> > I couldn't find that reset mode in the hal_parport. At least not how you
> > could have a step that lasted 5uS when the base period
> was 35uS. How's that timing calculated?
>
> setp parport.0.reset-time 5000
> In the doc I linked earlier
Ends up being reset_time in the reset_port() function. Can't find when or
how reset_port() is called.
Looks a lot like the system sets up a loop inside one of the tasks burning CPU
cycles until 5 micro-seconds has passed by calling the rtapi_get_clocks()
function.
if(port->reset_time > period/4) port->reset_time = period/4;
reset_time_tsc = ns2tsc(port->reset_time);
if(outdata != port->outdata) {
deadline = port->write_time + reset_time_tsc;
while(rtapi_get_clocks() < deadline) {}
rtapi_outb(outdata, port->base_addr);
}
I do something similar (as a temporary measure until I get the FREE RTOS
installed) The LED is just there so I can verify the time delay with the
scope. But I'm not fond of that technique.
void
Delay10uS(int32 delay) {
uint32 timedelay;
bANB_LED3 = 1; // For now pulse LED so we can see if it's being used in
normal LCD operations.
timedelay = ReadCoreTimer() + (400*delay);
while (ReadCoreTimer() < timedelay) ;
bANB_LED3 = 0;
}
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