Legal Removal Request

Post: OK thank you. I've spent a bit more time on it so I've got a clear set of repeatable steps and here they are. I've got the IOPI plugged into a Pi Zero and I have absolutely nothing connected to the IOPI. I run the demo_ioread.py script from your examples and I can see that all the pins 1-16 are set high (because the pullups are enabled). I can move a jumper connected to ground along the pins, and I can see each switching to low as I do. This is behaving exactly as I expect it to do. Moving onto the CLI utility, with absolutely nothing plugged into the IOPI this is the output I'm getting: [pre][code]pi@raspberrypi:~/iopi/cli/ABElectronics_CLI/iopi_c $ ./iopi -a 0x20 -p 0 -r -b 0b11111111 pi@raspberrypi:~/iopi/cli/ABElectronics_CLI/iopi_c $ ./iopi -a 0x20 -p 1 -r -b 0b11111111[/code][/pre] So, again, everything working as it should. I then connect pin 1 to ground and: [pre][code]pi@raspberrypi:~/iopi/cli/ABElectronics_CLI/iopi_c $ ./iopi -a 0x20 -p 0 -r -b 0b11111110 pi@raspberrypi:~/iopi/cli/ABElectronics_CLI/iopi_c $ ./iopi -a 0x20 -p 1 -r -b 0b11111111[/code][/pre] So that's doing exactly what I expect as well. And if I disconnect pin 1 from ground, it reverts to the correct expected output of 0x11111111. Here's where it goes funny (or where I've messed it up). I now run these two commands to enable the invert so I can ultimately get a 1 when the pin is grounded and a 0 when not: [pre][code]pi@raspberrypi:~/iopi/cli/ABElectronics_CLI/iopi_c $ ./iopi -a 0x20 -p 0 -i 1 pi@raspberrypi:~/iopi/cli/ABElectronics_CLI/iopi_c $ ./iopi -a 0x20 -p 1 -i 1[/code][/pre] I now read both ports with nothing connected: [pre][code]pi@raspberrypi:~/iopi/cli/ABElectronics_CLI/iopi_c $ ./iopi -a 0x20 -p 0 -r -b 0b11111110 pi@raspberrypi:~/iopi/cli/ABElectronics_CLI/iopi_c $ ./iopi -a 0x20 -p 0 -r -b 0b11111111[/code][/pre] For me both commands should be giving me 0x00000000 but they aren't. After a bit of tinkering around I realised that if I connect pin 1 to ground and repeat: [pre][code]pi@raspberrypi:~/iopi/cli/ABElectronics_CLI/iopi_c $ ./iopi -a 0x20 -p 0 -r -b 0b11111111[/code][/pre] So to cut a long story short, it seems to me that when I'm asking the CLI to invert the port (ie invert all the pins on the port), it's only inverting the first pin. Hope that makes sense, sorry for the long winded post. Is it me that's using it wrong? Thank you.