tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32F4/TARGET_MTS_MDOT_F411RE/hal_tick.c

   1 /**
   2   ******************************************************************************
   3   * @file    hal_tick.c
   4   * @author  MCD Application Team
   5   * @brief   Initialization of HAL tick
   6   ******************************************************************************
   7   * @attention
   8   *
   9   * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
  10   *
  11   * Redistribution and use in source and binary forms, with or without modification,
  12   * are permitted provided that the following conditions are met:
  13   *   1. Redistributions of source code must retain the above copyright notice,
  14   *      this list of conditions and the following disclaimer.
  15   *   2. Redistributions in binary form must reproduce the above copyright notice,
  16   *      this list of conditions and the following disclaimer in the documentation
  17   *      and/or other materials provided with the distribution.
  18   *   3. Neither the name of STMicroelectronics nor the names of its contributors
  19   *      may be used to endorse or promote products derived from this software
  20   *      without specific prior written permission.
  21   *
  22   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  23   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  25   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  26   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  28   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  29   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32   *
  33   ******************************************************************************
  34   */
  35 #include "hal_tick.h"
  36
  37 TIM_HandleTypeDef TimMasterHandle;
  38 uint32_t PreviousVal = 0;
  39
  40 void us_ticker_irq_handler(void);
  41
  42 void timer_irq_handler(void) {
  43     // Channel 1 for mbed timeout
  44     if (__HAL_TIM_GET_ITSTATUS(&TimMasterHandle, TIM_IT_CC1) == SET) {
  45         us_ticker_irq_handler();
  46     }
  47
  48     // Channel 2 for HAL tick
  49     if (__HAL_TIM_GET_ITSTATUS(&TimMasterHandle, TIM_IT_CC2) == SET) {
  50         __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC2);
  51         uint32_t val = __HAL_TIM_GetCounter(&TimMasterHandle);
  52         if ((val - PreviousVal) >= HAL_TICK_DELAY) {
  53             // Increment HAL variable
  54             HAL_IncTick();
  55             // Prepare next interrupt
  56             __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, val + HAL_TICK_DELAY);
  57             PreviousVal = val;
  58 #if 0 // For DEBUG only
  59             HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_6);
  60 #endif
  61         }
  62     }
  63 }
  64
  65 // Reconfigure the HAL tick using a standard timer instead of systick.
  66 HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority) {
  67     // Enable timer clock
  68     TIM_MST_RCC;
  69
  70     // Reset timer
  71     TIM_MST_RESET_ON;
  72     TIM_MST_RESET_OFF;
  73
  74     // Update the SystemCoreClock variable
  75     SystemCoreClockUpdate();
  76
  77     // Configure time base
  78     TimMasterHandle.Instance = TIM_MST;
  79     TimMasterHandle.Init.Period            = 0xFFFFFFFF;
  80     TimMasterHandle.Init.Prescaler         = (uint32_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick
  81     TimMasterHandle.Init.ClockDivision     = 0;
  82     TimMasterHandle.Init.CounterMode       = TIM_COUNTERMODE_UP;
  83     TimMasterHandle.Init.RepetitionCounter = 0;
  84     HAL_TIM_OC_Init(&TimMasterHandle);
  85
  86     NVIC_SetVector(TIM_MST_IRQ, (uint32_t)timer_irq_handler);
  87     NVIC_EnableIRQ(TIM_MST_IRQ);
  88
  89     // Channel 1 for mbed timeout
  90     HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
  91
  92     // Channel 2 for HAL tick
  93     HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_2);
  94     PreviousVal = __HAL_TIM_GetCounter(&TimMasterHandle);
  95     __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, PreviousVal + HAL_TICK_DELAY);
  96     __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2);
  97
  98 #if 0 // For DEBUG only
  99     __GPIOB_CLK_ENABLE();
 100     GPIO_InitTypeDef GPIO_InitStruct;
 101     GPIO_InitStruct.Pin = GPIO_PIN_6;
 102     GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 103     GPIO_InitStruct.Pull = GPIO_PULLUP;
 104     GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
 105     HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 106 #endif
 107
 108     return HAL_OK;
 109 }
 110
 111 /**
 112   * @}
 113   */
 114
 115 /**
 116   * @}
 117   */
 118
 119 /**
 120   * @}
 121   */
 122 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/