用C语言中断方式实现串口的读写

＃include <stdio.h>

＃include <dos.h>

＃include <time.h>

#define LSB 0

#define MSB 1

#define RXR 0

#define TXR 0

#define IER 1

#define IIR 2

#define LCR 3

#define MCR 4

#define LSR 5

#define MSR 6

#define Com1_base 0x3f8

#define uchar unsigned char

volatile uchar inputData;

volatile uchar onInput = 0x00;

volatile uchar onOutput = 0x00;

volatile uchar inputdata[256]; /*设设置接收缓冲区大小*/

volatile unsigned int count; /*中断接收的数据数目*/

int datacount;/*当前已发送数据条数*/

void interrupt (*OldVect)(); /*函数是用来获取中断处理程序的入口地址的*/

void interrupt SerialISR();

void InitCom()

{

uchar inttemp;

/*设置波特率什么的*/

outportb(Com1_base+LCR,0x80); /*使LCR的高位为1，以便读取其它寄存器*/

outportb(Com1_base+LSB,0x0c); /*除数锁存器（低8位）DLL*/

outportb(Com1_base+MSB,0x00); /*除数锁存器（高8位）DLH 产生2400波特率*/

outportb(Com1_base+LCR,0x03); /*8位数据，1位停止位，无校验*/

outportb(Com1_base+IER,0x01); /*接收采用中断方式*/

/*设置中断向量*/

OldVect = getvect(0x0c); /*函数是用来获取中断处理程序的入口地址的*/

disable();

inttemp = inportb(0x21)&0xef;

outportb(0x21,inttemp);

setvect(0x0c,SerialISR); /*设置SerialISR的中断入口地址为0X0C*/

enable();

}

void CloseCom()

{

disable();

outportb(Com1_base+IER,0x00); *禁止中断*/

outportb(Com1_base,0x00);

outportb(0x21,inportb(0x21)|~(0xef));

setvect(0x0c,OldVect);

}

void interrupt SerialISR()

{

/*串口中断服务代码*/

inputData = inportb(Com1_base+RXR);

onInput = 0x01;

inputdata[count]=inputData;

count++;

/*服务代码结束*/

outportb(0x20,0x20); /*中断结束的代码*/

}

void SendChar(uchar key)

{

while( ((inportb(Com1_base + LSR)) & 0x40) == 0);

outportb(Com1_base + TXR,key);

}

/*...........延时函数......................*/

void delay(unsigned int n)

{

unsigned int i,k;

for(k=0;k<n;k++)

{

for(i=1;i<1142;i++)

;

}

}

/*........CDMA命令发送函数.................*/

void CDMA_CommandSend(char *p,unsigned int n)

{

int i,k,m,l;

int flag=0;

int selse_flag=0; int selse_flag_1=0;

int selse_flag1=0;int selse_flag1_1=0;

time_t start,end;

double dif=0;

char a;

uchar bExit_flag = 0x00;

count=0;

while(!bExit_flag)

{

count=0;

for(i=0;i<n;i++)

{SendChar(*p);delay(9000);p++;}

/*..........等待2S..................*/

time (&start);

dif=0;

while(dif<2)

{

delay(9000);

time (&end);

dif = difftime (end,start);

}

if(count>14)

{

time (&start);

dif=0;

while(dif<3)

{

delay(9000);

time (&end);

dif = difftime (end,start);

}

}

/*..........判断发送命令是否成功..................*/

for(m=0;m<count;m++)

{

if(count>10)

{

for(l=0;l<count;l++)

{

if(inputdata[l-1]=='N'&&inputdata[l-2]=='E'&&inputdata[l-3]=='P'&&inputdata[l-4]=='O'&&inputdata[l-5]=='P'&&inputdata[l-6]=='P'&&inputdata[l-7]=='P'&&inputdata[l-8]=='V') { selse_flag_1=1;}

if(inputdata[l-1]=='N'&&inputdata[l-2]=='E'&&inputdata[l-3]=='P'&&inputdata[l-4]=='O'&&inputdata[l-5]=='P'&&inputdata[l-6]=='C'&&inputdata[l-7]=='T'&&inputdata[l-8]=='V') { selse_flag1_1=1;}

}

if(selse_flag_1==1){if(inputdata[m-1]=='3'&&inputdata[m-2]=='3'&&inputdata[m-3]==':'&&inputdata[m-4]=='T') selse_flag=1;}

if(selse_flag1_1==1){if(inputdata[m-1]=='0'&&inputdata[m-2]==','&&inputdata[m-3]=='1'&&inputdata[m-4]==':'&&inputdata[m-5]=='N') selse_flag1=1;}

if(selse_flag_1==1||selse_flag1_1==1)

