@Christopher-Bunnell the dash is probably pretty similar to the onion hologram since they were pretty much developed at the same time. if you can find the pinout sheet for the dash and also the pinout and maybe tech reference for the onion you might be able to cross reference the pins that onion uses with the onion cellular and just match those same pins from the dash and using wires plug those dash pins into a onion expansion, anyone of the expansions should do.
There are random corruptions happening on the SPI display, where some other pixels outside of the normal rectangle are overwritten. I don't know yet if that's an issue in my driver (timing violations maybe?) or with the SPI interface, but because the entire frame is overwritten each tick, the corruption is only visible for a short amount of time.
ICSP is (SPI like and is,) using synchronous serial (CLK, MOSI, and MISO) method to perform in-circuit programming.
You have to find a proper library to perform such task, probably in bitbanging style.
It seems that you would then get the maximum response from your sonar, and then shuttle the data from the arduino chip one to the omega. For around $25 (20 for the dock, and around 4-5 for the sensor) you could get this done much in the same way you have before, without having to depend on linux timing being a bit inadequate for the task.