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jeremybenn |
/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
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* File Name : stm32f10x_systick.c
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* Author : MCD Application Team
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* Date First Issued : 09/29/2006
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* Description : This file provides all the SysTick firmware functions.
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********************************************************************************
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* History:
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* 04/02/2007: V0.2
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* 02/05/2007: V0.1
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* 09/29/2006: V0.01
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********************************************************************************
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* THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
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* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
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* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
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* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
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* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
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* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
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*******************************************************************************/
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/* Includes ------------------------------------------------------------------*/
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#include "stm32f10x_systick.h"
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/* ---------------------- SysTick registers bit mask -------------------- */
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/* CTRL TICKINT Mask */
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#define CTRL_TICKINT_Set ((u32)0x00000002)
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#define CTRL_TICKINT_Reset ((u32)0xFFFFFFFD)
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/* SysTick Flag Mask */
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#define FLAG_Mask ((u8)0x1F)
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Private function prototypes -----------------------------------------------*/
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/* Private functions ---------------------------------------------------------*/
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/*******************************************************************************
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* Function Name : SysTick_CLKSourceConfig
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* Description : Configures the SysTick clock source.
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* Input : - SysTick_CLKSource: specifies the SysTick clock source.
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* This parameter can be one of the following values:
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* - SysTick_CLKSource_HCLK_Div8: AHB clock divided by 8
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* selected as SysTick clock source.
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* - SysTick_CLKSource_HCLK: AHB clock selected as
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* SysTick clock source.
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* Output : None
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* Return : None
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*******************************************************************************/
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void SysTick_CLKSourceConfig(u32 SysTick_CLKSource)
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{
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/* Check the parameters */
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assert(IS_SYSTICK_CLK_SOURCE(SysTick_CLKSource));
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if (SysTick_CLKSource == SysTick_CLKSource_HCLK)
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{
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SysTick->CTRL |= SysTick_CLKSource_HCLK;
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}
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else
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{
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SysTick->CTRL &= SysTick_CLKSource_HCLK_Div8;
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}
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}
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/*******************************************************************************
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* Function Name : SysTick_SetReload
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* Description : Sets SysTick Reload value.
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* Input : - Reload: SysTick Reload new value.
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* This parameter must be a number between 1 and 0xFFFFFF.
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* Output : None
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* Return : None
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*******************************************************************************/
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void SysTick_SetReload(u32 Reload)
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{
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/* Check the parameters */
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assert(IS_SYSTICK_RELOAD(Reload));
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SysTick->LOAD = Reload;
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}
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/*******************************************************************************
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* Function Name : SysTick_CounterCmd
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* Description : Enables or disables the SysTick counter.
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* Input : - SysTick_Counter: new state of the SysTick counter.
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* This parameter can be one of the following values:
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* - SysTick_Counter_Disable: Disable counter
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* - SysTick_Counter_Enable: Enable counter
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* - SysTick_Counter_Clear: Clear counter value to 0
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* Output : None
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* Return : None
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*******************************************************************************/
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void SysTick_CounterCmd(u32 SysTick_Counter)
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{
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/* Check the parameters */
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assert(IS_SYSTICK_COUNTER(SysTick_Counter));
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if (SysTick_Counter == SysTick_Counter_Clear)
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{
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SysTick->VAL = SysTick_Counter_Clear;
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}
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else
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{
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if (SysTick_Counter == SysTick_Counter_Enable)
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{
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SysTick->CTRL |= SysTick_Counter_Enable;
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}
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else
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{
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SysTick->CTRL &= SysTick_Counter_Disable;
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}
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}
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}
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/*******************************************************************************
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* Function Name : SysTick_ITConfig
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* Description : Enables or disables the SysTick Interrupt.
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* Input : - NewState: new state of the SysTick Interrupt.
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* This parameter can be: ENABLE or DISABLE.
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* Output : None
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* Return : None
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*******************************************************************************/
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void SysTick_ITConfig(FunctionalState NewState)
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{
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/* Check the parameters */
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assert(IS_FUNCTIONAL_STATE(NewState));
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if (NewState != DISABLE)
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{
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SysTick->CTRL |= CTRL_TICKINT_Set;
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}
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else
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{
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SysTick->CTRL &= CTRL_TICKINT_Reset;
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}
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}
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/*******************************************************************************
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* Function Name : SysTick_GetCounter
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* Description : Gets SysTick counter value.
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* Input : None
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* Output : None
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* Return : SysTick current value
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*******************************************************************************/
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u32 SysTick_GetCounter(void)
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{
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return(SysTick->VAL);
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}
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/*******************************************************************************
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* Function Name : SysTick_GetFlagStatus
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* Description : Checks whether the specified SysTick flag is set or not.
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* Input : - SysTick_FLAG: specifies the flag to check.
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* This parameter can be one of the following values:
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* - SysTick_FLAG_COUNT
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* - SysTick_FLAG_SKEW
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* - SysTick_FLAG_NOREF
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* Output : None
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* Return : None
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*******************************************************************************/
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FlagStatus SysTick_GetFlagStatus(u8 SysTick_FLAG)
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{
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u32 tmp = 0;
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u32 statusreg = 0;
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FlagStatus bitstatus = RESET;
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/* Check the parameters */
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assert(IS_SYSTICK_FLAG(SysTick_FLAG));
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/* Get the SysTick register index */
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tmp = SysTick_FLAG >> 5;
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if (tmp == 1) /* The flag to check is in CTRL register */
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{
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statusreg = SysTick->CTRL;
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}
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else /* The flag to check is in CALIB register */
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{
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statusreg = SysTick->CALIB;
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}
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/* Get the flag position */
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tmp = SysTick_FLAG & FLAG_Mask;
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if ((statusreg & ((u32)1 << tmp)) != (u32)RESET)
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{
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bitstatus = SET;
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}
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else
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{
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bitstatus = RESET;
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}
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return bitstatus;
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}
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/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/
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