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 <reg52.h>

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;
	}
}

来源：CSDN

作者：hello_StarLee

链接：https://blog.csdn.net/weixin_43130546/article/details/104596570

标签

串口

单片机

波特率