Written in VHDL.
based on https://embeddedmicro.weebly.com/raspberry-pi-i2c-timing.html
Purpose is an micro interface to access registers inside a FPGA.
Interface needs only two pins SDA and SCL except power pins.
Raspberry-Pi could be used to access FPGA board using i2c pins.
https://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/configuring-i2c
Using Python:
http://www.instructables.com/id/Raspberry-Pi-I2C-Python/
Contains:
i2cslave.vhd : code
tb_i2cslave_write.vhd, tb_i2cslave_read.vhd : testbenches
compile.bat, elaborate.bat, run.bat : windows scripts for ghdl simulator
write.gtkw, read.gtkw, demo.gtkw : signals display for Gtkwave software
i2cdemo.vhd: example (i2cdemo project)
Altera Cyclone II (EP2C5T144C8) : ~140 Logic Elements used.
i2cdemo project tested with raspberry pi and cyclone II developpement board (see raspi directory)
Need to add open drain pads for SDA SCL (use positive logic)
For raspberry pi with python:
sudo apt-get install i2c-tools
sudo apt-get install python-smbus
