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Diffstat (limited to 'Projects/P-NUCLEO-WB55.Nucleo/Applications/BLE/BLE_HeartRateFreeRTOS_ANCS/Core/Src/freertos_port.c')
| -rw-r--r-- | Projects/P-NUCLEO-WB55.Nucleo/Applications/BLE/BLE_HeartRateFreeRTOS_ANCS/Core/Src/freertos_port.c | 339 |
1 files changed, 339 insertions, 0 deletions
diff --git a/Projects/P-NUCLEO-WB55.Nucleo/Applications/BLE/BLE_HeartRateFreeRTOS_ANCS/Core/Src/freertos_port.c b/Projects/P-NUCLEO-WB55.Nucleo/Applications/BLE/BLE_HeartRateFreeRTOS_ANCS/Core/Src/freertos_port.c new file mode 100644 index 000000000..fec7382b3 --- /dev/null +++ b/Projects/P-NUCLEO-WB55.Nucleo/Applications/BLE/BLE_HeartRateFreeRTOS_ANCS/Core/Src/freertos_port.c @@ -0,0 +1,339 @@ +/* USER CODE BEGIN Header */ +/** + ****************************************************************************** + * File Name : freertos_port.c + * Description : Custom porting of FreeRTOS functionalities + * + ****************************************************************************** + * @attention + * + * <h2><center>© Copyright (c) 2020 STMicroelectronics. + * All rights reserved.</center></h2> + * + * 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 + * + ****************************************************************************** + */ +/* USER CODE END Header */ + +/* Includes ------------------------------------------------------------------*/ +#include "app_common.h" + +#include "FreeRTOS.h" +#include "task.h" +#include "stm32_lpm.h" + +/* Private typedef -----------------------------------------------------------*/ +typedef struct +{ + uint32_t LpTimeLeftOnEntry; + uint8_t LpTimerFreeRTOS_Id; +} LpTimerContext_t; + +/* Private defines -----------------------------------------------------------*/ +#ifndef configSYSTICK_CLOCK_HZ +#define configSYSTICK_CLOCK_HZ configCPU_CLOCK_HZ +/* Ensure the SysTick is clocked at the same frequency as the core. */ +#define portNVIC_SYSTICK_CLK_BIT ( 1UL << 2UL ) +#else +/* The way the SysTick is clocked is not modified in case it is not the same + as the core. */ +#define portNVIC_SYSTICK_CLK_BIT ( 0 ) +#endif + +#define CPU_CLOCK_KHZ ( configCPU_CLOCK_HZ / 1000 ) + +/* Constants required to manipulate the core. Registers first... */ +#define portNVIC_SYSTICK_CTRL_REG ( * ( ( volatile uint32_t * ) 0xe000e010 ) ) +#define portNVIC_SYSTICK_LOAD_REG ( * ( ( volatile uint32_t * ) 0xe000e014 ) ) +#define portNVIC_SYSTICK_CURRENT_VALUE_REG ( * ( ( volatile uint32_t * ) 0xe000e018 ) ) +#define portNVIC_SYSTICK_INT_BIT ( 1UL << 1UL ) +#define portNVIC_SYSTICK_ENABLE_BIT ( 1UL << 0UL ) +#define portNVIC_SYSTICK_COUNT_FLAG_BIT ( 1UL << 16UL ) + +/* Private macros ------------------------------------------------------------*/ +/* Private variables ---------------------------------------------------------*/ +/* + * The number of SysTick increments that make up one tick period. + */ +#if ( CFG_LPM_SUPPORTED != 0) +static uint32_t ulTimerCountsForOneTick; +static LpTimerContext_t LpTimerContext; +#endif + +/* Global variables ----------------------------------------------------------*/ +/* Private function prototypes -----------------------------------------------*/ +#if ( CFG_LPM_SUPPORTED != 0) +static void LpTimerCb( void ); +static void LpTimerInit( void ); +static void LpTimerStart( uint32_t time_to_sleep ); +static void LpEnter( void ); +static uint32_t LpGetElapsedTime( void ); +void vPortSetupTimerInterrupt( void ); +#endif +/* Functions Definition ------------------------------------------------------*/ + +/** + * @brief Implement the tickless feature + * + * + * @param: xExpectedIdleTime is given in number of FreeRTOS Ticks + * @retval: None + */ +void vPortSuppressTicksAndSleep( TickType_t