I have made an usb key board with a ft232RL and a tiny2313. the keyboard works well after programming. but when I cycle power at the keyboard it will not work any more.
I have done some testing to find the problem and it looks like that the software is running in the tiny. I see it scanning the keyboard(portb) but there changes nothing at portd when I press a key. I have also tested the principle without the tiny. It then works but then I can only use four keys. The tiny does some multiplexing for the keyboard. I am also not using the usart on both of the chips. all goes by bitlogic.
I do want to program the chip everytime I want to work with the keyboard