tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32F3/TARGET_DISCO_F334C8/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         __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC1);
  46         us_ticker_irq_handler();
  47     }
  48
  49     // Channel 2 for HAL tick
  50     if (__HAL_TIM_GET_ITSTATUS(&TimMasterHandle, TIM_IT_CC2) == SET) {
  51         __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC2);
  52         uint32_t val = __HAL_TIM_GetCounter(&TimMasterHandle);
  53         if ((val - PreviousVal) >= HAL_TICK_DELAY) {
  54             // Increment HAL variable
  55             HAL_IncTick();
  56             // Prepare next interrupt
  57             __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, val + HAL_TICK_DELAY);
  58             PreviousVal = val;
  59 #if 0 // For DEBUG only
  60             HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_6);
  61 #endif
  62         }
  63     }
  64 }
  65
  66 // Reconfigure the HAL tick using a standard timer instead of systick.
  67 HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority) {
  68     // Enable timer clock
  69     TIM_MST_RCC;
  70
  71     // Reset timer
  72     TIM_MST_RESET_ON;
  73     TIM_MST_RESET_OFF;
  74
  75     // Configure time base
  76     TimMasterHandle.Instance = TIM_MST;
  77     TimMasterHandle.Init.Period            = 0xFFFFFFFF;
  78     TimMasterHandle.Init.Prescaler         = (uint32_t)(SystemCoreClock / 1000000) - 1; // 1 us tick
  79     TimMasterHandle.Init.ClockDivision     = 0;
  80     TimMasterHandle.Init.CounterMode       = TIM_COUNTERMODE_UP;
  81     TimMasterHandle.Init.RepetitionCounter = 0;
  82     HAL_TIM_OC_Init(&TimMasterHandle);
  83
  84     NVIC_SetVector(TIM_MST_IRQ, (uint32_t)timer_irq_handler);
  85     NVIC_EnableIRQ(TIM_MST_IRQ);
  86
  87     // Channel 1 for mbed timeout
  88     HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
  89
  90     // Channel 2 for HAL tick
  91     HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_2);
  92     PreviousVal = __HAL_TIM_GetCounter(&TimMasterHandle);
  93     __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, PreviousVal + HAL_TICK_DELAY);
  94     __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2);
  95
  96 #if 0 // For DEBUG only
  97     __GPIOB_CLK_ENABLE();
  98     GPIO_InitTypeDef GPIO_InitStruct;
  99     GPIO_InitStruct.Pin = GPIO_PIN_6;
 100     GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 101     GPIO_InitStruct.Pull = GPIO_PULLUP;
 102     GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
 103     HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 104 #endif
 105
 106     return HAL_OK;
 107 }
 108
 109 /**
 110   * @}
 111   */
 112
 113 /**
 114   * @}
 115   */
 116
 117 /**
 118   * @}
 119   */
 120 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/