/**
  ******************************************************************************
  * @file    TIM/ExtTrigger_Synchro/main.c 
  * @author  MCD Application Team
  * @version V3.5.0
  * @date    08-April-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 "stm32f10x.h"

/** @addtogroup STM32F10x_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)
{
  /*!< At this stage the microcontroller clock setting is already configured, 
       this is done through SystemInit() function which is called from startup
       file (startup_stm32f10x_xx.s) before to branch to application main.
       To reconfigure the default setting of SystemInit() function, refer to
       system_stm32f10x.c file
     */     
       
  /* System Clocks Configuration */
  RCC_Configuration();

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

  /* Timers synchronisation in cascade mode with an external trigger -----
    1/TIM1 is configured as Master Timer:
     - Toggle Mode is used
     - The TIM1 Enable event is used as Trigger Output 

    2/TIM1 is configured as Slave Timer for an external Trigger connected
     to TIM1 TI2 pin (TIM1 CH2 configured as input pin):
     - The TIM1 TI2FP2 is used as Trigger Input
     - Rising edge is used to start and stop the TIM1: Gated Mode.

    3/TIM3 is slave for TIM1 and Master for TIM4,
     - Toggle Mode is used
     - The ITR1(TIM1) is used as input trigger 
     - Gated mode is used, so start and stop of slave counter
       are controlled by the Master trigger output signal(TIM1 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).

    * For Low-density, Medium-density, High-density and Connectivity line devices:
      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.

    * For Low-Density Value line and Medium-Density Value line devices:
      The TIMxCLK is fixed to 24 MHz, the Prescaler is equal to 2 so the TIMx clock 
      counter is equal to 8 MHz.
      TIMx frequency = TIMx clock counter/ 2*(TIMx_Period + 1) = 54 KHz.

    The starts and stops of the TIM1 counters are controlled by the 
    external trigger.
    The TIM3 starts and stops are controlled by the TIM1, 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(TIM1, &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(TIM1, &TIM_OCInitStructure);

  /* TIM1 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(TIM1, &TIM_ICInitStructure);

  /* TIM1 Input trigger configuration: External Trigger connected to TI2 */
  TIM_SelectInputTrigger(TIM1, TIM_TS_TI2FP2);
  TIM_SelectSlaveMode(TIM1, TIM_SlaveMode_Gated);

  /* Select the Master Slave Mode */
  TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Enable);

  /* Master Mode selection: TIM1 */
  TIM_SelectOutputTrigger(TIM1, 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_ITR0);
  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);
  
  /* TIM1 Main Output Enable */
  TIM_CtrlPWMOutputs(TIM1, ENABLE);

  /* TIM enable counter */
  TIM_Cmd(TIM1, 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)
{
  /* TIM1, TIM3 and TIM4 clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3 |
                         RCC_APB1Periph_TIM4, ENABLE);

  /* TIM1, GPIOA, GPIOE, GPIOC and GPIOB clocks enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |
                         RCC_APB2Periph_GPIOE | RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);
}

/**
  * @brief  Configure the GPIO Pins.
  * @param  None
  * @retval None
  */
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
#ifdef STM32F10X_CL
  /* GPIOE Configuration: Channel 1 as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_Init(GPIOE, &GPIO_InitStructure);

   /* GPIOE Configuration: Channel 2 as Input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

  GPIO_Init(GPIOE, &GPIO_InitStructure);

  /* TIM1 Full remapping pins */
  GPIO_PinRemapConfig(GPIO_FullRemap_TIM1, ENABLE); 

 /*GPIOB Configuration: TIM3 channel1, 2, 3 and 4 */
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_Init(GPIOC, &GPIO_InitStructure);

  GPIO_PinRemapConfig(GPIO_FullRemap_TIM3, ENABLE);	

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

  GPIO_Init(GPIOB, &GPIO_InitStructure);

#else
  /* GPIOA Configuration: PA.08(TIM1 CH1) and PA.06(TIM3 CH1) as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | 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.09(TIM1 CH2) */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

  GPIO_Init(GPIOA, &GPIO_InitStructure);

#endif

}

#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 2011 STMicroelectronics *****END OF FILE****/