I have set up i2c bit banging (bashing) on my Orange Pi one not without difficulty, There are three issues I would like to explore:
- existing drivers, gpioiic - nanosleep - input/output on same gpio pin Nanosleep What is the resolution on arm? When I tried to use to stretch the output pulses the timing was unusable. When creating a square wave with ioctl the shortest period I can get is about 4 to 6 microseconds due to the execution time of the code. If I try to stretch the pulse width with nanosleep the pulse width goes to a minimum of 20 milliseconds even with a count of only 1 nanosecond. I tried running nanosleep for ½ second (count of 500,000,000) for 1000 iterations and the timing seems to be correct. Could nanosleep take 20 milliseconds to set up?
