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STK with LCD Tutorial for learning assembly language for the
AVR-Single-Chip-Processors
(AT90S, ATmega and ATtiny) from ATMEL with practical examples.
The Single-Chip-processors of ATMEL are excellent for homebrewing every kind of processor-driven electronics. The only problem is that assembly has to be learned in order to program these devices. After having done these first steps the assembly language provides very fast, lean and effective code, by which every task can be accomodated. These pages are for beginners and help in learning the first steps.
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Index

Beginner's introduction to AVR assembler language. Also available as complete PDF-document for printing the whole course (Download, 1.1 MB) Four simple programming examples with extended comments as first steps of a practical introduction to assembler programming: Sense and requirements, Simple programming examples
A command line assembler with extended error checking and commenting, free for download For convenient operation of the command-line assembler: a window caller including editing the source and include files, viewing the list file, finding errors and editing erroneous lines, etc., for free download here
Binary multiplication, division, conversion of number formats and fixed decimals in detail, hardware multiplication Programming and testing of the hardware of the STK200-Board: EEPROM, external RAM, LCD-display, SIO-interface
Connecting a two-line-LCD with a four-line connection to the STK500 programming board with base routines for driving the LCD and a small clock application Converting an analog voltage to digital using the STK500 board, the on-board analog comparator and timer/counter 1 as pulse width generator
Connectinga 4*3 keypad to an AVR and sensing using Port connections or with a resistor matrix and an AD converter Converting a digital value to an analog voltage using a buffered R/2R network, including wave generation like sawtooth, triangle, sinewave forms and a small tone player application.
Software-Know-How, special assembler commands: LPM, stack jumps, macros Small applications: a DCF77 synchronized clock, a PCM-to-PWG-decoder, a terminal-controlled frequency generator, a digital signal generator with frequency/pulse-width adjust and LCD, an eggtimer as a gift, a steppermotor controller/driver
Accu loader applying an ATmega16 The whole webpage for download, ca. 2.9 MB packed, ca. 3.9 MB unpacked. After download unzip this file in a separate directory, keeping the pathes.
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New on this webpage

since:Description and linkSource code
25.05.2009New version 2.3 of the command line assembler gavrasm (free Assembler for Linux, Dos and Win, in german, englisch and french for 115 AVR device types), corrects two serious errors -
14.04.2009 Reworked the page on structuring source code, windows program for generating source code frame files with a standard design and all necessary sections header_tn13.asm
avr_head.zip
23.03.2009 Portuguese version of the beginner course in one pdf document-
10.01.2009Frequency counter with ATmega8, nine modes, LCD, 16 MHz xtal fcountV03
28.12.2008 Updated version of the beginner course in one pdf document-
23.12.2008New version 2.2 of the command line assembler gavrasm (free Assembler for Linux, Dos and Win, in german, englisch and french for 115 AVR device types) -
28.09.2008Added 16-by-24-bit hardware multiplication-
20.01.2008Hardware multiplication with ATmega-
28.06.2007Steppermotor controller/driver with an ATtiny13 stepper.asm
02.12.2006New version 2.1 of the command line assembler gavrasm (free Assembler for Linux, Dos and Win)-
05.11.2006An eggtimer with a ATtiny2313 as a gift eggtimer.asm
29.09.2006New version 2.0 of the command line assembler gavrasm (free Assembler for Linux, Dos and Win)-
13.08.2006New version 1.9 of the command line assembler gavrasm (free Assembler for Linux, Dos and Win)-
16.07.2006New version 1.8 of the command line assembler gavrasm (free Assembler for Linux, Dos and Win)
Persian version of the beginner's course on the new Download page
