Signature Creator for NXP Cortex-M Devices Algorithm for creating the checksum The reserved Cortex-M3 exception vector location 7 (offset 0x001C in the vector table) should contain the 2’s complement of the check-sum of table entries 0 through 6. Thi…
http://stm32f4-discovery.com/2015/01/properly-set-clock-speed-stm32f4xx-devices/ I see that you have problems with your devices when you don’t know even (and you don’t even ask) on which speed your device is actually running. Speed of your device dep…