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XMEGA A4 vs A4U
Just a container to indicate the difference between these two families. Please add any other difference, I'm sure I will be missing some. Features added to the A4U: 1) USB Module...
Friday, 26 August 2011 - 17:59
Checking assembly listing, why call main ?
I am checking the assembly listing of my C program and I noticed that there is a call to main. Why doesn't the compiler just do a jump to main? This looks like a waste of stack...
Tuesday, 2 August 2011 - 04:37
Simple C code inefficient and working
I have the simplest code to average two 8bit signed numbers, but it is not working, temp1 and temp3 are declared as uin8_t: temp1=(uint8_t)((temp1-0x80)>>1)+(((uint8_t)temp3-...
Friday, 29 July 2011 - 01:40
ADD with Saturation [need inline Asm help]
I'm looking to optimize this function: // Add signed to unsigned using saturation, return unsigned uint8_t addwsat(uint8_t a, int8_t b) { if(b>=0) { if(a>255-b)...
Sunday, 10 July 2011 - 16:08
Trying to use 100% of flash
ATXMEGA32A4 Flash: 32KB + 4KB for Boot I have the bootloader working, it uses around 3KB. My main application is very large and doesn't fit with the bootloader, so I'm trying to...
Monday, 4 April 2011 - 06:26
USB to TTL cable
I am looking for a USB to TTL cable (the ones with an embedded FTDI or Prolific IC), but with some special requirements: 1) One end is the standard USB "A" connector, to plug on a...
Friday, 4 March 2011 - 15:29
Happy to see an XMEGA forum
:) Thanks
Friday, 4 March 2011 - 14:14
Inline assembly to use FMUL
So far, I have been calling an assembly function to use the FMUL instruction: ; 1:7 Fixed Point Multiplication .global fmuls_8 .func fmuls_8 fmuls_8: push r23 mov r23,...
Friday, 4 February 2011 - 19:28
Xprotolab - Miniature Oscilloscope and Waveform Generator
Here is my latest AVR Project, it is the result of years of work derived from my previous projects. It is built around the ATXmega32A4, it is a kind of project that could only...
Sunday, 9 January 2011 - 20:56
[solved] XMEGA ADC with DMA problem
I am configuring 2 DMA channels to acquire data from 2 ADC channels. I am using the ADC in signed mode. Data from ADCA.CH0 looks ok, but with ADCA.CH1, the sign bit is lost,...
Thursday, 6 January 2011 - 07:54
How will an SD card fail?
After a lot of use, how will an SD card fail? This last week, I had an SD card that simply stopped working. And another SD card which I copied one file from, the file had some...
Tuesday, 21 December 2010 - 21:55
XMEGA ASF driver bug ? and suggestions
Not sure if this is the best place to post this, but I think I found a bug in a driver file: ac_driver.c, line 182: ((scaleFactor << AC_SCALEFAC_bp) & AC_SCALEFAC_gm);...
Saturday, 4 December 2010 - 02:20

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