首页 / 操作系统 / Linux / Linux 串口驱动测试代码
#include <stdio.h> /*标准输入输出定义*/ #include <stdlib.h> /*标准函数库定义*/ #include <unistd.h> /*Unix 标准函数定义*/ #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> /*文件控制定义*/ #include <termios.h> /*PPSIX 终端控制定义*/ #include <errno.h> /*错误号定义*/ #include <string.h>#define FALSE -1 #define TRUE 0int speed_arr[] = { B115200, B57600, B38400, B19200, B9600, B4800, B2400, B1200, B300, }; int name_arr[] = {115200, 57600, 38400, 19200, 9600, 4800, 2400, 1200, 300, };unsigned char SetBaud_115200[14];void set_speed(int fd, int speed) { int i; int status; struct termios Opt; tcgetattr(fd, &Opt); for ( i= 0; i < sizeof(speed_arr) / sizeof(int); i++) { if (speed == name_arr[i]) { tcflush(fd, TCIOFLUSH); cfsetispeed(&Opt, speed_arr[i]); cfsetospeed(&Opt, speed_arr[i]); //printf("set baud:%d
", name_arr[i]); //用于设置终端的相关参数 status = tcsetattr(fd, TCSANOW, &Opt); //TCSANOW:不等数据传输完毕就立即改变属性 if (status != 0) { perror("tcsetattr fd"); return; } tcflush(fd,TCIOFLUSH); } } }int set_Parity(int fd,int databits,int stopbits,int parity) { struct termios options; if ( tcgetattr( fd,&options) != 0) { perror("SetupSerial 1"); return(FALSE); } options.c_cflag &= ~CSIZE; switch (databits) /*设置数据位数*/ { case 7: options.c_cflag |= CS7; break; case 8: options.c_cflag |= CS8; break; default: fprintf(stderr,"Unsupported data size
"); return (FALSE); } switch (parity) { case "n": case "N": options.c_cflag &= ~PARENB; /* Clear parity enable */ options.c_iflag &= ~INPCK; /* Enable parity checking */ break; case "o": case "O": options.c_cflag |= (PARODD | PARENB); /* 设置为奇效验*/ options.c_iflag |= INPCK; /* Disnable parity checking */ break; case "e": case "E": options.c_cflag |= PARENB; /* Enable parity */ options.c_cflag &= ~PARODD; /* 转换为偶效验*/ options.c_iflag |= INPCK; /* Disnable parity checking */ break; case "S": case "s": /*as no parity*/ options.c_cflag &= ~PARENB; options.c_cflag &= ~CSTOPB;break; default: fprintf(stderr,"Unsupported parity
"); return (FALSE); } /* 设置停止位*/ switch (stopbits) { case 1: options.c_cflag &= ~CSTOPB; break; case 2: options.c_cflag |= CSTOPB; break; default: fprintf(stderr,"Unsupported stop bits
"); return (FALSE); } /* Set input parity option */ if (parity != "n") options.c_iflag |= INPCK; tcflush(fd,TCIOFLUSH); options.c_cc[VTIME] = 50; /* 设置超时5 seconds*/ options.c_cc[VMIN] = 0; /* Update the options and do it NOW */ options.c_cc[VINTR] = 0; /**//* Ctrl-c */ options.c_cc[VQUIT] = 0; /**//* Ctrl- */ options.c_cc[VERASE] = 0; /**//* del */ options.c_cc[VKILL] = 0; /**//* @ */ options.c_cc[VEOF] = 0; /**//* Ctrl-d */ options.c_cc[VSWTC] = 0; /**//* "" */ options.c_cc[VSTART] = 0; /**//* Ctrl-q */ options.c_cc[VSTOP] = 0; /**//* Ctrl-s */ options.c_cc[VSUSP] = 0; /**//* Ctrl-z */ options.c_cc[VEOL] = 0; /**//* "" */ options.c_cc[VREPRINT] = 0; /**//* Ctrl-r */ options.c_cc[VDISCARD] = 0; /**//* Ctrl-u */ options.c_cc[VWERASE] = 0; /**//* Ctrl-w */ options.c_cc[VLNEXT] = 0; /**//* Ctrl-v */ options.c_cc[VEOL2] = 0; /**//* "" */ options.c_cflag |= (CLOCAL | CREAD); //忽略DCD信号 options.c_cflag &= ~CRTSCTS; //关硬件流控制 options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); //关回显 options.c_oflag &= ~OPOST; //行式输出 options.c_iflag &= ~(IXON | IXOFF | IXANY); //关软件流控制 if (tcsetattr(fd,TCSANOW,&options) != 0) { perror("SetupSerial 3"); return (FALSE); } return (TRUE); }int OpenDev(char *Dev) { int fd = open( Dev, O_RDWR | O_NOCTTY); //| O_NOCTTY | O_NDELAY if (-1 == fd) { perror("Can"t Open Serial Port"); return -1; } else return fd; }int main(int argc, char **argv) { int uart_fd; int nread, nwrite; int num = 0; char rev_char[128]; char rev_buf[128]; char *buff="hello! this is a serial test program,if you can see this,you success!
"; char *dev = "/dev/ttyAMA2"; //串口二 uart_fd = OpenDev(dev); //打开设备 set_speed(uart_fd, 9600); //设置波特率 if (set_Parity(uart_fd,8,1,"n") == FALSE) //数据位,停止位,校验位 { printf("Set Parity Error
"); exit (0); } while(nread = read(uart_fd, rev_char, 1)) //读返回值 { rev_buf[num++] = rev_char[0]; if (rev_char[0] == "
") { rev_buf[num] = " "; num = 0; printf("%s", rev_buf); } printf("%s", rev_buf); if((nwrite = write(uart_fd,buff,strlen(buff)))>0) { printf("%s
",buff); } } if (nread == 0) printf("No DATE!
"); } close(uart_fd); }
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