The problem is here, in bbb_dht_read.c
// Record pulse widths for the expected result bits.
for (int i=0; i < DHT_PULSES*2; i+=2) {
// Count how long pin is low and store in pulseCounts[i]
while (!bbb_mmio_input(pin)) {
if (++pulseCounts[i] >= DHT_MAXCOUNT) {
// Timeout waiting for response.
set_default_priority();
printf("PulseCounts[i]: %d \n",pulseCounts[i]);
return DHT_ERROR_TIMEOUT;
}
}
bbb_mmio_input(pin) returns 0 too much time and it returns
DHT_ERROR_TIMEOUT.
Il giorno domenica 12 febbraio 2017 16:59:02 UTC+1, Dennis Lee Bieber ha
scritto:
>
> On Sun, 12 Feb 2017 02:54:10 -0800 (PST), Davide Aguiari
> <[email protected] <javascript:>> declaimed the following:
>
> >Yes I read about it, but I tried several times without success.
> >I will try again tomorrow, but It's supposed to work 3 times of 4, not 1
> of
> >10..
> >
>
> Note that the article originally came out in 2012, and was last
> updated
> 2015. Are you running Wheezy or Jessie? It's possible Jessie has changed
> things enough to affect the timing -- especially if you are entering the
> demo program command at the console each time (the process start-up may be
> reproducing similar system timing, resulting in failure).
>
> Try modifying the demo program to loop internally -- maybe
> counting how
> many failures it gets before a successful read.
>
> Try running the demo at a higher priority level
>
> http://www.thegeekstuff.com/2013/08/nice-renice-command-examples/?utm_source=tuicool
>
> --
> Wulfraed Dennis Lee Bieber AF6VN
> [email protected] <javascript:> HTTP://wlfraed.home.netcom.com/
>
>
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