re-enumerate USB on STM32F103

Forum|Forum|6 years ago
November 20, 2019
3 replies
1612 views

CDC function run normally. But if MCU reboot(For example, USB connect to PC and reboot MCU), USB will not recongnized. It will return to normal if I remove USB then insert it again.

So I want to add re-enumerate function to let device re-enumerate though USB always in PC.

How to modify the code to realize re-enumerate function?
I try to set PA12 low to high before USB init. Device cannot run. Maybe blocking

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Best answer by Uwe Bonnes

If you want a work-around that is not standard compliant, switch PA12 to GPIO/Open Drain, set it low for about 10 ms, and than set up USB. This works for Bl*ckm*gic debug probes.

Uwe BonnesBest answer

Chief

If you want a work-around that is not standard compliant, switch PA12 to GPIO/Open Drain, set it low for about 10 ms, and than set up USB. This works for Bl*ckm*gic debug probes.