Arduino-like peripheral drivers for the ATtiny817 Xplained Mini boards. Goal is to be functionally equivalent to the Arduino.h HAL.

• For UART to work, DTR must be enabled (when using the mEDBG programmer's USB2UART converter)
• For some utilities to work (for example, the millis() function), you need to call hal_init() at the start of the program!

When doing pin-planning with the Xplained Mini board, the following things should be considered:

• PA0 is used for the reset pin and is NOT CONNECTED by default
• PC5 is used for the USER BUTTON and thus it has a 100k pull-up resistor attached to it and is NOT CONNECTED to the pinheader row by default (a gap has to be bridged for it to work)
• PC0 has the USR LED connected to it and thus might not output as much power as needed
• PB2 and PB3 are UART pins which are connected to the ATmega32u4 through 1k resistors

• GPIO basics

  • digitalWrite()
  • digitalToggle()
  • digitalRead()
  • pinMode()

• Misc. functions

  • delay()
  • map()
  • millis()

• Serial

  • begin()
  • available()
  • read()
  • write()
  • print()
  • println()

• SPI

  • begin()
  • beginTransaction()
  • transfer()
  • transfer16() [not tested]
  • endTransaction()
  • setBitOrder()
  • end()

• Misc. functions
  • delayMicroseconds()
  • micros()
• Math
  • constrain()
  • max()
  • min()
  • pow()
  • sq()
  • sqrt()
• Analog
  • analogRead()
  • analogReference()
  • analogWrite()
• Serial
  • availableForWrite()
  • end()
  • find()
  • findUntil()
  • flush()
  • parseFloat()
  • parseInt()
  • peek()
  • readBytes()
  • readBytesUntil()
  • setTimeout()
  • serialEvent()
• I2C
  • begin()
  • end()
  • beginTransaction()
  • endTransaction()
  • setBitOrder()
  • setClockDivider()
  • setDataMode()
  • transfer()
  • usingInterrupt()