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Category Archives: avr
Modify Arduino Optimization Levels on the Fly
Do you know and understand how compiler optimization is altering your code? Higher optimization levels can reveal problems in some programs that are not apparent at lower optimization levels. Volatility One method to prevent optimization issues with variables is to … Continue reading
Using ATMEL Studio 7 for Arduino Development
While installing ATMEL Studio 7 (AS7) is not required in order to learn inline assembly language programming, it has worthwhile advantages. The ability to compile code for the Arduino, run it inside the included Simulator and immediately debug it will … Continue reading
My Cup Overflows
When performing math (even basic addition and subtraction) with signed numbers an overflow problem sometimes arises. The Arduino microcontroller indicates the existence of an overflow error by setting the overflow flag in the SREG. Here’s a demonstration of the overflow … Continue reading
Posted in arduino, assembly language, avr, avr inline assenbly
Tagged arduino, asm, assembler, assembly, avr, inline
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Arduino Inline Assembly Port & Pin Compendium
The following is a compendium of inline assembly functions dealing with ports and pins. Use these at your own risk. These functions have been trimmed of most bounds checking, so they can easily be abused. The Arduino Inline Assembly Tutorial … Continue reading
Arduino Inline Assembly Tutorial (Examples)
As the final tutorial in this series, we present four example inline assembly functions for the arduino. Specifically, these cover the conversion of a byte to a hexadecimal string, SPI Mode 0 hardware transfer, SPI Mode 0 Bit-banging, and the … Continue reading
Posted in arduino, assembly language, avr, avr inline assenbly
Tagged arduino, asm, assembler, assembly, avr, inline
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Arduino Inline Assembly Tutorial (Interrupts)
Pardon The Interruption The previous tutorial covered the basics of writing inline functions. A close relative of the function is the Interrupt Service Routine (ISR), which is the topic here. Portions of this tutorial may pertain to functions as well. … Continue reading
Posted in arduino, assembly language, avr, avr inline assenbly
Tagged arduino, asm, assembler, assembly, avr, inline
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Arduino Inline Assembly Tutorial (Functions)
At first consideration, the topic of functions seems simple and trite. Just discuss how to “CALL” and “RETURN” to and from a function, right? However, there are many subtopics involved as well. For example, passing and returning parameters, prologue and … Continue reading
µC eXperiment 