ESP32 platform support libraries

Helper for building GPIO interfaces on AVR platforms.

Build the examples in CI.

Ideally, each platform can be detected and the examples can be completly platform independent (Will need a timer interface for delays)

As ATmega32u4 hardware.

Setup I2C on ATmega32u4.

Method for writing text to a display

Each driver or interface should have unit tests. Since the code is generic it can be compiled with the usual gcc toolchain.

Tests should be run in CI (#14 )

USB needs to be setup so the board appears as a serial port on Windows/Linux. And can therefore be targeted by the flash script.

Should look into how Arduino does it. There is also LUFA which may be relevant.

Setup linter

Support for ATmega32U4.

• UART
• I2C
• USB

https://www.adafruit.com/product/1438

• PCA9685 (see: #8 )
• TB6612FNG

#5 Added a generic UART helper. Use that for the four UARTs on ATmega2560.

Pretty sure this is the stack allocated buffer. But malloc didn't seem to work.

SPI interface

Examples are multi-platform.

Need a common timer interface for delays.

PWM control for AVR processors (328p, 2560)

Platform support for ATmega329p (Arduino Uno)

delayMs, delayUs, millis, micro, etc

Fonts and graphics data can go in flash memory.