diff options
Diffstat (limited to 'Projects/P-NUCLEO-WB55.Nucleo/Applications/Thread/Thread_SED_Coap_FreeRTOS/Core/Src/freertos_port.c')
| -rw-r--r-- | Projects/P-NUCLEO-WB55.Nucleo/Applications/Thread/Thread_SED_Coap_FreeRTOS/Core/Src/freertos_port.c | 85 |
1 files changed, 41 insertions, 44 deletions
diff --git a/Projects/P-NUCLEO-WB55.Nucleo/Applications/Thread/Thread_SED_Coap_FreeRTOS/Core/Src/freertos_port.c b/Projects/P-NUCLEO-WB55.Nucleo/Applications/Thread/Thread_SED_Coap_FreeRTOS/Core/Src/freertos_port.c index 2a6bf7141..477274cbe 100644 --- a/Projects/P-NUCLEO-WB55.Nucleo/Applications/Thread/Thread_SED_Coap_FreeRTOS/Core/Src/freertos_port.c +++ b/Projects/P-NUCLEO-WB55.Nucleo/Applications/Thread/Thread_SED_Coap_FreeRTOS/Core/Src/freertos_port.c @@ -1,19 +1,18 @@ /* USER CODE BEGIN Header */ /** - ****************************************************************************** - * File Name : freertos_port.c - * Description : Custom porting of FreeRTOS functionalities - * - ****************************************************************************** + ****************************************************************************** + * File Name : freertos_port.c + * Description : Custom porting of FreeRTOS functionalities + * + ****************************************************************************** * @attention * - * <h2><center>© Copyright (c) 2020 STMicroelectronics. - * All rights reserved.</center></h2> + * Copyright (c) 2019-2021 STMicroelectronics. + * All rights reserved. * - * This software component is licensed by ST under Ultimate Liberty license - * SLA0044, the "License"; You may not use this file except in compliance with - * the License. You may obtain a copy of the License at: - * www.st.com/SLA0044 + * This software is licensed under terms that can be found in the LICENSE file + * in the root directory of this software component. + * If no LICENSE file comes with this software, it is provided AS-IS. * ****************************************************************************** */ @@ -25,11 +24,11 @@ #include "FreeRTOS.h" #include "task.h" #include "stm32_lpm.h" +#include <limits.h> /* Private typedef -----------------------------------------------------------*/ typedef struct { - uint64_t LpTimeDiffVal; uint32_t LpTimeLeftOnEntry; uint8_t LpTimerFreeRTOS_Id; } LpTimerContext_t; @@ -201,7 +200,6 @@ void vPortSetupTimerInterrupt( void ) static void LpTimerInit( void ) { ( void ) HW_TS_Create(CFG_TIM_PROC_ID_ISR, &(LpTimerContext.LpTimerFreeRTOS_Id), hw_ts_SingleShot, LpTimerCb); - LpTimerContext.LpTimeDiffVal = 0; return; } @@ -236,13 +234,15 @@ static void LpTimerStart( uint32_t time_to_sleep ) uint64_t time; /* Converts the number of FreeRTOS ticks into hw timer tick */ - - time = (time_to_sleep * 1000LL * 1000LL ); - time = time / ( CFG_TS_TICK_VAL * configTICK_RATE_HZ ); - - if(time > 0xFFFF0000) + if (time_to_sleep > (ULLONG_MAX / 1e12)) /* Prevent overflow in else statement */ { - time = 0xFFFF0000; /* maximum value */ + time = 0xFFFF0000; /* Maximum value equal to 24 days */ + } + else + { + /* The result always fits in uint32_t and is always less than 0xFFFF0000 */ + time = time_to_sleep * 1000000000000ULL; + time = (uint64_t)( time / ( CFG_TS_TICK_VAL_PS * configTICK_RATE_HZ )); } HW_TS_Start(LpTimerContext.LpTimerFreeRTOS_Id, (uint32_t)time); @@ -284,31 +284,30 @@ static void LpEnter( void ) #if ( CFG_LPM_SUPPORTED != 0) static uint32_t LpGetElapsedTime( void ) { - uint64_t val_ticks, time_us, diff_ps; - uint32_t LpTimeLeftOnExit, time2_us; + uint64_t val_ticks, time_ps; + uint32_t LpTimeLeftOnExit; LpTimeLeftOnExit = HW_TS_RTC_ReadLeftTicksToCount(); - time_us = (CFG_TS_TICK_VAL) * (uint64_t)(LpTimerContext.LpTimeLeftOnEntry - LpTimeLeftOnExit); - - /* Corrects the time precision lost in CFG_TS_TICK_VAL computation */ - - /* Compute the amount of pico seconds lost at each TS ticks */ - diff_ps = DIVR( ((uint64_t)CFG_RTCCLK_DIV * 1000000 * 1000000), (uint64_t)LSE_VALUE ); - diff_ps -= DIVF( (CFG_RTCCLK_DIV * 1000000), LSE_VALUE ) * 1000000; - /* Compute the total amount of time shift */ - diff_ps *= (uint64_t)(LpTimerContext.LpTimeLeftOnEntry - LpTimeLeftOnExit); - - /* Save the time shift for next time */ - LpTimerContext.LpTimeDiffVal += diff_ps; - - /* Reports the time difference into returned time elapsed value */ - time2_us = LpTimerContext.LpTimeDiffVal / (1000ULL * 1000ULL); - LpTimerContext.LpTimeDiffVal = LpTimerContext.LpTimeDiffVal - time2_us * (1000ULL * 1000ULL); - time_us += time2_us; - - /* Convert uS time into OS ticks */ - val_ticks = time_us * configTICK_RATE_HZ; - val_ticks = val_ticks / (1000 * 1000); + /* This cannot overflow. Max result is ~ 1.6e13 */ + time_ps = (uint64_t)((CFG_TS_TICK_VAL_PS) * (uint64_t)(LpTimerContext.LpTimeLeftOnEntry - LpTimeLeftOnExit)); + + /* time_ps can be less than 1 RTOS tick in following situations + * a) MCU didn't go to STOP2 due to wake-up unrelated to Timer Server or woke up from STOP2 very shortly after. + * Advancing RTOS clock by 1 FreeRTOS tick doesn't hurt in this case. + * b) vPortSuppressTicksAndSleep(xExpectedIdleTime) was called with xExpectedIdleTime = 2 which is minimum value defined by configEXPECTED_IDLE_TIME_BEFORE_SLEEP. + * The xExpectedIdleTime is decremented by one RTOS tick to wake-up in advance. + * Ex: RTOS tick is 1ms, the timer Server wakes the MCU in ~977 us. RTOS clock should be advanced by 1 ms. + * */ + if(time_ps <= (1e12 / configTICK_RATE_HZ)) /* time_ps < RTOS tick */ + { + val_ticks = 1; + } + else + { + /* Convert pS time into OS ticks */ + val_ticks = time_ps * configTICK_RATE_HZ; /* This cannot overflow. Max result is ~ 1.6e16 */ + val_ticks = (uint64_t)(val_ticks / (1e12)); /* The result always fits in uint32_t */ + } /** * The system may have been out from another reason than the timer @@ -321,5 +320,3 @@ static uint32_t LpGetElapsedTime( void ) return (uint32_t)val_ticks; } #endif - -/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ |