you have to figure out how to properly flow control the upstream link.
but that too is problematic.
you are basically generating a lot of data and them converting it to ascii
chars (which makes the problem worse) and then sending over a relatively
slow line. It looks like chars are being blocked.
you can try going to a binary format and doing the printing upstairs.
you can also try putting back pressure onto the source of the data. that
is stop taking samples.
On Wed, Dec 14, 2016 at 7:15 PM, desword <cgl1428719...@163.com> wrote:
> Currently, I am intending to record the cca and sfd value using a timer.
> Due to the high frequency sampling rate (5ms/ sample), the output of the
> printf would flush themselves like follows:
>
> [26804][26820]cca:1, sfd:0.
> [26823][26831]cca:1, sfd:0.
> [26834]cca:1, sfd:0.
> [26841]cca:1, [26847]cca:0, sfd:0.
> [26853][26868]cca:0, sfd:1.
> [26876][26895]cca:1, sfd:0.
> [26898][26914]cca:1, sfd:0.
> [26917]cca:1, sfd:0.
> [26924]cca:1, [26928]cca:1, sfd:0.
> [26934][26938]cca:1, sfd:0.
> [26946][26965]cca:1, sfd:0.
> [26968][26985]cca:1, sfd:0.
> [26988][26994]cca:1, sfd:0.
> [26998][27014]cca:1, sfd:0.
> [27020]cca:1, sfd:0.
> [27027]cca:1, [27036]cca:1, sfd:0.
> [27040][27055]cca:1, sfd:0.
> [27058][27074]cca:0, sfd:0.
> [27077][27084]cca:0, sfd:0.
> [27087]cca:0, sfd:0.
> [27097]cca:1, [27100]cca:1, sfd:0.
> [27107][27116]cca:1, sfd:0.
> [27119][27135]cca:1, sfd:0.
>
>
> However, the correct format of output data should be "[time]cca:x, sfd:x".
> like follows:
>
> [269842]cca:0, sfd:0.
> [269859]cca:1, sfd:0.
> [269872]cca:1, sfd:0.
> [269887]cca:0, sfd:1.
> [269905]cca:0, sfd:0.
> [269918]cca:0, sfd:0.
> [269932]cca:1, sfd:0.
> [269947]cca:0, sfd:0.
> [269962]cca:0, sfd:0.
> [269977]cca:0, sfd:0.
> [269992]cca:1, sfd:0.
> [270007]cca:0, sfd:0.
> [270024]cca:0, sfd:0.
> [270038]cca:1, sfd:0.
> [270053]cca:0, sfd:0.
> [270067]cca:0, sfd:0.
> [270082]cca:1, sfd:0.
>
> So how to achieve the high rate sampling and recording with intended data
> format? My code is based on the TestNetworkLplC.nc, and I just add the
> periodic sampling timer as follows.
>
>
>
> event void WhiteSpaceTimer.fired(){
> uint32_t cur = call Timer.getNow();
> printf("[%ld]cca:%d, sfd:%d.\n", cur, call CCA.get(), call SFD.get());
> }
>
> The WhiteSpaceTimer is set to 5ms. and the packet send interval and wakeup
> interval both are 60ms.
>
> Is there any approach can achieve my purpose ? Thanks!
>
>
>
>
>
>
>
> --
> View this message in context: http://tinyos-help.10906.n7.
> nabble.com/how-to-printf-the-sample-data-with-a-high-
> sampling-rate-tp25034.html
> Sent from the TinyOS - Help mailing list archive at Nabble.com.
> _______________________________________________
> Tinyos-help mailing list
> Tinyos-help@millennium.berkeley.edu
> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
>
--
Eric B. Decker
Senior (over 50 :-) Researcher
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