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1284P Xplained CPU Clock and I/O Clock
I'm working with a Mega-1284P xplained board. I'm using Atmel studio 7 and an example project.   avr_compiler.h is included and it has this snippet: #ifndef F_CPU /*! \brief...
Wednesday, 27 December 2017 - 22:04
AVR stops when usbasp not connected
I have a ATmega644P on a breadboard powered by a 5VDC LM2940 which is fed by a 9VDC wall wart. Output of my voltage regulator is a solid +5VDC. The usbasp is connected to the PC...
Sunday, 28 February 2016 - 21:45
DAC Waveform distortion
I am using a TLC5615 DAC connected to a ATmega644P via SPI. There is also a EEPROM and the usbasp on the SPI bus. I have a waveform table with 64 entries I am using to generate a...
Tuesday, 23 February 2016 - 02:35
Has power for my ATmega644P caused a chip failure?
I recently had my ATmega644P fail on the breadboard. It had only been operating there for a month of periodic work.   I'm powering the project with a 300W computer power...
Thursday, 28 January 2016 - 19:31
HD44780 LCD garbage
I'm using a HD44780 4x20 LCD connected in a 4-wire configuration, with a ATmega644P  compiling with AVRDUDE, usbasp programmer. Every time I flash code to the AVR the LCD...
Thursday, 21 January 2016 - 22:00
globals and interrrupts
So of course using global variables is frowned upon for many reasons. But when a function is called by an ISR vector from another module that isn't in the scope of the ISR is it...
Saturday, 26 December 2015 - 16:18
Rotary encoder works too good
I'm using an Alps rotary encoder that has 4 state changes in between detents, with an ATMega644P and the shown interrupt routine that I obtained from this site in a thread I am...
Saturday, 12 December 2015 - 16:37
For loop not ending
I'm working with a ATMega644P, avrdude from the command line with a Makefile and text editor. Inside a switch statement I have two cases each containing for loops:   //......
Wednesday, 2 December 2015 - 14:00