This is my AVR library I've written over the years working on different projects.
The library is designed to be configured and compiled for each project individually. To achieve this, each project using it must define two files: hwdefs.h and swdefs.h. Library modules include either none, one or both of these files.
hwdefs.h is used to define the hardware layout of your project (pin mapping) for modules that need one. At minimal hwdefs.h must define DDR and PIN macros like this:
#define DDR(x) (*(&x - 1))
#define PIN(x) (*(&x - 2))swdefs.h is used to define software options, like which functions to include.
| Module | Description | hwdefs.h | swdefs.h |
|---|---|---|---|
| adc | ADC peripheral | ADC_AVG_SAMP | |
| circbuf8 | Circular byte buffer | ||
| cmt | Cooperative multitasking | CMT_NEED_MINSP, CMT_MUTEX_FUNC | |
| i2c | I2C peripheral | I2C_USE_CMT | |
| lcd | HD44780 high level routines. Requires exactly one low level implementation | LCD_WIDTH, LCD_HEIGHT, LCD_USE_FB, LCD_NEED_func | |
| lcd_io | HD44780 low level (IO pins) | LCD IO pin map | |
| lcd_pcf8574 | HD44780 low level (PCF8574) | PCF LCD pin map | LCD_I2C_SPEED |
| rtc.h | RTC routines common header. Requires exactly one rtc implementation. | ||
| rtc_mcp79410 | RTC impl. with MCP79410 | ||
| rtc_ds3231 | RTC impl. with DS3231 | ||
| rtc_timer2 | RTC impl. with Timer2 | ||
| serque | UART peripheral | ||
| spi | SPI peripheral | SPI_USE_CMT | |
| time | Time routines |