Battery monitor ADC not functional
The TCO Monitor contains two ADCs, one for the ECG and one for the battery. The Clock and Chip Select lines are shared, and both have their own MISO lines. This violates the normal SPI conventions. The PIC processor in the original design accepted this, but the Teensy doesn't want to clock a second SPI interface using the clock of the first. Sometimes garbarge is received. The Batt Low led on the device is purely analog, and remains functional.