contain tutorials, page 44
• http//ww1.microchip.com/downloads/en/DeviceDoc/51
  025e.pdf
• Good Tutorial p 45 summary
• http//ww1.microchip.com/downloads/en/DeviceDoc/51
  519B.pdf
• PICkit 2 Microcontroller Programmer Users Guide
• PIC data sheets