51单片机用串口跟pc通信进行收发数据 51单片机与PC串口通信程序，求指导 ！ 具体要求如下：
51\u5355\u7247\u673a\u4e32\u53e3\u901a\u4fe1\u95ee\u9898\uff0c\u4e32\u53e3\u53ea\u7ed9pc\u53d1\u9001\u4e00\u6b21\u6570\u636e\u4f60\u8fd9\u91cc\u7684\u96be\u70b9\u5728\u4e8e"\u53ea\u53d1\u9001\u4e00\u6b21"\uff0c\u53ef\u4ee5\u5b9a\u4e49\u4e00\u4e2a\u6807\u5fd7\u53d8\u91cf\u521d\u59cb\u4e3a0\uff0c\u5f53P1.1=0\u65f6\u4e14\u6807\u5fd7\u4e3a0\uff0c\u5411\u4e32\u53e3\u53d1\u9001\u4e00\u4e2a\u6570\u636e\uff0c\u5e76\u7f6e\u8be5\u6807\u5fd7\u4e3a1\uff0c\u5373\u4f7fP1.1\u4f9d\u7136\u4e3a0\u4e5f\u4e0d\u4f1a\u4e00\u76f4\u53d1\u9001;\u5f53\u68c0\u6d4b\u5230P1.1=1\u65f6\uff0c\u7f6e\u6807\u5fd7\u4e3a0\uff0c\u4ee5\u4fbf\u4e0b\u6b21\u518d\u89e6\u53d1\u3002\u5176\u4ed6\u4f9d\u6b64\u7c7b\u63a8\u3002
\u8981\u6c42\u7528\u4ec0\u4e48\u8bed\u8a00\uff1f
------------------------------
\u7f51\u53cb\u201c\u661f\u5fc3\u6668\u68a6\u201d\u7684\u56de\u7b54\uff0c\u662f\u53ef\u4ee5\u6ee1\u8db3\u9898\u76ee\u8981\u6c42\u7684\u3002
\u6211\u5b9e\u9a8c\u4e86\uff0c\u662f\u6210\u529f\u7684\uff0c\u6ca1\u6709\u4efb\u4f55\u9519\u8bef\u3002
\u697c\u4e3b\u5e94\u8be5\u68c0\u67e5\u81ea\u5df1\u7684\u7535\u8def\u3001\u4e32\u53e3\u8bbe\u7f6e\u7b49\u7b49\u3002
------------------------------
\u7f51\u53cb\u201c\u661f\u5fc3\u6668\u68a6\u201d\u7684\u56de\u7b54\uff0c\u7bc7\u5e45\u7a0d\u7a0d\u957f\u4e86\u4e00\u4e9b\u3002
\u7f29\u51cf\u4e00\u534a\u5c31\u53ef\u4ee5\u6b63\u5e38\u5de5\u4f5c\u4e86\uff0c\u53ef\u8bfb\u6027\u66f4\u597d\u4e00\u4e9b\u3002
\u5efa\u8bae\u770b\u770b\u4e0b\u9762\u7684\u3002
------------------------------
#include
#include
#define uchar unsigned char
#define uint unsigned int
//---------------------------------------------------
uchar idata trdata1[] = {
'W','E','L','C','O','M','E',' ','T','O',' ','C','H','I','N','A','!',0x0d,0x0a,0x00};
uchar idata trdata2[] = {
'M','Y',' ','N','A','M','E',' ','I','S',' ','L','I','M','I','N','G',0x0d,0x0a,0x00};
uchar idata trdata3[] = {
'Y','I','N','G','Y','O','N','G','K','E','X','U','E','X','U','E','Y','U','A','N',0x0d,0x0a,0x00};
uchar RxBuf[5], Rx_p, Rx_i, TX_p, Tx_i;
//---------------------------------------------------
void UART_Init(void) //\u4e32\u53e3\u521d\u59cb\u5316
{
PCON = 0x00;
SCON = 0x50; //\u4e32\u53e3\u5de5\u4f5c\u65b9\u5f0f\u4e3a1\uff0c\u5141\u8bb8\u63a5\u6536.
