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STM32F405 Odd DFU behaviour

Question asked by traud.jason on Aug 18, 2015
Latest reply on Aug 24, 2015 by traud.jason
I'm experiencing some odd behaviour when attempting to place an STM32F405 into DFU mode. Currently, what works on one peice of hardware is that is that I send the STM32 a command to tell it to go into DFU mode, and a secondary processor pulls BOOT0 high. I've verified that the state of the BOOT0 and BOOT1 pins are as expected.

This works on some units, but not others. I was under the impression that the BOOT pins were triggered on an interrupt and were hands off. Is there some specific initialization I'm supposed to be performing on the boot pins to achieve the desired behaviour?

EDIT:// 
The main application note I've found to put the device into DFU mode is application note AN26026.

http://www.st.com/st-web-ui/static/active/en/resource/technical/document/application_note/CD00167594.pdf

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