# -*- coding: utf-8 -*-
# (c) Copyright 2020 Sensirion AG, Switzerland
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# _____ _ _ _______ _____ ____ _ _
# / ____| /\ | | | |__ __|_ _/ __ \| \ | |
# | | / \ | | | | | | | || | | | \| |
# | | / /\ \| | | | | | | || | | | . ` |
# | |____ / ____ \ |__| | | | _| || |__| | |\ |
# \_____/_/ \_\____/ |_| |_____\____/|_| \_|
#
# THIS FILE IS AUTOMATICALLY GENERATED AND MUST NOT BE EDITED MANUALLY!
#
# Generator: sensirion-shdlc-interface-generator 0.5.1
# Product: Sensor Bridge
# Version: 0.1.0
#
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# flake8: noqa
from __future__ import absolute_import, division, print_function
from sensirion_shdlc_driver.command import ShdlcCommand
from struct import pack, unpack
import logging
log = logging.getLogger(__name__)
[docs]class SensorBridgeCmdReadBufferBase(ShdlcCommand):
"""
SHDLC command 0x50: "Read Buffer".
"""
[docs] def __init__(self, *args, **kwargs):
super(SensorBridgeCmdReadBufferBase, self).__init__(
0x50, *args, **kwargs)
[docs]class SensorBridgeCmdReadBuffer(SensorBridgeCmdReadBufferBase):
[docs] def __init__(self, handle):
"""
Read Buffer Command
Reads data stored in the buffer of a repeated transceive.
:param int handle:
The handle of the repeated transceive from which the data should be
returned.
"""
super(SensorBridgeCmdReadBuffer, self).__init__(
data=b"".join([pack(">B", handle)]),
max_response_time=0.05,
post_processing_time=0.0,
min_response_length=8,
max_response_length=255
)
[docs] @staticmethod
def interpret_response(data):
"""
:return:
- lost_bytes (int) -
Number of bytes lost due to buffer overrun.
- remaining_bytes (int) -
Number of bytes remaining in the buffer.
- rx_data (bytes) -
Buffered values. The data is returned in
``n*[header][readI2cDataOfOneTransceive]`` where header:
- 0: valid data
- 1: NACK from Sensor (not available)
- 2: Timeout in Read Operation
- 3: Timing Error. Hardware and/or Sensor can not provide the
requested data rate
:rtype: tuple
"""
lost_bytes = int(unpack(">I", data[0:4])[0]) # uint32
remaining_bytes = int(unpack(">I", data[4:8])[0]) # uint32
rx_data = bytes(data[8:]) # bytearray
return lost_bytes,\
remaining_bytes,\
rx_data