Usb Host 读写失败

发布于 2022-02-21 17:45:24 浏览：1537 订阅该版

2 个回答

张世争 2022-02-22

学以致用

HELLO_HI 2022-02-22

这家伙很懒，什么也没写！

这是运行的例程，串口打印输出的信息
static void readwrite_sample(void)
{
    int fd, size;
    char s[] = "RT-Thread Programmer!", buffer[80];
    rt_kprintf("Write string %s to test.txt.\n", s);
    /* 以创建和读写模式打开 /text.txt 文件，如果该文件不存在则创建该文件*/
    fd = open("/text.txt", O_WRONLY | O_CREAT);
    if (fd >= 0)
    {
        write(fd, s, sizeof(s));
        close(fd);
        rt_kprintf("Write done.\n");
    }else {
        rt_kprintf("Write fail.\n");
    }
    /* 以只读模式打开 /text.txt 文件 */
    fd = open("/text.txt", O_RDONLY);
    if (fd >= 0)
    {
        size = read(fd, buffer, sizeof(buffer));
        close(fd);
        rt_kprintf("Read from file test.txt : %s \n", buffer);
        if (size < 0)
            return ;
    }else {
        rt_kprintf("Read  fail.\n");
    }

}
MSH_CMD_EXPORT(readwrite_sample, readwrite sample);
msh />found part[0], begin: 61440, size: 7.512GB
readwrite_sample
Write string RT-Thread Programmer! to test.txt.
request size 512, transfer size 0
pipe status error
out pipe error
usb mass_storage write 1 sector failed
CBW size error
usb mass_storage write 1 sector failed
Write done.
Read from file test.txt : R
msh />list_device
device         type         ref count
------ -------------------- ----------
ud0-0  Block Device         1
usbh   USB Host Bus         0
uart2  Character Device     2
pin    Miscellaneous Device 0
msh />ls
Directory /:
System Volume Information<DIR>
电电~1.DOC        10911952
电电~1.PDF        3085594
电电~2.DOC        17221
text.txt            0
msh />