Hi! > > IMHO, firstly we should take this trigger into kernel, most time it > > works as a module. But we need to define a good interface between > > kernel and user space. > > You need the interface defined first. To do that it needs to reflect the > actual hardware accelerated devices, and also to deal with resource > management for those devices if necessary (eg if they can only manage one > led of a set at a time). Hardware can do quite a lot: http://wiki.maemo.org/LED_patterns#Lysti_Format_Engine_Patterns_and_Commands (and more). I implemented compiler for it (should we put it into tools/ somewhere?) https://gitorious.org/tui/tui/source/5b3f5cacf8e208d3ea50d6066e549940d85e55be:maemo/notcc.py It can do quite a lot, including prime number computation. This uses 33% of program memory and only one of three execution units; but it does not work, maybe I made mistake somewhere or maybe our kernel can't take program this long. It only has 3 writable variables, which is quite limiting. start() a = 1 next_number: a += 1 b = 1 next_divisor: b += 1 br = b if (b==a) goto is_prime c = 0 c = c+b test_prime: if (c==a) goto not_prime if (a<c) goto not_divisor c = c+b goto test_prime not_divisor: goto next_divisor not_prime: goto next_number is_prime: b = 0 show_prime: c = 255 br = c ramp_up_long(30,0) c = 0 br = c ramp_up_long(30,0) b += 1 if (b == a) goto next_number2 goto show_prime next_number2: goto next_number > So the starting point has to be the hardware accelerated devices, whether > you then support software emulation in kernel or user space is a follow > on discussion. What the kernel/user API is also has to be a follow on Well... this one is turing complete, and I have a compiler, but I don't think it is good interface, either for library or kernel. I believe series of RGB values might be good interface, maybe with additional "want interpolation between these". Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
