I2C

Matthias Trute mtrute@web.de Version 1.0.2 - 2016-10-19

This package provides some more or less generic I2C related words. They are generic in a sense that they depend on a low level hardware driver, that provides some very basic routines to access the I2C interface. They are still specific to amforth, visit http://amforth.sourceforge.net/TG/recipes/I2C-Generic.html

They are tested with amforth on an Atmega with it's hardware I2C module called TWI.

i2c.frt

above the specific driver words some generic but still low level words.

i2c.begin         -- starts a I2C bus cycle
i2c.end           -- ends a I2C bus cycle
i2c.n>            -- send n bytes to device   (n> means from data stack)
i2c.>n            -- read n bytes from device (>n means to data stack)

i2c-detect

This command scans the bus and prints a small overview over the addresses that respond to the ping.

(ATmega1280)> i2c.detect 
      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F
 0:                       -- -- -- -- -- -- -- -- --
10:  -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20:  -- -- -- -- -- -- -- 27 -- -- -- -- -- -- -- --
30:  -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40:  -- -- 42 -- -- -- -- -- -- -- -- -- -- -- -- --
50:  50 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60:  -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70:  -- -- -- -- -- -- -- --                        
 ok

The tool and the output is designed to mimic a linux tool of the same name.

i2c-eeprom*

The 24Cxx chips using 2 byte addresses are supported. The interface uses the block wordset API. The API transfers the standard block size to a fixed block buffer defined outside of this package.