I need to read all 7 analog pins in the BBB every 5 milliseconds. I'm
doing so with the following C code:
...
while(1){
fread(&value_str, 6, 6, f0);
value_int = strtol(value_str,NULL,0);
printf("0 %li\n", value_int);
fflush(stdout);
usleep(5000);
rewind(f0);
}
Hoever, the cpu usage goes up really high (20%). Is there any way to
read the analog inputs differently so that it doesn't use as much CPU?
I would replace "printf("0 %li\n", value_int); fflush(stdout);" by
saving the converted values into an array, and print the values only
when the measurement ist finished.
Someone suggested "DMA" but I'm completely lost on that regard...
That would be for specialists
Christian
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