Alcor6L/PicoLisp/i2c

This module contains functions for accessing the I2C interfaces of the Alcor6L CPU. Only master I2C mode is implemented in eLua (and Alcor6L). Functions i2c-setup Setup the I2C interface. (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: NIL. i2c-stop Send a STOP on the specified I2C interface. (i2c-stop id) id - the ID of the I2C interface. Returns: NIL. i2c-address Send an address on the I2C interface. (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: asked - 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. (i2c-write id any1 [any2] ... [anyn] ) id - the ID of the I2C interface. any1 - the data to send. It can be either a number between 0 and 255, a symbol or a list. any2 (optional) - the second data to send. anyn (optional) - the n-th data to send. Returns: wrote - the number of bytes actually written. i2c-read (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.