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[单片机资料] iMX6的USB之 OTG功能研究

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[LV.9]元老将成

发表于 2018-8-10 21:16:24 | 显示全部楼层 |阅读模式

USB接口上有4个管脚,OTG功能有5个。原来4个分别是电 D+ D- 地。 现在增加了一个ID。这个ID线就决定了自己做主设备还是从设备。如果ID线是高则自己是从设备,反之是主设备。

USB_OTG_ID定义为W23,即GPIO1_IO24

/test/gpio_get.sh24用来读出gpio value。读出来总是0:低电平。所以也不知道前面这句描述是对是错了。


imx6 kernel configas:

-> USB GadgetDrivers (<choice> [=m])

->File-backedStorage Gadget(USB_FILE_STORAGE [=m]) 。记得:不是选massstorage. 而且选模块方式,以方便安装模块时输入参数。


内置驱动时,测试打印:

g_file_storagegadget: controller 'fsl-usb2-udc' not recognized

g_file_storagegadget: No serial-number string provided!

g_file_storagegadget: no file given for LUN0

显然,这就是模块参数未给定导致的。


编译模块:

makeM=drivers/usb/gadget/ modules

得到

root@ubuntu:/home/imx6s/linux-3.0.101#make M=drivers/usb/gadget/ modules

  Building modules, stage 2.

  MODPOST 1 modules

  LD [M] drivers/usb/gadget/g_file_storage.ko


root@imx6s ~$insmod /lib/modules/g_file_storage.ko file=/dev/mmcblk0

g_file_storagegadget: controller 'fsl-usb2-udc' not recognized

g_file_storagegadget: No serial-number string provided!

g_file_storagegadget: File-backed Storage Gadget, version: 1 September 2010

g_file_storagegadget: Number of LUNs=1

g_file_storagegadget-lun0: ro=0, nofua=0, file: /dev/mmcblk0

Suspend udc forOTG auto detect

fsl-usb2-udc: bindto driver g_file_storage

root@imx6s ~$g_file_storage gadget: high speed config #1


win7也同时显示说找到设备驱动,磁盘驱动器:linux File-Stor Gadget USB Device

下面反复插拔USB-PC线几次,然后换成USB-SD卡,都是可以的。但再换回USB-PC线就不行了,找不见设备。

root@imx6s ~$g_file_storage gadget: high speed config #1


root@imx6s ~$g_file_storage gadget: high speed config #1


root@imx6s ~$

root@imx6s ~$g_file_storage gadget: high speed config #1


root@imx6s ~$

root@imx6s ~$ usb1-1: new high speed USB device number 2 using fsl-ehci

usb 1-1: devicev0930 p6545 is not supported

scsi0 :usb-storage 1-1:1.0

scsi 0:0:0:0irect-Access     TOSHIBA  TransMemory      PMAP PQ: 0 ANSI: 4

sd 0:0:0:0: [sda]30489408 512-byte logical blocks: (15.6 GB/14.5 GiB)

sd 0:0:0:0: [sda]Write Protect is off

sd 0:0:0:0: [sda]No Caching mode page found

sd 0:0:0:0: [sda]Assuming drive cache: write through

sd 0:0:0:0: [sda]No Caching mode page found

sd 0:0:0:0: [sda]Assuming drive cache: write through

sda: sda1

sd 0:0:0:0: [sda]No Caching mode page found

sd 0:0:0:0: [sda]Assuming drive cache: write through

sd 0:0:0:0: [sda]Attached SCSI removable disk


root@imx6s ~$ usb1-1: USB disconnect, device number 2

wait otg vbuschange timeout!


root@imx6s ~$ usb1-1: new high speed USB device number 3 using fsl-ehci

usb 1-1: devicev0930 p6545 is not supported

scsi1 :usb-storage 1-1:1.0

scsi 1:0:0:0:Direct-Access     TOSHIBA TransMemory      PMAP PQ: 0 ANSI:4

sd 1:0:0:0: [sda]30489408 512-byte logical blocks: (15.6 GB/14.5 GiB)

sd 1:0:0:0: [sda]Write Protect is off

sd 1:0:0:0: [sda]No Caching mode page found

sd 1:0:0:0: [sda]Assuming drive cache: write through

sd 1:0:0:0: [sda]No Caching mode page found

sd 1:0:0:0: [sda]Assuming drive cache: write through

sda: sda1

sd 1:0:0:0: [sda]No Caching mode page found

sd 1:0:0:0: [sda]Assuming drive cache: write through

sd 1:0:0:0: [sda]Attached SCSI removable disk


root@imx6s ~$

root@imx6s ~$ usb1-1: USB disconnect, device number 3

wait otgvbus change timeout!


root@imx6s ~$

root@imx6s ~$ usb1-1: new high speed USB device number 4 using fsl-ehci

usb 1-1: devicev0930 p6545 is not supported

scsi2 :usb-storage 1-1:1.0

scsi 2:0:0:0:Direct-Access     TOSHIBA  TransMemory      PMAP PQ: 0 ANSI: 4

sd 2:0:0:0: [sda]30489408 512-byte logical blocks: (15.6 GB/14.5 GiB)

sd 2:0:0:0: [sda]Write Protect is off

sd 2:0:0:0: [sda]No Caching mode page found

sd 2:0:0:0: [sda]Assuming drive cache: write through

sd 2:0:0:0: [sda]No Caching mode page found

sd 2:0:0:0: [sda]Assuming drive cache: write through

sda: sda1

sd 2:0:0:0: [sda]No Caching mode page found

sd 2:0:0:0: [sda]Assuming drive cache: write through

sd 2:0:0:0: [sda]Attached SCSI removable disk

usb 1-1: USBdisconnect, device number 4

wait otg vbuschange timeout!


USB在host模式时,才需要对外输出电源。slave mode时,不需要输出电源,但也不影响工作。

电源管脚:

IMX_GPIO_NR(4, 15),111

/test/gpio_set.sh111 0 //关pwr      

实测不影响工作。其实,我觉得USB_ID和USB_VBUS就没什么关系。


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