||6 years ago|
|lib||6 years ago|
|.gitignore||6 years ago|
|CMakeLists.txt||6 years ago|
|LICENSE||7 years ago|
|Makefile||6 years ago|
|README.md||7 years ago|
|avr-c-bp.pro||7 years ago|
|main.c||7 years ago|
|style.astylerc||7 years ago|
AVR C Boilerplate
This is a basic boilerplate for programming AVRs in C.
The project aims to make programming Arduinos in C fun by providing support for basic functionality like GPIO and USART, so you can start developing without having the datasheet open all the time.
It is intended for ATmega328P (the chip in Arduinos), but can be easily adapted to other parts.
Before you can start coding, you need to install a few software packages:
avrdude- the flash tool
avr-libc- libc implementation for AVR
avr-binutils- utils for manipulating AVR binaries
make- to run the Makefile
There's a good chance you already have
make, the rest should be in your
If you're on Arch:
# pacman -S base-devel avr-gcc avr-binutils avr-libc avrdude
If you're on Mac, you should be able to pull the stuff with brew.
main.c is a good starting point - it contains some simple demo code.
You can compile it with
make and flash with
Before you can flash
First, check that the
avrdude options in the file are correct for your system - especially
the device and speed.
# AVRDUDE settings PROG_BAUD = 57600 PROG_DEV = /dev/ttyUSB0 PROG_TYPE = arduino # Build the final AVRDUDE arguments PROG_ARGS = -c $(PROG_TYPE) -p $(MCU) -b $(PROG_BAUD) -P $(PROG_DEV)
PROG_DEVto the device your board is connected to. On Linux it's usually
/dev/ttyUSB0, but it can also be
/dev/ttyACM0or something else. On Mac, it'll be
/dev/cu.xxx. On Windows it's some
Linux and Mac users can use
ls /devto see their devices. Windows users will find this in their Device Manager.
- You may also adjust the baudrate (
PROG_BAUD). Some boards need
TIP: You can look what the Arduino IDE is using - it's running avrdude too.
Adding new files
- If you add a new C file to the project, add an entry for it's
.o(object file, created by the compiler before linking) to the
OBJSlist in the Makefile.
- Similarly, if you add a new folder with header files, add it to
- In case you need
printfwith floats), enable the appropriate LD_FLAGS in the Makefile (it's well commented). Code size will - obviously - grow quite a bit.
- The Arduino UNO bootloader has a quirk where
Double Speed Asynchronous Modefor USART is enabled by default, so if you set your baud rate to 9600, you'd really get 19200.
We correct this in the
usart_init()function to keep things consistent and to avoid confusion.
If you wish to turn this on however, you can do so by using