Posted on April 23, 2013 at 01:36I am trying to read the device electronic signature in an STM32F40x device while the device is in DFU mode.
The signature is 12 bytes, found at 0x1FFF7A10. DFU_DNLOAD (Set Address Pointer) works (or at least returns STDFU_NOERROR). The STDFU_UPLOAD call after that to get the data does not work.
I have 2 questions regarding this:
1) Is it possible? The signature seems to be located just after the OTP area, and it may not be accessible to the bootloader.
2) What would I pass in for the block number parameter on STDFU_Upload? I have tried to pass 2, which makes sense from the formula for addressing on page 12 of AN3156, but doesn't work. The upload command returns STDFU_NOERROR, but the buffer is null.
Thank you
chrisp
