I've worked on this issue with exactly the same problem on STM32L151:
SDU1.config->usbp->transmitting(or receiving) bit for the endpoint is raised but STAT_TX(or STAT_RX) remains NAK, which causes the driver cannot transit hardware to VALID state anymore.
I found that if IN and OUT are mapped to ...
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- Mon Jan 19, 2015 4:34 am
- Forum: STM32 Support
- Topic: Serial over USB problem
- Replies: 39
- Views: 27158