PC不识别Gadget HID
本帖最后由 ylscat 于 2013-6-9 16:37 编辑我想把TQ2416做成一个模拟的USB键盘，但是PC总是识别为未知设备。我没什么驱动经验，请技服给予指点！
代码修改的步骤如下：
我参考了linux kernel的一个例子写的，https://www.kernel.org/doc/Documentation/usb/gadget_hid.txt
1 linux-3.1_TQ2416/arch/arm/mach-s3c2416/mach-tq2416.c
添加hid设备注册:
#include <linux/usb/g_hid.h>
/* hid descriptor for a keyboard */
static struct hidg_func_descriptor my_hid_data = {
.subclass = 0, /* No subclass */
.protocol = 1, /* Keyboard */
.report_length = 8,
.report_desc_length = 63,
.report_desc = {
0x05, 0x01, /* USAGE_PAGE (Generic Desktop) */
0x09, 0x06, /* USAGE (Keyboard) */
0xa1, 0x01, /* COLLECTION (Application) */
0x05, 0x07, /* USAGE_PAGE (Keyboard) */
0x19, 0xe0, /* USAGE_MINIMUM (Keyboard LeftControl) */
0x29, 0xe7, /* USAGE_MAXIMUM (Keyboard Right GUI) */
0x15, 0x00, /* LOGICAL_MINIMUM (0) */
0x25, 0x01, /* LOGICAL_MAXIMUM (1) */
0x75, 0x01, /* REPORT_SIZE (1) */
0x95, 0x08, /* REPORT_COUNT (8) */
0x81, 0x02, /* INPUT (Data,Var,Abs) */
0x95, 0x01, /* REPORT_COUNT (1) */
0x75, 0x08, /* REPORT_SIZE (8) */
0x81, 0x03, /* INPUT (Cnst,Var,Abs) */
0x95, 0x05, /* REPORT_COUNT (5) */
0x75, 0x01, /* REPORT_SIZE (1) */
0x05, 0x08, /* USAGE_PAGE (LEDs) */
0x19, 0x01, /* USAGE_MINIMUM (Num Lock) */
0x29, 0x05, /* USAGE_MAXIMUM (Kana) */
0x91, 0x02, /* OUTPUT (Data,Var,Abs) */
0x95, 0x01, /* REPORT_COUNT (1) */
0x75, 0x03, /* REPORT_SIZE (3) */
0x91, 0x03, /* OUTPUT (Cnst,Var,Abs) */
0x95, 0x06, /* REPORT_COUNT (6) */
0x75, 0x08, /* REPORT_SIZE (8) */
0x15, 0x00, /* LOGICAL_MINIMUM (0) */
0x25, 0x65, /* LOGICAL_MAXIMUM (101) */
0x05, 0x07, /* USAGE_PAGE (Keyboard) */
0x19, 0x00, /* USAGE_MINIMUM (Reserved) */
0x29, 0x65, /* USAGE_MAXIMUM (Keyboard Application) */
0x81, 0x00, /* INPUT (Data,Ary,Abs) */
0xc0 /* END_COLLECTION */
}
};
static struct platform_device my_hid = {
.name = "hidg",
.id = 0,
.num_resources = 0,
.resource = 0,
.dev.platform_data = &my_hid_data,
};
static struct platform_device *tq2416_devices[] __initdata = {
...
&s3c_device_usbgadget,
&my_hid,
}
2 修改menuconfig
Device Drivers -> HID devices -> USB human interface (full support)
Device Drivers -> USB support -> USB gadget support -> HID Gadget
3 加载模块
把编译的zImage烧写，进入命令行，insmod g_hid.ko。
这个时候windows发现了未知的设备，无法识别。
出现了文件/dev/hidg0
然后串口出现了如下信息：
hub 1-0:1.0: Cannot enable port 2.Maybe the USB cable is bad?
hub 1-0:1.0: Cannot enable port 2.Maybe the USB cable is bad?
hub 1-0:1.0: Cannot enable port 2.Maybe the USB cable is bad?
hub 1-0:1.0: Cannot enable port 2.Maybe the USB cable is bad?
hub 1-0:1.0: unable to enumerate USB device on port 2
我猜测可能是USB时钟没有配置，因为论坛贴问过这事，《S3C2416 USB HOST 裸机问题》
还有就是没有把CPU的USB port1配置为Device function。
请教各位大牛，给予指点。最好给点配置的例子，比如2410/2440怎么配的（kernel是3.1的）
TQ2416要使用device功能是需要修改TQ2416的usb device驱动源码，完善时钟之类的初始化，完成这个操作就可以使用usb了。 把PHYCTRL寄存器的值改为0就可以了。见drivers/usb/gadget/s3c-hsudc.c
static void s3c_hsudc_init_phy(void)
{
...
writel(0, S3C2443_PHYCTRL);
...
} ylscat 发表于 2013-6-9 16:36 static/image/common/back.gif
把PHYCTRL寄存器的值改为0就可以了。见drivers/usb/gadget/s3c-hsudc.c
static void s3c_hsudc_init_phy(v ...
是的，是修改这个地方。
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