TIM2触发ADC采样问题？求助大家

Hans.he 提问时间：2019-7-2 11:11 /

各位大神好：
本人使用STM32F103C6T6，期望目标是：TIM2采用中心对齐模式3，同时ADC_ExternalTrigConv_T2_CC2触发ADC采样？按照手册说明：在中心对齐模式3中增加和减少的过程中都会产生比较事件，比较事件可以触发ADC，这样按照手册说明应该是触发两次采样，但是我测试情况发现无论如何都只触发一次采样？而且都是在增加过程中的比较点处触发？是哪里有问题？
已经明确的问题：1、不是两次采样中间时间不够，已经确保两次采样之间的时间足够完成，确保了两次之间的时间够长。2、确保了TIM2是中心对齐模式，3、确保了ADC能够触发采样，只是在一个周期内没有触发两次，在此恳请各位帮忙解答一下，谢谢，
如下式我的程序还请各位有空帮忙查看：
//ADC
void ADC_Config(void)
{
GPIO_InitTypeDef  GPIO_InitStruct;
ADC_InitTypeDef ADC_InitStruct;
DMA_InitTypeDef DMA_InitStruct;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA, &GPIO_InitStruct);

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);
DMA_DeInit(DMA1_Channel1);
DMA_InitStruct.DMA_PeripheralBaseAddr = ( Uint32 ) ( & ( ADC1->DR ));
DMA_InitStruct.DMA_MemoryBaseAddr = (Uint32)ADC_ConvResult;
DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStruct.DMA_BufferSize = ADC_SAMPLE_NUM;
DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStruct.DMA_Mode = DMA_Mode_Circular;
DMA_InitStruct.DMA_Priority = DMA_Priority_High;
DMA_InitStruct.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStruct);
DMA_ITConfig(DMA1_Channel1,DMA_IT_TC,ENABLE);
DMA_Cmd(DMA1_Channel1 , ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);
ADC_InitStruct.ADC_Mode = ADC_Mode_Independent;
ADC_InitStruct.ADC_ScanConvMode = ENABLE;
ADC_InitStruct.ADC_ContinuousConvMode = DISABLE;
ADC_InitStruct.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_CC2;
ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStruct.ADC_NbrOfChannel = ADC_SAMPLE_NUM;
ADC_Init(ADC1, &ADC_InitStruct);
RCC_ADCCLKConfig(RCC_PCLK2_Div6);
ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 1, ADC_SampleTime_1Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 2, ADC_SampleTime_1Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 3, ADC_SampleTime_1Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 4, ADC_SampleTime_1Cycles5);
ADC_DMACmd(ADC1, ENABLE);
//ADC_ITConfig(ADC1,ADC_IT_EOC, ENABLE);
ADC_Cmd(ADC1,ENABLE);

ADC_ResetCalibration(ADC1);

while(ADC_GetResetCalibrationStatus(ADC1))
{
;
}

ADC_StartCalibration(ADC1);

while(ADC_GetCalibrationStatus(ADC1))
{
;
}

ADC_ExternalTrigConvCmd(ADC1,ENABLE);

NVIC_InitTypeDef NVIC_InitTyStuct;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitTyStuct.NVIC_IRQChannel = DMA1_Channel1_IRQn;
NVIC_InitTyStuct.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitTyStuct.NVIC_IRQChannelSubPriority = 1;
NVIC_InitTyStuct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitTyStuct);

}

void TIM2_Config(void)
{
TIM_TimeBaseInitTypeDef    TIM_TimeBaseStructure;
TIM_OCInitTypeDef    TIM_OCInitStructure;

/* TIM2 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 , ENABLE);

/* GPIOA, GPIOB and GPIOE Clocks enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
#if 1
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
#endif
/* Time Base configuration */
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period = EPWM_TIMER_TBPRD - 1;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

/* Channel 1, 2,3 and 4 Configuration in PWM mode */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = EPWM_TIMER_TBPRD - 600;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OC2Init(TIM2, &TIM_OCInitStructure);

TIM_OC2PreloadConfig(TIM2, DISABLE);
/* TIM2 Main Output Enable */
TIM_CtrlPWMOutputs(TIM2, ENABLE);
#if 0
TIM_SelectOutputTrigger(TIM1, TIM_TRGOSource_Enable);
TIM_SelectInputTrigger(TIM2, TIM_TS_ITR0);
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Gated);
TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable);
#endif

TIM_Cmd(TIM2, ENABLE);

//TIM_Cmd(TIM1, ENABLE);
}

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5个回答

Hans.he 回答时间：2019-7-2 11:20:01

不好意思？上面的TIM2配置程序，是我为了解决问题而改的一种，采样边沿对齐模式，这样就就可以出发采样两次，但是在中心对齐模式3下面的确是只出发一次。
程序如下：
void TIM2_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;

/* TIM2 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 , ENABLE);

/* GPIOA, GPIOB and GPIOE Clocks enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
#if 1
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
#endif
/* Time Base configuration */
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned3;
TIM_TimeBaseStructure.TIM_Period = EPWM_TIMER_TBPRD;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

/* Channel 1, 2,3 and 4 Configuration in PWM mode */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = EPWM_TIMER_TBPRD - 600;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OC2Init(TIM2, &TIM_OCInitStructure);

TIM_OC2PreloadConfig(TIM2, DISABLE);
/* TIM2 Main Output Enable */
TIM_CtrlPWMOutputs(TIM2, ENABLE);
#if 1
TIM_SelectOutputTrigger(TIM1, TIM_TRGOSource_Enable);
TIM_SelectInputTrigger(TIM2, TIM_TS_ITR0);
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Gated);
TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable);
#endif

TIM_Cmd(TIM2, ENABLE);

TIM_Cmd(TIM1, ENABLE);
}

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