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how does Atmel test AVRs?
Does anyone know the details of how AVRs are tested at manufacturing? I'm asking because I've had 2 Attiny88-au chips where the internal pullups on PA0, PA1, and PC7 aren't...
Thursday, 7 August 2014 - 19:18
flaked out avr?
I have an AVR (tiny88) behaving quite strange. It's not dead, but it's not working properly either. It's a -au on a qfp-32 to dip board, and running a basic blink program....
Thursday, 31 July 2014 - 23:48
undocumented fuse bits
I've noticed some AVRs have undocumented fuse bits. For example on a tiny88, the default efuse is 0x07, while table 20-3 in the datasheet says the default is 0xFF, with SELFPRGEN...
Thursday, 31 July 2014 - 13:56
Testing 433Mhz RF antennas with RTL-SDR
Synopsis: half-wave dipole antenna gives ~10dB better performance than a quarter-wave monopole. http://nerdralph.blogspot.com/20...
Wednesday, 16 July 2014 - 06:03
code to control a HD44780 LCD display
I've just finished some new code for 2-line HD44780 LCD displays like the 8x2, 16x2 and 20x2 modules. http://nerdralph.blogspot.ca/201... One thing my code has that I haven't seen...
Tuesday, 15 July 2014 - 18:00
useless Atmel support
At the suggestion of people on AVRfreaks, I started submitting avr-gcc & avr-libc bugs to atmel support, despite my belief that it would be a waste of time. Jeorg may be...
Monday, 14 July 2014 - 10:24
interrupt on 2 lines going low?
V-usb doesn't have a 8Mhz version, and the code size is rather large, so I'm writing a small 8Mhz USB implementation. One of the things I'm doing to simplify the code is doing the...
Monday, 14 April 2014 - 17:40
ok to use -mmcu=attiny84 instead of 84a?
I'm trying to use fuse.h to define fuse settings in my elf files. I noticed the fuse definitions for the 84a are not correct (and submitted avr-libc bug #42084). The signature...
Thursday, 10 April 2014 - 01:22
sample avr makefile
Here's a basic makefile I wrote for avr work. DEVICE = attiny85 # or export DEVICE=atxxxx in shell # export TARGET=app CC = avr-gcc CFLAGS = -mmcu=$(DEVICE) CFLAGS += -Os all...
Sunday, 30 March 2014 - 17:47
problem with ATtiny85 timer1 code
I'm trying to use timer1 in normal mode, counting up to 2, and toggling OC1A each time the counter value is 1. When my code runs, PB1 (pin 6) just stays low all the time. I've...
Sunday, 30 March 2014 - 04:50
433Mhz range
I have a 433Mhz wireless receiver/xmitter pair that I got from DX, and intended to use for sending data from an AVR to a PC with the receiver hooked up to a USB-TTL module. I...
Friday, 28 March 2014 - 06:07
Cheap USBAsp
Just ordered 5 of them for US$10.63 on a one-day sale (15% off from $2.50). I have one of LCsoft's original version (with the on-board 3.3v regulator), which has worked well....
Wednesday, 26 March 2014 - 04:24

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