Does anyone understand the UART connections on the DB101 board? There are 4 connections besides ground. RXH, TXH, RXL and TXL. So which ones do I use?
Atmel's doc8073.pdf "AVR481: DB101 Hardware User's Guide" contains this paragraph:
The level converted RxD and TxD lines are available on the header – the pins are marked with silkscreen labels RXL and TXL. The RS232 converted RxD and TxD signals are available on the same header, where the pins are marked with silkscreen labels RXH and TXH.
I suppose that would make it clear if I could speak Atmelese. :)
I also have the schematic, ATDB101_schematic_refE.pdf. but that makes me even more confused. Besides the level conversion stuff it has a chip described as "SPDT analog switch or 2:1 multiplexer" and a signal coming from the Atmega called RS-232_SEL. Is Rube Goldberg alive and well and living in Norway? :)
Supposedly this thing comes with a UART software module and a joystick menu to configure it. So if I could just figure out where to connect the wires from my PC I might be in business.
P.S. I just noticed something else. The joystick can't interrupt the AVR. It must be polled. The Butterfly does it better.