main.c

STM32 库文件

/**
  ******************************************************************************
  * @file TIM/ExtTrigger_Synchro/main.c 
  * @author  MCD Application Team
  * @version  V3.0.0
  * @date  04/06/2009
  * @brief  Main program body
  ******************************************************************************
  * @copy
  *
  * 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 2009 STMicroelectronics</center></h2>
  */ 

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"

/** @addtogroup StdPeriph_Examples
  * @{
  */

/** @addtogroup TIM_ExtTrigger_Synchro
  * @{
  */ 

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_ICInitTypeDef  TIM_ICInitStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);

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

/**
  * @brief  Main program
  * @param  None
  * @retval : None
  */
int main(void)
{
  /* System Clocks Configuration */
  RCC_Configuration();

  /* Configure the GPIO ports */
  GPIO_Configuration();

  /* Timers synchronisation in cascade mode with an external trigger -----
     1/TIM2 is configured as Master Timer:
     - Toggle Mode is used
     - The TIM2 Enable event is used as Trigger Output 

     2/TIM2 is configured as Slave Timer for an external Trigger connected
      to TIM2 TI2 pin (TIM2 CH2 configured as input pin):
      - The TIM2 TI2FP2 is used as Trigger Input
      - Rising edge is used to start and stop the TIM2: Gated Mode.

     3/TIM3 is slave for TIM2 and Master for TIM4,
     - Toggle Mode is used
     - The ITR1(TIM2) is used as input trigger 
     - Gated mode is used, so start and stop of slave counter
      are controlled by the Master trigger output signal(TIM2 enable event).
      - The TIM3 enable event is used as Trigger Output. 

      4/TIM4 is slave for TIM3,
      - Toggle Mode is used
      - The ITR2(TIM3) is used as input trigger
      - Gated mode is used, so start and stop of slave counter
       are controlled by the Master trigger output signal(TIM3 enable event).

     The TIMxCLK is fixed to 72 MHZ, the Prescaler is equal to 2 so the TIMx clock counter
     is equal to 24 MHz.
     The Three Timers are running at: 
     TIMx frequency = TIMx clock counter/ 2*(TIMx_Period + 1) = 162.1 KHz.

     The starts and stops of the TIM2 counters are controlled by the 
     external trigger.
     The TIM3 starts and stops are controlled by the TIM2, and the TIM4 
     starts and stops are controlled by the TIM3.  
  -------------------------------------------------------------------- */

  /* Time base configuration */
  TIM_TimeBaseStructure.TIM_Period = 73;
  TIM_TimeBaseStructure.TIM_Prescaler = 2;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

  TIM_TimeBaseStructure.TIM_Period = 73;
  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

  TIM_TimeBaseStructure.TIM_Period = 73;
  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

  /* Master Configuration in Toggle Mode */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 64;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

  TIM_OC1Init(TIM2, &TIM_OCInitStructure);

  /* TIM2 Input Capture Configuration */
  TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
  TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
  TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
  TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
  TIM_ICInitStructure.TIM_ICFilter = 0;

  TIM_ICInit(TIM2, &TIM_ICInitStructure);

  /* TIM2 Input trigger configuration: External Trigger connected to TI2 */
  TIM_SelectInputTrigger(TIM2, TIM_TS_TI2FP2);
  TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Gated);

  /* Select the Master Slave Mode */
  TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable);

  /* Master Mode selection: TIM2 */
  TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Enable);

  /* Slaves Configuration: Toggle Mode */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

  TIM_OC1Init(TIM3, &TIM_OCInitStructure);

  TIM_OC1Init(TIM4, &TIM_OCInitStructure);

  /* Slave Mode selection: TIM3 */
  TIM_SelectInputTrigger(TIM3, TIM_TS_ITR1);
  TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Gated);

  /* Select the Master Slave Mode */
  TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable);

  /* Master Mode selection: TIM3 */
  TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Enable);

  /* Slave Mode selection: TIM4 */
  TIM_SelectInputTrigger(TIM4, TIM_TS_ITR2);
  TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Gated);

  /* TIM enable counter */
  TIM_Cmd(TIM2, ENABLE);
  TIM_Cmd(TIM3, ENABLE);
  TIM_Cmd(TIM4, ENABLE);

  while (1)
  {}
}

/**
  * @brief  Configures the different system clocks.
  * @param  None
  * @retval : None
  */
void RCC_Configuration(void)
{
  /* Setup the microcontroller system. Initialize the Embedded Flash Interface,  
     initialize the PLL and update the SystemFrequency variable. */
  SystemInit();
  
  /* TIM2, TIM3 and TIM4 clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 | RCC_APB1Periph_TIM3 |
                         RCC_APB1Periph_TIM4, ENABLE);

  /* GPIOA and GPIOB clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);
}

/**
  * @brief  Configure the GPIO Pins.
  * @param  None
  * @retval : None
  */
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* GPIOA Configuration: PA.00(TIM2 CH1) and PA.06(TIM3 CH1) as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_6;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* GPIOB Configuration: PB.06(TIM4 CH1) as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;

  GPIO_Init(GPIOB, &GPIO_InitStructure);

  /* GPIOA Configuration: PA.01(TIM2 CH2) */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

  GPIO_Init(GPIOA, &GPIO_InitStructure);
}

#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) */

  while (1)
  {}
}
#endif

/**
  * @}
  */ 

/**
  * @}
  */ 

/******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/