linux串口传输资料

linux串口传输文件需要从FPGAm上传输文件到PC机上，下面是串口传输文件的小程序，可以测试下串口buffer的大

linux串口传输文件

需要从FPGAm上传输文件到PC机上，下面是串口传输文件的小程序，可以测试下串口buffer的大小，我电脑上大概4K多，也可以测试串口寄存器大小读入读出大小，我这里是32bytes。

write.c

#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 MAX 1024#define FALSE -1#define TRUE 1int 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/ttyACM0";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|O_CREAT);if ( fp == -1 ){printf("open %s failured\n",filename);return -1;}int nread = 1,nwrite = 0;char buffer[BUFFER_SIZE] = {'\0'};while(1){nread = read(fd,buffer,BUFFER_SIZE);   if (nread > 0){//printf("读取 %d bytes \n",nread);nwrite = write(fp,buffer,nread);//printf("写入 %d bytes \n",nwrite);if (nwrite <= 0){printf("write into file finished n");break;}}}printf("sussfully get %s\n",filename);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) /*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\n");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\n");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\n");return (FALSE);}/* Set input parity option */if (parity != 'n')options.c_iflag |= INPCK;options.c_cc[VTIME] = 150; // 15 secondsoptions.c_cc[VMIN] = 0;tcflush(fd,TCIFLUSH); /* Update the options and do it NOW */if (tcsetattr(fd,TCSANOW,&options) != 0){perror("SetupSerial 3");return (FALSE);}return (TRUE); }