-
25.05.2006An adjustable digital signal generator with LCD Zipped
sources
04.05.2006New version 1.7 of gavrasm (free AVR assembler for download). Corrects a bug in the ELIF directive.-
17.04.2006Added a sitemap of the whole site-
17.04.2006Page on connecting a 4*3 keypad to an AVR-
28.12.2005New version 1.6 of gavrasm (free AVR assembler for download). Adds support for new CAN-, Tiny- and one new Mega-Type.-
27.09.2005New version 1.5 of gavrasm (free AVR assembler for download). Corrected two minor bugs. -
28.03.2005Accu cell loader hardware and assembler software applying an ATmega16 akkuload.asm
zipped
28.03.2005Added a description of advanced directives like conditional assembly and on left shift of port bits in the beginner course.-
27.03.2005New version 1.3 of gavrasm (free AVR assembler for download). Corrected false EEPROM capacity of two ATmega and added support for the new types ATmega 640, 1280, 1281, 2560 and 2561.-
08.03.2005New version 1.2 of gavrasm (free AVR assembler for download). Corrected some minor bugs and added support for the new types ATtiny25, 45 and 85.-
06.01.2005New version 1.1 of gavrasm (free AVR assembler for download). Corrected some minor bugs in the MACRO treatment, finally added support for the historic program counter PC. -
03.01.2005Applying an R/2R resistor network for Digital-to-Analog conversion and generating waveforms sawtooth1
sawtooth2
triangle
sinewave and
wavetable music
09.10.2004New version 1.0 of gavrasm (free AVR assembler for download. Added support for ATmega325 etc., an extra error file and others.
New version of the window caller, assimilated to gavrasm 1.0
-
28.03.2003gavrasm (Free AVR assembler) in improved version 0.9 for download. Added support for ATmega48/88/168 now.-
15.02.2004gavrasm (Free AVR assembler) in improved version 0.8 for download. Corrects some minor errors. Also, a new version of the convenient window caller for the command line assembler for free download. -
30.12.2003Beginner course as complete PDF file for download available-
20.10.2003gavrasm (Free AVR assembler) in improved version 0.7 for download. Corrects an error with AT90S1200, adds the new AVR type ATtiny2313, provides IFDEVICE directive for type-specific code.-
09.09.2003New version of the convenient window caller for the command line assembler, improved editor for include files, viewing the list file, error finder, etc. for free download here. -
03.09.2003gavrasm (Free AVR assembler) in improved version 0.6 for download. Corrects an error with negative numbers, adds several AVR types, provides nested IF/ELSE/ENDIF.-
26.08.2003Convenient window caller for the command line assembler, simple editor for the source file, viewing the list file, etc. for free download here. -
16.08.2003gavrasm (Free AVR assembler) in improved version 0.5 for download. Corrects an error in the instruction set of AT90S1200 in previous versions.-
21.07.2003gavrasm (Free AVR assembler) in improved version 0.4 for download. For convenient calling the assembler I have a window caller for free download.-
14.06.2003gavrasm (Free AVR assembler) in improved version 0.3 for download.-
31.05.2003gavrasm (Free AVR assembler) in improved version 0.2 for download-
17.05.2003Analog-to-Digital-Conversion using the analog comparator and timer/counter 1 of the AT90S8515 on board a STK500 ADC8.asm
09.05.2003Fixed decimal point numbers 8-Bit ADC
10-Bit ADC
24.12.2002Free AVR assembler for download -
14.09.2002 Introduction to Studio Version 4 -
23.08.2002 Hardware programming equipment for the beginner -
11.08.2002Creating tables in the program flash memory-
13.04.2002Connecting a 2-line-LCD to a STK500 port, with a date/time software clockLcd4IncE.asm
Lcd4IncCE.asm
02.02.2002All instructions and many terms in the assembler source files (HTML format) of the example pages are now linked to the description in the beginner course, so you can easily have more explanation on them.-
02.02.2002Added a page on assembler directives and expressions-
06.01.2002Added number format conversion tutorial and routines and restructured the calculation pages, removed several minor HTML syntax errors.CONVERT.asm
