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Global variable problems
Hi guys   Sorry if this is just a tad basic, but whilst debugging my keyboard interface project I located a problem: I have very few global variables, but I noticed that when...
Sunday, 22 April 2018 - 13:19
ATmega 32U4 ISP programming
Has anyone else had any issues programming ATmega 32U4 AVRs with an AVR Dragon and Atmel Studio 6 and 7?   I keep getting the following error: "Failed to enter programming...
Monday, 9 April 2018 - 22:35
ATmega & USB guidance
Hi guys   I'm going to try and implement USB with my AVR based keyboard project so that I can connect the keyboard to a PC/Mac/etc.. Ideally, I'd like a little advice on...
Friday, 30 March 2018 - 08:03
DDR - discover by PORT
Hi guys   I'm writing a library and as part of that need to identify a DDR register based off a PORT set by the person using the library. I wrote the following as a test, but...
Wednesday, 28 March 2018 - 13:39
Problems passing char array to subroutine
Hi guys   Need a bit of help if at all possible.   I'm writing a keyboard scanning routine for an ATmega 324P written in C. All is working fine with an attached 44780...
Tuesday, 27 March 2018 - 10:23
Fuses for ATmega 168 for external crystal
Hi guys   I've been trying to set the fuses in an ATmega 168-20PU so that it uses a 20MHz external crystal (with 18pF caps).   So far I've managed to tank one of my '...
Wednesday, 28 February 2018 - 20:10
Displaying an image using ATmega 328P - reality check
Hi guys   I've embarked on first assembler project involving AVR assembly. I'm having fun so far, but have run into something I'd like some advice on if at all possible....
Wednesday, 21 February 2018 - 01:52
Copying a string causes instability
Hi guys   Can anyone see any problems with this code?  It causes the AVR I'm using (ATMEGA 238P-PU) to restart.   char keybuffer[15][35]; int keybufferpos = -1...
Thursday, 15 October 2015 - 20:25
Converting string to usnigned long for USART speed
Hi guys   I've been trying to implement a method for the user of my bus monitor project to be able to change the speed of the USART. atoi() works fine, but not above a...
Sunday, 11 October 2015 - 14:40
Disabling SPI in software (temporarily)
Hi guys   I've been trying to find a way of temporarily disabling SPI in at ATMEGA 328P-PU. What I want to do is have the AVR boot, disable SPI, do a level check on the SS (...
Sunday, 4 October 2015 - 11:09
Pointers and Flash RAM storage
Hi guys   My current project has a help system built in to it. This consists of a short description of each command that can be entered by RS232 (USART) session. I've quickly...
Friday, 2 October 2015 - 20:24
Using USART to wake ATMEAG 328P-PU from SleepMode
I'm working on a new version of my hardware bus monitor program which reads a 16 bit address bus, 8 bit data bus and 7 bit signals bus from an attached 65C02 board. My previous...
Tuesday, 29 September 2015 - 18:49

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