When sending the first initial SYNC (0x7F) byte to the STM32N6 boot ROM over UART, the boot ROM replies with two ACK (0x79) bytes, while only one ACK is sent as a response to later SYNCs. Is the boot ROM guaranteed to always reply with two ACKs to the first SYNC?
First sync:
Later syncs:
Hello,
I got an internal feedback regarding the behavior:
In AN5275, regarding the command descriptions, it appears that both the first byte and the last byte are ACKs. This suggests that there are two ACKs for commands such as Get (0x00), Get Version (0x01), and Get ID (0x02)...
Although this is not explicitly described in the document, it is reasonable to assume that a similar behavior may also apply to the synchronization message, with a high probability of the same ACK pattern being used.
Hope that helps.
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