Diff: targets/cmsis/TARGET_STM/TARGET_STM32F7/TARGET_DISCO_F746NG/hal_tick.c

Revision:

573:ad23fe03a082

Child:

610:813dcc80987e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/cmsis/TARGET_STM/TARGET_STM32F7/TARGET_DISCO_F746NG/hal_tick.c	Fri Jun 19 09:15:11 2015 +0100
@@ -0,0 +1,134 @@
+/**
+  ******************************************************************************
+  * @file    hal_tick.c
+  * @author  MCD Application Team
+  * @brief   Initialization of HAL tick
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT 2015 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"
+
+// Enable it to measure the tick period on  ARDUINO-D2 pin (PG6)
+#define DEBUG_TICK 0
+
+TIM_HandleTypeDef TimMasterHandle;
+uint32_t PreviousVal = 0;
+
+void HAL_IncTick(void);
+void us_ticker_irq_handler(void);
+
+void timer_irq_handler(void) {
+    // Channel 1 for mbed timeout
+    if (__HAL_TIM_GET_ITSTATUS(&TimMasterHandle, TIM_IT_CC1) == SET) {
+        __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC1);
+        us_ticker_irq_handler();
+    }
+
+    // Channel 2 for HAL tick
+    if (__HAL_TIM_GET_ITSTATUS(&TimMasterHandle, TIM_IT_CC2) == SET) {
+        __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_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;
+#if DEBUG_TICK == 1
+            HAL_GPIO_TogglePin(GPIOG, GPIO_PIN_6);
+#endif
+        }
+    }
+}
+
+// Reconfigure the HAL tick using a standard timer instead of systick.
+HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority) {
+    // Enable timer clock
+    TIM_MST_RCC;
+
+    // Reset timer
+    TIM_MST_RESET_ON;
+    TIM_MST_RESET_OFF;
+
+    // Just in case the system clock has been changed and the SystemCoreClock
+    // variable not updated...
+    SystemCoreClockUpdate();
+
+    // Note on timer clock:
+    // TIM5 input clock (TIM5CLK) is set to APB1 clock (PCLK1) x2,
+    // since APB1 prescaler is equal to 4 (see system_stm32f7xx.c).
+    // We have TIM5CLK = PCLK1*2 and PCLK1 = HCLK/4
+    // So TIM5CLK = HCLK/2 = SystemCoreClock/2
+
+    // Configure time base
+    TimMasterHandle.Instance = TIM_MST;
+    TimMasterHandle.Init.Period            = 0xFFFFFFFF;
+    TimMasterHandle.Init.Prescaler         = (uint32_t)((SystemCoreClock / 2) / 1000000) - 1; // 1 us tick
+    TimMasterHandle.Init.ClockDivision     = 0;
+    TimMasterHandle.Init.CounterMode       = TIM_COUNTERMODE_UP;
+    TimMasterHandle.Init.RepetitionCounter = 0;
+    HAL_TIM_OC_Init(&TimMasterHandle);
+
+    NVIC_SetVector(TIM_MST_IRQ, (uint32_t)timer_irq_handler);
+    NVIC_EnableIRQ(TIM_MST_IRQ);
+
+    // Channel 1 for mbed timeout
+    HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
+
+    // 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);
+    __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2);
+
+#if DEBUG_TICK == 1
+    __GPIOG_CLK_ENABLE();
+    GPIO_InitTypeDef GPIO_InitStruct;
+    GPIO_InitStruct.Pin = GPIO_PIN_6;
+    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
+    GPIO_InitStruct.Pull = GPIO_PULLUP;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
+    HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);
+#endif
+
+    return HAL_OK;
+}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+  
+/**
+  * @}
+  */    
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/