Page 99 - 22-0722 EBOOK

//bring CLK=lo during Startbit
TRISA.F1 = 0; //RA1 => CLK output วารสารราชบััณฑิิตยสภา
PORTA.F1 = 0; Delay_us(50);

//Startbit = 0 ปีีที่่� ๔๖ ฉบัับัที่่� ๓ กัันยายน-ธัันวาคม ๒๕๖๔
//bring CLK=lo during Startbit
TRISA.F1 = 0; //RA1 => CLK output
PORTA.F0 = 0; Delay_us(10); //bring DAT=lo //get 8 data bits + Parity bit + Stopbit
PORTA.F1 = 0; Delay_us(50);

ศาสตราจารย์์กิิตติคุุณ ดร.มงคุล เดชนคุรินทร์ for (i=0; i < 10; i++) 89
PORTA.F1 = 0; Delay_us(50); //bring CLK=lo
//Startbit = 0

PORTA.F1 = 1; Delay_us(40); //let CLK=lo->hi { //set CLK=hi for uC 8088 to send data
//get 8 data bits + Parity bit + Stopbit
PORTA.F0 = 0; Delay_us(10); //bring DAT=lo
PORTA.F1 = 0; Delay_us(50); //bring CLK=lo PORTA.F1 = 1; Delay_us(50);
for (i=0; i < 10; i++)
//next 8 work data bits //read data bit during CLK=hi
PORTA.F1 = 1; Delay_us(40); //let CLK=lo->hi
{ //set CLK=hi for uC 8088 to send data
for (k=0; k<8; k++) dat[i] = PORTA.F0;
PORTA.F1 = 1; Delay_us(50);

{ if ((ch1 & ref)==0) { PORTA.F0 = 0; } //bring CLK=lo to end current bit read
//read data bit during CLK=hi
//next 8 work data bits
else { PORTA.F0 = 1; } PORTA.F1 = 0; Delay_us(50);
dat[i] = PORTA.F0;
for (k=0; k<8; k++)
Delay_us(10); } //bring CLK=lo to end current bit read
{ if ((ch1 & ref)==0) { PORTA.F0 = 0; }
//bring CLK=lo, let uC 8088 read bit par = dat[8]; stop = dat[9];
PORTA.F1 = 0; Delay_us(50);
else { PORTA.F0 = 1; }
PORTA.F1 = 0; Delay_us(50); }
Delay_us(10);
//set CLK=hi, prepare to change bit //Now send ACK=lo bit to uC 8088
//bring CLK=lo, let uC 8088 read bit
par = dat[8]; stop = dat[9];
PORTA.F1 = 1; Delay_us(40); TRISA.F0 = 0; //RA0 => DAT output
PORTA.F1 = 0; Delay_us(50);

ref = ref << 1; //for next higher bit //DAT=lo for ACK
//set CLK=hi, prepare to change bit
//Now send ACK=lo bit to uC 8088
} //end for PORTA.F0 = 0; Delay_us(10);
TRISA.F0 = 0; //RA0 => DAT output
PORTA.F1 = 1; Delay_us(40);
ref = ref << 1; //for next higher bit //CLK=hi for 50 us
//DAT=lo for ACK
//Parity bit = 0 (for simple demo) PORTA.F1 = 1; Delay_us(50);
PORTA.F0 = 0; Delay_us(10);
} //end for
PORTA.F0 = 0; Delay_us(10); //bring DAT=lo //CLK=lo, let uC 8088 read ACK bit

//CLK=hi for 50 us
PORTA.F1 = 0; Delay_us(50); //bring CLK=lo PORTA.F1 = 0; Delay_us(50);
PORTA.F1 = 1; Delay_us(50);
//Parity bit = 0 (for simple demo)
PORTA.F1 = 1; Delay_us(40); //let CLK=lo->hi //CLK=lo, let uC 8088 read ACK bit
PORTA.F0 = 0; Delay_us(10); //bring DAT=lo
PORTA.F1 = 0; Delay_us(50); //bring CLK=lo //release CLK & DAT lines
PORTA.F1 = 0; Delay_us(50);

PORTA.F1 = 1; Delay_us(40); //let CLK=lo->hi
//Stopbit = 1 PORTA.F1 = 1; Delay_us(20); //CLK=hi
//set RA0=hi, release DAT line PORTA.F0 = 1; //DAT=hi => Idle State
//release CLK & DAT lines

