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Setting OSCCAL causes program to run amok
Dang, these AVRs are driving me crazy. So many "gotchas". I'm certain I've discovered another one that's going to make me feel sheepish once I discover the reason why. Here, I...
Sunday, 26 October 2008 - 15:59
Code works perfectly on 644p, but doesn't on 324p. Why?
I've got code that I developed on a ATmega 644p. It works as it should. (Although I might have a memory problem somewhere) When I compile it for the 324p, it doesn't work at all....
Friday, 24 October 2008 - 22:10
SPI causes TWI/I2C to lose arbitration
I've got a non-interrupt driven function that looks like this: uint8_t sd_raw_rec_byte() { /* send dummy data in order to receive some, as per SPI docs */ SPDR = 0xff...
Wednesday, 15 October 2008 - 13:06
Timer0 has lag when using an external clock signal
(I'm not sure if the problems are fatiguing or I'm just fatigued, after having pulled an all-nighter.) I have a GPS that's outputting a PPS to Timer0, i.e. PB0 on my Atmega644p. I...
Sunday, 17 August 2008 - 10:50
Fatiguing problem with SPI and I2C/TWI on same chip
I have an Atmel644p that is finally doing everything I want it to, except... something weird happens when I try to run everything at the same time. Specifically, I have a I2C...
Sunday, 17 August 2008 - 10:38
[TUT] [C] Getting SD/MMC card working painlessly with FatFS
NOTE: This thread is an evolving work. E L Chan continues to develop FatFs and this first post is based on his version back in 2008. It has changed a lot over the years. So yes,...
Thursday, 24 July 2008 - 15:30
ATmega 8515 drives pin low when 1 is written to port
SOLVED: The LEDs on an STK500 turn on when the pin is driven low (0V), which was counter to what I was expecting. Combine that with a bit of hamfisting on the voltmeter (1!=7), no...
Tuesday, 8 July 2008 - 20:20
How to do matrix mathematics on AVR
I've looked everywhere on the forum, but can't seem to find any examples of a generalized matrix mathematics, a.k.a. linear algebra, package that's adapted to AVR. In my normal C...
Wednesday, 11 June 2008 - 18:35
Looking for cheapest transceiver solution possible
I have a small project where I need to transmit data wirelessly for short distances (
Wednesday, 11 June 2008 - 11:35
Need help choosing a chip for logging application
I'm very new to AVRs and C in general, but I'm making good headway in a project necessary for my doctoral thesis. For my work on hybrid cars, I need to produce some data logging...
Wednesday, 4 June 2008 - 15:35

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