From 6d95edc9bcf9660f6dde4088c561b7845be01cba Mon Sep 17 00:00:00 2001
From: Peter Hinch <peter@hinch.me.uk>
Date: Sat, 26 Dec 2015 06:57:32 +0000
Subject: [PATCH] Build check added

---
 README.md                |  6 ++++++
 buildcheck/buildcheck.py | 12 ++++++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 buildcheck/buildcheck.py

diff --git a/README.md b/README.md
index dadc4b1..55cb3fd 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,12 @@ A place for assorted code ideas for MicroPython.
 mutex: A class providing mutal exclusion enabling interrupt handlers and the main program to
 access shared data in a manner which ensures data integrity.
 
+watchdog: How to access the simpler of the Pyboard's watchdog timers.
+
+radio: A trivial class simplifying the use of the nRF24L01 radio for the case where a wireless
+link between two devices is required.
+
+Buildcheck: Raise an exception if a firmware build is earlier than a given date.
 
 Any code placed here is released under the MIT License (MIT).  
 The MIT License (MIT)  
diff --git a/buildcheck/buildcheck.py b/buildcheck/buildcheck.py
new file mode 100644
index 0000000..28c5630
--- /dev/null
+++ b/buildcheck/buildcheck.py
@@ -0,0 +1,12 @@
+# Raise an exception if a firmware build is earlier than a given date
+# buildcheck((2015,10,9))
+def buildcheck(tupTarget):
+    fail = True
+    if 'uname' in dir(os):
+        datestring = os.uname()[3]
+        date = datestring.split(' on')[1]
+        idate = tuple([int(x) for x in date.split('-')])
+        fail = idate < tupTarget
+    if fail:
+        raise OSError('This driver requires a firmware build dated {:4d}-{:02d}-{:02d} or later'.format(*tupTarget))
+