minar_hal_timer.cpp

00001 /*
00002  * Copyright (c) 2016 ARM Limited, All Rights Reserved
00003  */
00004 
00005 // Include before mbed.h to properly get UINT*_C()
00006 
00007 #include "ns_types.h"
00008 
00009 #include "platform/arm_hal_timer.h"
00010 #include "platform/arm_hal_interrupt.h"
00011 
00012 #if defined(NS_EVENTLOOP_USE_TICK_TIMER) && defined(YOTTA_CFG_MINAR)
00013 
00014 #include "minar/minar.h"
00015 #include "mbed-drivers/mbed.h"
00016 #include "core-util/FunctionPointer.h"
00017 #include "core-util/Event.h"
00018 
00019 #define TICK_TIMER_ID   1
00020 
00021 using minar::Scheduler;
00022 using minar::milliseconds;
00023 using minar::callback_handle_t;
00024 using namespace mbed::util;
00025 
00026 static callback_handle_t sys_timer_handle;
00027 static void (*tick_timer_callback)(void);
00028 
00029 void timer_callback(void const *funcArgument)
00030 {
00031     (void)funcArgument;
00032     if (NULL != tick_timer_callback) {
00033         tick_timer_callback();
00034     }
00035 }
00036 
00037 // Low precision platform tick timer
00038 int8_t platform_tick_timer_register(void (*tick_timer_cb_handler)(void))
00039 {
00040     tick_timer_callback = tick_timer_cb_handler;
00041     return TICK_TIMER_ID;
00042 }
00043 
00044 int8_t platform_tick_timer_start(uint32_t period_ms)
00045 {
00046     int8_t retval = -1;
00047     if (sys_timer_handle != NULL) {
00048         return 0; // Timer already started already so return success
00049     }
00050     Event e = FunctionPointer1<void, void const *>(timer_callback).bind(NULL);
00051     if (e != NULL) {
00052         sys_timer_handle = Scheduler::postCallback(e).period(milliseconds(period_ms)).getHandle();
00053         if (sys_timer_handle != NULL) {
00054             retval = 0;
00055         }
00056     }
00057     return retval;
00058 }
00059 
00060 int8_t platform_tick_timer_stop(void)
00061 {
00062     int8_t retval = -1;
00063     if (sys_timer_handle != NULL) {
00064         Scheduler::cancelCallback(sys_timer_handle);
00065         sys_timer_handle = NULL;
00066         retval = 0;
00067     }
00068     return retval;
00069 }
00070 
00071 #endif // defined(NS_EVENTLOOP_USE_TICK_TIMER) && defined(YOTTA_CFG)