Diff: dn_time.cpp

Revision:

0:8ca1e814a851

diff -r 000000000000 -r 8ca1e814a851 dn_time.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dn_time.cpp	Wed May 02 09:26:10 2018 +0000
@@ -0,0 +1,53 @@
+/*
+Copyright (c) 2016, Dust Networks. All rights reserved.
+
+Port of the time module to the NUCLEO-L053R8.
+
+\license See attached DN_LICENSE.txt.
+*/
+
+#include "dn_time.h"
+#include "mbed.h"
+#include "millis.h"
+#include "dn_debug.h"
+
+//=========================== defines =========================================
+
+
+//=========================== variables =======================================
+
+
+//=========================== prototypes ======================================
+
+
+//=========================== public ==========================================
+
+uint32_t dn_time_ms(void)
+{
+	/*
+	A simple library that utilize SysTick is used instead of the mbed Timer
+	class, as the latter is based on 32-bit microsecond counter and thus
+	overflows long before 32-bits of milliseconds are used.
+	*/
+	uint32_t ms = millis();
+	return ms;
+}
+
+void dn_sleep_ms(uint32_t milliseconds)
+{
+	 /*
+	 A simple delay is used for simplicity in this example.
+	 To save power, we could instead have initialized a timer to fire an
+	 interrupt after the set number of milliseconds, followed by entering
+	 a low-power sleep mode. Upon wake up, we would have to check that we
+	 were indeed woken by said interrupt (and e.g. not an USART interrupt)
+	 to decide if we should go back to sleep or not.
+	 */
+	 wait_ms(milliseconds);
+}
+
+//=========================== private =========================================
+
+
+//=========================== helpers =========================================
+