DMA geht nur einmal! STM32

[Ingo (Gast)]

Ich habe folgende Problem. Der DMA Funktioniert nur einmal, dann bleibt 
er auf 9999 stehen bzw. 10000. Ich finde den Fehler einfach nicht!

Der Timer der den ADC-Triggert läuft weiterhin, aber geht halt nur 
einmal. Im Circular-Mode gibts keine Probleme, also irgendwas übersehe 
ich noch bei Neustarten des DMA! Woran liegts?

Ingo

STM32F405, CooCox.

while(1){

      if (Flags.RS232DebugOut){
        Flags.RS232DebugOut = OFF;
        Set_DataCounter(10000);
        uint32_t Temp = 0;
        Temp = DMA_GetCurrDataCounter(DMA2_Stream0);
        printf("\n%u", (unsigned int)Temp);
        MyDelayMS(10);
        Temp = DMA_GetCurrDataCounter(DMA2_Stream0);
        printf("\n%u", (unsigned int)Temp);
      }

    }


void Init_ADC ( void )
{
  /* Takt für Peripherie setzen */
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 , ENABLE);
    RCC_APB2PeriphClockCmd( RCC_APB2Periph_ADC1, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_StructInit(&GPIO_InitStructure);
    ADC_InitTypeDef ADC_InitStructure;
    ADC_StructInit(&ADC_InitStructure);
    ADC_CommonInitTypeDef ADC_CommonInitStructure;
    ADC_CommonStructInit(&ADC_CommonInitStructure);
    DMA_InitTypeDef DMA_InitStructure;
    DMA_StructInit(&DMA_InitStructure);
    TIM_TimeBaseInitTypeDef TIM_TimeBase_InitStructure;
    TIM_TimeBaseStructInit (&TIM_TimeBase_InitStructure);
//    NVIC_InitTypeDef NVIC_InitStructure;

    TIM_TimeBase_InitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBase_InitStructure.TIM_CounterMode = TIM_CounterMode_Up;


    TIM_TimeBase_InitStructure.TIM_Period = 840;
    TIM_TimeBase_InitStructure.TIM_Prescaler = 0;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBase_InitStructure);

    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
    TIM_SelectOutputTrigger(TIM2,TIM_TRGOSource_Update);
    TIM_ARRPreloadConfig(TIM2, ENABLE);

//    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
//    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
//    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
//    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
//    NVIC_Init(&NVIC_InitStructure);
    //TIM_Cmd(TIM2, ENABLE);


    /////////////////////////////////////////////////////////////////
    // GPIOC
    /////////////////////////////////////////////////////////////////


    /* ADC Kanäle */
    /* IO initialisieren */
    GPIO_StructInit(&GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    GPIO_StructInit(&GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    /* DMA Controll */
    DMA_InitStructure.DMA_Channel = DMA_Channel_0;
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(ADC1->DR);
    DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)DataBuffer;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
    DMA_InitStructure.DMA_BufferSize = BUFFERSIZE;
    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_Mode = DMA_Mode_Normal;
    DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    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);

    /* ADC */
    ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div8;
    ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
    ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
    ADC_CommonInit(&ADC_CommonInitStructure);

    ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
    ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfConversion = 1;
    ADC_Init(ADC1, &ADC_InitStructure);

    ADC_EOCOnEachRegularChannelCmd(ADC1, ENABLE);
    ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 1, ADC_SampleTime_3Cycles);

    DMA_Cmd(DMA2_Stream0, ENABLE);
    ADC_Cmd(ADC1, ENABLE);
    ADC_DMACmd(ADC1, ENABLE);
    ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
    TIM_Cmd(TIM2, ENABLE);
}

void Set_DataCounter ( uint16_t Value )
{
  DMA_ClearITPendingBit(DMA2_Stream0,DMA_IT_TCIF0);
  DMA_ClearITPendingBit(DMA2_Stream0,DMA_IT_HTIF0);
  DMA_ClearITPendingBit(DMA2_Stream0,DMA_IT_TEIF0);
  DMA_ClearITPendingBit(DMA2_Stream0,DMA_IT_DMEIF0);
  DMA_ClearITPendingBit(DMA2_Stream0,DMA_IT_FEIF0);
  // Disable DMA Stream
        DMA_Cmd(DMA2_Stream0, DISABLE);

  // Clear Interrupt Flag
  DMA_ClearFlag(DMA2_Stream0, DMA_FLAG_TCIF0);
  DMA_ClearFlag(DMA2_Stream0, DMA_FLAG_HTIF0);
  DMA_ClearFlag(DMA2_Stream0, DMA_FLAG_TEIF0);
  DMA_ClearFlag(DMA2_Stream0, DMA_FLAG_DMEIF0);
  DMA_ClearFlag(DMA2_Stream0, DMA_FLAG_FEIF0);

  // Set new Countervalue
  DMA_SetCurrDataCounter(DMA2_Stream0,Value);
  // Enable DMA Stream
  DMA_Cmd(DMA2_Stream0, ENABLE);
}

[Ingo (Gast)]

Push

[Markus M. (Firma: EleLa - www.elela.de) (mmvisual)]

InitStructure.DMA_Mode = DMA_Mode_Circular;

[Ingo (Gast)]

Genau das will ich ja nicht, ich möchte per Befehl n Messungen machen 
und danach erst wieder n Messungen wenn ich es sage!

[Ingo (Gast)]

Wobei der ADC zwar ständig durch den Timer getriggert werden, aber die 
Messwerte nur gespeichert werden sollen wenn der DMA läuft.

Sonst müsste ich die Trigger-Events mitzählen, was mir aber blöde 
erscheint angesichts dessen, das die Hardware das komplett ohne CPU 
Belastung kann!

[Markus M. (Firma: EleLa - www.elela.de) (mmvisual)]

AD Wandler Aktivieren und mit dem DMA Interrupt den AD-Wandler 
deaktivieren.
Dann sind auch alle Wandlungen da und man kann die Daten weiter 
verarbeiten.
Mit DMA_Mode_Circular.

[Ingo (Gast)]

Auf was triggert der DMA-Interrupt dann?

[Markus M. (Firma: EleLa - www.elela.de) (mmvisual)]

Auf den Wert:
DMA_InitStructure.DMA_BufferSize = BUFFERSIZE;

[Ingo (Gast)]

Aber warum meine Code nicht geht würde mich auch interessieren! Hast du 
ne Idee?

[Ingo (Gast)]

Tja, sehr merkwürdig das es im "Normal-Mode" nur einmal funktioniert und 
die Tricks im Internet mit Interrupt-Flags löschen nicht helfen...

Hab jetzt tatsächlich einen Interrupt wenn er seine n Messungen fertig 
hat. Funktioniert auch sauber. Besten dank!

[Markus M. (Firma: EleLa - www.elela.de) (mmvisual)]

Bitteschön.