03.01.2002Renewed all assembler source files: commands in lower case letters to be more compatible with the editor from ATMEL (which still is not as advanced - compared to Tan's -, let me know if you need the Linux FPK or Win-Delphi Pascal sources for the self-written software if you have a similiar job to do), added a new index page to all source files source
file
index
16.12.2001Binary math
(multiplication and division)
MULT8E.asm
DIV8E.asm
01.12.2001Moved these pages from http://www.dg4fac.de to this new location at http://www.avr-asm-tutorial.net due to elevated traffic.-
10.07.2001Structure of asm source code8515STD.asm
24.09.2001Intro to the studio version 3.52-
12.08.2001Beginner's introduction to AVR assembler language-
14.01.2001DCF synchronised clock with serial interface in a 2313CLOCK.asm
Echoes serial characters back as hex, for the STK200 board SIOHEX.asm
23.12.2000Small application page -
PCM to Analogue Decoder for remote control systems PCM2PWG4.asm
Terminal controlled pulse generator PWGSIO2.asm
09.12.2000Examples for the use of macros in assembler language!TESTMAC1.asm
TESTMAC2.asm
TESTMAC3.asm
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Known and corrected bugs

DateFile(s)Error descriptionStatusThanks
10.01.2009keyboard.html Error in source code for keypadcorrectedCarl Rheinlaender
26.08.2007switch_schem.gif Akkuload-Analog schematic: Error in wiring of channel 3corrected Jonny Bijlsma
02.05.2005akkucalc.asm Akkuload: Caused by a serious bug in the calculation routine, the currents are by a factor of roughly two too small, and are displayed false.Corrected.Sebastian Mazur
06.01.2005gavrasm and
Pony-Prog
If you use gavrasm for assembling, and if you add more than one ORG directive within the code, and if you use Pony-Prog for burning the Hex- and Eep-files to the AVR, the shift in adress, caused by the ORG directive, is implemented in INTEL-Hex-format, but ignored by Pony-Prog. Be cautious when using more than one directive.Pending (Self)
01.10.2004CALC.html False description of the BLD and BST instructionCorrected Mark
05.12.2003Lcd4IncE
Lcd4IncCE
Bug in the LCD-Clock asm file prevented compilationCorrectedDan Carroll
05.07.2003FP_CONV10, HTML
.ASM
A missing code line caused calculation errorsCorrectedThilo
Mölls
24.12.2002exp2313.gifCorrected the pullup resistor in the experimental circuit, due to occasional reset problems reported, to a lower valueCorrected Andreas
Wander
24.12.2002(several)Corrected an error in the source code for the 4-Bit-LCD softwareCorrectedJan de
Jong
15.07.2002DIVISION.htmlElapsed processor time with wrong dimensionCorrectedArmin Kniesel
16.02.20028515STD.html
8515std.asm
Two int vectors missing!Corrected-
31.12.2001testsint.asm
sioint.asm
sioint.inc
bcdmath.inc
bcdmath.asm
The interrupt routine has a serious bug. The result is an unhandled interrupt, delaying execution of the program by approx. a factor of 30. As this routine requires external SRAM and so doesn't work with STK500, I removed these codes and will not provide a debugged routine instead. Removed(myself)
23.12.2001clock.gif
clock.pdf
RTS and CTS between the plug and the line driver were exchanged. The plug is to be connected to the PC using a crossed link for RD/TD and RTS/CTS. PB4 must be set to 0 to activate the CTS line.Corrected Wim
Korevaar
25.11.2001bcdmath.inc
sioint.inc
testsint.asm
Download of the inc-files results in an error message from the server. These files were renamed to .asm and the calling asm file corrected.CorrectedAxel
Rühl
24.09.2001(Several)Errors using .DEF and .EQUCorrected Stefan
Beyer
03.06.2001CLOCK.html
CLOCK.asm
When working with a DCF77 signal the seconds are incorrect (59.th second is already 0).Open!-
Error in the calculation of tens of monthes from the DCF77 signalsCorrectedThomas
Baumann
(Several)Some minor additions and changes in the text correctedFrank
Dalchow
TEST1.html
TEST1.asm
Some translation errors in the text correctedBrian
Tangney
02.12.2000TEST1.html
TEST1.asm
It was stated that the frequency of the LEDs is 800 kHz. In fact it is only 667 kHz!correctedTimo
Engelmann

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