PIC single-chip dual-machine asynchronous communication program

PIC single chip dual machine asynchronous communication (dhd0)

1 PIC1 microcontroller programming (sending part)

#include

/*This program implements the asynchronous communication function between two MCUs. This program is the sending part*/

unsigned char tran[8]; /*define an array to store the sent data*/

unsigned char k, data; /*define general register*/

cONST char table[20]={0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0XD8, 0x80,

0x90, 0x88, 0x83, 0xc6, 0xa1, 0x86, 0x8e, 0x7f, 0xbf, 0x89, 0xff};

/*Display segment code table without decimal point*/

/*SPI display initialization subroutine*/

void SPIINIT()

{

PIR1=0;

SSPCON=0x30;

SSPSTAT=0xC0;

/*Set the SPI control mode, allow SSP mode, and send on the falling edge of the clock, and "74HC595, when

*When SCLK jumps from low to high, the characteristics of the serial input register correspond to */

TRISC=0xD7; /*SDO pin is output, SCK pin is output*/

TRISA5=0; /*RA5 pin is set as output to output display latch signal*/

}

/*Assign initial value to array subroutine*/

void fuzhi()

{

for(k=0;k<8;k ) {

tran[k]=k 3;

}

}

/*SCI component initialization subroutine*/

void sciint()

{

SPBRG=0X19; /*Set the transmission baud rate to about 9 600 bits/second*/

TXSTA=0X04; /*Select asynchronous high-speed mode to transmit 8-bit data*/

RCSTA=0X80; /*Enable synchronous serial port to work*/

TRISC6=1;

TRISC7=1; /*Set RC6 and RC7 to input mode, and present high impedance to the outside*/

}

/*SPI data transfer subroutine*/

void SPILED(data)

{

SSPBUF=data; /*Start sending*/

do {

;

}while(SSPIF==0);

SSPIF=0;

}

/*Display subroutine, display 8 digits*/

void display()

{

RA5=0; /*Ready to latch*/

for(k=0;k<8;k ) {

data=tran[k];

data=table[data]; /*get the displayed segment code*/

SPILED(data); /*Send display segment code*/

}

RA5=1; /*Finally, a latch signal is given to indicate that the task is completed*/

}

/* Main program */

main()

{

SPIINIT();

fuzhi(); /*Assign initial value to the array*/

sciint(); /*SCI component initialization*/

di(); /*interrupt disable*/

TXEN=1; /*Send enabled*/

CREN=1; /*Receive data allowed*/

for(k=0;k<8;k ){

TXREG = tran[k]; /*Send a character*/

while(1){

if(TXIF==1) break;

} /*Wait for writing to complete*/

while(1){

if(RCIF==1) break;/*If the response byte is received, the waiting is terminated*/

}

RCREG=RCREG; /*Read response byte, clear RCIF*/

}

display(); /*Display the sent data*/

while(1){

;

}

}[page]

2 PIC2 microcontroller programming (receiving part)

#include

/*This program implements the asynchronous communication function between two MCUs. This program is the receiving part and displays the received data on 8* LEDs*/

unsigned char rece[8];/*define an array to store received data*/

unsigned char k, data;/*define general register*/

const char table[20]={0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82,

0XD8, 0x80, 0x90, 0x88, 0x83, 0xc6, 0xa1, 0x86, 0x8e, 0x7f, 0xbf, 0x89, 0xff};

/*Display segment code table without decimal point*/

/*spi display initialization subroutine*/

void SPIINIT()

{

; For detailed statements, see the sending procedure

}

/*SCI component initialization subroutine*/

void sciint()

{

SPBRG = 0X19; /*Baud rate setting is the same as PIC1, about 9 600 bits/second*/

TXSTA=0X04; /*Asynchronous high-speed transmission*/

RCSTA=0X80; /*Serial port enable*/

TRISC6=1;

TRISC7=1; /*Set RC6 and RC7 to input mode, and present high impedance to the outside*/

}

/*SPI data transfer subroutine*/

void SPILED(data)

{

; For detailed statements, see the sending procedure

}

/*Display subroutine, display 4 digits*/

void display()

{

RA5=0; /*Ready to latch*/

for(k=0;k<8;k ){

data=rece[k];

data=table[data]; /*get the displayed segment code*/

SPILED(data); /*Send display segment code*/

}

RA5=1; /*Finally, a latch signal is given to indicate that the task is completed*/

}

/* Main program */

main()

{

SPIINIT(); /*spi display initialization*/

sciint(); /*SCI component initialization*/

di(); /*interrupt disable*/

CREN=1; /*Receive enabled*/

TXEN=1; /*Send enabled*/

for(k=0;k<8;k ){

while(1){

if(RCIF==1) break;

} /*Wait for receiving data*/

rece[k]=RCREG; /*Read received data and clear RCIF*/

TXREG=rece[k]; /*Send received data*/

while(1){

if(TXIF==1) break;

} /*Wait for writing to complete*/

}

display(); /*Display the received data*/

while(1){

;

}