https://github.com/sbruhns/arduino-avr-as-template

Template project for getting started with bare metal GNU Assembler development on arduino uno
https://github.com/sbruhns/arduino-avr-as-template

arduino arduino-uno avr-assembly avr-programming gnu-assembler

Last synced: 6 days ago
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Template project for getting started with bare metal GNU Assembler development on arduino uno

• Host: GitHub
• URL: https://github.com/sbruhns/arduino-avr-as-template
• Owner: sbruhns
• License: mit
• Created: 2022-02-09T20:14:28.000Z (almost 3 years ago)
• Default Branch: main
• Last Pushed: 2022-02-09T20:44:01.000Z (almost 3 years ago)
• Last Synced: 2024-02-23T16:26:31.382Z (9 months ago)
• Topics: arduino, arduino-uno, avr-assembly, avr-programming, gnu-assembler
• Language: Assembly
• Homepage:
• Size: 2.93 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# arduino-avr-as-template

Basic template for getting started with bare metal GNU Assembler development on arduino uno

## Build main.hex from main.s

```

make build

```

## Flash main.hex to arduino uno

make sure to update the port the arduino uno is attached to your system in the `Makefile` in that line:

```

PROGRAMMER = -v -patmega328p -carduino -P/dev/cu.usbmodem142201 -b115200 -D

```

Run:

```

make flash

```

## build and flash

```

make

```

## Accessing Registers 

Registers like PORTB, DDRB ... are mapped to the beginning of the memory the adresses can be found in the [datasheet](https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-7810-Automotive-Microcontrollers-ATmega328P_Datasheet.pdf)

main.s contains some example on accessing the PORTB to make the onboard pin blink

```

; register memory mapping (check datasheet)

.equiv PORTB, 0x05

.equiv DDRB, 0x04

.equiv PINB, 0x03

...

out PORTB,r16

```