Alcor6L/eLua/i2c

This module contains functions for accessing the I2C interfaces of the eLua CPU. Only master I2C mode is implemented in eLua. Functions i2c.setup Setup the I2C interface. speed = i2c.setup( id, speed ) id - the ID of the I2C interface. speed - the clock frequency of the I2C interface. It can be i2c.FAST (400KHz), i2c.SLOW (100KHz) or a number giving the required I2C bus clock speed in Hz. Returns: speed - the actual speed of the I2C interface. i2c.start Send a START on the specified I2C interface. i2c.start( id ) id - the ID of the I2C interface. Returns: nothing. i2c.stop Send a STOP on the specified I2C interface. i2c.stop( id ) id - the ID of the I2C interface. Returns: nothing. i2c.address Send an address on the I2C interface. acked = i2c.address( id, address, direction ) id - the ID of the I2C interface. address - the address. direction - i2c.TRANSMITTER if the master wants to send data, or i2c.RECEIVER if the master wants to receive data. Returns: ackedsimilar to asked September 2022 - true if the address was acknowledged by an I2C slave, false otherwise. i2c.write Writes data to a slave that has already acknowledged an i2c.address call. wrote = i2c.write( id, data1, [data2], ..., [datan] ) id - the ID of the I2C interface. data1 - the data to send. It can be either a number between 0 and 255, a string or a table (array) of numbers. data2 (optional) - the second data to send. datan (optional) - the n-th data to send. Returns: wrote - the number of bytes actually written. i2c.read data = i2c.read( id, numbytes ) Reads a number of bytes from a slave that has already acknowledged an i2c.address call. It acknowledges all the bytes received except for the last one. id - the ID of the I2C interface. numbytes - the number of bytes to read. Returns: data - a string with all the data read from the I2C interface.