Site Updates
The reorg is well under way. Some of you may experience issues with the rendering. All I can say is, “get a better browser!” In general, I’m using Safari, and only occaisionally testing on IE/Mac 5.2. Windows users, well you can just fend for yourself. Sorry!
Added Wheel Encoders & MMC
Got the second wheel encoder hooked up, and replaced the other wheel. I also hooked up the MMC, but for whatever reason have not been able to get the serial communication between it and the ’32. I can see the pulse train on the ’scope, but the MMC fails to recognize the transmission.
LCD Works!
Outstanding success! I figured out the problems I was having getting PORTC’s pins to Respect My Authoritaaa…
Turns out that JTAG is enabled by default on this device, and for some reason disabling JTAG internally didn’t work. I tried writing the bit by assigning it twice in succession in gcc. Instead, I changed the fuses to disable JTAG, and that cleared up the problem.
An interesting side note about how I realized it was the JTAG settings getting in the way: I was thinking that perhaps some alternate function of the PORTC pins might be getting in way, but it didn’t dawn on me which function until I ran a simple sequential count on the pins in fairly rapid succession, using the STK500 LEDs to show the output. Lo and behold, only the least- and most-significant two bits changed state. Checking the docs, sure enough, the remaining bits were all dedicated to JTAG.
