ccs pic 'c' compiler tutorial

IN THE NAME OF ALLAH, THE MOST GRACIOUS, THE MOST MERCIFUL

CCS PIC “C” COMPILER TUTORIAL

ADEEL ANWAR69th E.C

Created on : 2nd MAY 2010

COLLEGE OF AERONAUTICAL ENGEENERING CAE

(adeelanwr@gmail.com)

• I am making this tutorial with the motivation that, it will be helpful for the fellow students and it’s a small contribution toward students society.

• I hope and expect that the students coming afterwards will contribute further and we will improve collectively by helping each other.

CONTENTS

• Basic Tutorial• Pic wizard• Pic Device Selector• Fuses and Interrupts list• Serial Port Moniter

Note: “Basic Tutorial” (for Beginners) is sufficient for creating and compiling the complete project. Next topics (Pic wizard & onwards) describe the extra utilities provided by the compiler that make some tasks easier.

Basic Tutorial

• Creating new Project • Adding Source file • Writing and editing source file• Compilation• RAM/ROM percentage • View generated assembly code (optional) • Generated files

WE WANT TO CREATE A NEW

PROJECT

ADD SOURCE FILE TO THE

PROJECT

WRITE NAME OF SOURCE FILE

BLANK SOURCE FILE“prg2.c”

START WRITING CODE

HEADER FILES SPECIFING “CHIP NO” ,

“CRYSTAL FREQUENCY” & “SERIAL PORT PARAMETERS”

RESPECTIVELY MAIN LOOP

INFINITE LOOP TO MAKE u-CONTROLLER WORK FROM POWER

ON TILL OFF

OBSERVE THESE “-” SIGNS WITH “main” “while” AND “for”

THERE IS ALSO AN ENDING SYMBOL

GENERALLY THESE SYMBOLS ARE ATTACHED TO ALL THE “LOOPS” , “IF

ELSE ” OR ANYSTATEMENTS INSIDE “{ }”

CLICK ON “-” SIGN

SIGN CHANGES TO “+” AND ALL THE STATEMENTS

INSIDE “for” LOOP ARE MINIMIZED

USE OF THESE SMALL TIPS MAKES THE CODE MORE READABLE AND EASIER TO DEBUG

WE HAVE WRITTEN THE CODE NOW WE

WANT TO COMPILE IT

CLICK (1)

CLICK (2)

COMPILATION IN PROGRESS

“RAM” AND “ROM” PERCENTAGE INDICATE HOW MUCH RAM OR ROM OF MICROCONTROLLER, THE WRITTEN CODE WILL USE

Note:. This feature helps programmer to optimize code and use of u-controller resources. As this is a small program and it is not consuming much Ram/Rom of “16F628A” so, 16F628A should not be used for this particular program during mass

manufacturing as device is under utilized (costly)

AFTER COMPILATION IS COMPLETE ERRORS OR WARNINGS WILL

APPEAR HERE. IF ANY ERROR THEN PROGRAM NEEDS TO BE

CORRECTED BUT WARNING MAY BE NEGLECTED

IF USER WANT TO SEE THE ASSEMBLY CODE GENERATED BY WRITTEN “C”

THE “C” STATEMENT “output_D(0)” IS

CONVERTED TO FOUR ASSEMBLY STATEMENTS

A SMALL “C” PROGRAM IS CONVERTED TO “216” ASSEMBLY STATEMENTS (ALTHOUGH THERE ARE SOME COMMENTS LINES). DUE TO THIS REASON

NOWADAYS u-CONTROLLER ARE MOSTLY PROGRAMMED IN “C” NOT ASSEMBLY

SOURCE FILE

COF FILE

HEX FILE

HEADER FILE (2ND C FILE AMONG ALL

FILES)

PIC WIZARD

INTRODUCTION

• Pic wizard is a useful tool that helps the user for initializing peripherals and writing code for PIC u-Controller.

• Different peripherals options/settings are presented in form of Graphical User Interface (GUI).

• It creates the basic layout of the code that include different interrupt service routines, initialization parameters for timers, interrupts and other device peripherals etc.

CLICK (1)

CLICK (2)

WRITE NAME OF SOURCE FILE

WIZARD WINDOW

FEATURES WINDOW

FEATURES OPTIONS WINDOW

GENERAL (1)

SELECT DEVICE NOTE: ALL FURTHER

FEATURE SELECTION OPTIONS WILL BE

BASED ON SELECTED DEVICE

OSCILLATOR

OTHER START-UP

/PROGRAMMING OPTIONS

CLICK (1)USER WANTS TO USE RS-

SELECT RS-232 OPTIONS

CLICK (1)

TIMER 1 DISABLED

TIMER 0 WITH .2 us Resol. AND 51.2 us OVERFLOW TIME

TIMER 2 DISABLED

TIMER 1 ENABLED

TIMER 1 SETTINGS

NOTE: RESOLUTION EFFECTS OVERFLOW

TIME (COMPARE PREVIOUS)

EACH TIMER SETTINGS GENERATES A CODE THAT

WILL BE ADDED TO SOURCE FILE AT THE END OF WIZARD

CLICK (1)

SELECT A/D CONVERTERS

CURRENTLY 8-BIT (0-255) MODE IS

SELECTED

CLICK (1)

SELECT INTERRUPTS

CLICK (1)

AS WE HAVE SELECTED EXTERNAL INTERRUPT (PREVIOUS PAGE). THIS

CODE WILL BE ADDED TO SOURCE FILE.

IF THERE ARE NO MORE FEATURES THAT USER WANT TO USE CLICK

“OK”

INITILIZATION CODE GENERATED BY WIZARD TO

SET REQUIRED PARAMETERS OF TIMER/INTERRUPT & A/D

CONVERTER etc.

WRITE EXTERNAL INTERRUPT

SERVICE ROUTINE

START WRITING CODE HERE

(MAIN LOOP etc.)

THERE IS AN INCLUDE FILE (HEADER FILE) AT

THE BEGINNING OF EACH SOURCE FILE

CREATED BY WIZARD

HEADER FILE HAS INFORMATION ABOUT THE SELECTED DEVICE,CLOCK,RS-232 PINS, A/D CONVERTERS

& FUSES etc…

CLICK (1)

CLICK (2)

GENERALLY THE SECOND “C FILE” IN THE LIST IS HEADER

FILE (CLICK)

“prog1.h” IS HEADER FILE.

NOTE: THIS FILE IS CREATED SEPERATELY SO THAT

READABILITY OF THE “source file” IS IMPROVED

CCS PICC DEVICE SELECTOR

INTRODUCTION

• A large PIC family provides user, the flexibility to select the chip which fulfill the requirement optimally.

• The devices which have large features are more costly. So, from Economical point of view, select the device which only has those features that the design requires.

• Device Selection Tool is helpful in selecting the appropriate chip which meets the design requirement.

CLICK (1)

CLICK (2)

“SELECTED” SHOWS THE CHIPS WHICH

FULFILL THE CRITERIA

“CRITERIA” CONSISTS OF THE MINIUM

FEATURES THE CHIP SHOULD HAVE

SPECIFY THE PIC FAMILY THE SELECTED CHIP SHOULD BELONG.

IF WE REQUIRE USB PORT SO, WE

CHANGE “Don’t Care” TO “Yes”

SELECTED DEVICES ALL HAVE USB PORT AND THEY BELONG

TO PIC 14-16 BIT FAMILYCOLLEGE OF AERONAUTICAL ENGEENERING CAE

Min. 256 Byte RAM AND 8 KB ROM (8192 Bytes) IS

REQUIRED

ANOTHER REQUIREMENT IS

OF 8-12 A/D CONVERTERS

ALL THESE CHIPS SHOWN FULFILL THE CRITERIA.

FEATURES OF DEVICES SHOWN IN “SELECTED” LIST ARE LIMITED. IF

WE WANT SEE ALL THE FEATURES OF A PARTICULAR CHIP e.g. 16F877

CLICK (1)

ALL FEATURES OF 16F877

16F877 HAVE TIMER 1 & 2 ONLY . ALL PIC CHIPS HAVE TIMER 0

(thus not shown )

FUSES AND INTERRUPTS LIST

• This tool of the compiler can be used to see the fuses and interrupts that can be used for a specific device.

• Thus, it provides a quick glance, at the fuses and interrupts options available for a particular Pic device, instead of tedious search in the device data sheet

CLICK (1)

CLICK (2)

SELECT DEVICE (e.g. 16F877)

ALL THESE FUSES CAN BE USED FOR SELECTED DEVICE

(16F877)

NOTE: FOR FUSES DETAIL REFER TO BOOK “PROGRAMMING 8 BIT PIC u-

CONTROLLER ” M. P Bates (PAGE 11)

CLICK (1)

SELECT DEVICE

ALL THE INTERRUPTS THAT CAN BE USED FOR SELECTED DEVICE

SERIL PORT MONITER

This tool works same as hyper terminal but in new windows (vista and later) there is no hyper terminal so this tool can be used to send/receive data to/from the computer serial port.

CLICK (1)

CLICK (2)

SELECT COM PORT

BAUD RATE

TYPE DATA TO SEND TO SERIAL PORT

RECEIVED DATA APPEAR HERE

Don't blame the unfavorable circumstances that stops you from doing what needs to be done as "the key lies in our decision not our condition"

(Everyday Greatness)

ccs pic 'c' compiler tutorial

source file writing

written code

topics pic wizard

pic ucontroller

disabled timer

device peripherals

device note

enabled timer

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