stm32f407 - no cortex m sw device

wellsmark87 · ‎2014-10-31

Posted on October 31, 2014 at 14:43

Hi,

I'm a student starting to develop on my STM32F407 using uVision,

I'm struggling on getting my board to link to my pc, I have installed the USB drivers but I still get the error ''no cortex M sw device'' from my sw link.

The link did work for the first time and then since has not responded.

Is there a quick fix for this that i am over looking.

Mark

#stm32f407

Tesla DeLorean · ‎2014-10-31

Posted on October 31, 2014 at 16:18

If it worked originally, and you downloaded broken code into it, the you might want to configure the ST-LINK (or whatever you're using) to ''Connect under reset''. Or alternatively pull BOOT0 High at reset so it runs the System Loader code in ROM, erase the part, and start over.

If you have an ST-LINK, perhaps use it's utilities and erase the part that way.

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wellsmark87 · ‎2014-11-02

Posted on November 02, 2014 at 16:23

Worked first time, amazing!

thank you