Post Created date
triggered DMA on Xmega
There may be a typo there in the code (or bug). The addrctl should be 0x95, source reload after each burst and increment after each byte. Although in burst mode I think it...
Monday, 29 March 2010 - 14:35
triggered DMA on Xmega
This is from one of the Boston Android example programs ( for our Xmega EVAL-USB boards (
Monday, 29 March 2010 - 11:46
Yeah, in the simulation I ran it did that but I chalked it up to something wrong with my implementation, but interestingly if I run TCC0 and trigger the DMA transfer off of that...
Thursday, 28 January 2010 - 21:16
For 16 bit transfers I think you need to configure the ADDRCTL like this: DMA.CH0.ADDRCTRL = DMA_CH_SRCRELOAD0_bm | DMA_CH_SRCDIR_INC_gc | DMA_CH_DESTRELOAD_BURST_gc |...
Wednesday, 27 January 2010 - 17:24
They put so many configuration options into the Xmegas for the DMA; it's a bit tricky to get them all right. I always use the AVRstudio simulator and/or JTAG debugger with the...
Wednesday, 27 January 2010 - 01:53
Default state for unconnected pins and IO pins
As far as I am aware, all GPIOs on AVRs default to high impedance inputs which is a fairly safe state(i.e. DDRX = 0). If you want to explicitly set the state of a GPIO to be safe...
Thursday, 21 January 2010 - 22:46
U.S. Supplier of ATxmega128A3 Crumb Module
Boston Android has a bunch of Xmega development boards with the atxmega64a3, 128a3 and 32a4 parts. -Paul
Wednesday, 20 January 2010 - 16:29
How to send a float via UART on XMEGA?
You mean you want to change the function to put a(float) in the TX buffer instead of (uint8_t)? -Paul
Tuesday, 12 January 2010 - 19:19
XMEGA ADC Problems
Okay. I've been able to fix the accuracy of the ADC on the Atxmega128A3 and ATxmega64a3. Turns out you can't set AREF > AVCC-0.6V. So for AVCC=3.3V you have to keep the external...
Tuesday, 12 January 2010 - 15:36
XMEGA ADC Problems
I've read most the the posts on the Xmega ADC issues and with the setting everyone is recommending (differential, signed, PORTA:0 external reference, 64+ prescaler) and I see the...
Sunday, 10 January 2010 - 04:14
Who have ATXMEGA64A4-AU Sample?
The only real difference between the A4, A3 and A1 families is what peripherals are enabled and the number of gpio ports. The names and functionality are identical as far as I can...
Saturday, 19 December 2009 - 02:51
New xmega Bootloader (App Note AVR1605) - Port to GCC
bpaddock wrote:js wrote:Quote: So it may be good to try to push the usart bridge to run a little faster for bootloading purposes?There is no gain if the memory write time is the...
Tuesday, 8 December 2009 - 17:37