Pi HAT ID EEPROM library¶
The Raspberry Pi HAT specification defines the existence of an ID EEPROM that is connected to pins 27 and 28 of the 40-way connector. This ID EEPROM contains a machine-readable description of the HAT hardware in a form that allows the Pi to automatically configure the GPIOs and load appropriate device drivers.
The pihat
library provides a mechanism for easily extracting and
manipulating the contents of the ID EEPROM. For example:
from pihat.eeprom import EepromDevice
with EepromDevice() as eeprom:
print("Board UUID is %s" % eeprom.uuid)
print("Board uses %d GPIOs" %
sum(x.used for x in eeprom.pins))