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发表于 2013-7-28 16:31:49
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回复【4楼】正点原子:
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的确是一样的 可是将例程中的主模式TIM2换成TIM3就不行 这个说不通啊，下面是程序代码，这个程序可以使用，如果把TIM2换成TIM3就行不通。
/**
******************************************************************************
* @file TIM/Parallel_Synchro/main.c
* @author MCD Application Team
* @version V3.0.0
* @date 04/06/2009
* @brief Main program body
******************************************************************************
* @copy
*
* THE  RESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT ROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR RODUCTS 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 RODUCTS.
*
* <h2><center>© COPYRIGHT 2009 STMicroelectronics</center></h2>
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
/** @addtogroup StdPeriph_Examples
* @{
*/
/** @addtogroup TIM_Parallel_Synchro
* @{
*/
/* rivate typedef -----------------------------------------------------------*/
/* rivate define ------------------------------------------------------------*/
/* rivate macro -------------------------------------------------------------*/
/* rivate variables ---------------------------------------------------------*/
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
/* rivate function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
/* rivate functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval: None
*/
int main(void)
{
/* System Clocks Configuration */
RCC_Configuration();
/* GPIO Configuration */
GPIO_Configuration();
/* Timers synchronisation in parallel mode ----------------------------
1/TIM3 is configured as Master Timer:
- PWM Mode is used
- The TIM2 Update event is used as Trigger Output
2/TIM1 and TIM2 are slaves for TIM3,
- PWM Mode is used
- The ITR1(TIM3) is used as input trigger for both slaves
- Gated mode is used, so starts and stops of slaves counters
are controlled by the Master trigger output signal(update event).
The TIMxCLK is fixed to 72 MHz, the TIM3 counter clock is 72 MHz.
The Master Timer TIM2 is running at 281.250 KHz and the duty cycle
is equal to 25%
The TIM3 is running:
- At (TIM2 frequency)/ (TIM3 period + 1) = 28.125 KHz and a duty cycle
equal to TIM3_CCR1/(TIM3_ARR + 1) = 30%
The TIM4 is running:
- At (TIM2 frequency)/ (TIM4 period + 1) = 56.250 KHz and a duty cycle
equal to TIM4_CCR1/(TIM4_ARR + 1) = 60%
-------------------------------------------------------------------- */
/* 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 = 9;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = 4;
TIM_TimeBaseInit(TIM1, &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 = 3;
TIM_OC1Init(TIM4, &TIM_OCInitStructure);
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
/* Slave Mode selection: TIM3 */
TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Gated);
TIM_SelectInputTrigger(TIM4, TIM_TS_ITR1);
/* Slave Mode selection: TIM4 */
TIM_SelectSlaveMode(TIM1, TIM_SlaveMode_Gated);
TIM_SelectInputTrigger(TIM1, TIM_TS_ITR1);
/* TIM enable counter */
TIM_Cmd(TIM4, ENABLE);
TIM_Cmd(TIM2, ENABLE);
TIM_Cmd(TIM1, ENABLE);
TIM_CtrlPWMOutputs(TIM1, 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);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
/* GPIOA and GPIOB clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);
}
/**
* @brief Configure the GPIOD Pins.
* @param None
* @retval: None
*/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* GPIOA Configuration: PA0(TIM2 CH1) and PA6(TIM3 CH1) as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_6 | GPIO_Pin_8;
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 2009 STMicroelectronics *****END OF FILE****/ |
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发表于 2013-7-28 15:47:33
发表于 2013-7-28 16:23:48
