clock_gpio_init_int_frac() function
Output an optionally divided clock to the specified gpio pin.
Arguments
gpio
The GPIO pin to output the clock to. Valid GPIOs are: 21, 23, 24, 25. These GPIOs are connected to the GPOUT0-3 clock generators.
src
The source clock. See the register field CLOCKS_CLK_GPOUT0_CTRL_AUXSRC for a full list. The list is the same for each GPOUT clock generator.
div_int
The integer part of the value to divide the source clock by. This is useful to not overwhelm the GPIO pin with a fast clock. this is in range of 1..2^24-1.
div_frac
The fractional part of the value to divide the source clock by. This is in range of 0..255 (/256).