xExpectedIdleTime ) +{ + /* If low power is not used, do not stop the SysTick and continue execution */ +#if ( CFG_LPM_SUPPORTED != 0) + /** + * Although this is not documented as such, when xExpectedIdleTime = 0xFFFFFFFF = (~0), + * it likely means the system may enter low power for ever ( from a FreeRTOS point of view ). + * Otherwise, for a FreeRTOS tick set to 1ms, that would mean it is requested to wakeup in 8 years from now. + * When the system may enter low power mode for ever, FreeRTOS is not really interested to maintain a + * systick count and when the system exits from low power mode, there is no need to update the count with + * the time spent in low power mode + */ + uint32_t ulCompleteTickPeriods; + + /* Stop the SysTick to avoid the interrupt to occur while in the critical section. + * Otherwise, this will prevent the device to enter low power mode + * At this time, an update of the systick will not be considered + * + */ + portNVIC_SYSTICK_CTRL_REG &= ~portNVIC_SYSTICK_ENABLE_BIT; + + /* Enter a critical section but don't use the taskENTER_CRITICAL() + method as that will mask interrupts that should exit sleep mode. */ + __disable_irq(); + __DSB(); + __ISB(); + + /* If a context switch is pending or a task is waiting for the scheduler + to be unsuspended then abandon the low power entry. */ + if( eTaskConfirmSleepModeStatus() == eAbortSleep ) + { + /* Restart SysTick. */ + portNVIC_SYSTICK_CTRL_REG |= portNVIC_SYSTICK_ENABLE_BIT; + + /* Re-enable interrupts - see comments above __disable_interrupt() + call above. */ + __enable_irq(); + } + else + { + if (xExpectedIdleTime != (~0)) + { + /* Remove one tick to wake up before the event occurs */ + xExpectedIdleTime--; + /* Start the low power timer */ + LpTimerStart( xExpectedIdleTime ); + } + + /* Enter low power mode */ + LpEnter( ); + + if (xExpectedIdleTime != (~0)) + { + /** + * Get the number of FreeRTOS ticks that has been suppressed + * In the current implementation, this shall be kept in critical section + * so that the timer server return the correct elapsed time + */ + ulCompleteTickPeriods = LpGetElapsedTime( ); + vTaskStepTick( ulCompleteTickPeriods ); + } + + /* Restart SysTick */ + portNVIC_SYSTICK_CURRENT_VALUE_REG = 0UL; + portNVIC_SYSTICK_CTRL_REG |= portNVIC_SYSTICK_ENABLE_BIT; + portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL; + + /* Exit with interrUpts enabled. */ + __enable_irq(); + } +#endif +} + +/* + * Setup the systick timer to generate the tick interrupts at the required + * frequency and initialize a low power timer + * The current implementation is kept as close as possible to the default tickless + * mode provided. + * The systick is still used when there is no need to go in low power mode. + * When the system needs to enter low power mode, the tick is suppressed and a low power timer + * is used over that time + * Note that in sleep mode, the system clock is still running and the default tickless implementation + * using systick could have been kept. + * However, as at that time, it is not yet known whereas the low power mode that will be used is stop mode or + * sleep mode, it is easier and simpler to go with a low power timer as soon as the tick need to be + * suppressed. + */ +#if ( CFG_LPM_SUPPORTED != 0) +void vPortSetupTimerInterrupt( void ) +{ + LpTimerInit( ); + + /* Calculate the constants required to configure the tick interrupt. */ + ulTimerCountsForOneTick = ( configSYSTICK_CLOCK_HZ / configTICK_RATE_HZ ); + + /* Stop and clear the SysTick. */ + portNVIC_SYSTICK_CTRL_REG = 0UL; + portNVIC_SYSTICK_CURRENT_VALUE_REG = 0UL; + + /* Configure SysTick to interrupt at the requested rate. */ + portNVIC_SYSTICK_LOAD_REG = ( configSYSTICK_CLOCK_HZ / configTICK_RATE_HZ ) - 1UL; + portNVIC_SYSTICK_CTRL_REG = ( portNVIC_SYSTICK_CLK_BIT | portNVIC_SYSTICK_INT_BIT | portNVIC_SYSTICK_ENABLE_BIT ); +} +#endif + +/** + * @brief The current implementation uses the hw_timerserver to provide a low power timer + * This may be replaced by another low power timer. + * + * @param None + * @retval None + */ +#if ( CFG_LPM_SUPPORTED != 0) +static void LpTimerInit( void ) +{ + ( void ) HW_TS_Create(CFG_TIM_PROC_ID_ISR, &(LpTimerContext.LpTimerFreeRTOS_Id), hw_ts_SingleShot, LpTimerCb); + + return; +} +#endif + +/** + * @brief Low power timer callback + * + * @param None + * @retval None + */ +#if ( CFG_LPM_SUPPORTED != 0) +static void LpTimerCb( void ) +{ + /** + * Nothing to be done + */ + + return; +} +#endif +/** + * @brief Request to start a low power timer ( running is stop mode ) + * + * @param time_to_sleep : Number of FreeRTOS ticks + * @retval None + */ +#if ( CFG_LPM_SUPPORTED != 0) +static void LpTimerStart( uint32_t time_to_sleep ) +{ + /* Converts the number of FreeRTOS ticks into hw timer tick */ + if(time_to_sleep <= 0x10C6) + { + /** + * ( time_to_sleep * 1000 * 1000 ) fit a 32bits word + */ + time_to_sleep = (time_to_sleep * 1000 * 1000 ); + time_to_sleep = time_to_sleep / ( CFG_TS_TICK_VAL * configTICK_RATE_HZ ); + } + else if(time_to_sleep <= 0x418937) + { + /** + * ( time_to_sleep * 1000 ) fit a 32bits word + */ + time_to_sleep = (time_to_sleep * 1000); + time_to_sleep = time_to_sleep / ( CFG_TS_TICK_VAL * configTICK_RATE_HZ ); + if(time_to_sleep <= 0x418937) + { + /** + * ( time_to_sleep * 1000 ) fit a 32bits word + */ + time_to_sleep = (time_to_sleep * 1000); + } + else + { + time_to_sleep = (~0); /* Max value */ + } + } + else + { + time_to_sleep = time_to_sleep / ( CFG_TS_TICK_VAL * configTICK_RATE_HZ ); + if(time_to_sleep <= 0x10C6) + { + /** + * ( time_to_sleep * 1000 * 1000 ) fit a 32bits word + */ + time_to_sleep = (time_to_sleep * 1000 * 1000 ); + } + else + { + time_to_sleep = (~0); /* Max value */ + } + } + + HW_TS_Start(LpTimerContext.LpTimerFreeRTOS_Id, time_to_sleep); + + /** + * There might be other timers already running in the timer server that may elapse + * before this one. + * Store how long before the next event so that on wakeup, it will be possible to calculate + * how long the tick has been suppressed + */ + LpTimerContext.LpTimeLeftOnEntry = HW_TS_RTC_ReadLeftTicksToCount( ); + + return; +} +#endif + +/** + * @brief Enter low power mode + * + * @param None + * @retval None + */ +#if ( CFG_LPM_SUPPORTED != 0) +static void LpEnter( void ) +{ +#if ( CFG_LPM_SUPPORTED == 1) + UTIL_LPM_EnterLowPower(); +#endif + return; +} +#endif + +/** + * @brief Read how long the tick has been suppressed + * + * @param None + * @retval The number of tick rate (FreeRTOS tick) + */ +#if ( CFG_LPM_SUPPORTED != 0) +static uint32_t LpGetElapsedTime( void ) +{ + uint64_t val_ticks, time_us; + + time_us = (CFG_TS_TICK_VAL) * (uint64_t)(LpTimerContext.LpTimeLeftOnEntry - HW_TS_RTC_ReadLeftTicksToCount( )); + + val_ticks = time_us * configTICK_RATE_HZ; + val_ticks = val_ticks / (1000 * 1000); + + /* add a tick if the time elapsed is above 50 % of a tick */ + if( (time_us % (portTICK_PERIOD_MS * 1000) > (portTICK_PERIOD_MS * 1000 / 2)) ) + { + val_ticks++; + } + + /** + * The system may have been out from another reason than the timer + * Stop the timer after the elapsed time is calculated other wise, HW_TS_RTC_ReadLeftTicksToCount() + * may return 0xFFFF ( TIMER LIST EMPTY ) + * It does not hurt stopping a timer that exists but is not running. + */ + HW_TS_Stop(LpTimerContext.LpTimerFreeRTOS_Id); + + return (uint32_t)val_ticks; +} +#endif +/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ |