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<title>cI2C=Arduino Hardware I2C for AVR (in plain c): cI2C [](https://travis-ci.org/SMFSW/cI2C)</title>
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<div id="projectname">cI2C=Arduino Hardware I2C for AVR (in plain c)
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<div class="header">
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<div class="title">cI2C [![Build Status](<a href="https://travis-ci.org/SMFSW/cI2C.svg?branch=master">https://travis-ci.org/SMFSW/cI2C.svg?branch=master</a>)](<a href="https://travis-ci.org/SMFSW/cI2C">https://travis-ci.org/SMFSW/cI2C</a>) </div> </div>
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</div><!--header-->
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<div class="contents">
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<div class="textblock"><p>Arduino Hardware I2C for AVR (plain c)</p>
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<p>Hardware I2C library for AVR MCUs (lib intended for I2C protocols development in c, for easier ports to other MCUs)</p>
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<h2>Library choice</h2>
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<ul>
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<li>cI2C library implements I2C bus for AVR targets (Uno, Nano, Mega...)<ul>
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<li>you may prefer this one when:<ul>
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<li>working on AVR targets</li>
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<li>interrupts are not needed</li>
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</ul>
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</li>
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</ul>
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</li>
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<li>WireWrapper implements I2C bus for every platform that includes Wire library<ul>
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<li>you would have to use this one when:<ul>
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<li>working on non-AVR targets</li>
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<li>portability is needed (using Wire library)</li>
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</ul>
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</li>
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</ul>
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</li>
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</ul>
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<p>No refactoring is required when switching between <b>cI2C</b> & <b>WireWrapper</b> libs; Both libs share same Typedefs, Functions & Parameters.</p>
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<h2>Notes</h2>
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<ul>
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<li>cI2C is written in plain c (intentionally)</li>
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<li>cI2C does not use any interrupt (yet, but soon will have to)</li>
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<li>cI2C is designed to act as bus Master (Slave mode will be considered in future releases)</li>
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<li>cI2C is set to work on AVR targets only<ul>
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<li>for other targets, you may use <b>WireWrapper</b> instead (will be using Wire)</li>
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</ul>
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</li>
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</ul>
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<h2>Usage</h2>
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<p>This library is intended to be able to work with multiple slaves connected on the same I2C bus. Thus, the I2C bus and Slaves are defined separately.</p>
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<ul>
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<li>On one hand, I2C bus has to be initialized with appropriate speed:<ul>
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<li>use <code>I2C_init(speed)</code>: speed can be chosen from <code>I2C_SPEED</code> enum for convenience, or passing an integer as parameter</li>
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</ul>
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</li>
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<li>On the other hand, Slave(s) have to be defined and initialized too:<ul>
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<li>use <code>I2C_SLAVE</code> typedef to declare slaves structs</li>
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<li>use <code>I2C_slave_init(pSlave, addr, regsize)</code><ul>
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<li><code>pSlave</code>: pointer to the slave struct to initialize</li>
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<li><code>addr</code>: slave I2C address (don't shift addr, lib takes care of that)</li>
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<li><code>regsize</code>: width of internal slave registers (to be chosen from <code>I2C_INT_SIZE</code>)</li>
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</ul>
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</li>
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<li>in case you need to use custom R/W procedures for a particular slave:<ul>
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<li>use <code>I2C_slave_set_rw_func(pSlave, pFunc, rw)</code><ul>
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<li><code>pSlave</code>: pointer to the slave declaration to initialize</li>
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<li><code>pFunc</code>: pointer to the Read or Write bypass function</li>
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<li><code>rw</code>: can be chosen from <code>I2C_RW</code> enum (wr=0, rd=1)</li>
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</ul>
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</li>
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</ul>
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</li>
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</ul>
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</li>
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</ul>
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<p>After all inits are done, the lib can basically be used this way:</p><ul>
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<li><code>I2C_read(pSlave, regaddr, pData, bytes)</code><ul>
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<li><code>pSlave</code>: pointer to the slave struct to read from</li>
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<li><code>regaddr</code>: start address to read from</li>
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<li><code>pData</code>: pointer to the place where datas read will be stored</li>
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<li><code>bytes</code>: number of bytes to read from slave</li>
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<li>returns <code>true</code> if read is ok, <code>false</code> otherwise</li>
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</ul>
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</li>
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<li><code>I2C_write(pSlave, regaddr, pData, bytes)</code><ul>
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<li><code>pSlave</code>: pointer to the slave struct to write to</li>
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<li><code>regaddr</code>: start address to write to</li>
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<li><code>pData</code>: pointer to the block of datas to write to slave</li>
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<li><code>bytes</code>: number of bytes to write to slave</li>
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<li>returns <code>true</code> if write is ok, <code>false</code> otherwise</li>
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</ul>
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</li>
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</ul>
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<h2>Examples included</h2>
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<p>following examples should work with any I2C EEPROM/FRAM with address 0x50 (yet function to get Chip ID are device dependent (and will probably only work on FUJITSU devices))</p><ul>
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<li><a href="examples/ci2c_master_write/ci2c_master_write.ino">ci2c_master_write.ino</a>: Write some bytes to FRAM and compare them with what's read afterwards</li>
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<li><a href="examples/ci2c_master_read/ci2c_master_read.ino">ci2c_master_read.ino</a>: Read some bytes in FRAM</li>
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<li><a href="examples/ci2c_advanced/ci2c_advanced.ino">ci2c_advanced.ino</a>: Redirecting slave write & read functions (to custom functions following typedef)</li>
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</ul>
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<h2>Documentation</h2>
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<p>Doxygen doc can be generated using "Doxyfile".</p>
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<p>See <a href="https://smfsw.github.io/cI2C/">generated documentation</a></p>
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<h2>Release Notes</h2>
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<p>See [release notes]("https://github.com/SMFSW/cI2C/Release Notes.md")</p>
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<h2>See also</h2>
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<p><b>cI2C</b></p><ul>
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<li><a href="https://github.com/SMFSW/cI2C">cI2C github</a> - C implementation of this library</li>
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<li><a href="https://bitbucket.org/SMFSW/ci2c">cI2C bitbucket</a> - C implementation of this library</li>
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</ul>
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<p><b>WireWrapper</b></p><ul>
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<li><a href="https://github.com/SMFSW/WireWrapper">WireWrapper github</a> - Cpp implementation using Wire Wrapper</li>
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<li><a href="https://bitbucket.org/SMFSW/wirewrapper">WireWrapper bitbucket</a> - Cpp implementation using Wire Wrapper </li>
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</ul>
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