#Due wire library software#

(GPIO16 needs to be tied to RST to wake from deepSleep.) The chip can sleep for at most ESP.deepSleepMax() microseconds. mode is one of WAKE_RF_DEFAULT, WAKE_RFCAL, WAKE_NO_RFCAL, WAKE_RF_DISABLED. ℹ️About GitHub Wiki SEE, a search engine enabler for GitHub WikisĪs GitHub blocks most GitHub Wikis from search engines.Some ESP-specific APIs related to deep sleep, RTC and flash memories are available in the ESP object.ĮSP.deepSleep(microseconds, mode) will put the chip into deep sleep. ⚠️ ** Fallback** ⚠️ 🗂️ Page Index for this GitHub Wiki

#Due wire library software#

As far as I know, none of the software implementations support multi-master I2C buses.

Beside master and slave, there are also I2C sniffers.

The I2C Anything by Nick Gammon can be used to read and write variables and data that are longer than a byte in a easy way.

When the Slave should respond, the SDA signal is set as input, just before the rising clock of SCL to avoid a shortcut. This is also one of a very few libraries that sets the SDA signal as a output HIGH and LOW instead of relying on the pullup resistor.

There is a I2C library by which is the only library that uses shiftOut() for the 8 databits, and after that it reads or writes the acknowledge bit.

Preinstalled Wire library for STM32duino. Master mode.ĭefault preinstalled Wire library for Arduino's SAMD21 boards.ĭefault preinstalled Wire library for SparkFun's SAMD21 boards. Preinstalled Wire library for the ATTin圜oreįor ATtiny microcontrollers. Larry Bank has also a Multi-BitBang version. Supports ATmega, ATtiny, and Raspberry PI. The software slave mode works with some restrictions. Class name clashes with so cannot be included into the same source code, even indirectly.Ĭopies most of the library from AVR and adds time-out and concurrency tweaks. Uses its own fastDigitalWrite() functions to write to port registers directly. No, SoftI2cMaster and FastI2cMaster inherit from I2cMasterBase which is top-level Inherits from TwoWire so SoftI2CMaster inherits the RX/TX buffers used in TwoWire but does not use themĪ single 32-byte buffer is shared between RX and TX. Runs at 100kHz clock speed on a Arduino Uno. Also provides 2 simple bigbanging implementations. Provides an adapter class that delegates to other 3rd party libraries. Yes, TwoWireInterface, SimpleWireInterface, SimpleWireFastInterface are top-level Uses digitalWrite() to set SDA line actively to HIGH instead of relying on passive pullup resistors, which may cause problems on open-drain I2C lines. Breaks some devices on some fast 32-bit processors due to exceeding I2C clock maximum. No delayMicroseconds() between bit transitions. Using the Stream class, just like the Arduino Wire library. Using compatible standard Arduino functions. Receive functionality incomplete, no ACK/NACK from master to slaveīased upon XantoI2C. Made from scratch, using straighforward Arduino functions. The RX and TX buffers are supplied by the user, so can be any length. There are a few I2C software slave implementations, but they do not follow the I2C requirements and are only for one type of processor. The software I2C libraries are generally master-mode only. In fact, since the design of the TwoWire class does not allow polymorphism (see ), it is often better for the 3rd party class to avoid inheriting its implementation from TwoWire or even Stream (see ). Some 3rd party I2C libraries will inherit from the TwoWire class, but it is also possible to provide API compatibility without subclassing TwoWire. The default Wire library for each platform will use a class named TwoWire. In this context, compatibility means source-code API level, instead of runtime level.

In the table below, the 'Arduino Wire compatible functions' column indicates whether the given library is mostly compatible with the original Arduino AVR Wire library. Most 3rd party I2C libraries will also try to follow the same API as the original AVR Wire library. These alternative Wire libraries are mostly compatible with API of the original AVR Wire library, but many of them will deviate slightly from the AVR version to implement additional functionality that is available only for the particular microcontroller. Different platforms using different microcontrollers will provide their own versions of the library and are preinstalled when their 'Arduino Core' is installed. The original Wire library for AVR processors is described in. This pages gives an overview of many libraries for I2C for Arduino boards. The number of software I2C libraries are still increasing.