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63 lines
2.0 KiB
Lua
63 lines
2.0 KiB
Lua
-- Acquire ADC samples as quickly as possible, without the use of a timer
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-- provides statistics on time and memory usage while running
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if pd.board() == "ET-STM32" then
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adcchannels = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}
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adcsmoothing = {4, 4, 4, 4, 16, 16, 16, 16, 32, 32, 32, 32, 64, 128, 64, 128}
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numiter = 50
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else
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adcchannels = {0,1,2,3}
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adcsmoothing = {4, 16, 64, 128}
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numiter = 200
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end
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-- Setup ADC
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for i, v in ipairs(adcchannels) do
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adc.setblocking(v,1) -- block, waiting for samples when an adc.get* function is used
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adc.setclock(v,0) -- set clock to zero: no timer, acquire samples as fast as possible
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adc.setsmoothing(v,adcsmoothing[i]) -- apply moving average filter using lengths from adcsmoothing
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end
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-- Draw static text on terminal
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term.clrscr()
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term.print(1,1,"ADC Status:")
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term.print(1,3," CH SLEN RES")
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term.print(1,#adcchannels+7,"Press ESC to exit.")
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-- Use some locals for speed
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local adcvals = {}
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local key, stime, etime, dtime, i, v
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local sample = adc.sample
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local insertsamples = adc.insertsamples
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local tread = tmr.read
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local tstart = tmr.start
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while true do
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stime = tstart(0) -- start timer
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for j=1,numiter do -- acuire numiter samples
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sample(adcchannels, 1)
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for i, v in ipairs(adcchannels) do
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insertsamples(v,adcvals,i,1) -- for each iteration j, get samples and put them in adcvals
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end
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end
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etime = tread(0) -- get cycle end time
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dtime = tmr.diff(0,etime,stime)/numiter -- compute average acquisition time per cycle
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-- draw last acquired samples on the console
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term.moveto(1,4)
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for i, v in ipairs(adcchannels) do
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term.print(string.format("ADC%02d (%03d): %04d\n", v, adcsmoothing[i],adcvals[i]))
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term.moveto(1,i+4)
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end
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-- draw acquisition statistics
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term.print(string.format("Tcyc: %06d (us)\n",dtime))
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term.print(1,#adcchannels+5,string.format("Mem: %03.2f (kB)\n",collectgarbage("count")))
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key = term.getchar( term.NOWAIT )
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if key == term.KC_ESC then break end -- exit if user hits Escape
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end
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term.clrscr()
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term.moveto( 1 , 1 )
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