Diff: targets/cmsis/TARGET_STM/TARGET_STM32F0/TARGET_NUCLEO_F030R8/hal_tick.c

Revision:

583:967d0d8b7aed

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/cmsis/TARGET_STM/TARGET_STM32F0/TARGET_NUCLEO_F030R8/hal_tick.c	Mon Jul 06 09:15:09 2015 +0100
@@ -0,0 +1,159 @@
+/**
+  ******************************************************************************
+  * @file    hal_tick.c
+  * @author  MCD Application Team
+  * @brief   Initialization of HAL tick
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+#include "hal_tick.h"
+
+TIM_HandleTypeDef TimMasterHandle;
+uint32_t PreviousVal = 0;
+
+void us_ticker_irq_handler(void);
+void set_compare(uint16_t count);
+
+extern volatile uint32_t SlaveCounter;
+extern volatile uint32_t oc_int_part;
+extern volatile uint16_t oc_rem_part;
+
+// Used to increment the slave counter
+void timer_update_irq_handler(void)
+{
+    TimMasterHandle.Instance = TIM_MST;
+
+    // Clear Update interrupt flag
+    if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE) == SET) {
+        __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE);
+        SlaveCounter++;
+    }
+}
+
+// Used for mbed timeout (channel 1) and HAL tick (channel 2)
+void timer_oc_irq_handler(void)
+{
+    uint16_t cval = TIM_MST->CNT;
+    TimMasterHandle.Instance = TIM_MST;
+
+    // Channel 1 for mbed timeout
+    if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1) == SET) {
+        __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
+        if (oc_rem_part > 0) {
+            set_compare(oc_rem_part); // Finish the remaining time left
+            oc_rem_part = 0;
+        } else {
+            if (oc_int_part > 0) {
+                set_compare(0xFFFF);
+                oc_rem_part = cval; // To finish the counter loop the next time
+                oc_int_part--;
+            } else {
+                us_ticker_irq_handler();
+            }
+        }
+    }
+
+    // Channel 2 for HAL tick
+    if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC2) == SET) {
+        __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC2);
+        uint32_t val = __HAL_TIM_GetCounter(&TimMasterHandle);
+        if ((val - PreviousVal) >= HAL_TICK_DELAY) {
+            // Increment HAL variable
+            HAL_IncTick();
+            // Prepare next interrupt
+            __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, val + HAL_TICK_DELAY);
+            PreviousVal = val;
+        }
+    }
+}
+
+// Reconfigure the HAL tick using a standard timer instead of systick.
+HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority) {
+  
+    static uint32_t ticker_inited=0;  
+    if(ticker_inited)return HAL_OK;
+    ticker_inited=1;
+  
+    // Enable timer clock
+    TIM_MST_RCC;
+
+    // Reset timer
+    TIM_MST_RESET_ON;
+    TIM_MST_RESET_OFF;
+
+    // Update the SystemCoreClock variable
+    SystemCoreClockUpdate();
+
+    // Configure time base
+    TimMasterHandle.Instance = TIM_MST;
+    TimMasterHandle.Init.Period        = 0xFFFF;
+    TimMasterHandle.Init.Prescaler     = (uint32_t)(SystemCoreClock / 1000000) - 1; // 1 us tick
+    TimMasterHandle.Init.ClockDivision = 0;
+    TimMasterHandle.Init.CounterMode   = TIM_COUNTERMODE_UP;
+    HAL_TIM_Base_Init(&TimMasterHandle);
+
+    // Configure output compare channel 1 for mbed timeout (enabled later when used)
+    HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
+
+    // Configure output compare channel 2 for HAL tick
+    HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_2);
+    PreviousVal = __HAL_TIM_GetCounter(&TimMasterHandle);
+    __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, PreviousVal + HAL_TICK_DELAY);
+
+    // Configure interrupts
+    // Update interrupt used for 32-bit counter
+    // Output compare channel 1 interrupt for mbed timeout
+    // Output compare channel 2 interrupt for HAL tick
+    NVIC_SetVector(TIM_MST_UP_IRQ, (uint32_t)timer_update_irq_handler);
+    NVIC_EnableIRQ(TIM_MST_UP_IRQ);
+    NVIC_SetVector(TIM_MST_OC_IRQ, (uint32_t)timer_oc_irq_handler);
+    NVIC_EnableIRQ(TIM_MST_OC_IRQ);
+
+    // Enable interrupts
+    __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_UPDATE); // For 32-bit counter
+    __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2); // For HAL tick
+
+    // Enable timer
+    HAL_TIM_Base_Start(&TimMasterHandle);
+
+    return HAL_OK;
+}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+  
+/**
+  * @}
+  */    
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/