Based on "v3 Blackbox edition" https://github.com/sboesebeck/blackbox-firmware/
- Record two channels, can store it into one SDCARD.
- can be configured as mark channel 1 and 2, channle 1 is hardware serial port, the channel 2 is software serial port.
- Using IO6(TX) and IO8(RX) as soft serial port. (We don't use TX function)
- 115200 is working. But there is some crashing in bytes due to the soft serial. do not suggest for higher baudrate for dual channel.
- Buffer size is 128 bytes.
- 10 bytes time out for recording from buffer to SD card.
- Config file name need to match 8.3 format : "duconfig.txt"
