shepherd-agent/shepherd/plugins/scout/scout.py

#!/usr/bin/env python3

"""
Plugin to interface with the shepherd scout pcb modules. Also semi-compatible
with the older TrapCtrl style boards and Pi HATs based on the SleepyPi2, provided
they are running the Shepherd Scout firmware.

The TDW serial message format is used to pull data from the companion board and
interact with its RTC and set alarms. This library uses a seperate thread 
to handle the comms with the supervising microcontroller. Interface functions
add a request to the queue, and some may wait for a state to be updated before
returning (with a timeout).
"""

import shepherd.config as shconf
import shepherd.plugin
from . import tdw

import queue
import threading
import re
import serial
import time
from datetime import datetime

from enum import Enum, auto

from collections import namedtuple


class MsgName(Enum):
    BATV = "batv"
    BATI = "bati"
    TIME = "time"
    ALARM = "alarm"
    AUX5V = "aux5v"
    PWM1 = "pwm1"
    PWM2 = "pwm2"
    OUT1 = "out1"
    OUT2 = "out2"
    LOG = "log"
    MEASUREMENT = "meas"
    def __str__(self):
        return str(self.value)

logmsgs = ["LE_NONE - Empty log",
  "LE_POWERUP - Scout startup",
  "LE_PI_BOOT_TIMEOUT - Tried to turn on Pi but did not recieve succesful boot signal",
  "LE_PI_ON - Pi has booted",
  "LE_LOW_VOLT_START_SHUTDOWN - Initiated Pi shutdown due to low supply voltage",
  "LE_PI_SIGNAL_START_SHUTDOWN - Pi started to shut itself down",
  "LE_PI_SHUTDOWN_TIMEOUT - Pi did not signal successful shutdown, so killed power",
  "LE_MAIN5V_DISABLE - Main Pi power turned off",
  "LE_VOLT_GOOD_MAIN5V_ENABLE - Turned Pi power on after voltage raised enough",
  "LE_ALARM_MAIN5V_ENABLE - Turned Pi power on after wakeup alarm was hit"]

class ScoutPlugin(shepherd.plugin.Plugin):
    @staticmethod
    def define_config(confdef):
        confdef.add_def('boardver', shconf.StringDef())
        confdef.add_def('serialport', shconf.StringDef())

    def __init__(self, pluginInterface, config):
        super().__init__(pluginInterface, config)
        self.config = config
        self.interface = pluginInterface
        self.plugins = pluginInterface.other_plugins
        self.hooks = pluginInterface.hooks

        self.msg_handler = tdw.MessageHandler(config["serialport"], 57600)

        self.interface.register_function(self.get_batv)
        self.interface.register_function(self.get_bati)
        self.interface.register_function(self.get_time)
        self.interface.register_function(self.set_alarm)
        self.interface.register_function(self.set_aux5v)
        self.interface.register_function(self.set_pwm1)
        self.interface.register_function(self.set_pwm2)
        self.interface.register_function(self.set_out1)
        self.interface.register_function(self.set_out2)
        self.interface.register_function(self.test_logs)

        self.interface.register_function(self.test)

    def get_batv(self):
        rqst = self.msg_handler.send_request(MsgName.BATV.value)
        if rqst.wait_for_response():
            return rqst.response.arguments[0]
        return None

    def get_bati(self):
        rqst = self.msg_handler.send_request(MsgName.BATI)
        if rqst.wait_for_response():
            return rqst.response.arguments[0]
        return None

    def set_aux5v(self, enabled):
        cmd = self.msg_handler.send_command(MsgName.AUX5V, [str(enabled).lower()])
        if cmd.wait_for_response():
            return cmd.response.arguments[0]
        return None

    def set_pwm1(self, enabled, pulse_length):
        cmd = self.msg_handler.send_command(MsgName.PWM1, [str(enabled).lower(), str(pulse_length)])
        if cmd.wait_for_response():
            return cmd.response.arguments[0]
        return None

    def set_pwm2(self, enabled, pulse_length):
        cmd = self.msg_handler.send_command(MsgName.PWM2, [str(enabled).lower(), str(pulse_length)])
        if cmd.wait_for_response():
            return cmd.response.arguments[0]
        return None

    def set_out1(self, enabled):
        cmd = self.msg_handler.send_command(MsgName.OUT1, [str(enabled).lower()])
        if cmd.wait_for_response():
            return cmd.response.arguments[0]
        return None

    def set_out2(self, enabled):
        cmd = self.msg_handler.send_command(MsgName.OUT2, [str(enabled).lower()])
        if cmd.wait_for_response():
            return cmd.response.arguments[0]
        return None

    def get_time(self):
        rqst = self.msg_handler.send_request(MsgName.TIME)
        if rqst.wait_for_response():
            return rqst.response.arguments[0]
        return None

    def set_alarm(self, unix_time):
        cmd = self.msg_handler.send_command(MsgName.ALARM, [unix_time])
        if cmd.wait_for_response():
            return cmd.response.arguments[0]
        return None

    def test_logs(self):
        rqst = self.msg_handler.send_request(MsgName.LOG)
        if rqst.wait_for_response():
            for logline in reversed(rqst.response.multipart_args):
                logdate = datetime.fromtimestamp(int(logline[0]))
                batv = float(logline[1])/100.0
                logmessage = logmsgs[int(logline[2])]
                print(F"::{logdate:%Y-%m-%d %H:%M:%S}:: {batv:.2f}V :: {logmessage}")
        return None

    def test(self):
        print("Testing companion board...")
        print(F"Current RTC time is {self.get_time()}")
        print(F"Current BatV is {self.get_batv()}")
        print(F"Current BatI is {self.get_bati()}")
        print("Turning on Out1 for 1 second")
        self.set_out1(True)
        time.sleep(1)
        self.set_out1(False)
        print("Turning on Out2 for 1 second")
        self.set_out2(True)
        time.sleep(1)
        self.set_out2(False)

        print("Enabling auxilliary 5V")
        self.set_aux5v(True)

        print("Sweeping PWM1 from 1000us to 2000us")
        self.set_pwm1(True, 1000)
        time.sleep(1)
        self.set_pwm1(True, 2000)
        time.sleep(1)
        self.set_pwm1(False, 1000)

        print("Sweeping PWM2 from 1000us to 2000us")
        self.set_pwm2(True, 1000)
        time.sleep(1)
        self.set_pwm2(True, 2000)
        time.sleep(1)
        self.set_pwm2(False, 1000)
        self.set_aux5v(False)
        print("Test finished")

        return None