I have a normal DELL usb keyboard, and as part of a setup I am making with my Mac, I want to convert it to a USB-C keyboard. Currently I have found an old USB 3.0 - USB-C 3.0 cable and chopped it in half, then I have wired the red to red, green to green, white to white and black to black. This however doesn't work when I connect it to my PC. When I use the cable like normal just wiring only those four colours, (the others are still disconnected) and connect it with the USB A side to my computer and the USB-C to my kindle, it works and I can access it's files which leads me to believe there may be something with data transfer using different cables for different ways, which makes no sense... Anyone got any ideas?