EXEC = uart_rawOBJS = uart_raw.oSRC  = http://www.mamicode.com/uart_raw.c>

  1 #include <stdio.h>  2 #include <stdlib.h>  3 #include <unistd.h>  4 #include <sys/types.h>  5 #include <sys/stat.h>  6 #include <fcntl.h>  7 #include <termios.h>  8 #include <errno.h>  9 #include <limits.h> 10 #include <unistd.h> 11 #include <string.h> 12 #include <signal.h> 13  14 #define DEV_NAME "/dev/ttyS2" 15  16 int testi=0; 17 //不调用 18 int recv_protocol(int uart_fd,char* buf, int n) 19 { 20     int rc, i; 21     int count = 0; 22      23         while(read(uart_fd, buf, n) >0) 24         { 25             printf("recv serial----rc is %d   testi is %d \n  ",rc,testi); 26             for(i = 0; i < n; i++) 27                 printf(" %x ", buf[i]); 28         } 29         printf("no while !!!\n"); 30         for(i = 0; i < n; i++) 31                 printf(" %x ", buf[i]); 32      33         printf("\n"); 34      35     tcflush(uart_fd, TCIOFLUSH); 36     return rc; 37 } 38  39 // 等待时间  串口描述符  读取的buff 40 int Select_Tart_Read(struct timeval tv,int  uart_fd,char* buff) 41 { 42      43     memset(buff,0,sizeof(char)*8); 44     fd_set rfds; 45     int retval=0; 46     int i; 47      48     FD_ZERO(&rfds); 49     FD_SET(uart_fd, &rfds); 50      51     retval=select(uart_fd + 1, &rfds, NULL, NULL, &tv); 52     if(retval<0) 53     {   54         perror("select error\n");   55     } 56     else 57     {   58         if( retval &&   FD_ISSET(uart_fd, &rfds)  ) 59         { 60             testi++; 61             printf("FD_ISSET!\n"); 62             int rc=read(uart_fd, buff, 8); 63             if(rc>0) 64             { 65                 printf("recv serial----rc is %d   testi is %d \n  ",rc,testi); 66                 for(i = 0; i < 8; i++) 67                 printf(" %x ", buff[i]); 68                 printf("\n"); 69                 return rc; 70             } 71         }     72     }     73     return 0; 74 } 75  76  77 int monitor_routine( int  uart_fd) 78 { 79     int i; 80     printf("in  monitor_routine\n"); 81      82     char rebuff[8];//设置最大的数据长度为8个 83     memset(rebuff,0,sizeof(char)*8); 84     struct timeval tv; 85     tv.tv_sec = 0; 86     tv.tv_usec = 10000; 87     int retval; 88     unsigned char commbuff[8];//设置最大的数据长度为8个 89     memset(commbuff,0,sizeof(unsigned char)*8); 90      91     while(1) 92     { 93         //printf("retval is %d\n",retval); 94         if(Select_Tart_Read(tv,uart_fd,rebuff)>0)// 95         { 96             printf("in while Read!\n"); 97             for(i = 0; i < 8; i++) 98                 printf(" %x ", rebuff[i]); 99             printf("\n");100         }101     }102     return 0;103 }104 105 106 int main(int argc, char *argv[])107 {108         int iFd, i;109         int len;110         unsigned char ucBuf[100];111         struct termios opt;112 113         iFd = open(DEV_NAME, O_RDWR | O_NOCTTY);114 115         if(iFd < 0) {116                 perror(DEV_NAME);117                 printf(" open /dev/ttyS2 faurel!\n");118                 return -1;119         }120         else 121             printf(" open /dev/ttyS2 !\n");122         tcgetattr(iFd, &opt);123         cfsetispeed(&opt, B115200);124         cfsetospeed(&opt, B115200);125 126         if (tcgetattr(iFd,   &opt)<0) {127                   return   -1;128         }129         opt.c_lflag    &= ~(ECHO | ICANON | IEXTEN | ISIG);130         opt.c_iflag    &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);131         opt.c_oflag     &= ~(OPOST);132         opt.c_cflag     &= ~(CSIZE | PARENB);133         opt.c_cflag     |=  CS8;134 135         opt.c_cc[VMIN]     = 255;136         opt.c_cc[VTIME]    = 150;137 138         if (tcsetattr(iFd,   TCSANOW,   &opt)<0) {139                 return   -1;140         }141         tcflush(iFd,TCIOFLUSH);142         143         144         for (i = 0; i < 100; i++){145                 ucBuf[i] = 0xff - i;146         }147         148         149         char buff[6];150         buff[0]=0x05;buff[1]=0x05;buff[2]=0x05;buff[3]=0x05;buff[4]=0x05;buff[5]=0x05;151         152         153         printf("buff is :\n");154         for(i=0;i<6;i++)155             printf("0x%x ",buff[i]);156         printf("\n");157         158         printf("write buff!!!");159         160         len = write(iFd, buff, 6);161         162         if(len < 0) {163              164             printf(" write error ! \n");165             return -1;166         }167         168         printf("in main monitor_routine\n");169         170         monitor_routine(iFd);171         172         printf("\n");173 174 175 176         close(iFd);177         return 0;178 }