[sinc_func 0]

Здравствуйте,

Сейчас пытаюсь настроить ADC ST32F207 для работы через DMA на заполнение кругового буфера (для последующей DSP обработки).

Периодически запускать ADC должен Timer2 (TR_GO). Но почему-то от представленной ниже инициализации

процессор так и не входит в прерывание от DMA

 

Инициализация ADC+DMA

void ADC123_DMA_Config(void) {
 ADC_InitTypeDef       ADC_InitStructure;
 ADC_CommonInitTypeDef ADC_CommonInitStructure;
 DMA_InitTypeDef       DMA_InitStructure;
 GPIO_InitTypeDef      GPIO_InitStructure;
NVIC_InitTypeDef			NVIC_InitStructure;

 // Enable ADC1, DMA2 and GPIO clocks 
 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
 RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

 // DMA2 Stream0 channel0 configuration 
 DMA_InitStructure.DMA_Channel = DMA_Channel_0;  
 DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)  & (ADC1->DR);

 DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t) ADCBuffer; 
 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
 DMA_InitStructure.DMA_BufferSize = ADC_B;		
 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;		
 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
 DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
 DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
 DMA_InitStructure.DMA_Priority = DMA_Priority_Low;
 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_ITConfig(DMA2_Stream0, DMA_IT_TC | DMA_IT_HT, ENABLE);
 DMA_Cmd(DMA2_Stream0, ENABLE);

 // Enable the DMA2_Stream0 Interrupt 
 NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream0_IRQn;
 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
 NVIC_Init(&NVIC_InitStructure);


 // Configure ADC1 Channel1 pin as analog input - PA1
 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
 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_Div8;										// --  2us
 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_12b;
 ADC_InitStructure.ADC_ScanConvMode = DISABLE;
 ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
 ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
 ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO;
 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Left;
 ADC_InitStructure.ADC_NbrOfConversion = 1;
 ADC_Init(ADC1, &ADC_InitStructure);


 // ADC1 regular channel0 configuration 
 ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 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);

}

 

Инициализация Timer2

void TIM2_Config(void)
{
	// Output  125 kHz -> for ADC1 sampling
	// Output signal -> TRGO
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
//	TIM_OCInitTypeDef  TIM_OCInitStructure;

 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

 TIM_TimeBaseStructure.TIM_Period = 479;
 TIM_TimeBaseStructure.TIM_Prescaler = 0;		// every clock
 TIM_TimeBaseStructure.TIM_ClockDivision = 0;
 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
 TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
 TIM_ARRPreloadConfig(TIM2, ENABLE);

 TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);

 TIM_Cmd(TIM2, ENABLE); 
}

 

И я надеюсь от этого кода побывать отладчиком в прерывании

 

//------------------------------------------------------------------------------
void DMA2_Stream0_IRQHandler(void)			// ADC -> DMA
{
if (DMA2->LISR & DMA_LISR_HTIF0 )		{		// half transfer
	ADCp = &ADCBuffer[0];
	LED_On (1);
}
else 		{																// full transfer
	ADCp = &ADCBuffer[ADC_B>>1];
	LED_Off (1);
}


ADCf=1;
DMA1->LIFCR =   DMA_LIFCR_CHTIF0 | DMA_LIFCR_CTCIF0;										// reset general irq flags
}

 

Буду признателен на подсказку решения