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移植-在工控機下正常執行的串口液晶測試程序，到arm平台下不能正常執行

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在工控機下正常執行的串口液晶測試程序，到arm平台下不能正常執行

串口液晶屏在工控機上測試程序可行，到開發板上不行？
串口液晶使用的是SLCM19264
工控機系統為unbuntu10.04，編譯器gcc
開發板為arm的xm31平台，交叉編譯器arm-none-linux-gnueabi-gcc
程序如下
#include
#include
#include
#include
#include
#include
#include
#include
#include

int fd;

static void uart_set(int fd, int baud, int databits, char parity, int stopbits)
{
struct termios opt;

tcgetattr (fd, &opt);
opt.c_cflag |= (CLOCAL | CREAD);
printf("ispeed = %d\n", cfgetispeed(&opt));
printf("ospeed = %d\n", cfgetospeed(&opt));
switch (baud)
{
    case 9600:
        cfsetispeed(&opt, B9600);
        cfsetospeed(&opt, B9600);
        break;

    case 19200:
        cfsetispeed(&opt, B19200);
        cfsetospeed(&opt, B19200);
        break;

    case 57600:
        cfsetispeed(&opt, B57600);
        cfsetospeed(&opt, B57600);
        break;

    case 115200:
        cfsetispeed(&opt, B115200);
        cfsetospeed(&opt, B115200);
        break;

    default:
        cfsetispeed(&opt, B115200);
        cfsetospeed(&opt, B115200);
        break;
}

opt.c_cflag &= ~CSIZE;
switch (databits)
{
    case 7:
        opt.c_cflag |= CS7;
        break;

    case 8:
        opt.c_cflag |= CS8;
        break;

    default:
        printf ("Unsupported data size\n");
        return;
}

switch (parity)
{
    case 'n':
    case 'N':
        opt.c_cflag &= ~PARENB;

        break;

    case 'o':  // odd
    case 'O':
        opt.c_cflag |= (PARODD | PARENB);
        //opt.c_iflag |= INPCK;
        break;

    case 'e': // even
    case 'E':
        opt.c_cflag |= PARENB;
        opt.c_cflag &= ~PARODD;
        //opt.c_iflag |= INPCK;
        break;

    case 's':  //space
    case 'S':
        opt.c_cflag &= ~PARENB;
        opt.c_cflag &= ~CSTOPB;
        break;

    default:
        printf ("Unsupported parity\n");
        return;
}

switch (stopbits)
{
    case 1:
        opt.c_cflag &= ~CSTOPB;
        break;

    case 2:
        opt.c_cflag |= CSTOPB;
        break;

    default:
        printf ("Unsupported stop bits\n");
        return;
}


opt.c_cc[VTIME] = 0;
opt.c_cc[VMIN] = 0; 

// set raw input
opt.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
opt.c_iflag &= ~(INLCR | ICRNL | IGNCR);

// set raw output
opt.c_oflag &= ~OPOST;
opt.c_oflag &= ~OLCUC;
opt.c_oflag &= ~ONLRET;
opt.c_oflag &= ~ONOCR;
opt.c_oflag &= ~OCRNL;

tcsetattr (fd, TCSANOW, &opt);
printf("ispeed = %d\n", cfgetispeed(&opt));
printf("ospeed = %d\n", cfgetospeed(&opt));
tcflush(fd, TCOFLUSH);
tcflush(fd, TCIFLUSH);

}

void Display_info()
{
printf("%s\n", FUNCTION);
int ret;
char *s = "?";

char c = 0x3F;
char c2  = 0x0D;    

char c3 = 0x72;
char c4 = 0x65;
char c5 = 0x73;

ret = write(fd, &c, 1);
ret = write(fd, &c, 1);
ret = write(fd, &c, 1);
ret = write(fd, &c2, 1);
printf("write ok\n");
//ret = write(fd, "???", 3);
//ret = write(fd, "\r", 1);
usleep(DISPLAY_DELAY);

}

int main(int argc, char **argv)
{

int nread,i;
int nwrite;
unsigned char buff[1024] = {0};

if (argc == 1) {
if((fd=open_port(1, "/dev/ttyS0"))<0) {
perror("open_port error");
return -1;
}

} else {
if((fd=open_port(1, argv[1]))<0) {
perror("open_port error");
return -1;
}
}

printf("fd = %d\n", fd);
uart_set(fd, 19200, 8, 'n', 1);


    while(1) {
        //Display_Menu();
        Display_info(); 
        usleep(2000000);
        printf("ready read\n");
        nread = read(fd,buff,1024);

        printf("read ok\n");
        printf("nread=%d,%s\n",nread,buff);
    }



close(fd);
return 0;

}

狀況是運行程序後，write沒有寫進去，read返回nread = 0（類似沒有在串口接入任何東西的狀態）

已經做過的測試：
1.應用程序
用已有的程序實驗，在工控機上無問題（液晶屏，應用程序無錯）

2.驅動
短接2，3，發現輸出，輸入無問題（接口，驅動無錯）

懷疑：連線問題

結果：線序錯了

3.還是無反應
鏈接液晶屏端串口rt端口
自測有效，排除線的問題。

請問哪位大神知道還有可能是什麼問題導致的現在這種情況？？？