11.1 PIC C -...

2004-4-7 1 of 26

PIC C

11.1 PIC C

CC

PIC C

C PC PCPC

C

CPIC

C

PIC Microchip PICC PIC C

Hitech CCS IAR Bytecraft HitechPICC PIC

Hitech PICPICC-Lite PIC

PIC16F84 PIC16F877 PIC16F628 FlashPICC-Lite

PIC C

PIC CHitech-PICC www.htsoft.comIAR www.iar.comCCS www.ccsinfo.com/picc.shtmlByteCraft www.bytecraft.com/mpccaps.html

Hitech-PICC CPIC

11.2 Hitech-PICC

PICC ANSIPIC PIC PIC

PDF created with pdfFactory Pro trial version www.pdffactory.com

http://www.htsoft.com

http://www.iar.com

http://www.ccsinfo.com/picc.shtml

http://www.bytecraft.com/mpccaps.html

http://www.pdffactory.com


2004-4-7 2 of 26

PIC PICCC

4K C<10% C

PIC

11.3 MPLAB-IDE PICC

PICC MPLAB-IDEMPLAB-IDE ICE2000 ICD2

PICCMPLAB-IDE IDE Project Set Language Tool Locations… 11-1

HI-TECH PICC Toolsuite ExecutableMPLAB-IDE

PICC Assembler C PICC Compiler PICC LinkerPICC.EXE

LocationBrowse… PICC PICC.EXE

PICC.EXEC .c .as

HI-TECH PICC3.1.3 C

C C

11-1 MPLAB-IDE




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C

11-2 CI2C

11.4 PIC C

PICC PIC C

#includepic.h

__CONFIGPICC

main

11-1 C

#include <pic.h> //

#include “pc68.h” //

//

__CONFIG (HS & PROTECT & PWRTEN & BOREN & WDTDIS);

//

void SetSFR(void);

void Clock(void);

void KeyScan(void);

void Measure(void);

void LCD_Test(void);

void LCD_Disp(unsigned char);

//

unsigned char second, minute, hour;

bit flag1,flag2;

//

11-2 C




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void main(void)

{

SetSFR();

PORTC = 0x00;

TMR1H += TMR1H_CONST;

LED1 = LED_OFF;

LCD_Test();

//

while(1) {

asm(“clrwdt”); //

Clock(); //

KeyScan(); //

Measure(); //

SetSFR(); //

}

}

11-1 C

11.5 PICC

11.5.1 PICC

PICC 11-1

bit 1 0 1

char 8 PICC char

unsigned char 8

short 16

unsigned short 16

int 16

unsigned int 16

long 32

unsigned long 32

float 24

double 24 32 PICC double 24

32

11-1 PICC

PICC Little-endian




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11.5.2 PICC

11-1 bit PICCC

unsigned int data[10];

struct commInData {

unsigned char inBuff[8];

unsigned char getPtr, putPtr;

};

union int_Byte {

unsigned char c[2];

unsigned int i;

};

11-2 C

11.5.3 PICC bank

PICC bankbank

bank0unsigned char buffer[32];

bit flag1,flag2;

float val[8];

bank0 bankbank

bank1 unsigned char buffer[32]; // bank1

bank2 bit flag1,flag2; // bank2

bank3 float val[8]; // bank3

PIC bank 128C bank RAM

bankError[000] : Can't find 0x12C words for psect rbss_1 in segment BANK1

0x12C 300 bank1 bank1bank1 bank

bankbank C bank

bankbank bank bank




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11.5.4 PICC

PICC auto bank0

PIC PICC

bank0 bank0

11.5.5 PICC

bit PICC bank 8PIC

PICC 0x000 0 0x00008

flag1 0x123

0x123/8 = 0x24

0x123%8 = 3

flag1 0x24 3 flag10x24 0x123

PIC PICCtmp

0x20tmp |= 0x80 => bsf 0x20,7

tmp &= 0xf7 => bcf 0x20,3

if (tmp&0xfe) => btfsc 0x20,0

C

C




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union {

struct {

unsigned b0: 1;

unsigned b1: 1;

unsigned b2: 1;

unsigned b3: 1;

unsigned b4: 1;

unsigned b5: 1;

unsigned : 2; //

} oneBit;

unsigned char allBits;