{

if(selse_flag==1) {if(inputdata[m-1]=='0'&&inputdata[m-2]==':'&&inputdata[m-3]=='N'&&inputdata[m-4]=='E') flag=1;}

if(selse_flag1==1) {if(inputdata[m-1]=='0'&&inputdata[m-2]==','&&inputdata[m-3]=='1'&&inputdata[m-4]==':'&&inputdata[m-5]=='S') flag=1;}

}

else {if(inputdata[m-1]=='O'&&inputdata[m]=='K') {flag=1; }}

}

else {if(inputdata[m-1]=='O'&&inputdata[m]=='K') flag=1; }

}

if(flag==1){bExit_flag = 0x01;}

else {p=p-n; }

for(i=0;i<count;i++) printf("%c",inputdata[i]);

/*........按空格停止测试.............................*/

if(kbhit()){a=getch(); if(a==' '){CloseCom(); exit(1);}}

}

}

/*........数据测试发送任务.....................*/

void Data_Send(char *pcomd,int n,char *pdata,int m)

{

int i,k,l;time_t start,end;

double dif=0;

count=0;

for(i=0;i<n;i++)

{

SendChar(*pcomd);delay(9000);pcomd++;

}

time (&start);

dif=0;

while(dif<0.2)

{

delay(9000);

time (&end);

dif = difftime (end,start);

}

for(l=0;l<m;l++)

{

SendChar(*pdata);pdata++;

}

printf("The data num:%d",datacount);

datacount++;

}

void main()

{int i;char a;

/*........模块测试命令..................................*/

uchar CDMA_COMMAND_1[]={"at\r"};

uchar CDMA_COMMAND_2[]={"atz\r"};

uchar CDMA_COMMAND_3[]={"ate1v1\r"};

uchar CDMA_COMMAND_4[]={"AT+CRM=1;+CPS=33;+CMUX=1;+CTA=0\r"};

uchar CDMA_COMMAND_5[]={"AT+VPPPOPEN\r"};

uchar CDMA_COMMAND_6[]={"AT+VTCPOPEN=1,\"60.63.42.129\",1234\r"};

uchar CDMA_COMMAND_7[]={"AT+VTCPSEND=1,20\r"};

uchar CDMA_DATA[]={"ABCDEFGHIJKLMNOPQRST"};

uchar CDMA_COMMAND_9[]={"AT+VPPPCLOSE\r"};

uchar CDMA_COMMAND_8[]={"AT+VTCPCLOSE=1\r"};

uchar bExit_flag1 = 0x00;

time_t start,end;

double dif=0;

InitCom();/*初始化端口1*/

inputData = inportb(Com1_base+RXR);

while(!bExit_flag1)

{

/*.................................................................*/

if(kbhit()) /*按任意键开始测试CDMA*/

{

/*.............................................................. ...*/

/*.........发送TCP断开命令.....................................*/

CDMA_CommandSend(CDMA_COMMAND_8,strlen(CDMA_COMMAND_8));

/*.........发送PPP断开命令......................................*/

CDMA_CommandSend(CDMA_COMMAND_9,strlen(CDMA_COMMAND_9));

/*.........发送AT命令..........................................*/

CDMA_CommandSend(CDMA_COMMAND_1,strlen(CDMA_COMMAND_1));

/*.........发送ATZ命令.........................................*/

CDMA_CommandSend(CDMA_COMMAND_2,strlen(CDMA_COMMAND_2));

/*.........发送ATE1V1命令......................................*/

CDMA_CommandSend(CDMA_COMMAND_3,strlen(CDMA_COMMAND_3));

/*.........发送AT初始化命令....................................*/

CDMA_CommandSend(CDMA_COMMAND_4,strlen(CDMA_COMMAND_4));

/*.........发送PPP拔号命令.....................................*/

CDMA_CommandSend(CDMA_COMMAND_5,strlen(CDMA_COMMAND_5));

/*.........发送网络连接命令....................................*/

CDMA_CommandSend(CDMA_COMMAND_6,strlen(CDMA_COMMAND_6));

/*.........发送数据............................................*/

datacount=0;

while(1)

{

Data_Send(CDMA_COMMAND_7,strlen(CDMA_COMMAND_7),CDMA_DATA,strlen(CDMA_DATA));

time (&start);

dif=0;

while(dif<0.2)

{

delay(9000);

time (&end);

dif = difftime (end,start);

}

if(kbhit()){a=getch(); if(a==' '){bExit_flag1 = 0x01; break;}}

}

/*.........发送TCP断开命令.....................................*/

for(i=0;i<3;i++)

CDMA_CommandSend(CDMA_COMMAND_8,strlen(CDMA_COMMAND_8));

/*.........发送PPP断开命令......................................*/

for(i=0;i<3;i++)

CDMA_CommandSend(CDMA_COMMAND_9,strlen(CDMA_COMMAND_9));

bExit_flag1 = 0x01;

}

/*.................................................................*/

}

CloseCom(); /*关闭端口1*/

printf("Bye~.\n");

}