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extra control with SPI?
I am using SPI communications with a single master and multiple slaves, but it turns out that there are certain periods when the slave must NOT accept communications due to...
Thursday, 18 February 2010 - 02:13
using other ports for SPI SS#?
Application Note AVR151 says that the number "of slaves which can be connected to this AVR is only limited by the number of I/O pins to generate the slave select signals." However...
Friday, 5 February 2010 - 19:49
reset vs. power-off with PS2 controller?
My current project includes a mega644 SPI master and a Playstation2 (PS2) controller as SPI slave. My programmer/debugger is JTAGICE mkII. When I reprogram the device and come...
Wednesday, 3 February 2010 - 20:24
using pin/port name as a function parameter?
In all my past designs, pins and ports were hardcoded using #defines. But now I'd like to pass a pin or port as a parameter to a function... and I can't figure out what the...
Thursday, 21 January 2010 - 17:57
common oscillator for several MCUs?
I'm working on a design with 5 ATmega644 MCUs on small plug-in boards connected through a short backplane. With a goal of making these boards as small as possible, I'm wondering...
Thursday, 21 January 2010 - 14:35
multiple SPI clock rates?
First of all, HAPPY NEW YEAR to all the helpful 'Freaks out there who've advised me so well in the past year! You all are indispensable to guys like me to are just learning our...
Friday, 1 January 2010 - 17:41
getting avrfix to work in AVR Studio?
I am trying to use the fixed-point math library avrfix in a test project under AVR Studio and am having trouble. As soon as I add a variable of type _Accum to my obligatory...
Sunday, 13 December 2009 - 22:55
Is 20MHz a lie?
I just read a thread here about overclocking and am a little irritated... I cannot even get my AVRs to work to specifications. Namely, every datasheet I've seen for AVRs has...
Sunday, 13 December 2009 - 16:24
SPI with many devices?
I am designing a system that will have one master and five slaves on SPI. I've seen articles about pullups and pulldowns on the various SPI lines, but am unsure about how to go...
Friday, 11 December 2009 - 17:53
weird JTAG results
I am prototyping a breakout board with an onboard JTAG connector and a mega644. I am programming using a Dragon from within AVR Studio. My prototype has, of course, a single...
Wednesday, 25 November 2009 - 21:24
problem with progmem
I've tried many combinations and am now confused... I have a display function that writes a string to the TTY using the UART, and its signature is: void tty_string(const char *s...
Saturday, 7 November 2009 - 18:27
creating a PCMCIA memory card driver
I am trying to create a a driver (for a PC Card (PCMCIA) memory card) capable of reading and writing within the first 256 bytes. This limitation is just so I can use one 8-bit...
Monday, 2 November 2009 - 16:40

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