} myFlag;

11-3

myFlag.oneBit.b3=1; //b3 1

myFlag.allBits=0; // 0

0 0 1 1ANSI-C 0

11.5.6 PICC

PICC IEEE-754 324 PICC

24float 24 double

24 double 32

24

11.5.7 PICC

Cbank

PICC PICCPICC




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unsigned char tmpData @ 0x20; //tmpData 0x20

PICC tmpData0x20 0x20

unsigned char tmpData @ 0x20; //tmpData 0x20

bit tmpBit0 @ tmpData*8+0; //tmpBit0 tmpData 0



tmpData

11.5.8 PICC

extern

Cextern code1.c

bank1 unsigned char var1, var2; // bank1

code2.cextern bank1 unsigned char var1, var2; // bank1

volatile

PICC Cvolatile

IO

volatilevolatile unsigned char STATUS @ 0x03;

volatile bit commFlag;

volatile C

volatile

volatile




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volatile

const

const

ROM ROMconst retlw

PICC

const unsigned char name[]=”This is a demo”; //

const RAM

persistent

CPICC

mainPICC persistent

persistenpersistent unsigned char hour,minute,second; //

persistentpersistent

PIC

11.5.9 PICC

PICC C PIC

RAM

FSR PICCPICC C RAM FSR

FSR 256 bank0/1bank2/3 512 PICC




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unsigned char *ptr0; // bank0/1

bank2 unsigned char *ptr1; // bank2/3

bank3 unsigned char *ptr2; // bank2/3

bank bank0 bank1bank2 bank3

bank bank0bank

bank

unsigned char *ptr0; // bank0/1

bank2 unsigned char buff[8]; // bank2

ptr0 = buff; // bank2 bank0/1

PICCFixup overflow in expression (...)

bank

void SendMessage(unsigned char *);

bank0 bank1 bank2 bank3

void SendMessage_2(bank2 unsigned char *);

Fixup overflow

ROM

ROMconst unsigned char company[]=”Microchip”; // ROM

const unsigned char *romPtr; // ROM

romPtr company; //

data = *romPtr++; // 1

*romPtr data; //

C PICCPIC

PICC RAM




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PC

persistent volatilePICC

bankbank0/1 bank2/3

bank0bank

// bank0/1 bank0

unsigned char *ptr0;

// bank2/3 bank0

bank2 unsigned char *ptr0;

// bank2/3 bank1

bank2 unsigned char * bank1 ptr0;

bank bank

bank

volatile persistent constbank volatile persistent const

bank// bank0/1 bank0

volatile unsigned char *ptr0;

// bank2/3 bank1

bank2 unsigned char * volatile bank1 ptr0;

// ROM ROM

const unsigned char * const ptr0;

11.6 PICC

PIC C

11.6.1




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PICC CPIC 2K C

2K2K

11.6.2

PIC 87

PICC *.mapcall graph

Call graph:

*_main size 0,0 offset 0

_RightShift_C

* _Task size 0,1 offset 0

lwtoft

ftmul size 0,0 offset 0

ftunpack1

ftunpack2

ftadd size 0,0 offset 0

ftunpack1

ftunpack2

ftdenorm

11-4 C

mainC

11.6.3

PICC

void Task(void);

unsigned char Temperature(void);

void BIN2BCD(unsigned char);

void TimeDisplay(unsigned char, unsigned char);




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C

11-1

11.6.4

PICC Cvoid interrupt ISR(void);

ISRvoid interrupt

interrupt PICC0x0004

retfievoid interrupt ISR(void) //

{

if (T0IE && T0IF) // TMR0

{

T0IF = 0; // TMR0

// TMR0

}

if (TMR1IE && TMR1IF) // TMR1

{

TMR1IF = 0; // TMR1

// TMR1

}

} //

11-5 C

PICC

C

PICC




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PIC

11.6.5

PICC Cbank0

#include <math.h>#include <string.h>

PICC

C printf/sprintfprintf/sprintf

C scanf printf PICCgetch() putch() scanf/printf

getch() putch()

