You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
53 lines
1.8 KiB
53 lines
1.8 KiB
# 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.
|
|
|
|
## Requirements
|
|
|
|
Before you can start coding, you need to install a few software packages:
|
|
|
|
- `avrdude` - the flash tool
|
|
- `avr-gcc` - compiler
|
|
- `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
|
|
distribution's repos.
|
|
|
|
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*.
|
|
|
|
## Getting started
|
|
|
|
The provided `main.c` is a good starting point - it contains some simple demo code.
|
|
|
|
You can compile it with `make` and flash with `make flash`.
|
|
|
|
### adjusting the Makefile
|
|
|
|
**Before you can flash,** check that the `avrdude` options in the file are correct for your system
|
|
- especially the device (`/dev/ttyUSB0`). It can differ if you're on Mac or Windows (`/dev/cu.xxx`, resp. `COMx`).
|
|
|
|
You can look what the Arduino IDE is using - it's running avrdude internally as well.
|
|
|
|
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 `OBJS` list in the Makefile.
|
|
|
|
Similarly, if you *add a new folder with header files*, add it to `INCL_DIRS`.
|
|
|
|
In case you need `printf` (or `printf` with floats), enable the appropriate LD_FLAGS in the Makefile (it's well
|
|
commented). Code size will - obviously - grow quite a bit.
|
|
|