PicoMite VGA

Author	Message
Mixtel90 Guru Joined: 05/10/2019 Location: United Kingdom Posts: 8964	Posted: 07:51am 27 Sep 2022       The RC2040 book isn't clear about how to do open drain outputs. It looks like it's possible, but it's a combination of two or three register settings. I was expecting a simple register change but no such luck. If you only need a single pin there's a work-around, I think. SETPIN mypin, DOUT pin(mypin)=0 Now, to set pin low SETPIN mypin, DOUT or to set it high impedance SETPIN mypin, DIN EDIT Found this:   Quote   Edit: Having a closer look at the datasheet, it might be possible after all. The GPIOn_CTRL registers allow to set control of output signal and output enable from the currently selected function independently. That means we should be able to drive outputs open-drain if we set OEOVER (output enable) to 0x1 (inverting) and OUTOVER (output signal) to 0x2 (drive output low). I still have to test and verify that, but it looks promising! Edited 2022-09-27 17:54 by Mixtel90