From b8586837c3da4858e22956e4fbfb8ab010d6dbf9 Mon Sep 17 00:00:00 2001
From: Pierrick C <arofarn@arofarn.info>
Date: Sun, 29 Jul 2018 16:19:44 +0200
Subject: [PATCH] Add Feather M0 internal RTC support

---
 circuitpython/main.py | 41 +++++++++++++++++++++++++++--------------
 1 file changed, 27 insertions(+), 14 deletions(-)

diff --git a/circuitpython/main.py b/circuitpython/main.py
index ca14a7e..43ac286 100644
--- a/circuitpython/main.py
+++ b/circuitpython/main.py
@@ -6,13 +6,16 @@
 print_data = True
 data_to_neopixel = True
 gps_enable = True
-update_interval = 5.0   # in seconds
+update_interval = 5   # in seconds
 send_json_data = True
+datetime_format = "{:04}/{:02}/{:02}_{:02}:{:02}:{:02}"
 
 #######################
 
-import board, time, microcontroller
-import gc, micropython, os
+import board, microcontroller
+import gc, os
+# import micropython
+import time, rtc
 from busio import I2C, UART
 from analogio import AnalogIn
 
@@ -25,15 +28,19 @@ import neopixel
 ###########
 
 class Data:
-    """Class for handling data format and transmission"""
+    """Class for handling data"""
     def __init__(self):
         self.data = {}
 
     def update(self):
         """Read the data from various sensors and update the data dict variable"""
         #Data from Feather board
-        self.data['SYS'] = {'v_bat': { 'val': vbat.value*0.000100708, 'unit': 'V' },
-                       'CPU_temp': { 'val': microcontroller.cpu.temperature, 'unit': '°C' }}
+        self.data['SYS'] = {'time': {'val': datetime_format.format(*clock.datetime[0:6]),
+                                     'unit': '' },
+                            'v_bat': {'val': vbat.value*0.000100708,
+                                      'unit': 'V' },
+                            'CPU_temp': {'val': microcontroller.cpu.temperature,
+                                         'unit': '°C' }}
         # Note about v_bat calculation :
         # 0.000100708 = 2*3.3/65536 with
         #  2 : voltage is divided by 2
@@ -46,16 +53,17 @@ class Data:
                                'press': { 'val': bme280.pressure, 'unit': 'hPa' }}
         if gps_enable:
             if gps.has_fix:
-                self.data['GPS'] = {'timestamp': '{:04}/{:02}/{:02} {:02}:{:02}:{:02}'.format(gps.timestamp_utc.tm_year,
-                                                                                              gps.timestamp_utc.tm_mon,
-                                                                                              gps.timestamp_utc.tm_mday,
-                                                                                              gps.timestamp_utc.tm_hour,
-                                                                                              gps.timestamp_utc.tm_min,
-                                                                                              gps.timestamp_utc.tm_sec),
+                self.data['GPS'] = {'timestamp': {'val': datetime_format.format(gps.timestamp_utc.tm_year,
+                                                                                gps.timestamp_utc.tm_mon,
+                                                                                gps.timestamp_utc.tm_mday,
+                                                                                gps.timestamp_utc.tm_hour,
+                                                                                gps.timestamp_utc.tm_min,
+                                                                                gps.timestamp_utc.tm_sec),
+                                                  'unit': ''},
                                     'lat': {'val': gps.latitude, 'unit': 'deg'},
                                     'lon': {'val': gps.longitude, 'unit': 'deg'},
                                     'alt': {'val': gps.altitude_m, 'unit': 'm'},
-                                    'qual': {'val': gps.fix_quality, 'unit': None}}
+                                    'qual': {'val': gps.fix_quality, 'unit': ''}}
             else:
                 self.data['GPS'] = {'lat': {'val': None, 'unit': 'deg'},
                                     'lon': {'val': None, 'unit': 'deg'},
@@ -135,7 +143,11 @@ def update_neopixel(data):
 #########
 
 gc.collect()
-micropython.mem_info()
+#micropython.mem_info()
+
+#Enable RTC of the feather M0 board
+clock = rtc.RTC()
+clock.datetime = time.struct_time((2018, 7, 29, 15, 31, 30, 0, 0, 0))
 
 # BME280 sensors (I2C)
 i2c = I2C(board.SCL, board.SDA)
@@ -172,6 +184,7 @@ check_data_dir()
 
 data = Data()
 last_update = time.monotonic()
+
 while True:
 
     if gps_enable: