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Serial bus integration
I'd like to use an at90usb162 that has a four-wire SPI interface (SS, SCK, MOSI, MISO) to drive another chip. But the other chip supports a three-wire interface that looks like...
Monday, 4 June 2007 - 22:59
Output pin fall times
I am experimenting with an at90usb162 on a stk256 board. While setting an output pin high and low in a loop, I noticed that the fall times are about 700us and vary by about 40us (...
Saturday, 2 June 2007 - 06:59
Two banks failing
I'm playing with the usb generic hid example code on an at90usb162 (stk256 board). Unmodified, the example code creates three endpoints; IN, OUT, and Control. IN and OUT are each...
Monday, 21 May 2007 - 07:09
Interrupts and registers
How does avr-gcc ensure that registers are not clobbered during interrupts? I'm not asking about problems related to C variables not marked volatile. I'm interested in how the...
Friday, 18 May 2007 - 07:02
Debugging questions (mostly)
I am an experienced software developer, but about a week into the embedded world. I've been doing a lot of reading to prepare for a project based on an AVR 8-bit uC with USB (very...
Tuesday, 8 May 2007 - 04:33