The 8051 microcontroller serial port receives characters and displays their ASCII codes (less than 100) on the digital tube.-EEWORLD

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#include <STC89C5xRC.H>

unsigned char code DIG_CODE[10] = {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f};

char buf;

void delay()//provide delay

{

int i, j;

for(i = 0; i < 15; i ++)

for(j = 0; j < 15; j ++)

;

}

void disp_digit(char d)

{

//Display the single digit

P0 = DIG_CODE[d % 10];

P2 = 0; // 0000 0000 -> (P24, P23, P22) = (0, 0, 0) -> The first digit from the right is lit

delay();

//Display ten digits

P0 = DIG_CODE[d / 10];

P2 = 1 << 2; // 0000 0100 -> (P24, P23, P22) = (0, 0, 1) -> The second digit from the right is lit

delay();

}

void UART_INT() interrupt 4 //UART中断

{

if(RI == 1)

{

RI = 0;

buf = SBUF;

}

int main()

{

TMOD = 0x21; //Set the working mode of timer1

SCON = 0x50; //Set serial communication format

TH1 = 0xE6; //Set the initial value of timer1

TL1 = 0xE6;

IE = 0x90; // Main switch closed (EA) + serial port interrupt switch closed (ES)

TR1 = 1; //Start timer1

while(1)

{

disp_digit(buf);

}

return 0;

}

Reference address：The 8051 microcontroller serial port receives characters and displays their ASCII codes (less than 100) on the digital tube.

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