class Display(object):
IMG_DIR = '/flash/imgs'
def __init__(self, debug=False):
self.cfg = None
self.rtc = RTC()
self.debug = debug
self.battery = Battery()
# use this pin for debug
self.wifi_pin = Pin("GP24", mode=Pin.IN, pull=Pin.PULL_UP)
# Empty WDT object
self.wdt = None
if not debug:
if not self.wifi_pin():
self.wdt = WDT(timeout=20000)
self.sd = None
else:
from machine import SD
try:
self.sd = SD()
mount(self.sd, '/sd')
self.logfile = open("/sd/display.log", "a")
except OSError:
self.sd = None
self.logfile = None
self.epd = EPD()
self.log("Time left on the alarm: %dms" % self.rtc.alarm_left())
# Don't flash when we're awake outside of debug
heartbeat(self.debug)
def log(self, msg, end='\n'):
time = "%d, %d, %d, %d, %d, %d" % self.rtc.now()[:-2]
msg = time + ", " + msg
if self.logfile:
self.logfile.write(msg + end)
print(msg, end=end)
def feed_wdt(self):
if self.wdt:
self.wdt.feed()
def connect_wifi(self):
from network import WLAN
if not self.cfg:
raise ValueError("Can't initialise wifi, no config")
self.log('Starting WLAN, attempting to connect to ' + ','.join(self.cfg.wifi.keys()))
wlan = WLAN(0, WLAN.STA)
wlan.ifconfig(config='dhcp')
while not wlan.isconnected():
nets = wlan.scan()
for network in nets:
if network.ssid in self.cfg.wifi.keys():
self.log('Connecting to ' + network.ssid)
self.feed_wdt() # just in case
wlan.connect(ssid=network.ssid, auth=(network.sec, self.cfg.wifi[network.ssid]))
while not wlan.isconnected():
idle()
break
self.feed_wdt() # just in case
sleep_ms(2000)
self.log('Connected as %s' % wlan.ifconfig()[0])
@staticmethod
def reset_cause():
import machine
val = machine.reset_cause()
if val == machine.POWER_ON:
return "power"
elif val == machine.HARD_RESET:
return "hard"
elif val == machine.WDT_RESET:
return "wdt"
elif val == machine.DEEPSLEEP_RESET:
return "sleep"
elif val == machine.SOFT_RESET:
return "soft"
def set_alarm(self, now, json_metadata):
import json
json_dict = json.loads(json_metadata)
# Now we know the time too
self.rtc = RTC(datetime=now)
list_int = json_dict["wakeup"][:6]
time_str = ",".join([str(x) for x in list_int])
self.log("Setting alarm for " + time_str)
self.rtc.alarm(time=tuple(list_int))
if self.rtc.alarm_left() == 0:
self.log("Alarm failed, setting for +1 hour")
self.rtc.alarm(time=3600000)
del json
def display_file_image(self, file_obj):
towrite = 15016
max_chunk = 250
while towrite > 0:
c = max_chunk if towrite > max_chunk else towrite
buff = file_obj.read(c)
self.epd.upload_image_data(buff, delay_us=2000)
self.feed_wdt()
towrite -= c
self.epd.display_update()
def display_no_config(self):
self.log("Displaying no config msg")
with open(Display.IMG_DIR + '/no_config.bin', 'rb') as pic:
self.display_file_image(pic)
def display_low_battery(self):
self.log("Displaying low battery msg")
with open(Display.IMG_DIR + '/low_battery.bin', 'rb') as pic:
self.display_file_image(pic)
def display_cannot_connect(self):
self.log("Displaying no server comms msg")
with open(Display.IMG_DIR + '/no_server.bin', 'rb') as pic:
self.display_file_image(pic)
def display_no_wifi(self):
self.log("Displaying no wifi msg")
with open(Display.IMG_DIR + '/no_wifi.bin', 'rb') as pic:
self.display_file_image(pic)
def check_battery_level(self):
now_batt = 200
last_batt = self.battery.battery_raw()
while now_batt > last_batt:
sleep_ms(50)
last_batt = now_batt
self.feed_wdt()
now_batt = self.battery.battery_raw()
self.log("Battery value: %d (%d)" % (self.battery.value(), self.battery.battery_raw()))
if not self.battery.safe():
self.log("Battery voltage (%d) low! Turning off" % self.battery.battery_raw())
self.feed_wdt()
self.display_low_battery()
return False
else:
self.log("Battery value: %d (%d)" % (self.battery.value(), self.battery.battery_raw()))
return True
def run_deepsleep(self):
if not self.run():
# RTC wasn't set, try to sleep forever
self.rtc.alarm(time=2000000000)
# Set the wakeup (why do it earlier?)
rtc_i = self.rtc.irq(trigger=RTC.ALARM0, wake=DEEPSLEEP)
self.log("Going to sleep, waking in %dms" % self.rtc.alarm_left())
# Close files on the SD card
if self.sd:
self.logfile.close()
self.logfile = None
unmount('/sd')
self.sd.deinit()
# Turn the screen off
self.epd.disable()
if not self.wifi_pin():
# Basically turn off
deepsleep()
else:
self.log("DEBUG MODE: Staying awake")
pass
# Do nothing, allow network connections in
def run(self):
woken = self.wifi_pin()
self.epd.enable()
if not self.check_battery_level():
return False
try:
self.epd.get_sensor_data()
except ValueError:
self.log("Can't communicate with display, flashing light and giving up")
heartbeat(True)
sleep_ms(15000)
return True
if self.rtc.alarm_left() > 0:
self.log("Woken up but the timer is still running, refreshing screen only")
self.epd.display_update()
self.feed_wdt()
return True
try:
self.cfg = Config.load(sd=self.sd)
self.log("Loaded config")
except (OSError, ValueError) as e:
self.log("Failed to load config: " + str(e))
self.display_no_config()
try:
self.connect_wifi()
except:
pass # everything
while True:
sleep_ms(10)
self.feed_wdt()
self.feed_wdt()
self.connect_wifi()
content = b''
try:
self.log("Connecting to server %s:%d" % (self.cfg.host, self.cfg.port))
c = Connect(self.cfg.host, self.cfg.port, debug=self.debug)
self.feed_wdt()
cause = Display.reset_cause()
if woken:
cause = "user"
self.log("Reset cause: " + cause)
if len(self.cfg.upload_path) > 0:
temp = self.epd.get_sensor_data() # we read this already
c.post(self.cfg.upload_path,
battery=self.battery.value(),
reset=cause,
screen=temp)
self.log("Fetching metadata from " + self.cfg.metadata_path)
metadata = c.get_quick(self.cfg.metadata_path, max_length=1024, path_type='json')
# This will set the time to GMT, not localtime
self.set_alarm(c.last_fetch_time, metadata)
self.feed_wdt()
del metadata
del self.battery
self.log("Fetching image from " + self.cfg.image_path)
self.epd.image_erase_frame_buffer()
self.feed_wdt()
length, socket = c.get_object(self.cfg.image_path)
if length != 15016:
raise ValueError("Wrong data size for image: %d" % length)
self.feed_wdt()
except (RuntimeError, ValueError, OSError) as e:
self.log("Failed to get remote info: " + str(e))
self.display_cannot_connect()
self.rtc.alarm(time=3600000)
return True
sleep_ms(1000) # How do we make the write to display more reliable?
self.feed_wdt()
self.log("Uploading to display")
self.display_file_image(socket)
c.get_object_done() # close off socket
if self.cfg.src == "sd":
# If we've got a working config from SD instead of flash
self.log("Transferring working config")
Config.transfer()
self.log("SUCCESS")
self.log("Finished. Mem free: %d" % gc.mem_free())
return True
