www.pudn.com > Micrium-ST-uCOS-II-LCD-STM32-SK.rar > stm32f10x_systick.c

/******************** (C) COPYRIGHT 2007 STMicroelectronics ******************** 
* File Name          : stm32f10x_systick.c 
* Author             : MCD Application Team 
* Date First Issued  : 09/29/2006 
* Description        : This file provides all the SysTick firmware functions. 
******************************************************************************** 
* History: 
* 05/21/2007: V0.3 
* 04/02/2007: V0.2 
* 02/05/2007: V0.1 
* 09/29/2006: V0.01 
******************************************************************************** 
* THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS 
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. 
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, 
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE 
* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING 
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. 
*******************************************************************************/ 
 
/* Includes ------------------------------------------------------------------*/ 
#include "stm32f10x_systick.h" 
 
/* Private typedef -----------------------------------------------------------*/ 
/* Private define ------------------------------------------------------------*/ 
/* ---------------------- SysTick registers bit mask -------------------- */ 
/* CTRL TICKINT Mask */ 
#define CTRL_TICKINT_Set      ((u32)0x00000002) 
#define CTRL_TICKINT_Reset    ((u32)0xFFFFFFFD) 
 
/* SysTick Flag Mask */ 
#define FLAG_Mask             ((u8)0x1F) 
 
/* Private macro -------------------------------------------------------------*/ 
/* Private variables ---------------------------------------------------------*/ 
/* Private function prototypes -----------------------------------------------*/ 
/* Private functions ---------------------------------------------------------*/ 
 
/******************************************************************************* 
* Function Name  : SysTick_CLKSourceConfig 
* Description    : Configures the SysTick clock source. 
* Input          : - SysTick_CLKSource: specifies the SysTick clock source. 
*                    This parameter can be one of the following values: 
*                       - SysTick_CLKSource_HCLK_Div8: AHB clock divided by 8 
*                         selected as SysTick clock source. 
*                       - SysTick_CLKSource_HCLK: AHB clock selected as 
*                         SysTick clock source. 
* Output         : None 
* Return         : None 
*******************************************************************************/ 
void SysTick_CLKSourceConfig(u32 SysTick_CLKSource) 
{ 
  /* Check the parameters */ 
  assert(IS_SYSTICK_CLK_SOURCE(SysTick_CLKSource)); 
 
  if (SysTick_CLKSource == SysTick_CLKSource_HCLK) 
  { 
    SysTick->CTRL |= SysTick_CLKSource_HCLK; 
  } 
  else 
  { 
    SysTick->CTRL &= SysTick_CLKSource_HCLK_Div8; 
  } 
} 
 
/******************************************************************************* 
* Function Name  : SysTick_SetReload 
* Description    : Sets SysTick Reload value. 
* Input          : - Reload: SysTick Reload new value. 
*                    This parameter must be a number between 1 and 0xFFFFFF. 
* Output         : None 
* Return         : None 
*******************************************************************************/ 
void SysTick_SetReload(u32 Reload) 
{ 
  /* Check the parameters */ 
  assert(IS_SYSTICK_RELOAD(Reload)); 
 
  SysTick->LOAD = Reload; 
} 
 
/******************************************************************************* 
* Function Name  : SysTick_CounterCmd 
* Description    : Enables or disables the SysTick counter. 
* Input          : - SysTick_Counter: new state of the SysTick counter. 
*                    This parameter can be one of the following values: 
*                       - SysTick_Counter_Disable: Disable counter 
*                       - SysTick_Counter_Enable: Enable counter 
*                       - SysTick_Counter_Clear: Clear counter value to 0 
* Output         : None 
* Return         : None 
*******************************************************************************/ 
void SysTick_CounterCmd(u32 SysTick_Counter) 
{ 
  /* Check the parameters */ 
  assert(IS_SYSTICK_COUNTER(SysTick_Counter)); 
 
  if (SysTick_Counter == SysTick_Counter_Clear) 
  { 
    SysTick->VAL = SysTick_Counter_Clear; 
  } 
  else 
  { 
    if (SysTick_Counter == SysTick_Counter_Enable) 
    { 
      SysTick->CTRL |= SysTick_Counter_Enable; 
    } 
    else 
    { 
      SysTick->CTRL &= SysTick_Counter_Disable; 
    } 
  } 
} 
 
/******************************************************************************* 
* Function Name  : SysTick_ITConfig 
* Description    : Enables or disables the SysTick Interrupt. 
* Input          : - NewState: new state of the SysTick Interrupt. 
*                    This parameter can be: ENABLE or DISABLE. 
* Output         : None 
* Return         : None 
*******************************************************************************/ 
void SysTick_ITConfig(FunctionalState NewState) 
{ 
  /* Check the parameters */ 
  assert(IS_FUNCTIONAL_STATE(NewState)); 
 
  if (NewState != DISABLE) 
  { 
    SysTick->CTRL |= CTRL_TICKINT_Set; 
  } 
  else 
  { 
    SysTick->CTRL &= CTRL_TICKINT_Reset; 
  } 
} 
 
/******************************************************************************* 
* Function Name  : SysTick_GetCounter 
* Description    : Gets SysTick counter value. 
* Input          : None 
* Output         : None 
* Return         : SysTick current value 
*******************************************************************************/ 
u32 SysTick_GetCounter(void) 
{ 
  return(SysTick->VAL); 
} 
 
/******************************************************************************* 
* Function Name  : SysTick_GetFlagStatus 
* Description    : Checks whether the specified SysTick flag is set or not. 
* Input          : - SysTick_FLAG: specifies the flag to check. 
*                    This parameter can be one of the following values: 
*                       - SysTick_FLAG_COUNT 
*                       - SysTick_FLAG_SKEW 
*                       - SysTick_FLAG_NOREF 
* Output         : None 
* Return         : None 
*******************************************************************************/ 
FlagStatus SysTick_GetFlagStatus(u8 SysTick_FLAG) 
{ 
  u32 tmp = 0; 
  u32 statusreg = 0; 
  FlagStatus bitstatus = RESET; 
 
  /* Check the parameters */ 
  assert(IS_SYSTICK_FLAG(SysTick_FLAG)); 
 
  /* Get the SysTick register index */ 
  tmp = SysTick_FLAG >> 5; 
 
  if (tmp == 1) /* The flag to check is in CTRL register */ 
  { 
    statusreg = SysTick->CTRL; 
  } 
  else          /* The flag to check is in CALIB register */ 
  { 
    statusreg = SysTick->CALIB; 
  } 
 
  /* Get the flag position */ 
  tmp = SysTick_FLAG & FLAG_Mask; 
 
  if ((statusreg & ((u32)1 << tmp)) != (u32)RESET) 
  { 
    bitstatus = SET; 
  } 
  else 
  { 
    bitstatus = RESET; 
  } 
  return bitstatus; 
} 
 
/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/