1 /** 2 ****************************************************************************** 3 * @file tick.c 4 * @author MCD Application Team 5 * @brief Tick implementation without tick interrupt 6 ****************************************************************************** 7 * @attention 8 * 9 * <h2><center>© Copyright (c) 2020 STMicroelectronics. 10 * All rights reserved.</center></h2> 11 * 12 * This software component is licensed by ST under BSD 3-Clause license, 13 * the "License"; You may not use this file except in compliance with the 14 * License. You may obtain a copy of the License at: 15 * opensource.org/licenses/BSD-3-Clause 16 * 17 ****************************************************************************** 18 */ 19 #include "stm32hal.h" 20 #include "tick_device.h" 21 /** 22 * @brief This function configures the source of the time base: 23 * The time source is configured to have 1ms time base with a dedicated 24 * Tick interrupt priority. 25 * @note This function overwrites the one declared as __weak in HAL. 26 * In this implementation, nothing is done. 27 * @retval HAL status 28 */ 29 HAL_InitTick(uint32_t TickPriority)30HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority) 31 { 32 /* load 1Hz for timeout 1 second */ 33 uint32_t ticks = SystemCoreClock ; 34 SysTick->LOAD = (uint32_t)(ticks - 1UL); /* set reload register */ 35 SysTick->VAL = 0UL; /* Load the SysTick Counter Value */ 36 SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk | 37 SysTick_CTRL_ENABLE_Msk; 38 return HAL_OK; 39 } 40 41 /** 42 * @brief Provide a tick value in millisecond. 43 * @note This function overwrites the one declared as __weak in HAL. 44 * In this implementation, time is counted without using SysTick timer interrupts. 45 * @retval tick value 46 */ HAL_GetTick(void)47uint32_t HAL_GetTick(void) 48 { 49 static uint32_t m_uTick = 0U; 50 static uint32_t t1 = 0U, tdelta = 0U; 51 uint32_t t2; 52 53 /* device specific behaviour for HAL_GetTick */ 54 DEVICE_GET_TICK; 55 t2 = SysTick->VAL; 56 57 if (t2 <= t1) 58 { 59 tdelta += t1 - t2; 60 } 61 else 62 { 63 tdelta += t1 + SysTick->LOAD - t2; 64 } 65 66 if (tdelta > (SystemCoreClock / (1000U))) 67 { 68 tdelta = 0U; 69 m_uTick ++; 70 } 71 72 t1 = t2; 73 return m_uTick; 74 }
