定時(shí)器控制數(shù)碼管掃描顯示

功能：定時(shí)器控制兩位數(shù)碼管掃描顯示
器件：STC12C5A32S2兩個(gè)數(shù)碼管
************************************************************************************/
#include "config.h "

#defineuintunsigned int
#defineucharunsignedchar
#defineulongunsignedlong

int num;//顯示數(shù)據(jù)
int FrontDot = 0;//個(gè)位顯示
int BehindDot = 0;//小數(shù)顯示
uint xms = 0;//毫秒數(shù)

uint LEDDATA0[10] = {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f};
uint LEDDATA1[10] = {0xbf, 0x86, 0xdb, 0xcf, 0xe6, 0xed, 0xfd, 0x87, 0xff, 0xef};

// 延時(shí)約(0.001 * n)秒
void delay(unsigned int n)
{
int i;
ulong msNum = 923;//指令循環(huán)923次為一秒
for(i = 0; i < n; i++){
while(msNum--);
}
}

void timer0() interrupt 1
{
TH0 = 0xfc;//重要!!第一次計(jì)數(shù)滿后會(huì)從0開始計(jì)數(shù)，應(yīng)該在中斷程序中重設(shè)計(jì)數(shù)初值
TL0 = 0x65;
xms++;
if(xms == 1000){
num++;
if(num > 99)num = 0;
FrontDot = num / 10;
BehindDot = num % 10;
xms = 0;
}
}

// 定時(shí)器0初始化
void timer0_init()
{
TMOD = 0x01;//設(shè)定定時(shí)器0為工作方式1,中斷只需一次設(shè)定
TH0 = 0xfc;//設(shè)定計(jì)數(shù)初值
TL0 = 0x65;
EA = 1;//開總中斷
ET0 = 1;//開定時(shí)中斷0
TR0 = 1;//啟動(dòng)定時(shí)器0，計(jì)數(shù)滿后執(zhí)行中斷服務(wù)程序timer0()
}

//主函數(shù)
void main(void)
{
int x=0;
num = 0;
P0_0 = 0;
P0_1 = 0;
P0_2 = 0;
P0_3 = 0;
P0_4 = 0;

timer0_init();

for(;;){
if(x++ > 100)x=0;
switch(x%2)
{
delay(100);
case 0:
P0_4 = 0; // 關(guān)閉
P2 = LEDDATA0[BehindDot]; //設(shè)置數(shù)字
P0_3 = 1; // 開啟
break;
case 1:
P0_3 = 0;
P2 = LEDDATA1[FrontDot];
P0_4 = 1;
break;
}
}
}

數(shù)碼管掃描顯示先關(guān)閉不需要顯示的數(shù)碼管，再設(shè)置要顯示的數(shù)碼管的數(shù)字，最后開啟要顯示的數(shù)碼管，不然數(shù)碼管會(huì)顯示有問題

因?yàn)橄乳_啟要顯示的數(shù)碼管它會(huì)顯示上一次設(shè)置的數(shù)字，在設(shè)置數(shù)字的話，會(huì)有上次的余輝。