UART串口通信及控制數(shù)碼管顯示的示例

ID:164629 · 發(fā)表于 2017-2-20 13:12

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#include <reg52.h>

sbit ADDR3 = P1^3;
sbit ENLED = P1^4;

unsigned char code LedChar[] = {  //數(shù)碼管顯示字符轉(zhuǎn)換表
0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8,
0x80, 0x90, 0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E
};
unsigned char LedBuff[7] = {  //數(shù)碼管+獨(dú)立LED顯示緩沖區(qū)
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
unsigned char T0RH = 0;  //T0重載值的高字節(jié)
unsigned char T0RL = 0;  //T0重載值的低字節(jié)
unsigned char RxdByte = 0;  //串口接收到的字節(jié)

void ConfigTimer0(unsigned int ms);
void ConfigUART(unsigned int baud);

void main()
{
EA = 1;    //使能總中斷
ENLED = 0; //選擇數(shù)碼管和獨(dú)立LED
ADDR3 = 1;
ConfigTimer0(1); //配置T0定時(shí)1ms
ConfigUART(9600);  //配置波特率為9600

while (1)
{ //將接收字節(jié)在數(shù)碼管上以十六進(jìn)制形式顯示出來(lái)
      LedBuff[0] = LedChar[RxdByte & 0x0F];
      LedBuff[1] = LedChar[RxdByte >> 4];
}
}
/* 配置并啟動(dòng)T0，ms-T0定時(shí)時(shí)間 */
void ConfigTimer0(unsigned int ms)
{
unsigned long tmp;  //臨時(shí)變量

tmp = 11059200 / 12;    //定時(shí)器計(jì)數(shù)頻率
tmp = (tmp * ms) / 1000;  //計(jì)算所需的計(jì)數(shù)值
tmp = 65536 - tmp;       //計(jì)算定時(shí)器重載值
tmp = tmp + 13;          //補(bǔ)償中斷響應(yīng)延時(shí)造成的誤差
T0RH = (unsigned char)(tmp>>8);  //定時(shí)器重載值拆分為高低字節(jié)
T0RL = (unsigned char)tmp;
TMOD &= 0xF0; //清零T0的控制位
TMOD |= 0x01; //配置T0為模式1
TH0 = T0RH;    //加載T0重載值
TL0 = T0RL;
ET0 = 1;       //使能T0中斷
TR0 = 1;       //啟動(dòng)T0
}
/* 串口配置函數(shù)，baud-通信波特率 */
void ConfigUART(unsigned int baud)
{
SCON  = 0x50;  //配置串口為模式1
TMOD &= 0x0F;  //清零T1的控制位
TMOD |= 0x20;  //配置T1為模式2
TH1 = 256 - (11059200/12/32)/baud;  //計(jì)算T1重載值
TL1 = TH1;    //初值等于重載值
ET1 = 0;    //禁止T1中斷
ES  = 1;    //使能串口中斷
TR1 = 1;    //啟動(dòng)T1
}
/* LED動(dòng)態(tài)掃描刷新函數(shù)，需在定時(shí)中斷中調(diào)用 */
void LedScan()
{
static unsigned char i = 0;  //動(dòng)態(tài)掃描索引

P0 = 0xFF;          //關(guān)閉所有段選位，顯示消隱
P1 = (P1 & 0xF8) | i;  //位選索引值賦值到P1口低3位
P0 = LedBuff[i];    //緩沖區(qū)中索引位置的數(shù)據(jù)送到P0口
if (i < 6)          //索引遞增循環(huán)，遍歷整個(gè)緩沖區(qū)
      i++;
else
      i = 0;
}
/* T0中斷服務(wù)函數(shù)，完成LED掃描 */
void InterruptTimer0() interrupt 1
{
TH0 = T0RH;  //重新加載重載值
TL0 = T0RL;
LedScan(); //LED掃描顯示
}
/* UART中斷服務(wù)函數(shù) */
void InterruptUART() interrupt 4
{
if (RI)  //接收到字節(jié)
{
      RI = 0;  //手動(dòng)清零接收中斷標(biāo)志位
      RxdByte = SBUF;  //接收到的數(shù)據(jù)保存到接收字節(jié)變量中
      SBUF = RxdByte;  //接收到的數(shù)據(jù)又直接發(fā)回，叫作-"echo"，
                     //用以提示用戶輸入的信息是否已正確接收
}
if (TI)  //字節(jié)發(fā)送完畢
{
      TI = 0;  //手動(dòng)清零發(fā)送中斷標(biāo)志位
}
}