tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32F0/TARGET_NUCLEO_F070RB/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 void set_compare(uint16_t count);
  42
  43 extern volatile uint32_t SlaveCounter;
  44 extern volatile uint32_t oc_int_part;
  45 extern volatile uint16_t oc_rem_part;
  46
  47 // Used to increment the slave counter
  48 void timer_update_irq_handler(void)
  49 {
  50     TimMasterHandle.Instance = TIM_MST;
  51
  52     // Clear Update interrupt flag
  53     if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE) == SET) {
  54         __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE);
  55         SlaveCounter++;
  56     }
  57 }
  58
  59 // Used for mbed timeout (channel 1) and HAL tick (channel 2)
  60 void timer_oc_irq_handler(void)
  61 {
  62     uint16_t cval = TIM_MST->CNT;
  63     TimMasterHandle.Instance = TIM_MST;
  64
  65     // Channel 1 for mbed timeout
  66     if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1) == SET) {
  67         __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
  68         if (oc_rem_part > 0) {
  69             set_compare(oc_rem_part); // Finish the remaining time left
  70             oc_rem_part = 0;
  71         } else {
  72             if (oc_int_part > 0) {
  73                 set_compare(0xFFFF);
  74                 oc_rem_part = cval; // To finish the counter loop the next time
  75                 oc_int_part--;
  76             } else {
  77                 us_ticker_irq_handler();
  78             }
  79         }
  80     }
  81
  82     // Channel 2 for HAL tick
  83     if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC2) == SET) {
  84         __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC2);
  85         uint32_t val = __HAL_TIM_GetCounter(&TimMasterHandle);
  86         if ((val - PreviousVal) >= HAL_TICK_DELAY) {
  87             // Increment HAL variable
  88             HAL_IncTick();
  89             // Prepare next interrupt
  90             __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, val + HAL_TICK_DELAY);
  91             PreviousVal = val;
  92 #if 1 // For DEBUG only
  93             HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_6);
  94 #endif
  95         }
  96     }
  97 }
  98
  99 // Reconfigure the HAL tick using a standard timer instead of systick.
 100 HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority) {
 101     // Enable timer clock
 102     TIM_MST_RCC;
 103
 104     // Reset timer
 105     TIM_MST_RESET_ON;
 106     TIM_MST_RESET_OFF;
 107
 108     // Update the SystemCoreClock variable
 109     SystemCoreClockUpdate();
 110
 111     // Configure time base
 112     TimMasterHandle.Instance = TIM_MST;
 113     TimMasterHandle.Init.Period        = 0xFFFF;
 114     TimMasterHandle.Init.Prescaler     = (uint32_t)(SystemCoreClock / 1000000) - 1; // 1 us tick
 115     TimMasterHandle.Init.ClockDivision = 0;
 116     TimMasterHandle.Init.CounterMode   = TIM_COUNTERMODE_UP;
 117     HAL_TIM_Base_Init(&TimMasterHandle);
 118
 119     // Configure output compare channel 1 for mbed timeout (enabled later when used)
 120     HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
 121
 122     // Configure output compare channel 2 for HAL tick
 123     HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_2);
 124     PreviousVal = __HAL_TIM_GetCounter(&TimMasterHandle);
 125     __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, PreviousVal + HAL_TICK_DELAY);
 126
 127     // Configure interrupts
 128     // Update interrupt used for 32-bit counter
 129     // Output compare channel 1 interrupt for mbed timeout
 130     // Output compare channel 2 interrupt for HAL tick
 131     NVIC_SetVector(TIM_MST_UP_IRQ, (uint32_t)timer_update_irq_handler);
 132     NVIC_EnableIRQ(TIM_MST_UP_IRQ);
 133     NVIC_SetVector(TIM_MST_OC_IRQ, (uint32_t)timer_oc_irq_handler);
 134     NVIC_EnableIRQ(TIM_MST_OC_IRQ);
 135
 136     // Enable interrupts
 137     __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_UPDATE); // For 32-bit counter
 138     __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2); // For HAL tick
 139
 140     // Enable timer
 141     HAL_TIM_Base_Start(&TimMasterHandle);
 142
 143 #if 1 // For DEBUG only
 144     __GPIOB_CLK_ENABLE();
 145     GPIO_InitTypeDef GPIO_InitStruct;
 146     GPIO_InitStruct.Pin = GPIO_PIN_6;
 147     GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 148     GPIO_InitStruct.Pull = GPIO_PULLUP;
 149     GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
 150     HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 151 #endif
 152
 153     return HAL_OK;
 154 }
 155
 156 /**
 157   * @}
 158   */
 159
 160 /**
 161   * @}
 162   */
 163
 164 /**
 165   * @}
 166   */
 167 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/