- pick either usart1 or usart2 on PD5/6 or PA9/10 for bootloader
- flash and companion can share an SPI, sensors need dedicated SPI
- use 3 screws for v_pyro, either jumper to tie to v_lipo or attach
- pick either usart1 or usart2 on PD5/6 or PA9/10 for bootloader
- flash and companion can share an SPI, sensors need dedicated SPI
- use 3 screws for v_pyro, either jumper to tie to v_lipo or attach