About MZadn.2

MZadn.2 · 2022-10-08

I have a 3x4 matrix keyboard attached to STM32F401, see schematics (the U4 represents a "black pill" PCB). PB0, PB1, PB2 are column outputs in push-pull mode. PC15, PA0, PA1, PB10 are row inputs in EXTI mode with pull-ups enabled.The circuit worked a...

MZadn.2 · 2022-08-21

I need the RTC module to be enabled in order to write to & read from backup registers on STM32F401 using these functions:void HAL_RTCEx_BKUPWrite(RTC_HandleTypeDef *hrtc, uint32_t BackupRegister, uint32_t Data) uint32_t HAL_RTCEx_BKUPRead(RTC_HandleT...

MZadn.2 · 2022-10-09

@Piranha: no pull-up on NRST installed on my board originally.I narrowed the problem to the PB0 & PB1 outputs. Only those two prevent the MCU from starting when they are connected to the keyboard. A workaround was to leave them at default reset state...

MZadn.2 · 2022-09-03

Thanks for the tip, this is indeed a more elegant way. I was erroneously supposing that the definition of BKP0R won't be included in the code generated by STM32CubeIDE when RTC is disabled.

MZadn.2 · 2022-09-01

Hi Jan & Kaouthar, thanks for your feedback,I tend to agree with Jan. Here's what I've made:I temporarily enabled the RTC in STM32CubeIDE configurator, just like explained under point 5. in the link that Kaouthar pastedI put some diagnostic output in...

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STM32F401 won't start

Can I use backup registers when RTC is disabled?

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Re: Can I use backup registers when RTC is disabled?

Re: Can I use backup registers when RTC is disabled?