stm32f407 定时器触发ADC

wocgjjc

ADC1和TIM1的配置如下，ADC为啥启动不了呢， ADC1ConvertedValue 的值一直是0

void _ADC1_CH2_DMA_Config(void)

{

 ADC_InitTypeDef       ADC_InitStructure;

 ADC_CommonInitTypeDef ADC_CommonInitStructure;

 DMA_InitTypeDef       DMA_InitStructure;

 GPIO_InitTypeDef      GPIO_InitStructure;

 /* Enable ADC3, DMA2 and GPIO clocks ****************************************/

 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOA, ENABLE);

 RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

 /* DMA2 Stream0 channel2 configuration **************************************/

 DMA_InitStructure.DMA_Channel = DMA_Channel_0; 

 DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS;

 DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC1ConvertedValue;//(uint32_t)&ADC1ConvertedValue;

 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;

 DMA_InitStructure.DMA_BufferSize = 1;

 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//DMA_MemoryInc_Disable;

 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;

 DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;

 DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;//DMA_Mode_Circular;

 DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;

 DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;        

 DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;

 DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;

 DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;

 DMA_Init(DMA2_Stream0, &DMA_InitStructure);

 DMA_Cmd(DMA2_Stream0, ENABLE);

 /* Configure ADC1 Channel2 pin as analog input ******************************/

 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;

 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;

 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;

 GPIO_Init(GPIOA, &GPIO_InitStructure);

 /* ADC Common Init **********************************************************/

 ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;

 ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;

 ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;

 ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;

 ADC_CommonInit(&ADC_CommonInitStructure);

 /* ADC1 Init ****************************************************************/

 ADC_InitStructure.ADC_Resolution = ADC_Resolution_8b;

 ADC_InitStructure.ADC_ScanConvMode = DISABLE;//ENABLE;

 ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;//ENABLE;

 ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;

 ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;

 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;

 ADC_InitStructure.ADC_NbrOfConversion = 1;

 ADC_Init(ADC1, &ADC_InitStructure);

 /* ADC1 regular channel2 configuration *************************************/

 ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 1, ADC_SampleTime_3Cycles);

 /* Enable DMA request after last transfer (Single-ADC mode) */

  ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);

 /* Enable ADC1 DMA */

 ADC_DMACmd(ADC1, ENABLE);

 /* Enable ADC1 */

 ADC_Cmd(ADC1, ENABLE);

 

 ADC_SoftwareStartConv(ADC1);

}

void TIM_Config(void)

{

 TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

 TIM_OCInitTypeDef  TIM_OCInitStructure;

 RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

 /* Time Base configuration */

 TIM_TimeBaseStructure.TIM_Prescaler = 8-1;

 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

 TIM_TimeBaseStructure.TIM_Period = 30;

 TIM_TimeBaseStructure.TIM_ClockDivision = 0;

 TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;

 TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

 

 /* Channel 1, 2,3 and 4 Configuration in PWM mode */

 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;

 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

 TIM_OCInitStructure.TIM_Pulse = 6;

 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;

 TIM_OC1Init(TIM1, &TIM_OCInitStructure);

 TIM_ARRPreloadConfig(TIM1, ENABLE);

 TIM_OC1PreloadConfig (TIM1, TIM_OCPreload_Enable);

 TIM_CtrlPWMOutputs(TIM1, ENABLE);

 /* TIM1 counter enable */

 TIM_Cmd(TIM1, ENABLE);

}

正点原子

参考下本论坛别人的代码。
搜索下。