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Discussion Title Created date
Port pin pull ups and logic gates.
Hello, I have looked at the Atmega640 manual and it states that each port pin has an internal pullup of about 20K. Does this provide enough current to connect to most logic types...
Saturday, 13 December 2008 - 21:00
Atmega640 counter control.
Hello, I have looked at the manual add I cannot see an easy way to do this. Is it possible to have the input to a counter enabled and disbled based on an I/P pin? eg.( Counts when...
Friday, 5 December 2008 - 00:17
ATmega128 "m128def.inc" question
Hi, I am writing a program in assembler using AVRstudio4. I have used .include "m128def.inc" to include the correct defs for the 128. When I run the assembler it does not find the...
Friday, 28 November 2008 - 21:43
SD interface?
Good morning, ( Here anyway ) Is there a freeware or commercially available suite for interfacing an SD card to ATM128? I need to move data to and from a PC to my project. Any...
Sunday, 16 November 2008 - 14:12
Firmware interrupts.
Good morning, ( Here anyways ) Is it possible to generate an interrupt from firmware without changing a pins level? INT0 in particular on a ATM128. Thanks, A
Thursday, 13 November 2008 - 12:10
Can this be resolved at compile time?? "sumof()?"
Hi, I need to calculate the total of a string of chars at compile time and store it in PROGMEM. Can this be done? Is there a lib function to accomplish this? The storage in...
Tuesday, 4 November 2008 - 14:05
ATmega128 eeprom question
Hello Can anyone tell me what values I can expect to find in the eeprom of an ATmega128 fresh out of the tube? I think recall reading threads that describe a problem with writing...
Tuesday, 28 October 2008 - 19:39
Help with encryption
Hi, This is not a GCC specific question but I thought this would be the best place to post. I need a self checking encyption method to use with AVR GCC. The the data to be...
Thursday, 23 October 2008 - 13:41
ATmega128 programming issue
Hello, I am using a SPI type programmer to program a ATmega128. The SPI is also used in the project under development. The difficulty is that after I program the device for the...
Sunday, 19 October 2008 - 17:14
Problems upgrading from 64 to 128
I am using AVR-GCC on a project ( with AVRstudio). I have no trouble compiling and testing my code when the O/P is selected for the ATmega640. When I change the define from...
Tuesday, 7 October 2008 - 14:09
"Location not valid"
Good morning ( In NA ), I have attached a short bit of code. When I load this in Studio 4 after compiling with GCC, the watch window reports "Location not valid" when I watch some...
Monday, 29 September 2008 - 13:46
Another optimization question
Hi, Does anyone know the particular compiler switch that reduces the typical _BV() manipulation of a port to the minimal asm instructions. The project that I am working requires...
Wednesday, 24 September 2008 - 22:57

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