IMX6DL连电脑USB_OTG无法识别

[yinkai]

参考IMX6DUALLITE开发板画了一个板子，PMIC输出各路电压和时序都正确，上电后24MHZ晶振起振，32.768KHZ晶振空贴，连接电脑后显示无法识别的设备，但是在LINUX操作系统下可以显示HID信息，板子上USB_OTG_ID这个管脚我画在了GPIO_1，未做上下拉处理，开发板上USB_OTG_ID用的是ENET_RX_ER管脚，会不会是这个原因引起的或者还有其他原因。

[yinkai]

HI,DAN WANG

USB_OTG_ID我用的是GPIO_1管脚，必须使用ENET_RX_ER管脚吗？板上ENET_RX_ER管脚是悬空的末引出来。用GPIO_1行不行？谢谢。

[Rita_Wang]

Hi yin kai,

It's OK that you use the GPIO_1 for USB_OTG_ID. But the voltage should be provided right.

Here you can refer to iMX6DL : Is the USB_OTG_ID pin necessary for USB boot (Serial Downloader) ? . Hope this can help you.

Have a nice day

Dan

[Rita_Wang]

Hi yin kai,

Here it  caused by the USB_OTG_ID, the USB_OTG_ID pin need 2.5 V or 3.3 V voltage. Details you can refer to the IMX6DL

datasheet and you also can refer to our reference board design.

On the  USB_OTG no Recognized, you can do the follows test:

1\BOOT_MODE0 = 1; BOOT_MODE1 = 0

2\USB_OTG_ID pin 2.5 V or 3.3 V voltage

3\ The USB_OTG_VBUS of CPU need 5 V voltage
Have a great day,
Dan

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[yinkai]

USB_OTG_ID这个管脚我画在了GPIO_1上了，必须要用ENET_RX_ER管脚吧，现在ENET_RX_ER管脚是悬空的。谢谢