2004-4-7 1 of 26

PIC C 11.1 PIC C

C

C PIC C

C PC PC

PC

C

C PIC C

PICMicrochip PIC

C PIC C HitechCCSIARBytecraft HitechPICC PIC

Hitech PIC PICC-Lite PIC PIC16F84PIC16F877 PIC16F628 Flash PICC-Lite PIC C

PIC C Hitech-PICC www.htsoft.com IAR www.iar.com CCS www.ccsinfo.com/picc.shtml ByteCraft www.bytecraft.com/mpccaps.html Hitech-PICC C

PIC 11.2 Hitech-PICC

PICC ANSI

PIC PIC PIC

2004-4-7 2 of 26

PICPICC C 4KC

2004-4-7 3 of 26

C

11-2 CI2C

11.4 PIC C

PICC PIC C

#includepic.h

__CONFIG PICC

main

11-1 C

#include //

#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

2004-4-7 4 of 26

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

2004-4-7 5 of 26

11.5.2 PICC 11-1 bitPICC

C 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 bank

bank bank0

unsigned char buffer[32];

bit flag1,flag2;

float val[8];

bank0 bank

bank bank1 unsigned char buffer[32]; // bank1

bank2 bit flag1,flag2; // bank2

bank3 float val[8]; // bank3

PIC bank 128

C bank RAM bank

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

0x12C300 bank1 bank1 bank1 bank

bank

bankC bank bank bank bank bank

2004-4-7 6 of 26

11.5.4 PICC PICC auto bank0

PICPICC

bank0 bank0

11.5.5 PICC

bit PICC bank 8

PIC

PICC0x000 0 0x0000

8

flag1 0x123

0x123/8 = 0x24

0x123%8 = 3

flag1 0x24 3 flag1 0x24 0x123

PIC PICC tmp 0x20

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

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

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

C

C

2004-4-7 7 of 26

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 1 ANSI-C 0

11.5.6 PICC

PICC IEEE-754 32 4PICC 24 float 24 double 24 double 32

24

11.5.7 PICC C

bank

PICC PICC PICC

2004-4-7 8 of 26

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

PICC tmpData

0x20 0x20

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

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

bit tmpBit1 @ tmpData*8+1; //tmpBit0 tmpData 1

bit tmpBit2 @ tmpData*8+2; //tmpBit0 tmpData 2

tmpData

11.5.8 PICC

extern C

extern code1.c bank1 unsigned char var1, var2; // bank1

code2.c extern bank1 unsigned char var1, var2; // bank1

volatile

PICC C

volatile IO

volatile volatile unsigned char STATUS @ 0x03;

volatile bit commFlag;

volatile C

volatile

volatile

2004-4-7 9 of 26

volatile

const const

ROM ROM constretlw PICC

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

const RAM

persistent C

PICC mainPICC persistent

persisten persistent unsigned char hour,minute,second; //

persistent

persistent PIC

11.5.9 PICC PICC C PIC

RAM FSRPICC

PICC C RAM FSRFSR 256 bank0/1 bank2/3 512PICC

2004-4-7 10 of 26

unsigned char *ptr0; // bank0/1

bank2 unsigned char *ptr1; // bank2/3

bank3 unsigned char *ptr2; // bank2/3

bank bank0 bank1 bank2 bank3 bank bank0 bank bank

unsigned char *ptr0; // bank0/1

bank2 unsigned char buff[8]; // bank2

ptr0 = buff; // bank2 bank0/1

PICC Fixup overflow in expression (...)

bank

void SendMessage(unsigned char *);

bank0 bank1 bank2 bank3

void SendMessage_2(bank2 unsigned char *);

Fixup overflow

ROM ROM

const unsigned char company[]=Microchip; // ROM

const unsigned char *romPtr; // ROM

romPtr company; //

data = *romPtr++; // 1

*romPtr data; //

CPICC

PIC PICC RAM

2004-4-7 11 of 26

PC

persistentvolatile PICC

bank bank0/1 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 volatilepersistent const bank volatilepersistent 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

2004-4-7 12 of 26

PICC C PIC 2K C 2K 2K

11.6.2

PIC 8

7

PICC *.map

call 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

main C

11.6.3 PICC

void Task(void);

unsigned char Temperature(void);

void BIN2BCD(unsigned char);

void TimeDisplay(unsigned char, unsigned char);

2004-4-7 13 of 26

C

11-1 11.6.4 PICC C

void interrupt ISR(void);

ISRvoidinterrupt

interruptPICC

0x0004retfie

void 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

2004-4-7 14 of 26

PIC

11.6.5 PICC C

bank0 #include

#include PICC

C printf/sprintf

printf/sprintf

CscanfprintfPICC

getch() putch() scanf/printf getch() putch()

11.7 PICC PICC 11.7.1 PIC PICC

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

__CONFIG

pic.h

HEX 16F7x

/**/

#define RC 0x3FFF // RC

#define HS 0x3FFE // HS

2004-4-7 15 of 26

#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);

160x 01020304 11.8 MPLAB-IDE PICC

11.3 PICCMPLAB-IDE

MPLABMPLAB

MakeMPLAB

Build All

ProjectMakeBuild All

11.8.1

2004-4-7 16 of 26

PICC Configure Select Device

MPLAB 11-1 #include pic.hMPLAB pic.h

#include 11.8.2 PICCGeneral 3.2.7 3-20

PICCMPAMS 11-3 PICC

Include Path

11.8.3 PICCPICC Global C 11-4

Compile for MPLAB ICD ICD C ICD

Treat char as signedPICCchar

11-3 PICC

11-4 PICC

2004-4-7 17 of 26

char Floating point double widthPICC

double 24 float 32

11.8.4 CPICC Compiler

C C C

GeneralAdvanced 11-5A 11-5B

C

9

20%2K PICC

volatile

PICC

A B

11-5 C

2004-4-7 18 of 26

C

Generate assembly list file C*.lst C C

C Compile to assembly only C *.as C C C

11.8.5 PICC Linker PICC Linker

11-6

Generate map file

*.map

Display memory-segment usage

// Psect Usage Map: //

Psect | Contents | Memory Range

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