HML Sniffer

I finally got around to putting together the SPI sniffer I mentioned back on 26-July. The only problem is that I left all the crystals in my cube at work, so I couldn’t give it a test run tonight. I think the software is functional, but I have no good way of being sure yet.

Oh, there is also this photo of the oscilloscope screen showing little blips of data, from when I hooked the scope up to one of the SPI lines, just to be sure that I could see something.

Most of tonight was spent putting together things on the breadboard, making the DB9 cables, making the leads for the micro clips, and writing the interrupt handler (feeds SPI data into the FIFO for writing out via the UART). Hopefully I’ll get more done tomorrow. My hope is that by the end of the Thanksgiving weekend I’m able to understand what is going on between the PIC and IEbus controller, and thusly (hopefully) the rest of the vehicle. From there I will (hopefully) be able to start getting an idea of what actually needs to go into firmware for the HML itself.