STM32F103关于TIM1触发ADC采样的频率设置异常
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);
/* DMA1ͨµÀ1ÅäÖÃ*/
DMA_DeInit(DMA1_Channel1); //¿ªÆôDMA1µÄµÚһͨµÀ
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; //DMAµÄת»»Ä£Ê½ÎªSRCģʽ£¬ÓÉÍâÉè°áÒƵ½ÄÚ´æ
DMA_InitStructure.DMA_BufferSize = 2*fuck; //DMA»º´æ´óС£¬1000¸ö
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //½ÓÊÕÒ»´ÎÊý¾Ýºó£¬É豸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¶ÈΪ16λ
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word; //DMA°áÒÆÊý¾Ý³ß´ç£¬HalfWord¾ÍÊÇΪ16λ
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //ת»»Ä£Ê½£¬Ñ»·»º´æģʽ¡£
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //DMAÓÅÏȼ¶¸ß
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //M2Mģʽ½ûÓÃ
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
/* ʹÄÜDMA1ͨµÀ1 */
DMA_Cmd(DMA1_Channel1, ENABLE);
/* ADC1ÅäÖÃ*/
ADC_InitStructure.ADC_Mode = ADC_Mode_RegSimult; //¶ÀÁ¢µÄת»»Ä£Ê½
ADC_InitStructure.ADC_ScanConvMode = ENABLE; //¿ªÆôɨÃèģʽ
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //¿ªÆôÁ¬Ðøת»»Ä£Ê½
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1; //ADCÍⲿ¿ª¹Ø£¬¹Ø±Õ״̬
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //¶ÔÆ뷽ʽ,ADCΪ12λÖУ¬ÓÒ¶ÔÆ뷽ʽ
ADC_InitStructure.ADC_NbrOfChannel = 1; //¿ªÆôͨµÀÊý£¬1¸ö
ADC_Init(ADC1, &ADC_InitStructure);
/* ADC2ÅäÖÃ*/
ADC_InitStructure.ADC_Mode = ADC_Mode_RegSimult; //¶ÀÁ¢µÄת»»Ä£Ê½
ADC_InitStructure.ADC_ScanConvMode = ENABLE; //¿ªÆôɨÃèģʽ
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //¿ªÆôÁ¬Ðøת»»Ä£Ê½
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1; //ADCÍⲿ¿ª¹Ø£¬¹Ø±Õ״̬
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //¶ÔÆ뷽ʽ,ADCΪ12λÖУ¬ÓÒ¶ÔÆ뷽ʽ
ADC_InitStructure.ADC_NbrOfChannel = 1; //¿ªÆôͨµÀÊý£¬1¸ö
ADC_Init(ADC2, &ADC_InitStructure);
ADC_ExternalTrigConvCmd(ADC2, ENABLE);
/* ADC1ͨµÀ14ÅäÖÃ*/
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
RE:STM32F103关于TIM1触发ADC采样的频率设置异常
你得考虑当前采集AD需要的时间，可以在这种情况下仿真，进入定时器以后，DMA的大小等各方面参数来做对比。
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