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Rev	Author	Line No.	Line
2	mjames	1	/**
		2	******************************************************************************
		3	* @file stm32f0xx_hal_timebase_tim_template.c
		4	* @brief HAL time base based on the hardware TIM Template.
		5	*
		6	* This file override the native HAL time base functions (defined as weak)
		7	* the TIM time base:
		8	* + Intializes the TIM peripheral generate a Period elapsed Event each 1ms
		9	* + HAL_IncTick is called inside HAL_TIM_PeriodElapsedCallback ie each 1ms
		10	*
		11	******************************************************************************
		12	* @attention
		13	*
		14	* <h2><center>© Copyright (c) 2016 STMicroelectronics.
		15	* All rights reserved.</center></h2>
		16	*
		17	* This software component is licensed by ST under BSD 3-Clause license,
		18	* the "License"; You may not use this file except in compliance with the
		19	* License. You may obtain a copy of the License at:
		20	* opensource.org/licenses/BSD-3-Clause
		21	*
		22	******************************************************************************
		23	*/
		24
		25	/* Includes ------------------------------------------------------------------*/
		26	#include "stm32f0xx_hal.h"
		27
		28	/** @addtogroup STM32F0xx_HAL_Driver
		29	* @{
		30	*/
		31
		32	/** @addtogroup HAL_TimeBase_TIM
		33	* @{
		34	*/
		35
		36	/* Private typedef -----------------------------------------------------------*/
		37	/* Private define ------------------------------------------------------------*/
		38	/* Private macro -------------------------------------------------------------*/
		39	/* Private variables ---------------------------------------------------------*/
		40	TIM_HandleTypeDef TimHandle;
		41	/* Private function prototypes -----------------------------------------------*/
		42	void TIM6_DAC_IRQHandler(void);
		43	/* Private functions ---------------------------------------------------------*/
		44
		45	/**
		46	* @brief This function configures the TIM6 as a time base source.
		47	* The time source is configured to have 1ms time base with a dedicated
		48	* Tick interrupt priority.
		49	* @note This function is called automatically at the beginning of program after
		50	* reset by HAL_Init() or at any time when clock is configured, by HAL_RCC_ClockConfig().
		51	* @param TickPriority Tick interrupt priority.
		52	* @retval HAL status
		53	*/
		54	HAL_StatusTypeDef HAL_InitTick (uint32_t TickPriority)
		55	{
		56	RCC_ClkInitTypeDef clkconfig;
		57	uint32_t uwTimclock, uwAPB1Prescaler = 0U;
		58	uint32_t uwPrescalerValue = 0U;
		59	uint32_t pFLatency;
6	mjames	60	HAL_StatusTypeDef status;
		61
2	mjames	62	/* Enable TIM6 clock */
		63	__HAL_RCC_TIM6_CLK_ENABLE();
6	mjames	64
2	mjames	65	/* Get clock configuration */
		66	HAL_RCC_GetClockConfig(&clkconfig, &pFLatency);
6	mjames	67
2	mjames	68	/* Get APB1 prescaler */
		69	uwAPB1Prescaler = clkconfig.APB1CLKDivider;
6	mjames	70
2	mjames	71	/* Compute TIM6 clock */
6	mjames	72	if (uwAPB1Prescaler == RCC_HCLK_DIV1)
2	mjames	73	{
		74	uwTimclock = HAL_RCC_GetPCLK1Freq();
		75	}
		76	else
		77	{
6	mjames	78	uwTimclock = 2 * HAL_RCC_GetPCLK1Freq();
2	mjames	79	}
6	mjames	80
2	mjames	81	/* Compute the prescaler value to have TIM6 counter clock equal to 1MHz */
		82	uwPrescalerValue = (uint32_t) ((uwTimclock / 1000000U) - 1U);
6	mjames	83
2	mjames	84	/* Initialize TIM6 */
		85	TimHandle.Instance = TIM6;
6	mjames	86
2	mjames	87	/* Initialize TIMx peripheral as follow:
		88	+ Period = [(TIM6CLK/1000) - 1]. to have a (1/1000) s time base.
		89	+ Prescaler = (uwTimclock/1000000 - 1) to have a 1MHz counter clock.
		90	+ ClockDivision = 0
		91	+ Counter direction = Up
		92	*/
		93	TimHandle.Init.Period = (1000000U / 1000U) - 1U;
		94	TimHandle.Init.Prescaler = uwPrescalerValue;
		95	TimHandle.Init.ClockDivision = 0U;
		96	TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
		97	TimHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
6	mjames	98	status = HAL_TIM_Base_Init(&TimHandle);
		99	if (status == HAL_OK)
2	mjames	100	{
		101	/* Start the TIM time Base generation in interrupt mode */
6	mjames	102	status = HAL_TIM_Base_Start_IT(&TimHandle);
		103	if (status == HAL_OK)
		104	{
		105	/* Enable the TIM6 global Interrupt */
		106	HAL_NVIC_EnableIRQ(TIM6_DAC_IRQn);
		107
		108	if (TickPriority < (1UL << __NVIC_PRIO_BITS))
		109	{
		110	/* Enable the TIM6 global Interrupt */
		111	HAL_NVIC_SetPriority(TIM6_DAC_IRQn, TickPriority, 0);
		112	uwTickPrio = TickPriority;
		113	}
		114	else
		115	{
		116	status = HAL_ERROR;
		117	}
		118	}
2	mjames	119	}
		120	/* Return function status */
6	mjames	121	return status;
2	mjames	122	}
		123
		124	/**
		125	* @brief Suspend Tick increment.
		126	* @note Disable the tick increment by disabling TIM6 update interrupt.
		127	* @param None
		128	* @retval None
		129	*/
		130	void HAL_SuspendTick(void)
		131	{
		132	/* Disable TIM6 update Interrupt */
		133	__HAL_TIM_DISABLE_IT(&TimHandle, TIM_IT_UPDATE);
		134	}
		135
		136	/**
		137	* @brief Resume Tick increment.
		138	* @note Enable the tick increment by Enabling TIM6 update interrupt.
		139	* @param None
		140	* @retval None
		141	*/
		142	void HAL_ResumeTick(void)
		143	{
		144	/* Enable TIM6 Update interrupt */
		145	__HAL_TIM_ENABLE_IT(&TimHandle, TIM_IT_UPDATE);
		146	}
		147
		148	/**
		149	* @brief Period elapsed callback in non blocking mode
		150	* @note This function is called when TIM6 interrupt took place, inside
		151	* HAL_TIM_IRQHandler(). It makes a direct call to HAL_IncTick() to increment
		152	* a global variable "uwTick" used as application time base.
		153	* @param htim TIM handle
		154	* @retval None
		155	*/
		156	void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
		157	{
		158	HAL_IncTick();
		159	}
		160
		161	/**
		162	* @brief This function handles TIM interrupt request.
		163	* @param None
		164	* @retval None
		165	*/
		166	void TIM6_DAC_IRQHandler(void)
		167	{
		168	HAL_TIM_IRQHandler(&TimHandle);
		169	}
		170
		171	/**
		172	* @}
		173	*/
		174
		175	/**
		176	* @}
		177	*/
		178
		179	/********************** (C) COPYRIGHT STMicroelectronics *END OF FILE**/

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(root)/trunk/Drivers/STM32F0xx_HAL_Driver/Src/stm32f0xx_hal_timebase_tim_template.c – Rev 6