Slice of Pi/O

rpipio.jpg

slipi.jpg

The Slice of Pi/O is an I2C expansion board for the Raspberry Pi.

Power

The Slice of Pi/O may be configured in 3V3 or 5V modes of operation via a jumper.

Power may be taken from the board on PWR and GND if a suitable 4-pin header is fitted.

RPi I2C

Without device tree
sed -i 's/^blacklist/#blacklist/g' /etc/modprobe.d/raspi-blacklist.conf
With device tree
echo "device_tree_param=i2c1=on" >> /boot/config.txt
With and without device tree
echo 'SUBSYSTEM=="i2c-dev", MODE:="0666"' >> /etc/udev/rules.d/10-local.rules
echo "options i2c_bcm2708 baudrate=400000" >> /etc/modprobe.d/modprobe.conf
echo 'i2c-dev' >> /etc/modules
reboot

For the MCP23017 a baudrate of 900000 has been tested and appears to work satisfactorily. You should experiment with this value.

I/O

RPi revision I2C device Default MCP Address
1 /dev/i2c-0 0x20
2 /dev/i2c-1 0x20

Pickle Microchip PIC ICSP

Low Voltage Programming with VPP at 3V3 or 5V

Separate data I/O connections (only supported option)

SLICE OF Pi/O                     PICMicro
=============                     ========

PWR-------------------------------VDD

GND-------------------------------VSS

A0--------------------------------VPP

A1--------------------------------PGC

A2--------------1000R--------+----PGD
                             |
A3---------------------------+

A4--------------------------------PGM (1)
  1. Not used by all LVP compatible devices.
This website uses cookies for visitor traffic analysis. By using the website, you agree with storing the cookies on your computer.More information