使用一个外部触发同步地启动2个定时器的问题

羊烊

直接上代码：

include "TIM_syn5.h"

include "led.h"

TIM_HandleTypeDef TIM_HandleStructure1,TIM_HandleStructure2; TIM_MasterConfigTypeDef TIM_MasterStructure; TIM_SlaveConfigTypeDef TIM_SlaveStructure; TIM_OC_InitTypeDef TIM_OC_InitStructure; TIM_IC_InitTypeDef TIM_IC_InitStructure;

void TIM_syn_Init(void) { //定时器TIM1的配置 TIM_HandleStructure1.Instance = MASTER_TIMx; TIM_HandleStructure1.Init.Prescaler = MASTER_PSC; TIM_HandleStructure1.Init.Period = MASTER_PERIOD; TIM_HandleStructure1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; TIM_HandleStructure1.Init.CounterMode = TIM_COUNTERMODE_UP; HAL_TIM_OC_Init(&TIM_HandleStructure1); //定时器1主模式配置 TIM_MasterStructure.MasterOutputTrigger = TIM_TRGO_ENABLE; TIM_MasterStructure.MasterSlaveMode = TIM_MASTERSLAVEMODE_ENABLE; HAL_TIMEx_MasterConfigSynchronization(&TIM_HandleStructure1,&TIM_MasterStructure); //定时器1从模式配置 TIM_SlaveStructure.InputTrigger = TIM_TS_TI1F_ED; TIM_SlaveStructure.SlaveMode = TIM_SLAVEMODE_TRIGGER; TIM_SlaveStructure.TriggerFilter = 0; TIM_SlaveStructure.TriggerPrescaler = TIM_TRIGGERPRESCALER_DIV1; HAL_TIM_SlaveConfigSynchro(&TIM_HandleStructure1,&TIM_SlaveStructure); //定时器TIM1比较输出配置 TIM_OC_InitStructure.OCMode = TIM_OCMODE_PWM2; TIM_OC_InitStructure.Pulse = (MASTER_PERIOD+1)/2; TIM_OC_InitStructure.OCPolarity = TIM_OCPOLARITY_HIGH; TIM_OC_InitStructure.OCNPolarity = TIM_OCNPOLARITY_HIGH; TIM_OC_InitStructure.OCIdleState = TIM_OCIDLESTATE_SET; TIM_OC_InitStructure.OCNIdleState = TIM_OCNIDLESTATE_RESET; HAL_TIM_OC_ConfigChannel(&TIM_HandleStructure1,&TIM_OC_InitStructure,TIM_CHANNEL_4); //定时器TIM1捕获输入通道配置 TIM_IC_InitStructure.ICPrescaler = TIM_ICPSC_DIV1; TIM_IC_InitStructure.ICFilter = 0; TIM_IC_InitStructure.ICPolarity = TIM_ICPOLARITY_RISING; TIM_IC_InitStructure.ICSelection = TIM_ICSELECTION_DIRECTTI; HAL_TIM_IC_ConfigChannel(&TIM_HandleStructure1,&TIM_IC_InitStructure,TIM_CHANNEL_1); //定时器TIM2的配置 TIM_HandleStructure2.Instance = SLAVE_TIMx; TIM_HandleStructure2.Init.Prescaler = SLAVE_PSC; TIM_HandleStructure2.Init.Period = SLAVE_PERIOD; TIM_HandleStructure2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; TIM_HandleStructure2.Init.CounterMode = TIM_COUNTERMODE_UP; HAL_TIM_OC_Init(&TIM_HandleStructure2); //TIM2从模式配置 TIM_SlaveStructure.InputTrigger = TIM_TS_ITR0; TIM_SlaveStructure.SlaveMode = TIM_SLAVEMODE_TRIGGER; TIM_SlaveStructure.TriggerFilter = 0; TIM_SlaveStructure.TriggerPrescaler = TIM_TRIGGERPRESCALER_DIV1; HAL_TIM_SlaveConfigSynchro(&TIM_HandleStructure2,&TIM_SlaveStructure); //定时器TIM2比较输出配置 TIM_OC_InitStructure.OCMode = TIM_OCMODE_PWM2; TIM_OC_InitStructure.Pulse = (SLAVE_PERIOD+1)/2; TIM_OC_InitStructure.OCPolarity = TIM_OCPOLARITY_HIGH; TIM_OC_InitStructure.OCNPolarity = TIM_OCNPOLARITY_HIGH; TIM_OC_InitStructure.OCIdleState = TIM_OCIDLESTATE_SET; TIM_OC_InitStructure.OCNIdleState = TIM_OCNIDLESTATE_RESET; HAL_TIM_OC_ConfigChannel(&TIM_HandleStructure2,&TIM_OC_InitStructure,TIM_CHANNEL_4); TIM_OC_InitStructure.Pulse = (SLAVE_PERIOD+1)/2; TIM_OC_InitStructure.OCPolarity = TIM_OCPOLARITY_LOW; HAL_TIM_OC_ConfigChannel(&TIM_HandleStructure2,&TIM_OC_InitStructure,TIM_CHANNEL_1); //中断控制器设置 HAL_NVIC_SetPriority(SLAVE_IRQn,1,3); HAL_NVIC_EnableIRQ(SLAVE_IRQn);

