Demo PAH8011+HeartRate on nRF52

Dependencies:   mbed pixart_heart_rate_demo pixart_heart_rate_lib_keil_m4

Revision:
0:a6408c845aba
diff -r 000000000000 -r a6408c845aba system_clock.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/system_clock.cpp	Fri Oct 27 08:53:49 2017 +0000
@@ -0,0 +1,31 @@
+#include "system_clock.h"
+
+#include <mbed.h>
+
+
+static Ticker               g_ticker;
+static volatile uint64_t    g_sys_tick = 0;
+
+
+static void system_tick_handle(void)
+{
+    g_sys_tick++;
+}
+
+void system_clock_init()
+{
+    g_sys_tick = 0;
+    
+    g_ticker.attach(system_tick_handle, 0.001f);
+}
+
+uint64_t system_clock_get_tick()
+{
+    return g_sys_tick;
+}
+
+uint64_t system_clock_time_to_milliseconds(uint64_t time)
+{
+    return time;
+}
+