![]() As far as I can see there's no need for buffering as the I2C protocol incorporates handshaking, using the ACK/NACK pulses. ![]() The standard Arduino Wire library uses 128-byte or 32-byte send and receive buffers. These routines don't need to use buffers, reducing their RAM requirements to a couple of bytes. In addition, these routines differ from the Arduino Wire library routines in the following ways: Low memory requirements I've named these routines TinyI2C for two reasons: to distinguish them from the existing TinyWire libraries, such as the ones included in the Arduino and Spence Konde's cores, and to emphasise that these routines don't follow the Arduino Wire library naming conventions. Minimal I2C for the New AVR Microcontrollers (TinyMegaI2C) for the new 0-series and 1-series ATtiny and ATmega microcontrollers, such as the ATtiny402 or ATmega4809.Minimal Tiny I2C Routines (TinyI2C) for ATtiny processors with a USI peripheral, such as the ATtiny85.These routines incorporate, and supersede, the two earlier versions of my minimal I2C routines: Please report any incompatibilities on GitHub. ![]() The correct block of code is selected automatically by #if defined statements depending on which Arduino core and Board setting you are using.Īlthough I've tested these routines on selected processors from each category I haven't exhaustively tested every AVR processor. These universal Tiny I2C routines provide master I2C support for all three generations of AVR processors by providing three separate blocks of code. The AVR DA and DB family, such as the AVR128DA48.The 0-series ATmega chips, such as the ATmega4809.The latest ATtiny 0-series, 1-series, and 2-series processors, such as the ATtiny414.Two unusual ATtiny processors that provide a TWI peripheral, the ATtiny48 and 88.Ī new version of the TWI peripheral is featured in:.Most of the original ATmega processors, such as the ATmega328P used in the Arduino Uno, ATmega2560 used in the Arduino Mega 2560, and the ATmega1284P.This provides full master I2C support, and is featured in: The routines to support the USI are based on the code described by Atmel Application Note AVR310. The USI provides master I2C support to ATtiny processors with a USI peripheral, namely: Over the years different generations of AVR chips have featured three different, incompatible peripherals to handle I2C: Universal Serial interface (USI) peripheral These I2C routines are designed to provide master I2C functionality for all Microchip/Atmel AVR processors. The main difference between these routines and the standard Arduino Wire library is that these don't need to use buffers, so have much smaller memory requirements and don't impose a limit on transmissions. To demonstrate the routines I've designed a port scanner that displays the I2C address of a sensor on a dot-matrix display, and a digital thermometer that reads the temperature from an I2C temperature sensor and displays it:Ī simple Dot-Matrix Thermometer based on an ATtiny84 using these TinyI2C routines. This article describes a set of minimal I2C routines that allow just about any Microchip/Atmel AVR processor to connect to I2C peripherals. Tiny I2C Routines for all AVR Microcontrollers
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