nqBASIC

Hello all,

I am evaluating a nanoCore12 (40 pin) with docking module.  I would like to measure at a fixed rate 6 analog values.  The A/D example available, show how 1 channel is measured, however the sampling rate is not considered.  I must sample the 6 channels, at or faster than 600sample/s; it is important for the sampling rate to be consistent.

Any hints / examples?

I have tried timing the board and have questions.  If I set up the A/D to take 1 measurement (A.ADC_Start (WAIT, ADC_MODE_8ONCE)), start it and then read, for every sample, a conversion takes about 9 microseconds.  If I set up the A/D for A.ADC_Start (WAIT, ADC_MODE_8CONTINUOUS), I can get A/D values in less than 2microseconds; it seems too fast...  How do I know if I get a new converted value, or if I just keep many times the last converted value, until it gets overwritten by a new conversion?  The documentation talks about a Done function for the A/D (A.ADC_Done (status)), however the compiler does not like it (ie the function does not seem to be in the library)?

Daniel

I have done some timing measurements, have nice plots in a docx word file, or a pdf file; for some reason, when I tried uploading these files, the board returned "This file type not allowed".

Anyway, the bottom line is, a A/D takes about 50 usec; can start the A/D for every conversion, or set it up to continuously convert.  If it continuously converta, an ADC_Read will return a value in about 0.5 usec, but that value is NOT necessarily the latest conversion value; to obtain a read for each conversion, do reads less often than once every 50 usec.

Daniel