I'm reverse engineering (troubleshooting) an odd ball circuit. The communication busI am looking at is 3 wire SPI, ie half duplex and the data is 7 bits, not 8.
The communication circuit has 3 wires: clock, data and chip select. There are 2 node: master and slave. The master generates the clock and chip select. The master sends a series of 7 bit words with CS low, then puts it high so the slave can respond, on the same wire. How would one decode this on an MSO5000 ?
I'm guessing that I am going to need to store the waveform for a communications even, download it to my PC and process it manually. Am I correct ?