main.c

STM32F4-Discovery MEMS keil&iar例程

/**
  ******************************************************************************
  * @file    LIS302DL/main.c 
  * @author  MCD Application Team
  * @version V1.0.0
  * @date    19-September-2011
  * @brief   Main program body
  ******************************************************************************
  * @attention
  *
  * THE PRESENT FIRMWARE 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 FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  *
  * <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>
  ******************************************************************************  
  */ 

/* Includes ------------------------------------------------------------------*/
#include "main.h"

/** @addtogroup STM32F4_Discovery_Peripheral_Examples
  * @{
  */

/** @addtogroup LIS302DL_Example
  * @{
  */ 

/* Private typedef -----------------------------------------------------------*/
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
uint16_t PrescalerValue = 0;
uint8_t Buffer[6];
__IO uint32_t TimingDelay = 0;
__IO int8_t XOffset;
__IO int8_t YOffset;

__IO uint8_t SingleClickDetect = 0x00;
extern uint8_t ClickReg;

/* Private function prototypes -----------------------------------------------*/
static void TIM_Config(void);

/* Private functions ---------------------------------------------------------*/

/**
  * @brief   Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  uint8_t ctrl = 0;
  
  LIS302DL_InitTypeDef  LIS302DL_InitStruct;
  LIS302DL_InterruptConfigTypeDef LIS302DL_InterruptStruct;  
  
  /* SysTick end of count event each 10ms */
  SysTick_Config(SystemCoreClock/ 100);
  
  /* Set configuration of LIS302DL*/
  LIS302DL_InitStruct.Power_Mode = LIS302DL_LOWPOWERMODE_ACTIVE;
  LIS302DL_InitStruct.Output_DataRate = LIS302DL_DATARATE_100;
  LIS302DL_InitStruct.Axes_Enable = LIS302DL_X_ENABLE | LIS302DL_Y_ENABLE | LIS302DL_Z_ENABLE;
  LIS302DL_InitStruct.Full_Scale = LIS302DL_FULLSCALE_2_3;
  LIS302DL_InitStruct.Self_Test = LIS302DL_SELFTEST_NORMAL;
  LIS302DL_Init(&LIS302DL_InitStruct);
    
  /* Set configuration of Internal High Pass Filter of LIS302DL*/
  LIS302DL_InterruptStruct.Latch_Request = LIS302DL_INTERRUPTREQUEST_LATCHED;
  LIS302DL_InterruptStruct.SingleClick_Axes = LIS302DL_CLICKINTERRUPT_Z_ENABLE;
  LIS302DL_InterruptStruct.DoubleClick_Axes = LIS302DL_DOUBLECLICKINTERRUPT_Z_ENABLE;
  LIS302DL_InterruptConfig(&LIS302DL_InterruptStruct);

  /* Required delay for the MEMS Accelerometre: Turn-on time = 3/Output data Rate 
                                                             = 3/100 = 30ms */
  Delay(30);
  
  /* Configure Interrupt control register: enable Click interrupt1 */
  ctrl = 0x07;
  LIS302DL_Write(&ctrl, LIS302DL_CTRL_REG3_ADDR, 1);
  
  /* Enable Interrupt generation on click/double click on Z axis */
  ctrl = 0x70;
  LIS302DL_Write(&ctrl, LIS302DL_CLICK_CFG_REG_ADDR, 1);
  
  /* Configure Click Threshold on X/Y axis (10 x 0.5g) */
  ctrl = 0xAA;
  LIS302DL_Write(&ctrl, LIS302DL_CLICK_THSY_X_REG_ADDR, 1);
  
  /* Configure Click Threshold on Z axis (10 x 0.5g) */
  ctrl = 0x0A;
  LIS302DL_Write(&ctrl, LIS302DL_CLICK_THSZ_REG_ADDR, 1);
  
  /* Configure Time Limit */
  ctrl = 0x03;
  LIS302DL_Write(&ctrl, LIS302DL_CLICK_TIMELIMIT_REG_ADDR, 1);
    
  /* Configure Latency */
  ctrl = 0x7F;
  LIS302DL_Write(&ctrl, LIS302DL_CLICK_LATENCY_REG_ADDR, 1);
  
  /* Configure Click Window */
  ctrl = 0x7F;
  LIS302DL_Write(&ctrl, LIS302DL_CLICK_WINDOW_REG_ADDR, 1);
  
