Chip select

[lucagessi-scmgroup]

When writing data using SPI don't you need to make low CS and high again after spi communicatin?

[Xenoamor]

The STM32 bootloader does not use the chip select line to mark the start/end of packets so it can remain low the entire time. I believe you can raise and lower it if you like but it won't achieve anything

Note that it must be low during transactions however