Question

我已经购买了jpeg相机（C429-L36）。

结合互联网上的一些示例，我已经完成了该程序：

int main()
{

int USB = open( "/dev/ttyUSB1",  O_RDWR | O_NOCTTY | O_SYNC );
struct termios tty;
/* Set Baud Rate */
cfsetospeed (&tty, (speed_t)B115200);
cfsetispeed (&tty, (speed_t)B115200);

/* Setting other Port Stuff */
tty.c_cflag     &=  ~PARENB;            // Make 8n1
tty.c_cflag     &=  ~CSTOPB;
tty.c_cflag     &=  ~CSIZE;
tty.c_cflag     |=  CS8;

tty.c_cflag     &=  ~CRTSCTS;           // no flow control
tty.c_cc[VMIN]   =  1;                  // read doesn't block
tty.c_cc[VTIME]  =  15;                  // 0.5 seconds read timeout
tty.c_cflag     |=  CREAD | CLOCAL;     // turn on READ & ignore ctrl     lines

/* Make raw */
cfmakeraw(&tty);

tcsetattr ( USB, TCSANOW, &tty ) ;


char response[261];
unsigned char cmd[20];

cmd[0] = 0x56;
cmd[1] = 0x00;
cmd[2] = 0x11;

cmd[3] = 0x00;

write(USB, cmd, 4);
sleep(1);

read(USB, response, 16);

for(int i = 0; i< 16;++i)
{
    printf("%c", response[i]);
    fflush(stdout);
}

cmd[0] = 0x56;
cmd[1] = 0x00;
cmd[2] = 0x3;
cmd[3] = 0x01;
cmd[4] = 0x00;

write(USB, cmd, 5);
sleep(1);
read(USB, response, 5);

cmd[0] = 0x56;
cmd[1] = 0x00;
cmd[2] = 0x34;
cmd[3] = 0x01;
cmd[4] = 0x00;

tcflush(USB,TCIOFLUSH);

write(USB, cmd, 5);


sleep(1);


int n = 0;

n = read( USB, response, 9 );

int length = 0;
unsigned int res;
if(n == 9)
{
   if(response[3] == 0x00 && response[4] == 0x04)
    {
    res = (response[8] & 0xFF);
    res += (response[7] & 0xFF) << 8;
    res += (response[6] & 0xFF) << 16;
    res += (response[5] & 0xFF) << 24;  
    }
}


int addr = 0;

FILE* f =  fopen("photo.jpg", "wb");

int bytes = 255;
while(addr != res)
    {

    if(res - addr < bytes)
        bytes = res-addr;
    else
        bytes = bytes;

    printf("%d\n", addr);
    fflush(stdout);
cmd[0] = 0x56;
cmd[1] = 0x00;
cmd[2] = 0x32;
cmd[3] = 0x0C;
cmd[4] = 0x00;
cmd[5] = 0x0A;
cmd[6] = (addr >> 24) & 0xFF;
cmd[7] = (addr >> 16) & 0xFF;
cmd[8] = (addr >>  8) & 0xFF;
cmd[9] = (addr & 0xFF);
cmd[10] = 0;
cmd[11] = 0;
cmd[12] = 0;
cmd[13] = bytes;
cmd[14] = 1;
cmd[15] = 0;


write(USB, cmd, 16);

sleep(1);

read(USB, response, 5);

read(USB, response, bytes);

fwrite(response, bytes, 1, f);


addr += bytes;
}

fclose(f);

return 0;
}

它工作正常，控制器版本良好，FBuffer Length好，当我读取缓冲区时，文件以正确的魔术字（0xFF 0xD8）开始，但未以正确的魔术字（0xFF 0xD9）结尾奇怪，因为文件大小与已声明的FBuffer大小一致。

有人可以帮助我吗？谢谢。浮动。

VC0706相机和损坏的jpeg图像

0 个答案: