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Where's the DFU bootloader?
I don't see this anywhere in ASF. I'm using Atmel Studio 6 and I've got ASF 2.11.1 thru 3.4.1. A prebuilt hex file (for the ATxmega64A4U) would be a good start, but ultimately I...
Thursday, 25 April 2013 - 04:00
Simulating a USB hub
Has anyone ever tried to get an AVR CPU to mimic the action of a hub with more than one downstream device connected to it? The downstream devices wouldn't actually be separate...
Thursday, 31 January 2013 - 06:03
Trying to use external crystal
I'm using a 128A1U with an external 16MHz rock, debugging via JTAG. The oscillator isn't starting up. At the start of main() I call osc_enable(OSC_ID_XOSC), and it compiles into...
Monday, 3 December 2012 - 06:34
A1U EBI seems like it's not there
I'm trying to use the EBI in 2-port LPC SRAM mode, but it ain't working at all. Not only am I not seeing any activity on the pins, I don't even see anything in the EBI programming...
Sunday, 2 December 2012 - 20:05
.BOOT overlapping flash image of .data
I'm trying to link a simple XMEGA bootloader, so I positioned .text at 0x10000 (a byte address, for the 64A1U). The linker barfs, with the following message: section .BOOT...
Thursday, 4 October 2012 - 05:22
I think I need AVR GCC 4.7
Atmel Studio 6 comes with GCC 4.6.2. It isn't obeying the __attribute__((__aligned__(4))) attribute, which is used in asf\xmega\drivers\usb\usb_device.c because the USB EPPTR...
Friday, 21 September 2012 - 00:10
How does double buffering work?
The docs don't actually explain how this is used, as far as I can see. Obviously, the DBUFMODE field in the DMA.CTRL register has to be set to pair up the channels. But then what...
Wednesday, 19 September 2012 - 00:33
How does DMA reloading really work?
The AVR XMEGA AU Manual clearly says that as DMA progresses, the TRFCNT register counts down, and the SRCADDR or DESTADDR register increments or decrements if so programmed. It...
Tuesday, 18 September 2012 - 23:33
CDC using zero length packet instead of NAK
I've compiled the CDC example for the A3BU Xplained board, and I'm sniffing the USB with a Beagle. When it's idle, I'm seeing the host initiate an In transaction every frame, as I...
Monday, 17 September 2012 - 07:04
How to choose components of ASF?
This is a more general restatement of my question in the "Using USB common stuff" thread. Other than using ASFWizard, choosing from the limited set of modules there, and then...
Saturday, 8 September 2012 - 22:20
Using USB common stuff
Just to get up to speed on the tools, I tried the USB Device CDC example project on the A3BU Xplained board. Now I want to rip out the CDC stuff, and stick in my own MIDI class...
Saturday, 8 September 2012 - 17:13
I/O on external bus
I'm looking at an 128A1U part for a new design, and need a whole lot of random I/O, more than there are ports for, so I'll need to extend it via the external bus. I'd still like...
Wednesday, 11 April 2012 - 05:39