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THamb · 2019-09-24

I am trying to use the SPI bootloader on a Nucleo F446ZE board and have problems when issuing commands. The symptom is that every other command is not acknowledge and every other works fine. Trying for instance the GET_VERSION command gives the follo...

THamb · 2019-10-01

There is absolutely nothing going on. At least nothing that shows up on the logic analyzer. I have run commands back to back (see image and table with communication data), and get the same behavior every time. I have also tried do the ack procedure w...

THamb · 2019-09-30

Here is the sequence with a working command. I cannot manage to get two commands in a row that succeed. I modified the code so that if the bootloader does not respond 0x79 on the third byte in the command I resend the command. The command then work a...

THamb · 2019-09-30

Here are the signals from the communication. To the right is a table with the MOSI and MISO sequence. I agree that it seems something is out of sync. T

THamb · 2019-09-26

It seems as Figure 4. "SPI command frame" in AN4286 is not accurate. The system seems to work fine when ignoring what is returned by the bootloader in the third byte of the command frame. The specification indicates that the bootloader should return...

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SPI bootloader fails to accept every other command.

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