AVRBits

A collection of useful things in C to complement existing avr-libc features.

The style will appeal to people that prefer:

• standard types
• enum instead of macros where appropriate
• code that works correctly between mainloop and interrupt
• code that works correctly with system clock prescaler

Supported Targets

• ATMEGA328p

Modules

Some modules depend on others (e.g. uart uses fifo).

pin

• read and write pins using Arduino pin naming conventions
• set/clear pin change interrupt handlers

fifo

• byte oriented FIFO
• variable buffer size set at initialisation time
• works between interrupt and mainloop

semaphore

• non-blocking semaphores (i.e. flags)
• works between interrupt and mainloop

spi

• master mode only
• bit rate and mode settings
• configures pins as required

compile options:

• F_CPU (system clock in Hz)

uart

• baud rate setting
• buffered tx and rx
• put/get from interrupt and mainloop
• tx_empty/rx_ready handlers
• depends on fifo

compile options:

• F_CPU (system clock in Hz)
• UART_TX_SIZE (tx buffer size)
• UART_RX_SIZE (rx buffer size)

rccal

• hardware dependent RC oscillator calibration
• uses TC2 (32768Hz async mode) to calibrate RC using TC0 (io clock)

License

AVRBits has an MIT license.