Add support and tests for extended RTC

TESTS/host_tests/rtc_calc_auto.py

@@ -0,0 +1,138 @@
+"""
+mbed SDK
+Copyright (c) 2011-2013 ARM Limited
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+"""
+
+from mbed_host_tests import BaseHostTest
+import time
+import calendar
+import datetime
+
+class RTC_time_calc_test(BaseHostTest):
+    """
+    This is the host part of the test to verify if:
+    - _rtc_mktime function converts a calendar time into time since UNIX epoch as a time_t,
+    - _rtc_localtime function converts a given time in seconds since epoch into calendar time.
+
+    The same algoritm to generate next calendar time to be tested is used by both parts of the test.
+    We will check if correct time since UNIX epoch is calculated for the first and the last day
+    of each month and across valid years.
+
+    Mbed part of the test sends calculated time since UNIX epoch.
+    This part validates given value and responds to indicate pass or fail.
+    Additionally it sends also encoded day of week and day of year which
+    will be needed to verify _rtc_localtime.
+
+    Support for both types of RTC devices is provided:
+    - RTCs which handles all leap years in the mentioned year range correctly. Leap year is determined by checking if
+      the year counter value is divisible by 400, 100, and 4. No problem here.
+    - RTCs which handles leap years correctly up to 2100. The RTC does a simple bit comparison to see if the two
+      lowest order bits of the year counter are zero. In this case 2100 year will be considered
+      incorrectly as a leap year, so the last valid point in time will be 28.02.2100 23:59:59 and next day will be
+      29.02.2100 (invalid). So after 28.02.2100 the day counter will be off by a day.
+
+    """
+
+    edge_date = datetime.datetime(2100, 2, 28, 0, 0, 0)
+
+    years = [1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980,
+             2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
+             2099, 2100, 2101, 2102, 2103, 2104, 2105, 2106]
+    year_id = 0
+
+
+
+    full_leap_year_support = False
+
+    RTC_FULL_LEAP_YEAR_SUPPORT = 0
+    RTC_PARTIAL_LEAP_YEAR_SUPPORT = 1
+
+    def _set_leap_year_support(self, key, value, timestamp):
+        if (int(value) == self.RTC_FULL_LEAP_YEAR_SUPPORT):
+            self.full_leap_year_support = True
+        else:
+            self.full_leap_year_support = False
+
+        self.first = True
+        self.date = datetime.datetime(1970, 1, 1, 23, 0, 0)
+        self.year_id = 0
+
+    def _verify_timestamp(self, key, value, timestamp):
+        # week day in python is counted from sunday(0) and on mbed side week day is counted from monday(0).
+        # year day in python is counted from 1 and on mbed side year day is counted from 0.
+        week_day = ((self.date.timetuple().tm_wday + 1) % 7)
+        year_day = self.date.timetuple().tm_yday - 1
+
+        # Fix for RTC which not have full leap year support.
+        if (not self.full_leap_year_support):
+            if self.date >= self.edge_date:
+                # After 28.02.2100 we should be one day off - add this day and store original
+                date_org = self.date
+                self.date += datetime.timedelta(days = 1)
+
+                # Adjust week day.
+                week_day = ((self.date.timetuple().tm_wday + 1) % 7)
+
+                # Adjust year day.
+                if (self.date.year == 2100):
+                    year_day = self.date.timetuple().tm_yday - 1
+                else:
+                    year_day = date_org.timetuple().tm_yday - 1
+
+                # Last day in year
+                if (self.date.month == 1 and self.date.day == 1):
+                    if (self.date.year == 2101):
+                        # Exception for year 2100 - ivalid handled by RTC without full leap year support
+                        year_day = 365
+                    else:
+                        year_day = date_org.timetuple().tm_yday - 1
+
+        t = (self.date.year , self.date.month, self.date.day, self.date.hour, self.date.minute, self.date.second, 0, 0, 0)
+
+        expected_timestamp = calendar.timegm(t)
+        actual_timestamp = int(value) & 0xffffffff # convert to unsigned int
+
+        # encode week day and year day in the response
+        response = (week_day << 16) | year_day
+
+        if (actual_timestamp == expected_timestamp):
+            # response contains encoded week day and year day
+            self.send_kv("passed", str(response))
+        else:
+            self.send_kv("failed", 0)
+            print "expected = %d, result = %d" %  (expected_timestamp , actual_timestamp)
+
+        # calculate next date
+        if (self.first):
+            days_range = calendar.monthrange(self.date.year, self.date.month)
+            self.date = self.date.replace(day = days_range[1], minute = 59, second = 59)
+            self.first = not self.first
+        else:
+            self.date += datetime.timedelta(days = 1)
+            if (self.date.month == 1):
+                self.year_id += 1
+                self.date = self.date.replace(year = self.years[self.year_id])
+            self.date = self.date.replace(day = 1, minute = 0, second = 0)
+            self.first = not self.first
+
+    def setup(self):
+        self.register_callback('timestamp', self._verify_timestamp)
+        self.register_callback('leap_year_setup', self._set_leap_year_support)
+
+    def result(self):
+        return self.__result
+
+    def teardown(self):
+        pass