/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
* File Name          : main.c
* Author             : MCD Application Team
* Date First Issued  : 05/21/2007
* Description        : TIM Example 10 Main program body
********************************************************************************
* History:
* 05/21/2007: V0.3
********************************************************************************
* 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_lib.h"

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

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

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

/*******************************************************************************
* Function Name  : main
* Description    : Main program
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
  debug();
#endif

  /* System Clocks Configuration */
  RCC_Configuration();
       
  /* NVIC configuration */
  NVIC_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 0x2 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 = 0x49;          
  TIM_TimeBaseStructure.TIM_Prescaler = 0x2;       
  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;    
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; 
  
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
 
  TIM_TimeBaseStructure.TIM_Period = 0x49;
  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

  TIM_TimeBaseStructure.TIM_Period = 0x49;
  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

  /* Master Configuration in Toggle Mode */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;          
  TIM_OCInitStructure.TIM_Channel = TIM_Channel_1;          
  TIM_OCInitStructure.TIM_Pulse = 0x3F;  
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    
  TIM_OCInit(TIM2, &TIM_OCInitStructure); 

  /* TIM2 Input Capture Configuration */
  TIM_ICInitStructure.TIM_ICMode = TIM_ICMode_ICAP;
  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 = 0x0;

  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_Channel = TIM_Channel_1;          
  
  TIM_OCInit(TIM3, &TIM_OCInitStructure); 

  TIM_OCInit(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)
  {
  }
}

/*******************************************************************************
* Function Name  : RCC_Configuration
* Description    : Configures the different system clocks.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RCC_Configuration(void)
{   
  /* RCC system reset(for debug purpose) */
  RCC_DeInit();

  /* Enable HSE */
  RCC_HSEConfig(RCC_HSE_ON);

  /* Wait till HSE is ready */
  HSEStartUpStatus = RCC_WaitForHSEStartUp();

  if(HSEStartUpStatus == SUCCESS)
  {
    /* HCLK = SYSCLK */
    RCC_HCLKConfig(RCC_SYSCLK_Div1); 
  
    /* PCLK2 = HCLK */
    RCC_PCLK2Config(RCC_HCLK_Div1); 

    /* PCLK1 = HCLK/2 */
    RCC_PCLK1Config(RCC_HCLK_Div2);

    /* Flash 2 wait state */
    FLASH_SetLatency(FLASH_Latency_2);
    /* Enable Prefetch Buffer */
    FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

    /* PLLCLK = 8MHz * 9 = 72 MHz */
    RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);

    /* Enable PLL */ 
    RCC_PLLCmd(ENABLE);

    /* Wait till PLL is ready */
    while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
    {
    }

    /* Select PLL as system clock source */
    RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

    /* Wait till PLL is used as system clock source */
    while(RCC_GetSYSCLKSource() != 0x08)
    {
    }
  }
  /* 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);
}

/*******************************************************************************
* Function Name  : GPIO_Configuration
* Description    : Configure the GPIO Pins.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* GPIOA Configuration: PA.00(TIM2 CH1) and PA.06(TIM3 CH1) */
  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) */
  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);
}

/*******************************************************************************
* Function Name  : NVIC_Configuration
* Description    : Configures Vector Table base location.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void NVIC_Configuration(void)
{
#ifdef  VECT_TAB_RAM  
  /* Set the Vector Table base location at 0x20000000 */ 
  NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0); 
#else  /* VECT_TAB_FLASH  */
  /* Set the Vector Table base location at 0x08000000 */ 
  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);   
#endif
}

#ifdef  DEBUG
/*******************************************************************************
* Function Name  : assert_failed
* Description    : Reports the name of the source file and the source line number
*                  where the assert error has occurred.
* Input          : - file: pointer to the source file name
*                  - line: assert error line source number
* Output         : None
* Return         : None
*******************************************************************************/
void assert_failed(u8* file, u32 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 2007 STMicroelectronics *****END OF FILE****/