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Keeping PA15 low during the init

Akshit Singhal
Associate II

‎2020-12-20 9:25 PM

Hi community,

I'm using STM32F303RE, in that I'm using PA15 as a GPIO which is connected to a Relay, but I recently found out that the PA15 is a JTDI pin which is being pulled up internally, so whenever the STM32 resets, it gets high and after GPIO_init is executed it goes lows. It's causing relay trigger.

Kindly help!

Regards

Akshit Singhal

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TDK
Guru

‎2020-12-21 5:16 AM

You can't change the behavior of PA15 on reset. Use a different pin with an external pulldown.

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