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Add read word data #1

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2d4967a
Make interface to write_i2c_block_data more robust and cleanup some d…
matteius Oct 24, 2022
e86d343
added read_word_data impl
vroomfondel Mar 19, 2024
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25 changes: 15 additions & 10 deletions usmbus/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,14 +14,14 @@ class SMBus(I2C):
Hopefully this will allow you to run code that was targeted at
py-smbus unmodified on micropython.

Use it like you would the machine.I2C class:
Use it like you would the machine.I2C class:

import usmbus.SMBus

bus = SMBus(1, pins=('G15','G10'), baudrate=100000)
bus = SMBus(id=0, scl=machine.Pin(15), sda=machine.Pin(10), freq=100000)
bus.read_byte_data(addr, register)
... etc
"""
"""

def read_byte_data(self, addr, register):
""" Read a single byte from register of device at addr
Expand All @@ -45,11 +45,13 @@ def write_i2c_block_data(self, addr, register, data):
""" Write multiple bytes of data to register of device at addr
Returns None """
# writeto_mem() expects something it can treat as a buffer
if isinstance(data, int):
data = bytes([data])
if not isinstance(data, bytes):
if not isinstance(data, list):
data = [data]
data = bytes(data)
return self.writeto_mem(addr, register, data)

# The follwing haven't been implemented, but could be.
# The following haven't been implemented, but could be.
def read_byte(self, *args, **kwargs):
""" Not yet implemented """
raise RuntimeError("Not yet implemented")
Expand All @@ -58,11 +60,14 @@ def write_byte(self, *args, **kwargs):
""" Not yet implemented """
raise RuntimeError("Not yet implemented")

def read_word_data(self, *args, **kwargs):
""" Not yet implemented """
raise RuntimeError("Not yet implemented")
def read_word_data(self, addr, register) -> int:
""" Read a single word (2 bytes) from a given register;
little-endian decode that word as int
Returns int
"""

return int.from_bytes(self.i2c.readfrom_mem(addr, register, 2), 'little')

def write_word_data(self, *args, **kwargs):
""" Not yet implemented """
raise RuntimeError("Not yet implemented")