- #include <stdlib.h>
- #include <stdio.h>
- #include <unistd.h>
- #include <string.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <fcntl.h>
- #include <termios.h>
- #include <errno.h>
- #include <sys/time.h>
- #include <time.h>
-
- #define BUFFER_SIZE 16
- #define FALSE -1
- #define TRUE 1
-
- int speed_arr[] = { B38400, B19200, B9600, B4800, B2400, B1200, B300,
- B38400, B19200, B9600, B4800, B2400, B1200, B300, };
- int name_arr[] = {38400, 19200, 9600, 4800, 2400, 1200, 300,
- 38400, 19200, 9600, 4800, 2400, 1200, 300, };
-
- void set_speed(int fd, int speed);
- int set_Parity(int fd,int databits,int stopbits,int parity);
-
- int main(int argc,char *argv[])
- {
- char *interface = NULL,*filename = NULL;
-
- if (argc < 2)
- {
- interface = "/dev/ttyUSB0";
- filename = "hello.txt" ;
- }
- else
- {
- interface = argv[1];
- filename = argv[2];
- }
-
- int fd=open(interface,O_RDWR|O_NOCTTY|O_NDELAY);
- if(fd == -1)
- {
- printf("%s Open Error!\n",interface);
- return -1;
- }
- printf("open %s successfully !",interface);
-
- set_speed(fd,19200);
- if (set_Parity(fd,8,1,'N')== FALSE)
- {
- printf("Set Parity Error\n");
- exit(1);
- }
-
-
- int fp = open(filename,O_RDWR);
- if ( fp == -1 )
- {
- printf("open %s failured\n",filename);
- return -1;
- }
- int nread = 1;
- char buffer[BUFFER_SIZE] = {'\0'};
- int sum = 0;
-
- while(nread > 0)
- {
- int nwrite = 0;
- int tmp = 0,pos=0;
- nread = read(fp,buffer,BUFFER_SIZE);
- printf("读取字节数 : %d bytes \n",nread);
- int size_write = nread;
- while (size_write > 0)
- {
-
-
- tmp = (nwrite > tmp)? nwrite : tmp;
- pos = tmp ;
-
- nwrite = write(fd,buffer + pos,size_write);
- if (nwrite == -1)
- {
- sleep (2);
- continue;
- }
- sum = sum + nwrite;
- printf("写入字节数 : %d,剩余字节数 : %d \n",sum,size_write);
- size_write = size_write-nwrite;
- }
- }
- printf("sussfully write %s\n",filename);
- close(fp);
- close(fd);
- return 0;
- }
-
- 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]);
- status = tcsetattr(fd, TCSANOW, &Opt);
- if (status != 0)
- {
- perror("tcsetattr fd1");
- 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)
- {
- case 7:
- options.c_cflag |= CS7;
- break;
- case 8:
- options.c_cflag |= CS8;
- break;
- default:
- fprintf(stderr,"Unsupported data size\n");
- return (FALSE);
- }
- switch (parity)
- {
- case 'n':
- case 'N':
- options.c_cflag &= ~PARENB;
- options.c_iflag &= ~INPCK;
- break;
- case 'o':
- case 'O':
- options.c_cflag |= (PARODD | PARENB);
- options.c_iflag |= INPCK;
- break;
- case 'e':
- case 'E':
- options.c_cflag |= PARENB;
- options.c_cflag &= ~PARODD;
- options.c_iflag |= INPCK;
- break;
- case 'S':
- case 's':
- options.c_cflag &= ~PARENB;
- options.c_cflag &= ~CSTOPB;
- break;
- default:
- fprintf(stderr,"Unsupported parity\n");
- return (FALSE);
- }
-
- switch (stopbits)
- {
- case 1:
- options.c_cflag &= ~CSTOPB;
- break;
- case 2:
- options.c_cflag |= CSTOPB;
- break;
- default:
- fprintf(stderr,"Unsupported stop bits\n");
- return (FALSE);
- }
-
- if (parity != 'n')
- options.c_iflag |= INPCK;
- options.c_cc[VTIME] = 150;
- options.c_cc[VMIN] = 0;
-
- tcflush(fd,TCIFLUSH);
- if (tcsetattr(fd,TCSANOW,&options) != 0)
- {
- perror("SetupSerial 3");
- return (FALSE);
- }
- return (TRUE);
- }
|
评论暂时关闭