//启动TIM1的OC或OCN通道 HAL_TIM_OC_Start(&TIM_HandleStructure1,TIM_CHANNEL_4); //开启定时器1捕获通道1 HAL_TIM_IC_Start(&TIM_HandleStructure1,TIM_CHANNEL_1); //启动TIM2的OC或OCN通道 HAL_TIM_OC_Start(&TIM_HandleStructure2,TIM_CHANNEL_1); HAL_TIM_OC_Start(&TIM_HandleStructure2,TIM_CHANNEL_4); //开启带中断功能的定时器TIM2 HAL_TIM_Base_Start_IT(&TIM_HandleStructure2); }

void HAL_TIM_OC_MspInit(TIM_HandleTypeDef *htim) { if(htim->Instance==MASTER_TIMx) { //开时钟 HAL_RCC_GPIOA_CLK_ENABLE(); //可以不输出！ HAL_RCC_GPIOB_CLK_ENABLE(); MASTER_TIM_CLK_ENABLE(); SLAVE_TIM_CLK_ENABLE();

//GPIO初始化，如果需要输出的话
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.Pin                        = GPIO_PIN_8;
GPIO_InitStructure.Mode                       = GPIO_MODE_AF_INPUT;
GPIO_InitStructure.Pull                       = GPIO_PULLDOWN;
GPIO_InitStructure.Speed                      = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(GPIOA,&GPIO_InitStructure);  

GPIO_InitStructure.Pin                        = GPIO_PIN_11;        //TIM1_CH4
GPIO_InitStructure.Mode                       = GPIO_MODE_AF_PP;
GPIO_InitStructure.Pull                       = GPIO_PULLUP;
HAL_GPIO_Init(GPIOA,&GPIO_InitStructure);

// GPIO_InitStructure.Pin = GPIO_PIN_13; //TIM1_CH1N // HAL_GPIO_Init(GPIOB,&GPIO_InitStructure); } if(htim->Instance==SLAVE_TIMx) { //开时钟 __HAL_RCC_GPIOA_CLK_ENABLE();

//GPIO初始化，如果需要输出的话
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.Pin                        = GPIO_PIN_0;         //TIM2通道1
GPIO_InitStructure.Mode                       = GPIO_MODE_AF_PP;
GPIO_InitStructure.Pull                       = GPIO_PULLUP;
GPIO_InitStructure.Speed                      = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(GPIOA,&GPIO_InitStructure); 

GPIO_InitStructure.Pin                        = GPIO_PIN_3;         //TIM2通道4
HAL_GPIO_Init(GPIOA,&GPIO_InitStructure);

} }

输出的波形如下图所示，其中图中的channel2实际为定时器1第四通道输出的PWM波形；

图中的channel3和channel4为定时器2第1和第2通道输出的PWM波形。

从图可见：上图中的标注2和3为定时器TIM2两个通道的波形是同步的，标注为1的是定时器TIM1通道4输出的PWM波形，显然1与2和3不同步，咋回事呢？

lrz

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