Thanks Clemens. I found that the F5xxx 6xxx Driver Library Users Guide is WRONG on page 204 and 206 and the "GPIO_setASPeripheralModuleFunctionInputPin" ...or OutputPin " IS supported" on the F5xxx . This wrong documentation is what confused me. I was thinking of changing the Output to an Input when I want to switch from High Out to High Impedance Out. Thanks for confirming this is the only way this can be done. Thanks, Lorne
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