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OK so half 1 we acquired our wiring labored out and located an index pulse. Half 2 is we began getting MFM knowledge popping out. Now we’re capturing pulses with gpio bitbanging, and storing all the heart beat widths in a big reminiscence array. every monitor has a 500Khz sign, and outputs knowledge each 5 Hz, so we now have a max of 100K samples worst case.
since we’re utilizing a cortex arm with 192K~256K of RAM (the RP2040 has 264K!), its no biggie to retailer all of the pulses in an array. right here we’re studying monitor 1 and binning the pulses: we’re seeing three pulse width bins stand out, about 40 rely, 62 rely and 85 rely. however there’s additionally a pair extremely quick pulses (25 rely) and an extremely lengthy pulse (~200 rely).
every rely is about 48ns-ish in order that interprets to 2us, 3us and 4us bins, with a couple of 1us and one or two 10us+. not precisely positive whats up with these outliers. will we ignore them? are they start-of-data markers? We additionally observed that monitor 0 has far more unusually lengthy or unbinned pulses, like nearly 100 completely different values. its a bit of mysterious, we’ll have to analyze if there’s one thing particular about monitor 0!
Half 2:
Half 1:
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