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Critique my oscilloscope schematic
Hi! I have updated my new Xprotolab-Portable Schematics to include ESD protection. Please check it out and send me any other suggestions.
Sunday, 21 October 2012 - 23:12
Frequency counter
I have implemented app note AVR1617 on the XMEGA. It works great, but I see the measurement jump up and down a little bit, maybe around 50ppm. For example, if measuring 8MHz, the...
Tuesday, 25 September 2012 - 18:58
Flip - Exception Stack
How to fix this? It only happens when I press "Select CONFIGURATION". I tried two different computers, one with Windows XP, the other with Windows 7. I can program the Flash and...
Tuesday, 18 September 2012 - 19:40
32-bit Input capture compensation clarification
Quote:14.7.4 32-bit Input Capture Two timer/counters can be used together to enable true 32-bit input capture. In a typical 32-bit input capture setup, the overflow event of the...
Friday, 31 August 2012 - 16:07
Omitting units in schematics
In my schematics I omit the component units because they are implicit with the symbol drawing. But why do most people omit the Ohms units in resistors, but do include the units...
Saturday, 25 August 2012 - 23:52
Didn't work without function prototype [solved]
Just a note to myself. I spent a few hours trying to figure out why my code didn't work. It turns out that I was calling a function from another file, within a file that had no...
Monday, 23 July 2012 - 07:35
Any WINUSB expert around?
I am using WINUSB for my oscilloscope devices. The driver works ok on my Win7 64bit computer. But some users with Win7 64 bit are saying that they get an error "the parameter is...
Thursday, 19 July 2012 - 18:55
A simple USB question: bulk transfers
I have the important part of my USB transfers working. I normally transmit 768 bytes with just a few lines of code, by using the "Multipacket Transfer" of the XMEGA: endpoints[1...
Monday, 9 July 2012 - 17:49
Wrong value written to variable [solved]
Compiler version 4.6.2. u8CursorX is a global variable, the bug occurs regardless if it is volatile or not. u8CursorX=63; 00001659 STS 0x2552,R12 Store direct to data space...
Sunday, 8 July 2012 - 20:16
JTAGICE mkII hangs while programming
Atmel Studio 6, Windows 7 64bit, XMEGA32A4U. My debugger occasionally hangs when starting a debugging session, it seems to hang when it is in the middle of programming. I need to...
Thursday, 5 July 2012 - 14:08
USB: STALL unsupported requests
When receiving an unsupported control request, I set the STALL bit on the endpoint's CTRL register, and prepare the IN endpoint for the next transaction. But the USB module doesn'...
Monday, 28 May 2012 - 20:58
How to align data to a 16-bit word
The EPPTR register of the XMEGA USB module needs to point to a 16-bit word aligned table. So I tried this: USB_EP_pair_t endpoints[USB_MAXEP+1] __attribute__ ((aligned(2)));...
Saturday, 19 May 2012 - 05:50

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