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The code for generating a clock on GPIO 6 (clk2) does not output the correct frequency

gpioHardwareClock(6,5000000);

Its is no where near the value, my logic analyzer is showing about 680Khz range

enter image description here

I know that the pin is capable of generating the clock since i tested it with another code and it can spit out the correct frequency. anyone know why this is happening?

Also what clock source is the pigpio library using? how do i switch clock source?

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