# Copyright (c) 2016, NECST Laboratory, Politecnico di Milano
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
# OR BUSINESS INTERRUPTION). HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
from . import Pmod
from . import PMOD_GROVE_G3
from . import PMOD_GROVE_G4
from . import MAILBOX_OFFSET
__author__ = "Lorenzo Di Tucci, Marco Rabozzi, Giuseppe Natale"
__copyright__ = "Copyright 2016, NECST Laboratory, Politecnico di Milano"
PMOD_GROVE_TH02_PROGRAM = "pmod_grove_th02.bin"
GROVE_TH02_LOG_START = MAILBOX_OFFSET+16
GROVE_TH02_LOG_END = GROVE_TH02_LOG_START+(500*8)
CONFIG_IOP_SWITCH = 0x1
READ_DATA = 0x2
READ_AND_LOG_DATA = 0x3
STOP_LOG = 0xC
[docs]class Grove_TH02(object):
"""This class controls the Grove I2C Temperature and Humidity sensor.
Temperature & humidity sensor (high-accuracy & mini).
Hardware version: v1.0.
Attributes
----------
microblaze : Pmod
Microblaze processor instance used by this module.
log_running : int
The state of the log (0: stopped, 1: started).
log_interval_ms : int
Time in milliseconds between sampled reads.
"""
def __init__(self, mb_info, gr_pin):
"""Return a new instance of an Grove_TH02 object.
Parameters
----------
mb_info : dict
A dictionary storing Microblaze information, such as the
IP name and the reset name.
gr_pin: list
A group of pins on pmod-grove adapter.
"""
if gr_pin not in [PMOD_GROVE_G3,
PMOD_GROVE_G4]:
raise ValueError("Group number can only be G3 - G4.")
self.microblaze = Pmod(mb_info, PMOD_GROVE_TH02_PROGRAM)
self.log_interval_ms = 1000
self.log_running = 0
self.microblaze.write_mailbox(0, gr_pin)
self.microblaze.write_blocking_command(CONFIG_IOP_SWITCH)
[docs] def read(self):
"""Read the temperature and humidity values from the TH02 peripheral.
Returns
-------
tuple
Tuple containing (temperature, humidity)
"""
self.microblaze.write_blocking_command(READ_DATA)
[tmp, humidity] = self.microblaze.read_mailbox(0, 2)
tmp = tmp/32 - 50
humidity = humidity/16 - 24
return tmp, humidity
[docs] def start_log(self, log_interval_ms=100):
"""Start recording multiple heart rate values in a log.
This method will first call set the log interval before sending
the command.
Parameters
----------
log_interval_ms : int
The time between two samples in milliseconds.
Returns
-------
None
"""
if log_interval_ms < 0:
raise ValueError("Time between samples cannot be less than zero.")
self.log_running = 1
self.log_interval_ms = log_interval_ms
self.microblaze.write_mailbox(0x4, log_interval_ms)
self.microblaze.write_non_blocking_command(READ_AND_LOG_DATA)
[docs] def stop_log(self):
"""Stop recording the values in the log.
Simply send the command 0xC to stop the log.
Returns
-------
None
"""
if self.log_running == 1:
self.microblaze.write_non_blocking_command(STOP_LOG)
self.log_running = 0
else:
raise RuntimeError("No grove TH02 log running.")
[docs] def get_log(self):
"""Return list of logged samples.
Returns
-------
list
List of tuples containing (temperature, humidity)
"""
# stop logging
self.stop_log()
# Prep iterators and results list
[head_ptr, tail_ptr] = self.microblaze.read_mailbox(0x8, 2)
readings = list()
# sweep circular buffer for samples
if head_ptr == tail_ptr:
return None
elif head_ptr < tail_ptr:
for i in range(head_ptr, tail_ptr, 8):
[temp, humid] = self.microblaze.read_mailbox(i, 2)
temp = temp/32 - 50
humid = humid/16 - 24
readings.append((temp, humid))
else:
for i in range(head_ptr, GROVE_TH02_LOG_END, 8):
[temp, humid] = self.microblaze.read_mailbox(i, 2)
temp = temp/32 - 50
humid = humid/16 - 24
readings.append((temp, humid))
for i in range(GROVE_TH02_LOG_END, tail_ptr, 8):
[temp, humid] = self.microblaze.read_mailbox(i, 2)
temp = temp/32 - 50
humid = humid/16 - 24
readings.append((temp, humid))
return readings