  /* TIM configuration -------------------------------------------------------*/
  TIM_Config(); 
  LIS302DL_Read(Buffer, LIS302DL_OUT_X_ADDR, 6);
                  
  XOffset = Buffer[0];
  YOffset = Buffer[2];
    
  while(1)
  {
    if (SingleClickDetect != 0)
    {
      Delay(50);
      /* Read click status register */
      LIS302DL_Read(&ClickReg, LIS302DL_CLICK_SRC_REG_ADDR, 1); 
      
      if(ClickReg == DOUBLECLICK_Z) 
      {
        /* Enable TIM4 Capture Compare Channel 1 */
        TIM_CCxCmd(TIM4, TIM_Channel_1, ENABLE);
        /* Sets the TIM4 Capture Compare1 Register value */
        TIM_SetCompare1(TIM4, TIM_CCR/12);
        /* Enable TIM4 Capture Compare Channel 2 */
        TIM_CCxCmd(TIM4, TIM_Channel_2, ENABLE);
        /* Sets the TIM4 Capture Compare2 Register value */
        TIM_SetCompare2(TIM4, TIM_CCR/12);
        /* Enable TIM4 Capture Compare Channel 3 */
        TIM_CCxCmd(TIM4, TIM_Channel_3, ENABLE);
        /* Sets the TIM4 Capture Compare3 Register value */
        TIM_SetCompare3(TIM4, TIM_CCR/12);
        /* Enable TIM4 Capture Compare Channel 4 */
        TIM_CCxCmd(TIM4, TIM_Channel_4, ENABLE);
        /* Sets the TIM4 Capture Compare4 Register value */
        TIM_SetCompare4(TIM4, TIM_CCR/12);
        
        /* Time base configuration */
        TIM_SetAutoreload(TIM4, TIM_ARR/12);
        Delay(200);
        
        /* Clear the click status register by reading it */
        LIS302DL_Read(&ClickReg, LIS302DL_CLICK_SRC_REG_ADDR, 1);
        
        /* Reset the single click detect */
        SingleClickDetect = 0x00;
      }
      else
      {
        /* Disable TIM4 Capture Compare Channel 1/3 */
        TIM_CCxCmd(TIM4, TIM_Channel_1, DISABLE);
        TIM_CCxCmd(TIM4, TIM_Channel_3, DISABLE);
        
        /* Enable TIM4 Capture Compare Channel 2 */
        TIM_CCxCmd(TIM4, TIM_Channel_2, ENABLE);
        /* Sets the TIM4 Capture Compare2 Register value */
        TIM_SetCompare2(TIM4, TIM_CCR/12);

        /* Enable TIM4 Capture Compare Channel 4 */
        TIM_CCxCmd(TIM4, TIM_Channel_4, ENABLE);
        /* Sets the TIM4 Capture Compare4 Register value */
        TIM_SetCompare4(TIM4, TIM_CCR/12);
        
        /* Time base configuration */
        TIM_SetAutoreload(TIM4, TIM_ARR/12);
        Delay(200);   
        SingleClickDetect = 0;
      }
    }
  }
}

/**
  * @brief  Configures the TIM Peripheral.
  * @param  None
  * @retval None
  */
static void TIM_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  TIM_OCInitTypeDef  TIM_OCInitStructure;
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  
  /* --------------------------- System Clocks Configuration -----------------*/
  /* TIM4 clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
  
  /* GPIOD clock enable */
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
  
  /*-------------------------- GPIO Configuration ----------------------------*/
  /* GPIOD Configuration: Pins 12, 13, 14 and 15 in output push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_Init(GPIOD, &GPIO_InitStructure);

  /* Connect TIM4 pins to AF2 */  
  GPIO_PinAFConfig(GPIOD, GPIO_PinSource12, GPIO_AF_TIM4);
  GPIO_PinAFConfig(GPIOD, GPIO_PinSource13, GPIO_AF_TIM4); 
  GPIO_PinAFConfig(GPIOD, GPIO_PinSource14, GPIO_AF_TIM4);
  GPIO_PinAFConfig(GPIOD, GPIO_PinSource15, GPIO_AF_TIM4); 
  
    /* -----------------------------------------------------------------------
    TIM4 Configuration: Output Compare Timing Mode:
    
