About GKerc.1

GKerc.1 · 2020-05-18

Hello,I'm trying to control the boot behavior of my STM32L412 development board which has a floating BOOT0 hardware pin.I'm trying to clear the SWBOOT0 bit in FLASH_OPTR using firmware. So far I am able to unlock the register and clear the bit. Th...

GKerc.1 · 2020-05-14

I set up DMA for a USART transmit operation with an ST32L412. Settings are 115200 baud, 8 data bits, no parity. I thought everything was working until I noticed the third character in all my outbound data not showing up. It turns out the default BY...

GKerc.1 · 2020-05-22

Thank you again for the reply Uwe. I am following the exact recipe in "3.4.2" and now it appears to be working. I had issues with my prototype board's power supply which I believe were causing issues with reset and FLASH_OPTR values. Working wit...

GKerc.1 · 2020-05-19

Thank you for the reply, Uwe. I wasn't setting OPTSTRT in my initial attempt.After trial and error, I found that setting the FLASH_CR->OPTSTRT bit *before* writing to the FLASH_OPTR allows the contents to survive a power cycle or a system reset.I kn...

GKerc.1 · 2020-05-15

Thank you for the reply Guenael. I agree that byte alignment should work. But I tried this at multiple baud rates and the result is always the same. The third character of the outbound payload is not transmitted. The only thing slightly different...

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How to program FLASH_OPTR register to survive system reset?

STM32L412 USART transmit using DMA drops characters, must use HALFWORD alignment

Re: How to program FLASH_OPTR register to survive system reset?

Re: How to program FLASH_OPTR register to survive system reset?

Re: STM32L412 USART transmit using DMA drops characters, must use HALFWORD alignment