TMOD = 0x20; // T1 \u5b9a\u65f6\u65b9\u5f0f2
TH1 = 0xfd; //\u6ce2\u7279\u7387 9600bps @ fosc = 11.0592MHz
TL1 = 0xfd;
TR1 = 1; //\u542f\u52a8T1
ES = 1; //\u5f00\u4e32\u53e3\u4e2d\u65ad.
EA = 1; //\u5f00\u603b\u4e2d\u65ad.
}
//---------------------------------------------------
void main()
{
UART_Init();
Rx_p = 0;
Rx_p = 2;
while(1) {
if (Rx_p != 0) {
TX_p = Rx_p;//\u5b57\u7b26\u4e321 2 3
Tx_i = 0; //\u5b57\u7b26\u6307\u9488.
Rx_p = 0; //\u6e05\u96f6.
Rx_i = 0;
TI = 1; //\u542f\u52a8\u53d1\u9001\u4e2d\u65ad.
} }
}
//---------------------------------------------------
void Uart_INT(void) interrupt 4 //\u4e32\u53e3\u4e2d\u65ad\u51fd\u6570
{
uchar Tcv = 0;
if(RI) { //\u63a5\u6536\uff1f.
RI = 0; //\u6807\u5fd7\u4f4d\u6e05\u96f6.
RxBuf[Rx_i] = SBUF;
if((RxBuf[Rx_i - 1] == 'g') && (RxBuf[Rx_i] == 'o')) Rx_p = 1;
if((RxBuf[Rx_i - 2] == 'w') && (RxBuf[Rx_i - 1] == 'h') && (RxBuf[Rx_i] == 'o')) Rx_p = 2;
if((RxBuf[Rx_i - 3] == 'h') && (RxBuf[Rx_i - 2] == 'o') && (RxBuf[Rx_i - 1] == 'm') && (RxBuf[Rx_i] == 'e')) Rx_p = 3;
P1 = Rx_p; //\u5728P1\u663e\u793a\u6536\u5230\u7684\u4fe1\u606f.
Rx_i++;
Rx_i %= 5;
}
else {
TI = 0;
if (TX_p == 1) Tcv = trdata1[Tx_i]; //\u53d6\u6765\u5f85\u53d1\u5b57\u7b26.
if (TX_p == 2) Tcv = trdata2[Tx_i];
if (TX_p == 3) Tcv = trdata3[Tx_i];
if (Tcv != 0) {SBUF = Tcv; Tx_i++;} //\u4e0d\u662f0\u5c31\u53d1\u9001.
}
}
//---------------------------------------------------
//代码来自 单片机小精灵v1.3
//波特率9600 11.0592晶振 方式2
#include <reg51.h>
void InitUART(void)
{
TMOD = 0x20;
SCON = 0x50;
TH1 = 0xFD;
TL1 = TH1;
PCON = 0x00;
EA = 1;
ES = 1;
TR1 = 1;
}
void SendOneByte(unsigned char c)
{
SBUF = c;
while(!TI);
TI = 0;
}
void main(void)
{
InitUART();
}
void UARTInterrupt(void) interrupt 4
{
if(RI)
{
RI = 0;
//add your code here!
}
else
TI = 0;
}
程序中是19200.
通讯不上有很多原因,你的电路不对、甚至是连线不对,也会导致通讯不上.
你可以试试跟踪你的程序,看看可否正确地接收到PC发过去的数据,先把接收程序调好,然后再调发送部分,这样才有目标.
楼主试试只发送一个字符，1或者2，不要12一起发送。如果硬件，连线没有问题应该是发送什么PC就接收到什么。
我提下问题，你看下是不是：
1、com口对不对
2、波特率在烧录程序的时候有的，你看下是否相同
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