AVR Development
The Atmel AVR micros are well supported in the FOSS world with complete development tool chains such as a C compiler, simulator, debugger, downloader etc.
We prefer to develop in C and use standard Unix command-line tools.
An alternative is to use the Arduino Integrated Development Environment (IDE), which runs on a Java Virtual Machine (JVM) and the coding style is C++ based.
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Support in Debian GNU/Linux and variants
The Atmel AVR "toolchains" have been available for Debian/Ubuntu Linux for some years. Specifically:
- binutils-avr - Binary utilities supporting Atmel's AVR targets
- gcc-avr - The GNU C compiler (cross compiler for avr)
- avr-libc - libc for AVR
- gdb-avr - The GNU Debugger for avr
- simulavr - Atmel AVR simulator
- AVRDUDE - software for programming Atmel AVR microcontrollers
All the other usual tools such as make, editors, version control etc. can be used as per any other development project.
Makefile template
A template Makefile:
PROJNAME = ...
DEVICE = atmega328p
CC = avr-gcc
INCS = -Iusbdrv -I.
CFLAGS = -Wall -Os $(INCS) -mmcu=$(DEVICE) -DDEBUG_LEVEL=0
AVRDUDE = avrdude -p $(DEVICE) -c arduino -P /dev/ftdi_cable1 -b 57600 -v
USBDRV_OBJS = usbdrv/usbdrv.o usbdrv/usbdrvasm.o usbdrv/oddebug.o
# symbolic targets:
all: $(PROJNAME).hex
.c.o:
$(CC) -c $(CFLAGS) $< -o $@
.S.o:
$(CC) -x assembler-with-cpp -c $(CFLAGS) $< -o $@
.c.s:
$(CC) -S $(CFLAGS) $< -o $@
%.bin: %.o $(USBDRV_OBJS)
$(CC) $(CFLAGS) -o $@ $< $(USBDRV_OBJS)
%.hex: %.bin
rm -f $@
avr-objcopy -j .text -j .data -O ihex $< $@
flash: all
$(AVRDUDE) -U flash:w:$(PROJNAME).hex
Downloading to target
The standard downloader for Linux is AVRDUDE. It supports a variety of downloading techniques:
- the Arduino-compatible serial loader already programmed into FLASH memory and some form of serial interface, such as the FT232R based USB-serial cables
- a Bus Pirate connected to the Atmel AVR 6-pin ICSP programming header
In the case of the AVR Stick, we use an 8-pin Small Outline Integrated Circuit (SOIC) testclip connected to an ICSP programmer (such as Bus Pirate).
See also
External links
- How to Program the AVR with avr-gcc and AVRLib
- AVR Tutorial at LadaAda
- AVR Libc Reference Manual at atmel.com
- MHVLib - An Efficiency Oriented Runtime Library for AVR Microcontrollers
