ST意法半导体中文论坛STM32F103关于TIM1触发ADC采样的频率设置异常

STM32F103关于TIM1触发ADC采样的频率设置异常

finalapple 提问时间：2014-9-5 10:09 /

问答
是否解决:

打扰下，有一个奇葩的问题很困扰。STM32F103的，定时器触发ADC中断再通过DMA传送数据。在定时0.01秒或者更慢的时候可以触发，定时0.001秒或者更快就无法触发。我采样周期设的1.5个周期。这是为啥？为啥定时器设快了就不能触发了？
心急QAQ
下附源代码：
void ADC_DMA(void)
{

ADC_InitTypeDef ADC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
//====================================
RCC_ADCCLKConfig(RCC_CFGR_ADCPRE_DIV6);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_ADC2|RCC_APB2Periph_ADC1,ENABLE);

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1|RCC_AHBPeriph_DMA2,ENABLE);

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AIN;
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0|GPIO_Pin_1;
GPIO_Init(GPIOA,&GPIO_InitStructure);
//Timer1
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = 1000; //通过这两个设置采样频率，但为什么在低于等于500Hz的时候可以触发ADC，高于500Hz的时候不能触发。。。
TIM_TimeBaseStructure.TIM_Prescaler = (144 - 1);
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
/* TIM1 channel1 configuration in PWM mode */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0x7f;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);

   NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_ClearFlag(TIM1, TIM_FLAG_Update);
TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE);

/* DMA1Í¨µÀ1ÅäÖÃ*/
DMA_DeInit(DMA1_Channel1);       //¿ªÆôDMA1µÄµÚÒ»Í¨µÀ
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;       //DMA¶ÔÓ¦µÄÍâÉè»ùµØÖ·
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADCConvertedValue; //ÄÚ´æ´æ´¢»ùµØÖ·
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //DMAµÄ×ª»»Ä£Ê½ÎªSRCÄ£Ê½£¬ÓÉÍâÉè°áÒÆµ½ÄÚ´æ
DMA_InitStructure.DMA_BufferSize = 2*fuck;      //DMA»º´æ´óÐ¡£¬1000¸ö
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //½ÓÊÕÒ»´ÎÊý¾Ýºó£¬Éè±¸µØÖ·½ûÖ¹ºóÒÆ
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //¹Ø±Õ½ÓÊÕÒ»´ÎÊý¾Ýºó£¬Ä¿±êÄÚ´æµØÖ·ºóÒÆ
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;//¶¨ÒåÍâÉèÊý¾Ý¿í¶ÈÎª16Î»
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;    //DMA°áÒÆÊý¾Ý³ß´ç£¬HalfWord¾ÍÊÇÎª16Î»
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //×ª»»Ä£Ê½£¬Ñ»·»º´æÄ£Ê½¡£
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //DMAÓÅÏÈ¼¶¸ß
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;       //M2MÄ£Ê½½ûÓÃ
DMA_Init(DMA1_Channel1, &DMA_InitStructure);

/* Ê¹ÄÜDMA1Í¨µÀ1 */
DMA_Cmd(DMA1_Channel1, ENABLE);

/* ADC1ÅäÖÃ*/
ADC_InitStructure.ADC_Mode = ADC_Mode_RegSimult; //¶ÀÁ¢µÄ×ª»»Ä£Ê½
ADC_InitStructure.ADC_ScanConvMode = ENABLE;       //¿ªÆôÉ¨ÃèÄ£Ê½
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //¿ªÆôÁ¬Ðø×ª»»Ä£Ê½
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1; //ADCÍâ²¿¿ª¹Ø£¬¹Ø±Õ×´Ì¬
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //¶ÔÆë·½Ê½,ADCÎª12Î»ÖÐ£¬ÓÒ¶ÔÆë·½Ê½
ADC_InitStructure.ADC_NbrOfChannel = 1;      //¿ªÆôÍ¨µÀÊý£¬1¸ö
ADC_Init(ADC1, &ADC_InitStructure);
/* ADC2ÅäÖÃ*/
ADC_InitStructure.ADC_Mode = ADC_Mode_RegSimult; //¶ÀÁ¢µÄ×ª»»Ä£Ê½
ADC_InitStructure.ADC_ScanConvMode = ENABLE;       //¿ªÆôÉ¨ÃèÄ£Ê½
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //¿ªÆôÁ¬Ðø×ª»»Ä£Ê½
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1; //ADCÍâ²¿¿ª¹Ø£¬¹Ø±Õ×´Ì¬
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //¶ÔÆë·½Ê½,ADCÎª12Î»ÖÐ£¬ÓÒ¶ÔÆë·½Ê½
ADC_InitStructure.ADC_NbrOfChannel = 1;      //¿ªÆôÍ¨µÀÊý£¬1¸ö
ADC_Init(ADC2, &ADC_InitStructure);
ADC_ExternalTrigConvCmd(ADC2, ENABLE);
/* ADC1Í¨µÀ14ÅäÖÃ*/
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_1Cycles5);
ADC_RegularChannelConfig(ADC2, ADC_Channel_1, 1, ADC_SampleTime_1Cycles5);

ADC_DMACmd(ADC1, ENABLE);

ADC_Cmd(ADC1, ENABLE);
ADC_Cmd(ADC2, ENABLE);

ADC_ResetCalibration(ADC1);
ADC_ResetCalibration(ADC2);

while(ADC_GetResetCalibrationStatus(ADC1));
while(ADC_GetResetCalibrationStatus(ADC2));

/* ¿ªÊ¼Ð£×¼ADC1 */
ADC_StartCalibration(ADC1);
ADC_StartCalibration(ADC2);

while(ADC_GetCalibrationStatus(ADC1));
while(ADC_GetCalibrationStatus(ADC2));
// ADC_SoftwareStartConvCmd(ADC1, ENABLE);
// ADC_SoftwareStartConvCmd(ADC2, ENABLE);

ADC_ExternalTrigConvCmd(ADC1, ENABLE);
// ADC_ITConfig(ADC1,ADC_IT_EOC,ENABLE);
TIM_Cmd(TIM1, ENABLE);
TIM_CtrlPWMOutputs(TIM1,ENABLE);
}
在线急求。急的我心疼QAQ