    In this example TIM4 input clock (TIM4CLK) is set to 2 * APB1 clock (PCLK1), 
    since APB1 prescaler is different from 1 (APB1 Prescaler = 4, see system_stm32f4xx.c file).
      TIM4CLK = 2 * PCLK1  
      PCLK1 = HCLK / 4 
      => TIM4CLK = 2*(HCLK / 4) = HCLK/2 = SystemCoreClock/2
         
    To get TIM4 counter clock at 2 KHz, the prescaler is computed as follows:
       Prescaler = (TIM4CLK / TIM1 counter clock) - 1
       Prescaler = (168 MHz/(2 * 2 KHz)) - 1 = 41999
                                        
    To get TIM4 output clock at 1 Hz, the period (ARR)) is computed as follows:
       ARR = (TIM4 counter clock / TIM4 output clock) - 1
           = 1999
                    
    TIM4 Channel1 duty cycle = (TIM4_CCR1/ TIM4_ARR)* 100 = 50%
    TIM4 Channel2 duty cycle = (TIM4_CCR2/ TIM4_ARR)* 100 = 50%
    TIM4 Channel3 duty cycle = (TIM4_CCR3/ TIM4_ARR)* 100 = 50%
    TIM4 Channel4 duty cycle = (TIM4_CCR4/ TIM4_ARR)* 100 = 50%
    
    ==> TIM4_CCRx = TIM4_ARR/2 = 1000  (where x = 1, 2, 3 and 4).
  
    Note: 
     SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f4xx.c file.
     Each time the core clock (HCLK) changes, user had to call SystemCoreClockUpdate()
     function to update SystemCoreClock variable value. Otherwise, any configuration
     based on this variable will be incorrect.    
  ----------------------------------------------------------------------- */ 
    
  /* Compute the prescaler value */
  PrescalerValue = (uint16_t) ((SystemCoreClock /2) / 2000) - 1;
  
  /* Time base configuration */
  TIM_TimeBaseStructure.TIM_Period = TIM_ARR;
  TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
  
  /* Enable TIM4 Preload register on ARR */
  TIM_ARRPreloadConfig(TIM4, ENABLE);
  
  /* TIM PWM1 Mode configuration: Channel */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = TIM_CCR;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
  
  /* Output Compare PWM1 Mode configuration: Channel1 */
  TIM_OC1Init(TIM4, &TIM_OCInitStructure);
  TIM_CCxCmd(TIM4, TIM_Channel_1, DISABLE);
  
  TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable);
  
  /* Output Compare PWM1 Mode configuration: Channel2 */
  TIM_OC2Init(TIM4, &TIM_OCInitStructure);
  TIM_CCxCmd(TIM4, TIM_Channel_2, DISABLE);
  
  TIM_OC2PreloadConfig(TIM4, TIM_OCPreload_Enable);
    
  /* Output Compare PWM1 Mode configuration: Channel3 */
  TIM_OC3Init(TIM4, &TIM_OCInitStructure);
  TIM_CCxCmd(TIM4, TIM_Channel_3, DISABLE);
  
  TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable);
  
  /* Output Compare PWM1 Mode configuration: Channel4 */
  TIM_OC4Init(TIM4, &TIM_OCInitStructure);
  TIM_CCxCmd(TIM4, TIM_Channel_4, DISABLE);
  
  TIM_OC4PreloadConfig(TIM4, TIM_OCPreload_Enable);
  
  /* TIM4 enable counter */
  TIM_Cmd(TIM4, ENABLE);
}

/**
  * @brief  Inserts a delay time.
  * @param  nTime: specifies the delay time length, in milliseconds.
  * @retval None
  */
void Delay(__IO uint32_t nTime)
{ 
  TimingDelay = nTime;

  while(TimingDelay != 0);
}

/**
  * @brief  Decrements the TimingDelay variable.
  * @param  None
  * @retval None
  */
void TimingDelay_Decrement(void)
{
  if (TimingDelay != 0x00)
  { 
    TimingDelay--;
  }
}

/**
  * @brief  MEMS accelerometre management of the timeout situation.
  * @param  None.
  * @retval None.
  */
uint32_t LIS302DL_TIMEOUT_UserCallback(void)
{
  /* MEMS Accelerometer Timeout error occured */
  while (1)
  {   
  }
}

#ifdef  USE_FULL_ASSERT

/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t* file, uint32_t line)
{ 
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

  /* Infinite loop */
  while (1)
  {
  }
}
#endif

/**
  * @}
  */ 

/**
  * @}
  */ 

/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/