![]() It was later discovered that the company actually built into their parser a detection for the Sieve source code and dumped out an EXE that was hand-tweaked assembler! Subsequent test revealed that most compiler vendors supplied libraries that were also tweaked assembler. I remember one company consistently won that test, but was almost dead last in all of the other benchmarks. One test that got most of the attention was the Sieve of Eratosthense. Byte Magazine was always running benchmark tests to see which compiler was the "best". Once again, thanks for My company produced a C compiler back in the old MSDOS days. As you say, knowledge is always useful, and I will indeed try to learn a bit about reading the code, but now I have things much more clear about how useful or not it can be for me. I had always want to have this key points clear. Thanks Nick, that was a very usefull answer to my question. But I wouldn't be writing a big project in assembler these days, personally. It's fine to learn how to read it, knowledge is always useful. The compiler can keep track of register usage, use "tricks" you may not have thought of, move instructions around, and generally produce fast, tight code. You will probably write slower code if you try to do it yourself in assembler, unless you are a real expert. Modern C (and C++) compilers optimize very well. However these days it is only really required for low-level system programming, where you either need to do something not supported by other languages (eg. Gammon Forum : Programming : General : GPascal - a blast from the past a wrong definition for DDRB and PORTB get included… probably because there isn’t the correct macro set to select the device? I’ll have to look into this later.I've written more assembler than I care to remember, for example a Pascal compiler written in assembler for the Apple 2: ![]() Which worked, now here when using we suddenly have 00000030 : ![]() In the previous program we had #define PORTB 0x18 You can also see all the interrupts in the interrupt vector table, most of them being unpopulated.Īnd here we can also solve the mystery of why stuff doesn’t light up anymore. You can see the main function after the initializer-stub inserted by avr-gcc. here C:\Users\Maxi\Desktop\atmega_bare_assembly\.pioenvs\attiny85>"C:\Users\Maxi\.platformio\packages\toolchain-atmelavr\bin\avr-objdump.exe" -d firmware.elf PROGRAM: 0.7% (used 60 bytes from 8192 bytes)īe careful with the assembler include files though, the tn85def.inc I found is apparently written in the assembler syntax for the Atmel Studio assembler and will cause syntax errors when compiled with avr-gcc/avr-as. pioenvs\attiny85\firmware.hexĭATA: 0.0% (used 0 bytes from 512 bytes) pioenvs\attiny85\src\main.o -L.pioenvs\attiny85 -Wl,-start-group -lm -Wl,-end-group pioenvs\attiny85\firmware.elf -Os -mmcu=attiny85 -Wl,-gc-sections -flto -fuse-linker-plugin. pioenvs\attiny85\src\main.o src\main.SĪvr-gcc -o. platformio -f -c eclipse runĪvr-gcc -x assembler-with-cpp -Os -Wall -ffunction-sections -fdata-sections -flto -mmcu=attiny85 -DF_CPU=8000000L -DPLATFORMIO=40000 -DARDUINO_AVR_ATTINYX5 -Isrc -Iinclude -c -o. turns on an LED which is connected to PB5 (digital out 13) Meaning it will just use avr-gcc -x assembler-with-cpp. You can remove the framework = arduino line and it will use the _bare builder. Thanks for any kind of help, which is very much appreciated. Where do I have to put this file so that the “Build” option does not reply with an error of not finding the tn85def.inc file? So far located it in “src”, but also in “include”. I wrote a simple assembly program and wanted to include in the header a special tn85def.inc file (long story short, some of the tn85def.inc files around have an error in their timer/interrupt definitions). But i dont want any Arduino integration on the chip. My question is, do I need to go via all this “create projects” options and do i need this workspace with “.pioenvs” and “.vscode” and all that? If yes, how do I do it?įor now I went via creating a new project and chose a generic attiny85 with the Arduino platform. Now I wanted to use my Mac and a simple programmer as well as PlatformIO to do basically the same (maybe with less wires and raw electronic stuff around): just writing pure assembly code for some of these Attinys and Atmegas. So far I made it immediately and smoothly working with an Raspberry PI using the avrdude via the Terminal. I want to write purely in assembly language (AVR) to some Attiny85 or Atmega328P ♜. I’m a newbie here, downloaded (Mac OS) PlatformIO 2 days ago.
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