I am trying to store configuration data in flash on the STM32L151CB-A using the HAL libraries. I reserved the last page in flash for this. However, I see that already at the beginning of main the OPTVERR bit is set. (FLASH->SR: 0x80C) I never program...

I am working on the readout of a GPS module on the Rak811 tracker board featuring an STM32L151CB processor. My program showed very strange effects and after longish debuggginb I found out that the stack pointer was wrongly set at entry of me man prog...