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1 /**
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2 ******************************************************************************
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3 * @file stm32l4xx_hal_timebase_TIM.c
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4 * @brief HAL time base based on the hardware TIM.
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5 ******************************************************************************
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6 *
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7 * COPYRIGHT(c) 2017 STMicroelectronics
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8 *
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9 * Redistribution and use in source and binary forms, with or without modification,
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10 * are permitted provided that the following conditions are met:
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11 * 1. Redistributions of source code must retain the above copyright notice,
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12 * this list of conditions and the following disclaimer.
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13 * 2. Redistributions in binary form must reproduce the above copyright notice,
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14 * this list of conditions and the following disclaimer in the documentation
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15 * and/or other materials provided with the distribution.
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16 * 3. Neither the name of STMicroelectronics nor the names of its contributors
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17 * may be used to endorse or promote products derived from this software
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18 * without specific prior written permission.
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19 *
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20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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23 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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26 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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27 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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28 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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30 *
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31 ******************************************************************************
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32 */
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33
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34 /* Includes ------------------------------------------------------------------*/
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35 #include "stm32l4xx_hal.h"
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36 #include "stm32l4xx_hal_tim.h"
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37 /** @addtogroup STM32F7xx_HAL_Examples
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38 * @{
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39 */
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40
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41 /** @addtogroup HAL_TimeBase
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42 * @{
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43 */
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44
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45 /* Private typedef -----------------------------------------------------------*/
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46 /* Private define ------------------------------------------------------------*/
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47 /* Private macro -------------------------------------------------------------*/
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48 /* Private variables ---------------------------------------------------------*/
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49 TIM_HandleTypeDef htim6;
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50 uint32_t uwIncrementState = 0;
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51 /* Private function prototypes -----------------------------------------------*/
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52 /* Private functions ---------------------------------------------------------*/
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53
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54 /**
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55 * @brief This function configures the TIM6 as a time base source.
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56 * The time source is configured to have 1ms time base with a dedicated
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57 * Tick interrupt priority.
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58 * @note This function is called automatically at the beginning of program after
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59 * reset by HAL_Init() or at any time when clock is configured, by HAL_RCC_ClockConfig().
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60 * @param TickPriority: Tick interrupt priorty.
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61 * @retval HAL status
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62 */
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63 HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
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64 {
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65 RCC_ClkInitTypeDef clkconfig;
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66 uint32_t uwTimclock = 0;
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67 uint32_t uwPrescalerValue = 0;
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68 uint32_t pFLatency;
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69
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70 /*Configure the TIM6 IRQ priority */
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71 HAL_NVIC_SetPriority(TIM6_DAC_IRQn, TickPriority ,0);
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72
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73 /* Enable the TIM6 global Interrupt */
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74 HAL_NVIC_EnableIRQ(TIM6_DAC_IRQn);
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75
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76 /* Enable TIM6 clock */
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77 __HAL_RCC_TIM6_CLK_ENABLE();
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78
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79 /* Get clock configuration */
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80 HAL_RCC_GetClockConfig(&clkconfig, &pFLatency);
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81
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82 /* Compute TIM6 clock */
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4
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83 uwTimclock = 2*HAL_RCC_GetPCLK1Freq();
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0
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84
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85 /* Compute the prescaler value to have TIM6 counter clock equal to 1MHz */
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86 uwPrescalerValue = (uint32_t) ((uwTimclock / 1000000) - 1);
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87
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88 /* Initialize TIM6 */
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89 htim6.Instance = TIM6;
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90
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91 /* Initialize TIMx peripheral as follow:
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92 + Period = [(TIM6CLK/1000) - 1]. to have a (1/1000) s time base.
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93 + Prescaler = (uwTimclock/1000000 - 1) to have a 1MHz counter clock.
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94 + ClockDivision = 0
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95 + Counter direction = Up
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96 */
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97 htim6.Init.Period = (1000000 / 1000) - 1;
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98 htim6.Init.Prescaler = uwPrescalerValue;
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99 htim6.Init.ClockDivision = 0;
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100 htim6.Init.CounterMode = TIM_COUNTERMODE_UP;
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101 if(HAL_TIM_Base_Init(&htim6) == HAL_OK)
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102 {
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103 /* Start the TIM time Base generation in interrupt mode */
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104 return HAL_TIM_Base_Start_IT(&htim6);
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105 }
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106
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107 /* Return function status */
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108 return HAL_ERROR;
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109 }
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110
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111 /**
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112 * @brief Suspend Tick increment.
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113 * @note Disable the tick increment by disabling TIM6 update interrupt.
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114 * @param None
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115 * @retval None
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116 */
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117 void HAL_SuspendTick(void)
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118 {
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119 /* Disable TIM6 update Interrupt */
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120 __HAL_TIM_DISABLE_IT(&htim6, TIM_IT_UPDATE);
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121 }
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122
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123 /**
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124 * @brief Resume Tick increment.
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125 * @note Enable the tick increment by Enabling TIM6 update interrupt.
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126 * @param None
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127 * @retval None
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128 */
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129 void HAL_ResumeTick(void)
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130 {
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131 /* Enable TIM6 Update interrupt */
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132 __HAL_TIM_ENABLE_IT(&htim6, TIM_IT_UPDATE);
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133 }
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134
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135 /**
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136 * @}
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137 */
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138
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139 /**
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140 * @}
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141 */
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142
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143 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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