1 /**
2 ******************************************************************************
3 * @file stm32u5xx_hal_timebase_tim_template.c
4 * @author MCD Application Team
5 * @brief HAL time base based on the hardware TIM.
6 *
7 * This file overrides the native HAL time base functions (defined as weak)
8 * the TIM time base:
9 * + Initializes the TIM peripheral to generate a Period elapsed Event each 1ms
10 * + HAL_IncTick is called inside HAL_TIM_PeriodElapsedCallback ie each 1ms
11 *
12 ******************************************************************************
13 * @attention
14 *
15 * Copyright (c) 2021 STMicroelectronics.
16 * All rights reserved.
17 *
18 * This software is licensed under terms that can be found in the LICENSE file
19 * in the root directory of this software component.
20 * If no LICENSE file comes with this software, it is provided AS-IS.
21 *
22 ******************************************************************************
23 @verbatim
24 ==============================================================================
25 ##### How to use this driver #####
26 ==============================================================================
27 [..]
28 This file must be copied to the application folder and modified as follows:
29 (#) Rename it to 'stm32u5xx_hal_timebase_tim.c'
30 (#) Add this file and the TIM HAL drivers to your project and uncomment
31 HAL_TIM_MODULE_ENABLED define in stm32u5xx_hal_conf.h
32
33 @endverbatim
34 ******************************************************************************
35 */
36
37 /* Includes ------------------------------------------------------------------*/
38 #include "stm32u5xx_hal.h"
39
40 /** @addtogroup STM32U5xx_HAL_Driver
41 * @{
42 */
43
44 /** @addtogroup HAL_TimeBase
45 * @{
46 */
47
48 /* Private typedef -----------------------------------------------------------*/
49 /* Private define ------------------------------------------------------------*/
50 /* Private macro -------------------------------------------------------------*/
51 /* Private variables ---------------------------------------------------------*/
52 static TIM_HandleTypeDef TimHandle;
53
54 /* Private function prototypes -----------------------------------------------*/
55 void TIM6_IRQHandler(void);
56 #if (USE_HAL_TIM_REGISTER_CALLBACKS == 1U)
57 void TimeBase_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim);
58 #endif /* USE_HAL_TIM_REGISTER_CALLBACKS */
59 /* Private functions ---------------------------------------------------------*/
60
61 /**
62 * @brief This function configures the TIM6 as a time base source.
63 * The time source is configured to have 1ms time base with a dedicated
64 * Tick interrupt priority.
65 * @note This function is called automatically at the beginning of program after
66 * reset by HAL_Init() or at any time when clock is configured, by HAL_RCC_ClockConfig().
67 * @param TickPriority Tick interrupt priority.
68 * @retval HAL Status
69 */
HAL_InitTick(uint32_t TickPriority)70 HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
71 {
72 RCC_ClkInitTypeDef clkconfig;
73 uint32_t uwTimclock;
74 uint32_t uwAPB1Prescaler;
75 uint32_t uwPrescalerValue;
76 uint32_t pFLatency;
77 HAL_StatusTypeDef Status;
78
79 /* Enable TIM6 clock */
80 __HAL_RCC_TIM6_CLK_ENABLE();
81
82 /* Get clock configuration */
83 HAL_RCC_GetClockConfig(&clkconfig, &pFLatency);
84
85 /* Get APB1 prescaler */
86 uwAPB1Prescaler = clkconfig.APB1CLKDivider;
87
88 /* Compute TIM6 clock */
89 if (uwAPB1Prescaler == RCC_HCLK_DIV1)
90 {
91 uwTimclock = HAL_RCC_GetPCLK1Freq();
92 }
93 else
94 {
95 uwTimclock = 2UL * HAL_RCC_GetPCLK1Freq();
96 }
97
98 /* Compute the prescaler value to have TIM6 counter clock equal to 100KHz */
99 uwPrescalerValue = (uint32_t)((uwTimclock / 100000U) - 1U);
100
101 /* Initialize TIM6 */
102 TimHandle.Instance = TIM6;
103
104 /* Initialize TIMx peripheral as follow:
105 + Period = [(TIM6CLK/1000) - 1]. to have a (1/1000) s time base.