PORTA.F1 = 1; Delay_us(20); //CLK=hi
//Stopbit = 1
PORTA.F0 = 1; Delay_us(10); //calculate parity (skipped here)
//bring RA1=CLK=lo //for (i=0; i < 8; i++)
//set RA0=hi, release DAT line
PORTA.F0 = 1; //DAT=hi => Idle State
PORTA.F1 = 0; Delay_us(50); ; //{ calpar = calpar^dat[i]; } here)
PORTA.F0 = 1; Delay_us(10)
//calculate parity (skipped
//let RA1=lo->hi, release CLK line ////case of parity error
//bring RA1=CLK=lo
//for (i=0; i < 8; i++)
//{ calpar = calpar^dat[i]; }
PORTA.F1 = 0; Delay_us(50)
PORTA.F1 = 1; Delay_us(40); ; //if (calpar!=par) {QuitProg(0x07);}
////case of parity error
} //SendKdat ////case of Stopbit error
//let RA1=lo->hi, release CLK line
PORTA.F1 = 1; Delay_us(40); //if (stop==0) {QuitProg(0x0F);} );}
//if (calpar!=par) {QuitProg(0x07
} //SendKdat ////case of Stopbit error

void QuitProg(unsigned char errcode) //assemble code from dat[i], i=0, 1, ...,7
//if (stop==0) {QuitProg(0x0F);}

//get in endless loop for (i=0; i < 8; i++)

{ while(1) { showdat(errcode); } code) { if (dat[i]!=0) { cmd=cmd + bits[i]; }; }
//assemble code from dat[i], i=0, 1, ...,7
void QuitProg(unsigned char err
for (i=0; i < 8; i++)
} //QuitProg return cmd;
//get in endless loop
{ while(1) { showdat(errcode); } } //RcvHdat
{ if (dat[i]!=0) { cmd=cmd + bits[i]; }; }
} //QuitProg return cmd;
} //RcvHdat

//Page 3/3 of Fig.9

//Page 3/3 of Fig.9
void main()

{ unsigned char ch1;
void main()
unsigned int i, j, ReqFlag, tcnt=0;
{ unsigned char ch1;
unsigned int i, j, ReqFlag, tcnt=0;
//turn off comparators on RA3-RA0

CMCON = 0x07; //PORTA=digital I/O port
//turn off comparators on RA3-RA0
CMCON = 0x07; //PORTA=digital I/O port
//at start, turn 8 LEDs ON and OFF 5 times

for (j=0; j<5; j++) ShowDat(0xFF);
//at start, turn 8 LEDs ON and OFF 5 times
for (j=0; j<5; j++) ShowDat(0xFF);
// *********************************

//Send 10 bytes to uC 8088
// *********************************
INTCON = 0x00; //prevent all INTs
//Send 10 bytes to uC 8088
INTCON = 0x00; //prevent all INTs
//put 10 bytes (ASCIIs ’0’-‘9’) in buffer

for (i=0; i<10; i++)
//put 10 bytes (ASCIIs ’0’-‘9’) in buffer
{ buf[i]=(unsigned char)(48+i); } //(0x30+i)
for (i=0; i<10; i++)
{ buf[i]=(unsigned char)(48+i); } //(0x30+i)
for (j=0; j<10; j++)

{ //wait for Idle State (CLK=DAT=hi)
for (j=0; j<10; j++)
TRISA.F0 = 1; //RA0 <= DAT sense input
{ //wait for Idle State (CLK=DAT=hi)
TRISA.F1 = 1; //RA1 <= CLK sense input
TRISA.F0 = 1; //RA0 <= DAT sense input
while (PORTA.F1==0) { } //wait for CLK=hi
TRISA.F1 = 1; //RA1 <= CLK sense input
while (PORTA.F0==0) { } //wait for DAT=hi
while (PORTA.F1==0) { } //wait for CLK=hi

while (PORTA.F0==0) { } //wait for DAT=hi
//show and send data in buf[]

ShowDat(buf[j]); SendKdat(buf[j]);
//show and send data in buf[]

ShowDat(buf[j]); SendKdat(buf[j]);
//wait 2 s for 8088 to show received data

Delay_ms(2000);
//wait 2 s for 8088 to show received data
} //end for
Delay_ms(2000);
} //end for
//allow 1 sec for 8088 to settle down

//allow 1 sec for 8088 to settle down
ภาพท่� ๙ ซอฟตั์แวร์การส่ง-รับข้้อมูลแบบอนีุ้กรมข้องไมโครคอนี้โทรลเลอร์ PIC16F627A (ตั่อ)