Is it possible to have 2 stable clock signals on gpio pins? Is there an easy way to do this on a OrangePi Zero with armbian os? I want 2 clocks with a programmable frequency in the range between 100 kHz and 4 MHz. I made this on a raspberry pi zero by dividing the 1000 MHz system clock by an integer. One becomes a stable low noise square wave that can be used in amateur radio.