2020年03月06日 | 51单片机-串口-串口发送显示

1. 视频

bilibili视频地址：

https://www.bilibili.com/video/av92932152

51单片机-串口-串口发送显示

2. 文件

文件下载链接：

https://download.csdn.net/download/weixin_43130546/12203484

3. 串口

PCON电源管理寄存器

SCON串口控制寄存器

模式&波特率（宋雪松P183）

SCON主要用模式1，的波特率

对应的，要用定时器T1&T2的模式2

TH1 = TL1 = 256 - 晶振值/12/2/16/波特率

（256是TL1的溢出值，12指12个时钟周期，16是硬件因素）

SBUF

两个SBUF寄存器，分别负责接收和发送缓冲

4. 串口配置代码

EA = 1;

void ConfigUART(unsigned long baud)

{

TH1 = 256 - (11059200 / 12 / 32) / baud;

TL1 = TH1;

SCON = 0x50;

TMOD &= 0x0F;

TMOD |= 0x20;

ET1 = 0;

ES = 1;

TF1 = 0;

TR1 = 1;

}

void InterruptUART(void) interrupt 4

{

if(RI)

{

RI = 0;

UARTNum = SBUF;

SBUF = UARTNum;

}

if(TI)

{

TI = 0;

}

}

5. 例程代码

串口助手发送0xXX，在单片机数码管上以十进制&十六进制显示

#include

sbit DULA = P2^6;

sbit WELA = P2^7;

unsigned char code DUTable[16] = 

{

0x3F,0x06,0x5B,0x4F,

0x66,0x6D,0x7D,0x07,

0x7F,0x6F,0x77,0x7C,

0x39,0x5E,0x79,0x71

};

unsigned char code WETable[8] = 

{

~0x80,~0x40,~0x20,~0x10,

~0x08,~0x04,~0x02,~0x01

};

unsigned char LedBuff[8] = 

{

0x3F,0x3F,0x3F,0X40,

0X3F,0X3F,0X08,0X3F

};

unsigned char T0RH,T0RL;

unsigned char UARTNum;

void ConfigTimer0(unsigned char ms);

void ConfigUART(unsigned long band);

void ShowNum(unsigned char num);

void main(void)

{

EA = 1;

ConfigTimer0(1);

ConfigUART(9600);

while(1)

{

ShowNum(UARTNum);

}

}

void ConfigTimer0(unsigned char ms)

{

unsigned long tmp;

tmp = 11059200 / 12;

tmp = tmp * ms / 1000;

tmp = 65536 - tmp;

tmp += 12;

T0RH = (unsigned char)(tmp>>8);

T0RL = (unsigned char)tmp;

TH0 = T0RH;

TL0 = T0RL;

TMOD &= 0xF0;

TMOD |= 0x01;

ET0 = 1;

TF0 = 0;

TR0 = 1;

}

void ConfigUART(unsigned long baud)

{

TH1 = 256 - (11059200 / 12 / 32) / baud;

TL1 = TH1;

SCON = 0x50;

TMOD &= 0x0F;

TMOD |= 0x20;

ET1 = 0;

ES = 1;

TF1 = 0;

TR1 = 1;

}

void ShowNum(unsigned char num)

{

LedBuff[0] = DUTable[num/1%10];

LedBuff[1] = DUTable[num/10%10];

LedBuff[2] = DUTable[num/100%10];

LedBuff[3] = 0x40;

LedBuff[4] = DUTable[num & 0x0F];

LedBuff[5] = DUTable[num >> 4];

LedBuff[6] = 0x08;

LedBuff[7] = 0x3F;

}

void LedScan(void)

{

static unsigned char i = 0;

P0 = 0x00;

DULA = 1;

DULA = 0;

P0 = WETable[i];

WELA = 1;

WELA = 0;

P0 = LedBuff[i];

DULA = 1;

DULA = 0;

i++;

i &= ~0xF8;

}

void InterruptTimer0(void) interrupt 1

{

TH0 = T0RH;

TL0 = T0RL;

LedScan();

}

void InterruptUART(void) interrupt 4

{

if(RI)

{

RI = 0;

UARTNum = SBUF;

SBUF = UARTNum;

}

if(TI)

{

TI = 0;

}

}