I have a write only register in my circuit design to control some LEDs and chip selects. I have code that maps the address using mmap_device_memory() and writes to the register. I maintain a copy of the written value as its write only. The chip selects will be accessed from drivers but the LEDs will be accessed from the applicaiton level. What would be the correct framework to add this functionality to my QNX image? For example do I need to make a small driver application that starts with the other drivers, how then would I access it from other processes?