106 + Prescaler = (uwTimclock/100000 - 1) to have a 100KHz counter clock.
107 + ClockDivision = 0
108 + Counter direction = Up
109 */
110 TimHandle.Init.Period = (100000U / 1000U) - 1U;
111 TimHandle.Init.Prescaler = uwPrescalerValue;
112 TimHandle.Init.ClockDivision = 0;
113 TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
114 Status = HAL_TIM_Base_Init(&TimHandle);
115 if (Status == HAL_OK)
116 {
117 /* Start the TIM time Base generation in interrupt mode */
118 Status = HAL_TIM_Base_Start_IT(&TimHandle);
119 if (Status == HAL_OK)
120 {
121 if (TickPriority < (1UL << __NVIC_PRIO_BITS))
122 {
123 /* Configure the TIM6 global Interrupt priority */
124 HAL_NVIC_SetPriority(TIM6_IRQn, TickPriority, 0);
125
126 /* Enable the TIM6 global Interrupt */
127 HAL_NVIC_EnableIRQ(TIM6_IRQn);
128
129 uwTickPrio = TickPriority;
130 }
131 else
132 {
133 Status = HAL_ERROR;
134 }
135 }
136 }
137 #if (USE_HAL_TIM_REGISTER_CALLBACKS == 1U)
138 HAL_TIM_RegisterCallback(&TimHandle, HAL_TIM_PERIOD_ELAPSED_CB_ID, TimeBase_TIM_PeriodElapsedCallback);
139 #endif /* USE_HAL_TIM_REGISTER_CALLBACKS */
140
141 /* Return function Status */
142 return Status;
143 }
144
145 /**
146 * @brief Suspend Tick increment.
147 * @note Disable the tick increment by disabling TIM6 update interrupt.
148 * @param None
149 * @retval None
150 */
HAL_SuspendTick(void)151 void HAL_SuspendTick(void)
152 {
153 /* Disable TIM6 update Interrupt */
154 __HAL_TIM_DISABLE_IT(&TimHandle, TIM_IT_UPDATE);
155 }
156
157 /**
158 * @brief Resume Tick increment.
159 * @note Enable the tick increment by Enabling TIM6 update interrupt.
160 * @param None
161 * @retval None
162 */
HAL_ResumeTick(void)163 void HAL_ResumeTick(void)
164 {
165 /* Enable TIM6 Update interrupt */
166 __HAL_TIM_ENABLE_IT(&TimHandle, TIM_IT_UPDATE);
167 }
168
169 /**
170 * @brief Period elapsed callback in non blocking mode
171 * @note This function is called when TIM6 interrupt took place, inside
172 * HAL_TIM_IRQHandler(). It makes a direct call to HAL_IncTick() to increment
173 * a global variable "uwTick" used as application time base.
174 * @param htim TIM handle
175 * @retval None
176 */
177 #if (USE_HAL_TIM_REGISTER_CALLBACKS == 1U)
TimeBase_TIM_PeriodElapsedCallback(TIM_HandleTypeDef * htim)178 void TimeBase_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
179 #else
180 void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
181 #endif /* USE_HAL_TIM_REGISTER_CALLBACKS */
182 {
183 /* Prevent unused argument(s) compilation warning */
184 UNUSED(htim);
185
186 HAL_IncTick();
187 }
188
189 /**
190 * @brief This function handles TIM interrupt request.
191 * @param None
192 * @retval None
193 */
TIM6_IRQHandler(void)194 void TIM6_IRQHandler(void)
195 {
196 HAL_TIM_IRQHandler(&TimHandle);
197 }
198
199 /**
200 * @}
201 */
202
203 /**
204 * @}
205 */
206
