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Discussion Title Created date
IO port transitions
Using an AT90USB162 I need to switch some I/O ports back and forth between input and output. Section 11.2.3 of the datasheet is called "Switching Between Input and Output" and...
Thursday, 27 March 2008 - 23:43
Testing sensitive circuit
I have a CMOS IC that is 3.3v with an absolute max rating of 3.9v. Once its on my pcb I want to test the circuits to make sure none are shorted to ground. But I noticed that my...
Monday, 24 March 2008 - 21:57
Alternate gcc build scripts
I recently needed to rebuild the gnu avr toolchain, and during the process updated the build scripts attached to the sticky thread in this forum. My main goals were to make is...
Sunday, 23 March 2008 - 03:43
Another asm question (lpm)
I have C code that looks something like this: static const PROGMEM byte progdata[6] = {0x55, 0x3E, 0xBB, 0x21, 0x92, 0x02}; static byte testarray[6]; void testpgm() {...
Wednesday, 12 March 2008 - 20:12
asm brne question
So I'm trying to port some code written for the Atmel assembler to gcc/binutils. My last error is this code: brne PC+2 The binutils assembler doesn't know "PC". There is...
Wednesday, 12 March 2008 - 02:08
Locating a progmem block
Using avr-gcc and avr-ld is it possible to control the address of a block within flash? I'm testing something written using the Atmel assembler and it does something like: .ORG...
Tuesday, 11 March 2008 - 22:38
Best place to store a secret key
On a standard (non-secure) AVR is there any location that would be safer than others to store secret keys? For example, is eeprom better or worse than flash? Would it help to...
Saturday, 8 March 2008 - 08:21
AVR3.5 (AT90USB162)
I've been reading release notes trying to figure out if the AVR3.5 MUL fix has been release in avr-libc and gcc yet. I know the WinAVR binaries have the patches, but I'm building...
Thursday, 28 February 2008 - 01:16
Plugged vias in SMD pads
I am having a board made and talking with pcbcart about plugged vias. They've tried to help me, but I'm still not really clear on what is possible or normal. I have several QFN/...
Friday, 22 February 2008 - 20:13
Want a dataflash tester?
To test the AT45xxx Series Dataflash devices (along with SMT soldering) I designed the simple boards shown below. I ordered 5 pcbs but pcbcart sent me 28 of them, so I have a few...
Wednesday, 20 February 2008 - 23:14
Soldering iron temperature
I'd like to validate the temperature adjustment on a new soldering iron I recently purchased. I have an IR temp gun, but it doesn't work well on the small tip of the iron. My...
Wednesday, 20 February 2008 - 22:36
My first 0402 reflow
Here are some pics of my first attempt at assembling a surface mount board using reflow. The board has only 5 components, but the passives are 0402 and the IC is an 8-contact 6mm...
Wednesday, 13 February 2008 - 07:13

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