Eduardo de Mier / Arduino

Arduino functions millis, micros and eventually some more to come

Dependents:   DigitalCamera_OV5642_WIZwiki-W7500 BMC F746NG_TestAll Prelude_OV5642_dev

Arduino basic compatibility millis(), micros(), evtl. more to come.

micros() and millis() are uint32_t and have a correct overflow at 2^32-1. micros() has a granularity/resolution of 50. This can be changed by a define. 1 microsecond is not realistic because every count needs an irq. A resolution of 50 microseconds means 20KHz irq. That should not take away more than 1 percent overall processing time.

Diff: millis.cpp

Revision:
1:d1b960698e70
Parent:
0:571ea8a1bbae
--- a/millis.cpp	Mon Nov 24 17:02:21 2014 +0000
+++ b/millis.cpp	Thu Mar 26 14:21:36 2015 +0000
@@ -1,15 +1,49 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2014 calima engineering
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
 // millis as in Arduino...
 
 #include "mbed.h"
 #include "millis.h"
 
+#ifdef DEBUG_MILLIS
+#if DEBUG_MILLIS
+DigitalOut DebugMillisPin(D2);
+#endif
+#endif
+
 static volatile uint32_t MilliSeconds_u32;
 
 static  Ticker MilliSecondsTicker;
 
 static void MilliSecondsTickerIRQ()
 {
-    MilliSeconds_u32 ++;
+#ifdef DEBUG_MILLIS
+#if DEBUG_MILLIS
+    DebugMillisPin = not DebugMillisPin;
+#endif
+#endif
+    MilliSeconds_u32++;
 }
 
 uint32_t millis ()