GitHub - lightside-instruments/ice4pi-example-i2cslave

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Name		Name	Last commit message	Last commit date
Latest commit History 3 Commits
lib/hw/opencores/i2cslave/rtl		lib/hw/opencores/i2cslave/rtl
CHANGELOG		CHANGELOG
Makefile		Makefile
README		README
ice4pi_prog		ice4pi_prog
rot.v		rot.v
top.pcf		top.pcf
top.v		top.v
top.ys		top.ys

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Assuming you are running on a Raspberry Pi 2-4 or Zero (tested with bullseye):

1. Install all necessary packages to synthesize rot.v and build bit image (rot.bin) for the ice4pi:

 sudo apt-get install yosys fpga-icestorm arachne-pnr flashrom
 make

2. Make sure your Pi has I2C enabled (e.g. use raspi-config)

3. Load the rot.bin file to the shield:

 sudo make load

---

4. Validate new i2c device is accessible:

 sudo apt-get install i2c-tools

pi@raspberrypi:~ $ i2cdetect -r -y 2
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- 3c -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- UU -- --

Writing 0x03 to address 0x00 of the device:

pi@raspberrypi:~ $ i2cset -y 1 0x3c 0x00 0x03 b

Two diodes light up!

Reading the level on the PMOD pins:

# Pin IO4 (indexation 1-8) connected to logical zero (0V)
pi@raspberrypi:~/ice4pi-i2cslave$ i2cget -y 1 0x3c 0x04 b
0x00
# Connected to logical one (e.g. 3.3V)
pi@raspberrypi:~/ice4pi-i2cslave$ i2cget -y 1 0x3c 0x04 b
0x20