定时器的主从模式为什么不能验证不了

Zoepreal

/**
   ******************************************************************************
   * @file    TIM/Cascade_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_Cascade_Synchro
   * @{
   */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
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();

   /* GPIO Configuration */
   GPIO_Configuration();

   /* Timers synchronisation in cascade mode ----------------------------
      1/TIM2 is configured as Master Timer:
      - PWM Mode is used
      - The TIM2 Update event is used as Trigger Output  

      2/TIM3 is slave for TIM2 and Master for TIM4,
      - PWM 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 update event).
       - The TIM3 Update event is used as Trigger Output.

       3/TIM4 is slave for TIM3,
      - PWM 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 update event).

      * For Low-density, Medium-density, High-density and Connectivity line devices:
        The TIMxCLK is fixed to 72 MHz, the TIM2 counter clock is 72 MHz.

        The Master Timer TIM2 is running at TIM2 frequency :
        TIM2 frequency = (TIM2 counter clock)/ (TIM2 period + 1) = 281.250 KHz
        and the duty cycle = TIM2_CCR1/(TIM2_ARR + 1) = 25%.

        The TIM3 is running:
        - At (TIM2 frequency)/ (TIM3 period + 1) = 70.312 KHz and a duty cycle
          equal to TIM3_CCR1/(TIM3_ARR + 1) = 25%

         The TIM4 is running:
       - At (TIM3 frequency)/ (TIM4 period + 1) = 17.578 KHz and a duty cycle
         equal to TIM4_CCR1/(TIM4_ARR + 1) = 25%

      * For Low-Density Value line,Medium-Density and High-Density Value line devices:
        The TIMxCLK is fixed to 24 MHz, the TIM2 counter clock is 24 MHz.
        So TIM2 frequency = 93.750 KHz,
        TIM3 is running at 23.437 KHz,
        and TIM4 is running at 5.85 KHz
   -------------------------------------------------------------------- */

   /* Time base configuration */
   TIM_TimeBaseStructure.TIM_Period = 255;
   TIM_TimeBaseStructure.TIM_Prescaler = 0;
   TIM_TimeBaseStructure.TIM_ClockDivision = 0;
   TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

   TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

   TIM_TimeBaseStructure.TIM_Period = 3;
   TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

   TIM_TimeBaseStructure.TIM_Period = 3;
   TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

   /* Master Configuration in PWM1 Mode */
   TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
   TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
   TIM_OCInitStructure.TIM_Pulse = 64;
   TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

   TIM_OC1Init(TIM2, &TIM_OCInitStructure);

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

   /* Master Mode selection */
   TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);

   /* Slaves Configuration: PWM1 Mode */
   TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
   TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
   TIM_OCInitStructure.TIM_Pulse = 1;

   TIM_OC1Init(TIM3, &TIM_OCInitStructure);

   TIM_OC1Init(TIM4, &TIM_OCInitStructure);

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

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

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

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

   /* 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)
{  
   /* TIM2, TIM3 and TIM4 clock enable */
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 | RCC_APB1Periph_TIM3 |
                          RCC_APB1Periph_TIM4, ENABLE);

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

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

#ifdef STM32F10X_CL
   /*GPIOB Configuration:  PC6(TIM3 CH1) as alternate function push-pull */
   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);     

#else
/* GPIOA Configuration: PA6(TIM3 CH1) as alternate function push-pull */
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

   GPIO_Init(GPIOA, &GPIO_InitStructure);
#endif
   /* GPIOA Configuration: PA0(TIM2 CH1) as alternate function push-pull */
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

   GPIO_Init(GPIOA, &GPIO_InitStructure);

   /* GPIOB Configuration: PB6(TIM4 CH1) as alternate function push-pull */
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;

   GPIO_Init(GPIOB, &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 2011 STMicroelectronics *****END OF FILE****/

Zoepreal

这是官方库的例子，但是TIM4_CH1(PB6)没有PWM输出啊？@fire

Zoepreal

请大神看看

Zoepreal

@flyleaf 帮忙分析一下啊

flyleaf

用我们的例子来试下

Zoepreal

flyleaf 发表于 2016-3-16 08:46
用我们的例子来试下

我买的是minni-v2 例程中没有定时器主从模式的例子。。。我没法试。。。难道两级的主从模式不行吗？
我发现 TIM_SelectInputTrigger(TIM4, TIM_TS_ITR2);TIM_TS_ITR2没有内部触发的了TIM4;改为(TIM4, TIM_TS_ITR1)就可以但是产生是和TIM3一样的PWM，这是为什么啊？

flyleaf

Zoepreal 发表于 2016-3-16 09:34
我买的是minni-v2 例程中没有定时器主从模式的例子。。。我没法试。。。难道两级的主从模式不行吗？
我 ...

没试过主从模式

Zoepreal

@fire 火哥过两眼