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arm_hal_timer.cpp
00001 // ---------------------------------------------------------------------------- 00002 // Copyright 2016-2017 ARM Ltd. 00003 // 00004 // SPDX-License-Identifier: Apache-2.0 00005 // 00006 // Licensed under the Apache License, Version 2.0 (the "License"); 00007 // you may not use this file except in compliance with the License. 00008 // You may obtain a copy of the License at 00009 // 00010 // http://www.apache.org/licenses/LICENSE-2.0 00011 // 00012 // Unless required by applicable law or agreed to in writing, software 00013 // distributed under the License is distributed on an "AS IS" BASIS, 00014 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00015 // See the License for the specific language governing permissions and 00016 // limitations under the License. 00017 // ---------------------------------------------------------------------------- 00018 00019 // Include before mbed.h to properly get UINT*_C() 00020 #include "ns_types.h" 00021 00022 #include "pal.h" 00023 #include "pal_rtos.h" 00024 00025 #include "platform/arm_hal_timer.h" 00026 #include "platform/arm_hal_interrupt.h" 00027 00028 #include <assert.h> 00029 00030 // Low precision platform tick timer variables 00031 static void (*tick_timer_callback)(void); 00032 static palTimerID_t tick_timer_id; 00033 #define TICK_TIMER_ID 1 00034 00035 void timer_callback(void const *funcArgument) 00036 { 00037 (void)funcArgument; 00038 if (tick_timer_callback != NULL) { 00039 tick_timer_callback(); 00040 } 00041 } 00042 00043 #ifdef MBED_CONF_NANOSTACK_EVENTLOOP_EXCLUDE_HIGHRES_TIMER 00044 extern "C" int8_t ns_timer_sleep(void); 00045 #endif 00046 00047 // static method for creating the timer, called implicitly by platform_tick_timer_register if 00048 // timer was not enabled already 00049 static void tick_timer_create(void) 00050 { 00051 palStatus_t status; 00052 status = pal_init(); 00053 assert(PAL_SUCCESS == status); 00054 status = pal_osTimerCreate(timer_callback, NULL, palOsTimerPeriodic , &tick_timer_id); 00055 assert(PAL_SUCCESS == status); 00056 00057 } 00058 00059 // Low precision platform tick timer 00060 int8_t platform_tick_timer_register(void (*tick_timer_cb_handler)(void)) 00061 { 00062 if (tick_timer_id == 0) { 00063 tick_timer_create(); 00064 } 00065 tick_timer_callback = tick_timer_cb_handler; 00066 return TICK_TIMER_ID; 00067 } 00068 00069 int8_t platform_tick_timer_start(uint32_t period_ms) 00070 { 00071 int8_t retval = -1; 00072 if ((tick_timer_id != 0) && (PAL_SUCCESS == pal_osTimerStart(tick_timer_id, period_ms))) { 00073 retval = 0; 00074 } 00075 return retval; 00076 } 00077 00078 int8_t platform_tick_timer_stop(void) 00079 { 00080 int8_t retval = -1; 00081 if ((tick_timer_id != 0) && (PAL_SUCCESS == pal_osTimerStop(tick_timer_id))) { 00082 retval = 0; 00083 } 00084 00085 // release PAL side resources 00086 pal_osTimerDelete(&tick_timer_id); 00087 pal_destroy(); 00088 00089 return retval; 00090 } 00091 00092
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