單片機(jī)程序之三，數(shù)碼管顯示0-9自檢

這個(gè)學(xué)習(xí)板的數(shù)碼管是用P0顯示筆劃，P2選通每個(gè)字的

#include

#include

unsigned char data dis_digit;

unsigned char code dis_code[11] =

{0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90, 0xFF}; //共陽極數(shù)碼管

unsigned char data dis_buf[10];

unsigned char data dis_index;

unsigned char i = 0, j = 0;

void main(void)

{

unsigned char i;

P0 = 0xFF;

P2 = 0xFF;

TMOD = 1;

TH0 = 0xFC;

TL0 = 0x17;

IE = 0x82;

for(i=0;i<=9;i++)

{

dis_buf[i] = dis_code[i];

}

dis_digit = 0xFE;

dis_index = 0;

TR0 = 1;

while(1);

}

void timer0() interrupt 1

//定時(shí)器0中斷服務(wù)程序, 用于數(shù)碼管的動(dòng)態(tài)掃描

//dis_index--顯示索引, 用于標(biāo)識(shí)當(dāng)前顯示的數(shù)碼管和緩沖區(qū)的偏移量

//dis_gigit--位選通道, 傳送到P2口用于選通當(dāng)前數(shù)碼管的數(shù)值, 如為0xFE時(shí)選通P2.0口數(shù)碼管

//dis_buf--顯示緩沖區(qū)基地址

{

TH0 = 0xFC;

TL0 = 0x17;

P2 = 0xFF; //先關(guān)閉所有數(shù)碼管

P0 = dis_buf[dis_index];

P2 = dis_digit;

dis_digit = _crol_(dis_digit, 1); //位選通道左移, 下次中斷時(shí)選通下一位數(shù)碼管

i++;

//最簡單的延時(shí)之后換顯示內(nèi)容

if (i==100)

{

j++;

i = 0;

if (j == 5)

{

dis_index++;

if (dis_index == 10)

{

dis_index = 0;

}

i = 0;

j = 0;

}

}

//dis_index &= 0x07; //8個(gè)數(shù)碼管全部掃描完, 重新開始

}