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| Rev | Author | Line No. | Line |
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| 77 | mjames | 1 | /** |
| 2 | ****************************************************************************** |
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| 3 | * @file stm32l1xx_hal_timebase_tim_template.c |
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| 4 | * @author MCD Application Team |
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| 5 | * @brief HAL time base based on the hardware TIM Template. |
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| 6 | * |
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| 7 | * This file override the native HAL time base functions (defined as weak) |
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| 8 | * the TIM time base: |
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| 9 | * + Initializes the TIM peripheral to generate a Period elapsed Event each 1ms |
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| 10 | * + HAL_IncTick is called inside HAL_TIM_PeriodElapsedCallback ie each 1ms |
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| 11 | * |
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| 12 | ****************************************************************************** |
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| 13 | * @attention |
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| 14 | * |
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| 15 | * Copyright (c) 2017 STMicroelectronics. |
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| 16 | * All rights reserved. |
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| 17 | * |
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| 18 | * This software is licensed under terms that can be found in the LICENSE file |
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| 19 | * in the root directory of this software component. |
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| 20 | * If no LICENSE file comes with this software, it is provided AS-IS. |
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| 21 | * |
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| 22 | ****************************************************************************** |
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| 23 | @verbatim |
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| 24 | ============================================================================== |
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| 25 | ##### How to use this driver ##### |
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| 26 | ============================================================================== |
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| 27 | [..] |
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| 28 | This file must be copied to the application folder and modified as follows: |
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| 29 | (#) Rename it to 'stm32l1xx_hal_timebase_tim.c' |
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| 30 | (#) Add this file and the TIM HAL driver files to your project and make sure |
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| 31 | HAL_TIM_MODULE_ENABLED is defined in stm32l1xx_hal_conf.h |
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| 32 | |||
| 33 | [..] |
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| 34 | (@) The application needs to ensure that the time base is always set to 1 millisecond |
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| 35 | to have correct HAL operation. |
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| 36 | |||
| 37 | @endverbatim |
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| 38 | ****************************************************************************** |
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| 39 | */ |
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| 40 | |||
| 41 | /* Includes ------------------------------------------------------------------*/ |
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| 42 | #include "stm32l1xx_hal.h" |
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| 43 | |||
| 44 | /** @addtogroup STM32L1xx_HAL_Driver |
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| 45 | * @{ |
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| 46 | */ |
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| 47 | |||
| 48 | /** @addtogroup HAL_TimeBase_TIM |
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| 49 | * @{ |
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| 50 | */ |
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| 51 | |||
| 52 | /* Private typedef -----------------------------------------------------------*/ |
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| 53 | /* Private define ------------------------------------------------------------*/ |
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| 54 | /* Private macro -------------------------------------------------------------*/ |
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| 55 | /* Private variables ---------------------------------------------------------*/ |
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| 56 | TIM_HandleTypeDef TimHandle; |
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| 57 | /* Private function prototypes -----------------------------------------------*/ |
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| 58 | void TIM6_IRQHandler(void); |
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| 59 | /* Private functions ---------------------------------------------------------*/ |
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| 60 | |||
| 61 | /** |
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| 62 | * @brief This function configures the TIM6 as a time base source. |
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| 63 | * The time source is configured to have 1ms time base with a dedicated |
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| 64 | * Tick interrupt priority. |
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| 65 | * @note This function is called automatically at the beginning of program after |
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| 66 | * reset by HAL_Init() or at any time when clock is configured, by HAL_RCC_ClockConfig(). |
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| 67 | * @param TickPriority Tick interrupt priority. |
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| 68 | * @retval HAL status |
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| 69 | */ |
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| 70 | HAL_StatusTypeDef HAL_InitTick (uint32_t TickPriority) |
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| 71 | { |
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| 72 | RCC_ClkInitTypeDef clkconfig; |
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| 73 | uint32_t uwTimclock, uwAPB1Prescaler = 0U; |
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| 74 | uint32_t uwPrescalerValue = 0U; |
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| 75 | uint32_t pFLatency; |
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| 76 | HAL_StatusTypeDef status = HAL_OK; |
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| 77 | |||
| 78 | /* Enable TIM6 clock */ |
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| 79 | __HAL_RCC_TIM6_CLK_ENABLE(); |
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| 80 | |||
| 81 | /* Get clock configuration */ |
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| 82 | HAL_RCC_GetClockConfig(&clkconfig, &pFLatency); |
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| 83 | |||
| 84 | /* Get APB1 prescaler */ |
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| 85 | uwAPB1Prescaler = clkconfig.APB1CLKDivider; |
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| 86 | |||
| 87 | /* Compute TIM6 clock */ |
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| 88 | if (uwAPB1Prescaler == RCC_HCLK_DIV1) |
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| 89 | { |