11.7 PICC

PICC

11.7.1

PIC PICCC

__CONFIG (HS & UNPROTECT & PWRTEN & BORDIS & WDTEN);

__CONFIGpic.h

HEX

16F7x

/* */

#define RC 0x3FFF // RC

#define HS 0x3FFE // HS




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#define XT 0x3FFD // XT

#define LP 0x3FFC // LP

/* */

#define WDTEN 0x3FFF //

#define WDTDIS 0x3FFB //

/* */

#define PWRTEN 0x3FF7 //

#define PWRTDIS 0x3FFF //

/* */

#define BOREN 0x3FFF //

#define BORDIS 0x3FBF //

/* */

#define UNPROTECT 0x3FFF //

#define PROTECT 0x3FEF //

11-6

11.7.2

PIC __IDLOC

__IDLOC (1234);

16 0x01020304

11.8 MPLAB-IDE PICC

11.3 PICC MPLAB-IDEMPLAB

MPLAB

Make MPLAB

Build All

Project Make Build All

11.8.1




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PICC Configure Select DeviceMPLAB 11-1

#include <pic.h>pic.h

MPLABpic.h

#include <pic.h>

11.8.2 PICC General

3.2.7 3-20PICC MPAMS 11-3 PICC

Include Path

11.8.3 PICC PICC Global

C 11-4

Compile for MPLAB ICD ICD CICD

Treat ‘char’ as signed PICC ‘char’

11-3 PICC 11-4 PICC




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‘char’Floating point ‘double’ width PICC‘double’ 24 float

32

11.8.4 C PICC Compiler

C C CGeneral Advanced

11-5A 11-5B

C9

20% 2K PICC

volatile

PICC

A B

11-5 C




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C

Generate assembly list file C *.lstC

C

CCompile to assembly only C

*.as CC C

11.8.5 PICC Linker

PICC Linker11-6

Generate map file

*.map

Display memory-segment usage

//Psect Usage Map: //

Psect | Contents | Memory Range

----------|------------------------------|--------------------

powerup | Power on reset code | $0000 - $0003

intentry | Interrupt service routine | $0004 - $000C

intcode | Interrupt service routine | $000D - $002C

intret | Interrupt service routine | $002D - $0035

init | Initialization code | $0036 - $003D

end_init | Initialization code | $003E - $0040

11-6 PICC




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clrtext | Memory clearing code | $0041 - $0047

const3 | Strings and constant data | $0048 - $0060

const | Strings and constant data | $0061 - $0071

const2 | Strings and constant data | $0072 - $0076

text | Program and library code | $0576 - $0582

text | Program and library code | $0583 - $07C7

float_te | Arithmetic routine code | $07C8 - $07FF

rbss_0 | Bank 0 RAM variables | $0021 - $0042

temp | Temporary RAM data | $0043 - $0047

nvram | Persistent RAM data | $0048 - $004A

intsave | Registers saved on interrupt | $004B - $004D

intsave | Registers saved on interrupt | $007F - $007F

intsave_1 | Saved copy of W in bank 1 | $00FF - $00FF

rbit_0 | Bank 0 bit variables | $0100 - $0104

config | User-programmed CONFIG bits | $2007 - $2007

Memory Usage Map: //

//

Program ROM $0000 - $0076 $0077 ( 119) words

Program ROM $0576 - $07FF $028A ( 650) words

$0301 ( 769) words total Program ROM

//bank0

Bank 0 RAM $0021 - $004D $002D ( 45) bytes

Bank 0 RAM $007F - $007F $0001 ( 1) bytes

$002E ( 46) bytes total Bank 0 RAM

//bank1

Bank 1 RAM $00FF - $00FF $0001 ( 1) bytes total Bank 1 RAM

//bank0

Bank 0 Bits $0100 - $0104 $0005 ( 5) bits total Bank 0 Bits

//

Config Data $2007 - $2007 $0001 ( 1) words total Config Data

Program statistics: //

Total ROM used 769 words (18.8%) //

Total RAM used 48 bytes (25.0%) //

11-7

11.8.6 PICC Assembler

PICC Microchip MPASMPICC

*.as MPASM *.asm




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PICC PIC C

11-7 Enable optimization ,

11.9 C

CC PIC

clrwdt sleep ;

C

11.9.1

CPICC

asm(“clrwdt”);

PICfor (;;) {

asm("clrwdt"); //

Task();

ClockRun();

asm("sleep"); //

asm("nop"); //

}

11-8

11-7 PICC




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PICC #asm#endasm 0x20~0x7F

RAM#asm

movlw 0x20

movwf _FSR

clrf _INDF

incf _FSR,f

btfss _FSR,7

goto $-3

#endasm

11-9

11.9.2 C

CC C _

C _11-9 FSR INDF

C

C _11-10

volatile unsigned char tmp; // bank0

void Test(void) //

{

#asm //

clrf _STATUS // bank0

movlw 0x10 //

movwf _tmp //tmp=0x10

#endasm //

if (tmp==0x10) { // C

;

}

}

11-10 C bank0

C PICCC

bank bank11-11




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volatile bank1 unsigned char tmpBank1; // bank1



void Test(void) //

{

#asm //

bcf _STATUS,6 // bank1

bsf _STATUS,5

movlw 0x10 //

movwf _tmpBank1^0x80 //tmpBank1=0x10

bsf _STATUS,6 // bank2

bcf _STATUS,5

movlw 0x20 //


bsf _STATUS,6 // bank3

bsf _STATUS,5

movlw 0x30 //


#endasm //

}

11-11 C bank0

Cbank

bank bank00x00 PIC bank

PICCbank bank

11.9.3 C

PICCbank0

C11-5(B) Compile to assembly only C PICC

C11-12 C

//C

void Test(unsigned char inVar1, inVar2)




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{

unsigned char tmp1, tmp2;

inVar1++;

inVar2--;

tmp1 = 1;

tmp2 = 2;

}

//

_Test

; _tmp1 assigned to ?a_Test+0 //tmp1 ?a_Test+0

_Test$tmp1 set ?a_Test

; _tmp2 assigned to ?a_Test+1 //tmp2 ?a_Test+1

_Test$tmp2 set ?a_Test+1

; _inVar1 assigned to ?a_Test+2 //inVar1 ?a_Test+2

_Test$inVar1 set ?a_Test+2

line 44

;_inVar1 stored from w // W

bcf 3,5

bcf 3,6

movwf ?a_Test+2

;ht16.c: 43: unsigned char tmp1, tmp2;

incf ?a_Test+2

line 45

;ht16.c: 45: inVar2--;

decf ?_Test // inVar2 ?_Test

line 46

;ht16.c: 46: tmp1 = 1;

clrf ?a_Test

incf ?a_Test

line 47

;ht16.c: 47: tmp2 = 2;

movlw 2

movwf ?a_Test+1

line 48

;ht16.c: 48: }

return

11-12 PICC

PICC C11-13

//C

void Test(unsigned char inVar1, inVar2)

{




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unsigned char tmp1, tmp2;

#asm //

incf ?a_Test+0,f //tmp1++;

decf ?a_Test+1,f //tmp2--;

movlw 0x10

addwf ?a_Test+2,f //inVar1 += 0x10;

rrf ?_Test,w //inVar2

rrf ?_Test,f

#endasm //

}

11-13

PICCPICC Little endian

11-14 CC

//16

unsigned int RR_Shift16(unsigned int var, unsigned char count)

{

while(count--) //

{

#asm //

rrf ?_RR_Shift16+0,w // C

rrf ?_RR_Shift16+1,f //var 1 C

rrf ?_RR_Shift16+0,f //var 1

#endasm //

}

return(var); //

}

11-14

11.9.4

C

C

C PICCC

PICCPICC




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CC

C

11-14 C PIC

countC

C

*.as

PICC CPICC Hitech

PICC

C C

CC

11-15bit EvenParity(unsigned char data)

{

#asm

swapf ?a_EvenParity+0,w // data ?a_EvenParity+0

xorwf ?a_EvenParity+0,f

rrf ?a_EvenParity+0,w

xorwf ?a_EvenParity+0,f

btfsc ?a_EvenParity+0,2

incf ?a_EvenParity+0,f

#endasm

// data

if (data&0x01) return(1);

else return(0);

}

11-15 C

C




2004-4-7 26 of 26

C




11.1 PIC C -...

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