Daniele Nicolodi wrote:
> Hello. In my application I need to read data from an ADC card in blocks
> of a given number of samples. For efficiency I'm using an mmapped buffer
> to exchange data with the ADC driver. I'm setting up the acquisition,
> and then calling a loop like this:
>
> unsigned int required = <compute required number of bytes>;
> unsigned int read = 0;
> while (1) {
> while (read < required) {
> read = a4l_pool(...);
> }
> process(buffer, ...);
> }
>
> However if I run this loop in a real time thread the tight while loop is
> an obvious cpu hog: the watchdog kicks in and kills the thread.
>
> There is not an analogy API that can be used to require a certain amount
> of data to the ADC driver. How can I code this loop to let other
> processes to run?
You should define a period, and how much data you want to process during
this period. Then make your task periodic, and wait for the next period
at the beginning of the loop.
>
> Thanks. Cheers,
--
Gilles.
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