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.

Files at this revision

API Documentation at this revision

Revision 2:215810c8e89e, committed 2015-03-27

Comitter:
eduardoG26
Date:
Fri Mar 27 15:36:20 2015 +0000
Parent:
1:d1b960698e70
Child:
3:abbc3308dfa1
Commit message:
Added: micros()

Changed in this revision

Arduino.cpp Show annotated file Show diff for this revision Revisions of this file
Arduino.h Show annotated file Show diff for this revision Revisions of this file
millis.cpp Show diff for this revision Revisions of this file
millis.h Show diff for this revision Revisions of this file 
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Arduino.cpp	Fri Mar 27 15:36:20 2015 +0000
@@ -0,0 +1,74 @@
+/*
+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 "Arduino.h"
+
+#ifdef DEBUG_MILLIS
+#if DEBUG_MILLIS
+DigitalOut DebugMillisPin(D2);
+#endif
+#endif
+
+// Period of IRQ in µs. This is the minimum (!) granularity of micros().
+#define TICKER_PERIOD_US (32uL)
+
+static volatile uint32_t MilliSeconds_u32, MicroSeconds_u32, MicroSecondsLast_u32;
+
+static  Ticker ArduinoTicker;
+
+static void TickerIRQ()
+{
+#ifdef DEBUG_MILLIS
+#if DEBUG_MILLIS
+    DebugMillisPin = not DebugMillisPin;
+#endif
+#endif
+    MicroSeconds_u32 += TICKER_PERIOD_US;
+    if ((MicroSeconds_u32 - MicroSecondsLast_u32) >= 1000uL) {
+        MilliSeconds_u32++;
+        MicroSecondsLast_u32 += 1000uL;
+    }
+}
+
+uint32_t millis ()
+{
+    // Not critical since variable is atomic
+    return MilliSeconds_u32;
+}
+
+uint32_t micros ()
+{
+    // Not critical since variable is atomic
+    return MicroSeconds_u32;
+}
+
+void StartArduinoTimer ()
+{
+    //arduino_timer.start();
+    ArduinoTicker.attach_us (&TickerIRQ, TICKER_PERIOD_US);
+}
+
+// End of file
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Arduino.h	Fri Mar 27 15:36:20 2015 +0000
@@ -0,0 +1,51 @@
+/*
+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.
+*/
+
+#ifndef ARDUINO_H_
+#define ARDUINO_H_
+
+#include "mbed.h"
+
+// Get millis value similar to arduino
+uint32_t millis ();
+
+// Get micros value similar to arduino
+uint32_t micros ();
+
+// Must be called to start timer!
+void StartArduinoTimer ();
+
+/** Macro for delay() 
+ *
+ * @param void
+ */
+#define delay(x)                  (wait_ms(x))
+/** Macro for delayMicroseconds()  
+ *
+ * @param void
+ */
+#define delayMicroseconds(x)      (wait_us(x))
+ 
+#endif  // See #ifndef ARDUINO_H_
+// End of file
\ No newline at end of file

--- a/millis.cpp	Thu Mar 26 14:21:36 2015 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,59 +0,0 @@
-/*
-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()
-{
-#ifdef DEBUG_MILLIS
-#if DEBUG_MILLIS
-    DebugMillisPin = not DebugMillisPin;
-#endif
-#endif
-    MilliSeconds_u32++;
-}
-
-uint32_t millis ()
-{
-    return MilliSeconds_u32;
-}
-
-void StartMillis ()
-{
-    MilliSecondsTicker.attach_us (&MilliSecondsTickerIRQ, 1000);
-}
-
-// End of file
\ No newline at end of file

--- a/millis.h	Thu Mar 26 14:21:36 2015 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,40 +0,0 @@
-/*
-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...
-
-#ifndef MILLIS_H_
-#define MILLIS_H_
-
-#include "mbed.h"
-#include "project.h"
-
-// Get millis value similar to arduino
-uint32_t millis ();
-
-// Must be called to start milliseconds timer!
-void StartMillis ();
-
-#endif  // See #ifndef MILLIS_H_
-// End of file
\ No newline at end of file