Linux下串口C语言编程.doc

串口操作代码#include #include #include #include #include #include #include #include #include #define BUFFER_SIZE 1024#define HOST_PORT 1int set_port(int fd, int baud_rate, int data_bits, char parity, int stop_bits) struct termios newtio,oldtio; if( tcgetattr(fd,&oldtio) != 0) perror(Setup Serial 1); return -1; bzero(&newtio,sizeof(newtio); newtio.c_cflag |= CLOCAL | CREAD; newtio.c_cflag &= CSIZE; /* set baud_speed*/ switch(baud_rate) case 2400: cfsetispeed(&newtio,B2400); cfsetospeed(&newtio,B2400); break; case 4800: cfsetispeed(&newtio,B4800); cfsetospeed(&newtio,B4800); break; case 9600: cfsetispeed(&newtio,B9600); cfsetospeed(&newtio,B9600); break; case 19200: cfsetispeed(&newtio,B19200); cfsetospeed(&newtio,B19200); break; case 38400: cfsetispeed(&newtio,B38400); cfsetospeed(&newtio,B38400); break; default: case 115200: cfsetispeed(&newtio,B115200); cfsetospeed(&newtio,B115200); break; /* set data_bits upon 7 or 8*/ switch(data_bits) case 7: newtio.c_cflag |= CS7; break; default : case 8: newtio.c_cflag |= CS8; break; /*/ switch(parity) default: case N: case n: newtio.c_cflag &= PARENB; newtio.c_iflag &= INPCK; break; case o: case O: newtio.c_cflag |= (PARODD | PARENB); newtio.c_iflag |= INPCK; break; case e: case E: newtio.c_cflag |= PARENB; newtio.c_cflag &= PARODD; newtio.c_iflag |= INPCK; break; case s: case S: newtio.c_cflag &= PARENB; newtio.c_cflag &= CSTOPB; break; /*set stop_bits 1 or 2 */ switch(stop_bits) default: case 1: newtio.c_cflag &= CSTOPB; break; case 2: newtio.c_cflag |= CSTOPB; break; newtio.c_ccVTIME = 0; newtio.c_ccVMIN = 1; tcflush(fd,TCIFLUSH); if(tcsetattr(fd,TCSANOW,&newtio) != 0) perror(com set error); return -1; printf(set UART done!n); return 0;int open_port(int com_port) int fd = 0; char *dev = /dev/ttyS0, /dev/ttyS1, /dev/ttyS2,/dev/ttyS3, /dev/ttyS4, /dev/ttyS5, /dev/ttyS6; if(com_port 6) ) printf(the port is out range); return -1; fd = open(devcom_port, O_RDWR | O_NOCTTY | O_NDELAY); if(fd 0) perror(open serial port); return -1; if(fcntl(fd, F_SETFL,0) 0) perror(fcntl F_SETFL); return -1; if(isatty(fd) = 0) perror(isatty is not a terminal device); return -1; return fd;int main(void) int fd = 0; char BUFFERBUFFER_SIZE = 0; if(fd = open_port(HOST_PORT) = -1) perror(open port); return -1; if(set_port(fd,115200,8,N,1)= -1) perror(set port); return -1; do printf(Input some words:n); memset(buffer,0,BUFFER_SIZE); if(fgets(buffer,BUFFE