USB host无法识别U盘

发布于 2020-06-20 21:12:07 浏览：1951 订阅该版

使用RTT的usb host模式，并增加对`mass storage`的支持。但是插上U盘后，无法枚举，系统一直报HC_XACTERR，调整硬件也无效。
```
usb connected
port 1 status 0x10201
reset port
USB start emulation
```
但是插入USB串口，可以正确识别，并获取设备ID。
```
usb connected
port 1 status 0x10201
reset port
USB start emulation
ok
pipe transform remain size,: 8
ok
pipe transform pipe_ep0_in size,: 8
pipe transform remain size,: 0
ok
dev type 0x1
dev usb v 0x200
reset port
usb disconnnect
usb connected
rt_usb_set_address
ok
pipe transform remain size,: 0
ok
get device descriptor length 18
ok
pipe transform remain size,: 18
ok
pipe transform pipe_ep0_in size,: 18
pipe transform remain size,: 0
ok
Vendor ID 0x67b
Product ID 0x2303
ok
pipe transform remain size,: 18
ok
pipe transform pipe_ep0_in size,: 18
pipe transform remain size,: 0
ok
ok
pipe transform remain size,: 39
ok
pipe transform pipe_ep0_in size,: 39
pipe transform remain size,: 0
ok
ok
pipe transform remain size,: 0
ok
rt_usb_get_interface_descriptor: 0
interface class 0xff, subclass 0x0
rt_usb_get_endpoint_descriptor: 0
rt_usb_get_endpoint_descriptor: 1
rt_usb_get_endpoint_descriptor: 2
find usb device driver failed
port 1 status 0x201
port 1 status 0x201
```
大家有没有碰到过这种问题？