Hi .
I am trying to program STM in boot mode. With controller operating on 3.3v with SPI speed less than 1.25MHz is working fine. While increase in SPI communication speed leads to get NAC not acknowledgment from STM controller in boot mode and i have to make many attemps to program STM in boot mode for WRITE_MEMORY_COMMAND.
Where as using arduino which has operating voltage range of 0 -5 v is capable of doing the same job with higher SPI communication speed.
How do I program STM controller in boot with SPI speed more than 5MHz with host controller operating on 3.3v?