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| 90 | uwTimclock = HAL_RCC_GetPCLK1Freq(); |
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| 91 | } |
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| 92 | else |
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| 93 | { |
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| 94 | uwTimclock = 2U * HAL_RCC_GetPCLK1Freq(); |
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| 95 | } |
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| 96 | |||
| 97 | /* Compute the prescaler value to have TIM6 counter clock equal to 1MHz */ |
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| 98 | uwPrescalerValue = (uint32_t) ((uwTimclock / 1000000U) - 1U); |
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| 99 | |||
| 100 | /* Initialize TIM6 */ |
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| 101 | TimHandle.Instance = TIM6; |
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| 102 | |||
| 103 | /* Initialize TIMx peripheral as follow: |
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| 104 | + Period = [(TIM6CLK/1000) - 1]. to have a (1/1000) s time base. |
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| 105 | + Prescaler = (uwTimclock/1000000 - 1) to have a 1MHz counter clock. |
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| 106 | + ClockDivision = 0 |
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| 107 | + Counter direction = Up |
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| 108 | */ |
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| 109 | TimHandle.Init.Period = (1000000U / 1000U) - 1U; |
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| 110 | TimHandle.Init.Prescaler = uwPrescalerValue; |
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| 111 | TimHandle.Init.ClockDivision = 0U; |
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| 112 | TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP; |
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| 113 | status = HAL_TIM_Base_Init(&TimHandle); |
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| 114 | if (status == HAL_OK) |
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| 115 | { |
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| 116 | /* Start the TIM time Base generation in interrupt mode */ |
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| 117 | status = HAL_TIM_Base_Start_IT(&TimHandle); |
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| 118 | if (status == HAL_OK) |
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| 119 | { |
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| 120 | /* Enable the TIM6 global Interrupt */ |
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| 121 | HAL_NVIC_EnableIRQ(TIM6_IRQn); |
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| 122 | |||
| 123 | if (TickPriority < (1UL << __NVIC_PRIO_BITS)) |
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| 124 | { |
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| 125 | /*Configure the TIM6 IRQ priority */ |
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| 126 | HAL_NVIC_SetPriority(TIM6_IRQn, TickPriority ,0); |
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| 127 | uwTickPrio = TickPriority; |
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| 128 | } |
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| 129 | else |
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| 130 | { |
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| 131 | status = HAL_ERROR; |
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| 132 | } |
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| 133 | } |
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| 134 | } |
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| 135 | |||
| 136 | /* Return function status */ |
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| 137 | return status; |
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| 138 | } |
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| 139 | |||
| 140 | /** |
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| 141 | * @brief Suspend Tick increment. |
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| 142 | * @note Disable the tick increment by disabling TIM6 update interrupt. |
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| 143 | * @param None |
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| 144 | * @retval None |
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| 145 | */ |
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| 146 | void HAL_SuspendTick(void) |
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| 147 | { |
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| 148 | /* Disable TIM6 update interrupt */ |
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| 149 | __HAL_TIM_DISABLE_IT(&TimHandle, TIM_IT_UPDATE); |
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| 150 | } |
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| 151 | |||
| 152 | /** |
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| 153 | * @brief Resume Tick increment. |
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| 154 | * @note Enable the tick increment by enabling TIM6 update interrupt. |
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| 155 | * @param None |
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| 156 | * @retval None |
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| 157 | */ |
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| 158 | void HAL_ResumeTick(void) |
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| 159 | { |
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| 160 | /* Enable TIM6 update interrupt */ |
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| 161 | __HAL_TIM_ENABLE_IT(&TimHandle, TIM_IT_UPDATE); |
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| 162 | } |
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| 163 | |||
| 164 | /** |
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| 165 | * @brief Period elapsed callback in non blocking mode |
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| 166 | * @note This function is called when TIM6 interrupt took place, inside |
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| 167 | * HAL_TIM_IRQHandler(). It makes a direct call to HAL_IncTick() to increment |
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| 168 | * a global variable "uwTick" used as application time base. |
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| 169 | * @param htim TIM handle |
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| 170 | * @retval None |
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| 171 | */ |
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| 172 | void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) |
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| 173 | { |
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| 174 | HAL_IncTick(); |
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| 175 | } |
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| 176 | |||
| 177 | /** |
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| 178 | * @brief This function handles TIM interrupt request. |
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| 179 | * @param None |
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| 180 | * @retval None |
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| 181 | */ |
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| 182 | void TIM6_IRQHandler(void) |
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| 183 | { |
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| 184 | HAL_TIM_IRQHandler(&TimHandle); |
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| 185 | } |
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| 186 | |||
| 187 | /** |
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| 188 | * @} |
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| 189 | */ |
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| 190 | |||
| 191 | /** |
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| 192 | * @} |
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| 193 | */ |
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| 194 | |||
| 195 |