Add PNVRAM support to avoid forgetting the time during a reboot.

4 files changed, 15 insertions, 3 deletions

diff --git a/TODO.md b/TODO.md
index 982a4b9..af655b3 100644
--- a/TODO.md
+++ b/TODO.md
@@ -47,7 +47,7 @@ applications.
 ### Bootloader
 
  * [X] OTA bootloader update
- * [ ] RTC time measurement whilst in bootloader
+ * [X] RTC time measurement whilst in bootloader
 
 ### MicroPython
 
diff --git a/bootloader b/bootloader
-Subproject 7786926950902cf4ce49a93894f69a205d6fd32
+Subproject d8d7d76b17e188420f66705f0b319f6e80a328f
diff --git a/micropython b/micropython
-Subproject 5424de70d7cfb1d53828b54cd1df509c3f0fee7
+Subproject 8ea321106823866adcb6c4881b4045939b56cc3
diff --git a/wasp/drivers/nrf_rtc.py b/wasp/drivers/nrf_rtc.py
index 63a2a51..0ff2c1f 100644
--- a/wasp/drivers/nrf_rtc.py
+++ b/wasp/drivers/nrf_rtc.py
@@ -3,6 +3,7 @@
 
 """ Real Time Clock based on the nRF-family low power counter """
 
+import machine
 import time
 
 #class Stim(object):
@@ -20,8 +21,17 @@ class RTC(object):
 
     def __init__(self, counter):
         self.counter = counter
-        self._uptime = 0
-        self.set_localtime((2020, 3, 1, 3, 0, 0, 0, 0))
+
+	if machine.mem32[0x200039c0] == 0x1abe11ed and \
+	   machine.mem32[0x200039dc] == 0x10adab1e:
+            self.lastcount = self.counter.counter()
+	    self.offset = machine.mem32[0x200039c4]
+	    self._uptime = machine.mem32[0x200039c8] // 125
+	else:
+	    machine.mem32[0x200039c0] = 0x1abe11ed
+	    machine.mem32[0x200039dc] = 0x10adab1e
+	    self._uptime = 0
+	    self.set_localtime((2020, 3, 1, 3, 0, 0, 0, 0))
 
     def update(self):
         newcount = self.counter.counter()
@@ -34,6 +44,7 @@ class RTC(object):
         self.lastcount += split
         self.lastcount &= (1 << 24) - 1   
         self._uptime += split
+        machine.mem32[0x200039c8] = self._uptime * 125
 
         return True
 
@@ -52,6 +63,7 @@ class RTC(object):
 
         lt = time.mktime(t)
         self.offset = lt - (self._uptime >> 3)
+        machine.mem32[0x200039c4] = self.offset
 
     def get_localtime(self):
         self.update()