Hello all, InSpace is considering using an STM32 chip as the MCU for our flight computer this year. We're building a custom board around the chip for our specific application. We're considering the STM32 family because it's popular among rocketry teams and is often used in flight computers.
In the MCU listing the two most well documented variants are the STM32F7 and F4 it seems, but we're having trouble deciphering how we would flash the MCU with NuttX from the instructions for the individual boards and on the main MCU page. Example for the STM32F7, this page doesn't mention the programming interface/process: https://nuttx.apache.org/docs/latest/platforms/arm/stm32f7/index.html Looking at an individual board with an F7 chip, the page for the Nucleo doesn't mention it either: https://nuttx.apache.org/docs/latest/platforms/arm/stm32f7/boards/nucleo-f722/index.html The page for the board says it can only be programmed using ST-Link. We've done some research and found that most STM32s were using the ST-Link programmer for programming, but it is also possible to load programs over USB using a USB bootloader on some chips. We figured we should check here first if anyone who had experimented with STM32 chips knows offhand whether or not it's possible to program over a USB interface, how to do it with the NuttX build environment, or if it requires additional hardware. I recalled seeing a porting livestream on the NuttX channel and checked out the board with an STM32F4 by Lucas Zampar, and it appears to have serial wire debug and JTAG programming interfaces. I see there is also a USB interface but I'm not sure if programming over it is possible: https://github.com/lucaszampar/NuttX_STM32F4_RS485_DevBoard/blob/main/PDF/NuttX_STM32F4_RS485.pdf If so, it would be great to know how that is achieved! Many resources mention a USB bootloader but I'm not sure if it's first required to upload the bootloader over SWD before being able to use it. I'm also not sure how this looks specifically with NuttX's build system. It's highly possible I am just missing seeing some relevant information in the NuttX docs but I can't seem to find what I'm looking for. Thanks, Matteo
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