xiuos\Ubiquitous\RT-Thread_Fusion_XiUOS\aiit_board\xidatong-arm32\applications\main.c：

1.添加usb测试函数

Ubiquitous/RT-Thread_Fusion_XiUOS/aiit_board/xidatong-arm32/applications/main.c

@@ -48,3 +48,68 @@ static void sdram_test2(void)
 }
 MSH_CMD_EXPORT(sdram_test2, sdram test2);
 #endif
+
+#ifdef BSP_USB1_HOST
+#include <dfs_posix.h>
+static char test_data[120], buffer[120];
+#define TEST_FN     "/testusb.c"
+void readwrite(const char* filename)
+{
+    int fd;
+    int index, length;
+
+    fd = open(TEST_FN, O_WRONLY | O_CREAT | O_TRUNC, 0);
+    if (fd < 0)
+    {
+        rt_kprintf("open file for write failed\n");
+        return;
+    }
+
+    for (index = 0; index < sizeof(test_data); index ++)
+    {
+        test_data[index] = index + 27;
+    }
+
+    length = write(fd, test_data, sizeof(test_data));
+    if (length != sizeof(test_data))
+    {
+        rt_kprintf("write data failed\n");
+        close(fd);
+        return;
+    }
+
+    close(fd);
+
+    fd = open(TEST_FN, O_RDONLY, 0);
+    if (fd < 0)
+    {
+        rt_kprintf("check: open file for read failed\n");
+        return;
+    }
+
+    length = read(fd, buffer, sizeof(buffer));
+    if (length != sizeof(buffer))
+    {
+        rt_kprintf("check: read file failed\n");
+        close(fd);
+        return;
+    }
+
+    for (index = 0; index < sizeof(test_data); index ++)
+    {
+        if (test_data[index] != buffer[index])
+        {
+            rt_kprintf("check: check data failed at %d\n", index);
+            close(fd);
+            return;
+        }
+    }
+
+    rt_kprintf("usb host read/write udisk successful\r\n");
+
+    close(fd);
+}
+
+MSH_CMD_EXPORT(readwrite, usb host read write test);
+
+#endif