定时器同步
我用TIM2做主模式 TIM1和TIM3做从模式，用TIM2门控方式成功触发同步TIM1和TIM3，但是如果用TIM3做主，TIM2和TIM1做从，则无法实现，按理说通用定时器区别是不大的，为什么会出现这种情况？请大家帮忙看看，下面是代码：#include "stm32f10x.h"
/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
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).
-------------------------------------------------------------------- */
/* 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(TIM3, &TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = 9;
TIM_TimeBaseInit(TIM2, &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(TIM3, &TIM_OCInitStructure);
/* Select the Master Slave Mode */
TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable);
/* Master Mode selection */
TIM_SelectOutputTrigger(TIM3, 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(TIM2, &TIM_OCInitStructure);
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
/* Slave Mode selection: TIM3 */
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Gated);
TIM_SelectInputTrigger(TIM2, TIM_TS_ITR1);
/* Slave Mode selection: TIM4 */
TIM_SelectSlaveMode(TIM1, TIM_SlaveMode_Gated);
TIM_SelectInputTrigger(TIM1, TIM_TS_ITR1);
/* TIM enable counter */
TIM_Cmd(TIM3, 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
页:
[1]