How to get STM32F105 into DFU mode?

Hi!

I got a custom board and having problem to get F105RCT6 MCU into DFU mode when connected to USB-cable and PC. Is there anyone the have some suggestions that can help me?

I also tried to get connected using USB to TTL with no success. Then I tried PA9/PA10 for USART1_TX and USART1_RX..

All help is appriciated

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Former Member over 8 years ago in reply to gadget.iom +1

Hi Paul! Thanks for the reply. No, I have not tested PA9. I will give this a try and is hopeful. I have a question regarding if Nreset pin 7 always should be connected to Vdd? On my custom board this is…

0 gadget.iom over 8 years ago

Have you tried connecting PA9/OTG_FS_VBUS to +3.3V?
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0 Former Member over 8 years ago in reply to gadget.iom

Hi Paul!

Thanks for the reply. No, I have not tested PA9. I will give this a try and is hopeful.

I have a question regarding if Nreset pin 7 always should be connected to Vdd? On my custom board this is the case and I wonder if this can cause the problem due to I cannot physically do a reset with a switch as it is right now. But I can do a modification if needed to cut the line for Nreset so this is not connected to Vdd if this could help. Hope you can understand my description.
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0 Former Member over 8 years ago in reply to gadget.iom

I read in AN2606 regarding DFU.
https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Attachments/18225/AN2606.pdf

Your correct, PA9 should have +5V.

However there is one statement that I dont understand on p14 of 55:
USART1_RX (PA10), USART2_RX (PD6) and CAN2_RX (PB5) pins must be kept at a high or low level during the detection phase

I dont have PD6 on my 64 pin F105RCT6 MCU.

Does this mean that USB DFU does not work or what do you think?
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0 clem57 over 8 years ago in reply to Former Member

Maybe this can help http://cache.freescale.com/files/microcontrollers/doc/app_note/AN4370.pdf . But this explains more https://my.st.com/public/STe2ecommunities/mcu/Lists/STM32F%20MEMS%20%20iNEMO/Flat.aspx?RootFolder=https%3a%2f%2fmy%2est%…
Clem
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