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?
Thanks. Cheers,
--
Daniele
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