openeit / eit_firmware Goto Github PK

OpenOCD is another Open Toolchain Option. Whichever toolchain it moves to the version of compilers, and install procedure should also be documented in a readme.

Here is a thread on the ADuCM350 forum that details current status.
https://ez.analog.com/thread/72704

Device returns only impedance magnitude in bis mode. It would be useful to also have the impedance phase.
It seems that CMSIS DSP library does not contain a function to calculate phase from complex values. ARM-software/CMSIS_5#293
It can be implemented via atan2 function with conversion to float (by @tachen-cs).

for (n = 0; n < numSamples; n++) {
pDst[n] = atan2(pSrc[(2n)+0] + pSrc[(2n)+1]);
} 

Currently the impedance measurement is completed then printed out the serial port. The serial port takes most of the time. Ideally, the impedance measurement is interrupt driven to ensure it is performed whether or not the serial port has finished writing, and with more precise timing.

Using accelerometer data would be great for noise mitigation. LIS3DH standard accelerometer on an I2C BUS.

I think there are examples in the ADuCM350 SDK.

This will make it easy to try different frequencies and spectroscopy sequences without having to reprogram the firmware.

These can be run faster and work well in tanks but not on the body. It would be good to have stim sequences that can run faster and bipolar sequences use half the number of measurements per reading thus can be run faster.