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""" Defines the BOARD class that contains the board pin mappings and RF module HF/LF info. """
# -*- coding: utf-8 -*-
# Copyright 2015-2018 Mayer Analytics Ltd.
#
# This file is part of pySX127x.
#
# pySX127x is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public
# License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# pySX127x is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
# details.
#
# You can be released from the requirements of the license by obtaining a commercial license. Such a license is
# mandatory as soon as you develop commercial activities involving pySX127x without disclosing the source code of your
# own applications, or shipping pySX127x with a closed source product.
#
# You should have received a copy of the GNU General Public License along with pySX127. If not, see
# <http://www.gnu.org/licenses/>.
import RPi.GPIO as GPIO
import spidev
import time
class BOARD:
""" Board initialisation/teardown and pin configuration is kept here.
Also, information about the RF module is kept here.
This is the Raspberry Pi board with one LED and a modtronix inAir9B.
"""
# Note that the BCOM numbering for the GPIOs is used.
DIO0 = 22 # RaspPi GPIO 22
DIO1 = 23 # RaspPi GPIO 23
DIO2 = 24 # RaspPi GPIO 24
DIO3 = 25 # RaspPi GPIO 25
LED = 18 # RaspPi GPIO 18 connects to the LED on the proto shield
SWITCH = 4 # RaspPi GPIO 4 connects to a switch
# The spi object is kept here
spi = None
# tell pySX127x here whether the attached RF module uses low-band (RF*_LF pins) or high-band (RF*_HF pins).
# low band (called band 1&2) are 137-175 and 410-525
# high band (called band 3) is 862-1020
low_band = True
@staticmethod
def setup():
""" Configure the Raspberry GPIOs
:rtype : None
"""
GPIO.setmode(GPIO.BCM)
# LED
GPIO.setup(BOARD.LED, GPIO.OUT)
GPIO.output(BOARD.LED, 0)
# switch
GPIO.setup(BOARD.SWITCH, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
# DIOx
for gpio_pin in [BOARD.DIO0, BOARD.DIO1, BOARD.DIO2, BOARD.DIO3]:
GPIO.setup(gpio_pin, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
# blink 2 times to signal the board is set up
BOARD.blink(.1, 2)
@staticmethod
def teardown():
""" Cleanup GPIO and SpiDev """
GPIO.cleanup()
BOARD.spi.close()
@staticmethod
def SpiDev(spi_bus=0, spi_cs=0):
""" Init and return the SpiDev object
:return: SpiDev object
:param spi_bus: The RPi SPI bus to use: 0 or 1
:param spi_cs: The RPi SPI chip select to use: 0 or 1
:rtype: SpiDev
"""
BOARD.spi = spidev.SpiDev()
BOARD.spi.open(spi_bus, spi_cs)
BOARD.spi.max_speed_hz = 5000000 # SX127x can go up to 10MHz, pick half that to be safe
return BOARD.spi
@staticmethod
def add_event_detect(dio_number, callback):
""" Wraps around the GPIO.add_event_detect function
:param dio_number: DIO pin 0...5
:param callback: The function to call when the DIO triggers an IRQ.
:return: None
"""
GPIO.add_event_detect(dio_number, GPIO.RISING, callback=callback)
@staticmethod
def add_events(cb_dio0, cb_dio1, cb_dio2, cb_dio3, cb_dio4, cb_dio5, switch_cb=None):
BOARD.add_event_detect(BOARD.DIO0, callback=cb_dio0)
BOARD.add_event_detect(BOARD.DIO1, callback=cb_dio1)
BOARD.add_event_detect(BOARD.DIO2, callback=cb_dio2)
BOARD.add_event_detect(BOARD.DIO3, callback=cb_dio3)
# the modtronix inAir9B does not expose DIO4 and DIO5
if switch_cb is not None:
GPIO.add_event_detect(BOARD.SWITCH, GPIO.RISING, callback=switch_cb, bouncetime=300)
@staticmethod
def led_on(value=1):
""" Switch the proto shields LED
:param value: 0/1 for off/on. Default is 1.
:return: value
:rtype : int
"""
GPIO.output(BOARD.LED, value)
return value
@staticmethod
def led_off():
""" Switch LED off
:return: 0
"""
GPIO.output(BOARD.LED, 0)
return 0
@staticmethod
def blink(time_sec, n_blink):
if n_blink == 0:
return
BOARD.led_on()
for i in range(n_blink):
time.sleep(time_sec)
BOARD.led_off()
time.sleep(time_sec)
BOARD.led_on()
BOARD.led_off()