用c语言写的一个程序，通过fread函数读取一个bit文件(ucos.bin文件),每次读取4个字节
到缓冲区中，然后用write函数写入到开发板中，文件在读取到1024次后停止，有知道的帮忙解决一下吗?
#include
#include
#include
#include
#include
#include
#include
/* baudrate settings are defined in , which is
included by /
#define BAUDRATE B9600
/ change this definition for the correct port /
#define MODEMDEVICE "/dev/ttyUSB0"
#define _POSIX_SOURCE 1 / POSIX compliant source */
#define FALSE 0
#define TRUE 1
void main(int argc, char ** argv)
{
int err = 0;
int fd,c, res;
struct termios oldtio,newtio;
char buf[1];
/*
Open modem device for reading and writing and not as controlling tty
because we don't want to get killed if linenoise sends CTRL-C.
*/
fd = open(MODEMDEVICE, O_RDWR | O_NOCTTY );
if (fd <0) {perror(MODEMDEVICE); exit(-1); }
tcgetattr(fd,&oldtio); /* save current serial port settings /
bzero(&newtio, sizeof(newtio)); / clear struct for new port settings */
/*
BAUDRATE: Set bps rate. You could also use cfsetispeed and cfsetospeed.
CRTSCTS : output hardware flow control (only used if the cable has
all necessary lines. See sect. 7 of Serial-HOWTO)
CS8 : 8n1 (8bit,no parity,1 stopbit)
CLOCAL : local connection, no modem contol
CREAD : enable receiving characters
*/
newtio.c_cflag = BAUDRATE | CS8 | CLOCAL | CREAD;//| CRTSCTS
/*
IGNPAR : ignore bytes with parity errors
ICRNL : map CR to NL (otherwise a CR input on the other computer
will not terminate input)
otherwise make device raw (no other input processing)
*/
newtio.c_iflag = IGNPAR; //| ICRNL;
/*
Raw output.
*/
newtio.c_oflag = 0;
/*
ICANON : enable canonical input
disable all echo functionality, and don't send signals to calling program
*/
// newtio.c_lflag = ICANON;
/*
now clean the modem line and activate the settings for the port
*/
tcflush(fd, TCIFLUSH);
tcsetattr(fd,TCSANOW,&newtio);
FILE* fp;
if(argc<2) fp = fopen("inst_rom.bin","rb");
else fp = fopen(argv[1],"rb");
if(!fp){
printf("Cannot open file\n");
}
int i=0;
printf(">> Start Trans\n");
while (!feof(fp)) {
i++;
fread(buf,4,1,fp);
if(!feof(fp)){
res = write(fd,buf,4);
if(res!=4)err++;
printf("%d: %d, ",i,res);
if(i%5==4)printf("\n");
usleep(100);
}
}
printf("end while");
for(i=0;i<4;i++)
buf[i]=-1;
printf("buf assigned");
res = write(fd,buf,4);
printf("\n<< Send FF*4\n");
printf("Err: %d\n",err);
printf("Goto: 0x0\n=====\n");
int rec;
while(1){
rec = read(fd,buf,1);
if(rec>0) printf("%c",buf[0]);
}
/* restore the old port settings */
tcsetattr(fd,TCSANOW,&oldtio);
}
