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XMEGA RC clock jitter
Hi guys, Do you know the jitter of internal RC 2 or 32 MHz clock generator? I need a generator with not very accurate frequency, but the period of the clock must be as stable as...
Sunday, 1 April 2012 - 18:34
DAC and DMA trigger problem
Hi, I'd like to use very simple configuration "“ wave table, which values are continuously transmitted to DAC, so I've wrote the following code: DMA.CTRL=DMA_ENABLE_bm; DMA....
Friday, 23 March 2012 - 21:13
Moving IVT to bootloader
Hi, I have some questions to which I cannot find any answers in official notes. XMEGA can move IVT to bootloader section by stetting of IVSEL bit. But, please tell me, the RESET...
Saturday, 3 March 2012 - 18:32
Optimization register Access (ATXMEGA)
The following code: PORTB_DIR=0x01; PORTB_OUT=0x01; PORTB_OUT=0x00; a=PORTB_IN; a= PORTB_IN; is translated as follows: PORTB_DIR=0x01; 244: 81 e0 ldi...
Sunday, 25 December 2011 - 11:32
Named address spaces – when available
Hi freaks :) I noticed that Georg-Johann Lay finally submit his patches for gcc, so now the vanila gcc should have support for __pgm and __pgmx, and 24-bit pointers and arithmetic...
Thursday, 15 December 2011 - 09:26
XMEGA, can UART override pin configuration
It is not obvious to me, when I enable UART transmitter it can override pin function, but according to manual the dedicated pin must be set to output. My question is, should I...
Tuesday, 15 November 2011 - 17:11
C++ and section attribute
Hello freaks, I have C++ specific question. In ordinary C, to specify the location of function one could specify: voif func()__attribute__ ((section (".bootloader"))); I can do...
Monday, 26 September 2011 - 16:18
RE: Re: RE: Re: WinAVR continuation
And please, remember about Bug c++/43745 "“ it is really annoying to have vtables in SRAM: http://gcc.gnu.org/bugzilla/show...
Thursday, 26 May 2011 - 16:56
CPU core clock change
In my circuit I have a separate clock generator, which I plan to use as CPU core clock. The problem is that by default my generator outputs 1MHz clock, which I would like to...
Thursday, 5 May 2011 - 21:03
New toollchain (gcc 4.5.1) and C++
Hi, Do anybody tried to compile any C++ program using a new toolchain? I tried my old ones, and they compiled fine, but after flashing a microcontroller don't work at all. Of...
Saturday, 26 March 2011 - 07:50
USART in synchronous mode
Hi, I'm trying to set a communication between two AVRs using synchronous USART mode. But unfortunately, this mode is very poorly described by Atmel's datasheets. As I can...
Sunday, 16 January 2011 - 00:04
warning: initialization discards qualifiers from pointer tar
Hi, I have a structure: typedef void (*menuitemfuncptr)(); struct _menuitem { const prog_char *text; menuitemfuncptr menuitemfunc; struct _menuitem *parent; struct _menuitem *...
Wednesday, 8 December 2010 - 18:27

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