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Using a timer overflow as a trigger for DMA transfers
Context: classic waveform generation setup... Waveform is in a 128 words (256 bytes) buffer. DMA source : buffer DMA address control source : reload at each block ; increment DMA...
Tue. Jan 31, 2012 - 01:12 AM
XMega parts availability
Hi all, Is there any information (official from Atmel or from discussion you had with sales reps) about the roadmap for the production of XMega chips? I have a project which...
Thu. Nov 24, 2011 - 11:33 PM
XMega DMA for background USART and SPI writes
I'm in the middle of porting, from ATMega to XMega, a project which makes use of UARTs (TX and RX) and SPI (slave to another device, master of a DAC), and I've decided to take...
Mon. Nov 21, 2011 - 12:28 PM
Designing with the ADC bugs in mind: am I getting it right?
I am working on a new design using an XMega128A3 and am trying to get my head around all the constraints introduced by the ADC bugs / limitations. My device needs to read 12 front...
Mon. Sep 5, 2011 - 09:34 AM
Polling the UART from a timer interrupt?
My ATMega644p project is currently using two interrupt service routines: - A timer interrupt at F_CPU / 512 (39 kHz), which is writing audio data to a DAC. - A data reception...
Wed. Aug 17, 2011 - 10:58 AM
Maximum SPI communication speed.
I'm working on a SPI communications setup with a 328p as master and another 328p as a slave, clocked at the same speed. The communication between the chips is bursty - there's a 2...
Mon. Jul 11, 2011 - 09:46 PM
SPI questions
Hi all, I have two questions related to using SPI with 6 slaves (master is ATMega644, slaves are Microchip DACs) : - Is there any particular precaution to take given the large...
Fri. Apr 15, 2011 - 06:27 PM
Yet another synth project
Hi all, I've completed my second AVR-based synth, this time with an ATMega644p. I had developed previously a similar device - but since this was my first short at electronics/...
Mon. Aug 16, 2010 - 01:03 PM
Using I2C and parallel port output simultaneously
Hi, On an ATMega644p, I'd like to make the following use of PORTC: - Pins 22/23: I2C device - Pins 24/25: simple I/O - Pins 26/29: 4-bits parallel bus The code that writes the...
Wed. Jun 23, 2010 - 12:49 AM
Differences between ATMega1284p and ATMega644p?
I am trying to run on a 1284p a piece of code that has been consistently running fine on a 644p (for the moment not taking advantage of the extra memory ; and no plan to use...
Thu. May 27, 2010 - 02:11 AM
GNU toolchain support for the 1284p
Hi, I'd like to know a bit more about the way the gnu toolchain supports the 64-128k range on the 1284p. I have two concerns: - function pointers are stored as 16 bits addresses,...
Fri. May 14, 2010 - 09:42 AM
74hc165 weak output? < solved >
Hi, I am breadboarding the controller part of a project for which I need to read 8 switches. They are pulled-up to Vcc through a resistor network, sent to the parallel inputs of a...
Sat. Mar 13, 2010 - 10:05 AM

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