On Thu, 3 Jan 2002 [EMAIL PROTECTED] wrote: > Hello, > > We are making a demo on an Intrinsyc development board that has a StrongARM SA1110. >OS is HardHat Linux. We want to use a GPIO pin as a PWM. Using this PWM we can make a >backlight by switching some LEDs. > > We already tried using the kernel timers of linux, but they were too slow to make a >decent PWMfrequency (100Hz max gave a flickering backlight). We experimented with >threads yesterday, but they are apparently also dependent of the kernel timers. > Using microdelay is also not an option since it occupies the processor, so nothing >else can be done during the waiting time. > > What we are looking for is a way to switch a GPIO pin as fast as possible in the >background of an application. We want to implement all this in a module. > > any ideas or suggestions?
Look in the linux-arm-kernel mailing list archive of last december or november for a thread about FIQ. You'll find code examples there. Nicolas _______________________________________________ http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm Please visit the above address for information on this list.
