Forum: Mikrocontroller und Digitale Elektronik [STM32F4] ADC Triggert DMA->GPIO nicht


[STM32F4] ADC Triggert DMA->GPIO nicht
von stfanboy (Gast)

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Hallo,

ich versuche gerade einen ADC auf dem STM32F4 Discovery zu debuggen.
Der ADC wird von einem Timer gestartet und nachdem die Konvertierung 
fertig ist werden die Daten von einem DMA abgeholt und im RAM abgelegt. 
Das scheint so weit zu funktionieren, in meinem RAM laden 8Bit Werte vom 
ADC der auf 8Bit eingestellt ist. Nur die Synchronisierung mit anderen 
Timer/GPIO Signalen scheint aber noch nicht zu funktionieren also wollte 
ich statt das ADC_DR-Register auszulesen einen GPIO (PC5) toggeln 
lassen(was auch schon funktioniert hat), allerdings bewegt sich an PC5 
nichts.

Hier mal der Code mit ADC1_DR --> RAM
1
    // Timer8 init

2
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);    //Clock enable

3
    st_Timer8Config.TIM_ClockDivision = TIM_CKD_DIV1;       //Timer1 as Master --> 500ns

4
    st_Timer8Config.TIM_Prescaler = 0u;                     //-> 500ns

5
    st_Timer8Config.TIM_Period =  1u;                       //-> 1us

6
    st_Timer8Config.TIM_CounterMode = TIM_CounterMode_Up;

7
    TIM_TimeBaseInit(TIM8, &st_Timer8Config);

8
    TIM_ARRPreloadConfig(TIM8, ENABLE);   

9
    //Timer8 is Slave of Timer1:

10
    TIM_SelectInputTrigger(TIM8, TIM_TS_ITR0);

11
    TIM_SelectSlaveMode(TIM8, TIM_SlaveMode_External1);

12
    //ADC1 init

13
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);   //input pin = PC1

14
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

15
    st_GpioAdc.GPIO_Pin = GPIO_Pin_1;

16
    st_GpioAdc.GPIO_Mode = GPIO_Mode_AN;

17
    st_GpioAdc.GPIO_PuPd = GPIO_PuPd_NOPULL ;

18
    GPIO_Init(GPIOC, &st_GpioAdc);  

19
    st_AdcInit1.ADC_Mode = ADC_Mode_Independent;

20
    st_AdcInit1.ADC_Prescaler = ADC_Prescaler_Div2;

21
    st_AdcInit1.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;

22
    st_AdcInit1.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;    //nur fue continuos mode interessant?

23
    ADC_CommonInit(&st_AdcInit1);

24
    st_AdcInit2.ADC_Resolution = ADC_Resolution_8b;

25
    st_AdcInit2.ADC_ScanConvMode = DISABLE; // 1 Channel

26
    st_AdcInit2.ADC_ContinuousConvMode = ENABLE; // Conversions Triggered

27
    st_AdcInit2.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;

28
    st_AdcInit2.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T8_TRGO;    //Timer 8 starts conversion

29
    st_AdcInit2.ADC_DataAlign = ADC_DataAlign_Right;

30
    st_AdcInit2.ADC_NbrOfConversion = 1;

31
    ADC_Init(ADC1, &st_AdcInit2);

32
    ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 1, ADC_SampleTime_15Cycles); // PC1

33
    //ADC_Cmd(ADC1, ENABLE);

34
    //DMA Init       

35
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);

36
    st_DMA_ADCtoRAM.DMA_Channel = DMA_Channel_0;

37
    

38
    st_DMA_ADCtoRAM.DMA_PeripheralBaseAddr = (uint32_t)ADC1_BASE + 0x4C;  //0x4C = Dataregister Offset

39
    st_DMA_ADCtoRAM.DMA_Memory0BaseAddr = (uint32_t)au32_ADCresult_Buffer1;

40
    st_DMA_ADCtoRAM.DMA_DIR = DMA_DIR_PeripheralToMemory;

41
    st_DMA_ADCtoRAM.DMA_BufferSize = 24;

42
    

43
    /*

44
    st_DMA_ADCtoRAM.DMA_PeripheralBaseAddr = (uint32_t)GPIOC_BASE + 0x18; // 0x18 = BSRR-Register Offset    

45
    st_DMA_ADCtoRAM.DMA_Memory0BaseAddr =    (uint32_t)au32_TestOut;

46
    st_DMA_ADCtoRAM.DMA_DIR = DMA_DIR_MemoryToPeripheral;

47
    st_DMA_ADCtoRAM.DMA_BufferSize = 2;

48
    */

49
    st_DMA_ADCtoRAM.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

50
    st_DMA_ADCtoRAM.DMA_MemoryInc = DMA_MemoryInc_Enable;

51
    st_DMA_ADCtoRAM.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;

52
    st_DMA_ADCtoRAM.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;

53
    st_DMA_ADCtoRAM.DMA_Mode = DMA_Mode_Circular;

54
    st_DMA_ADCtoRAM.DMA_Priority = DMA_Priority_Low;

55
    st_DMA_ADCtoRAM.DMA_FIFOMode = DMA_FIFOMode_Disable;

56
    st_DMA_ADCtoRAM.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;

57
    st_DMA_ADCtoRAM.DMA_MemoryBurst = DMA_MemoryBurst_Single;

58
    st_DMA_ADCtoRAM.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;

59
    DMA_Init(DMA2_Stream0, &st_DMA_ADCtoRAM);

60
    

61
    DMA_Cmd(DMA2_Stream0, ENABLE);    

62
    ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);

63
    ADC_DMACmd(ADC1, ENABLE);

64
    ADC_Cmd(ADC1, ENABLE);

65
    ADC_SoftwareStartConv(ADC1);

66
    TIM_Cmd(TIM8, ENABLE);


Und hier der Code abgeändert auf GPIO toggeln:
1
    au32_TestOut[0] = TESTHIGH;

2
    au32_TestOut[1] = TESTLOW;

3
    // Timer8 init

4
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);    //Clock enable

5
    st_Timer8Config.TIM_ClockDivision = TIM_CKD_DIV1;       //Timer1 as Master --> 500ns

6
    st_Timer8Config.TIM_Prescaler = 0u;                     //-> 500ns

7
    st_Timer8Config.TIM_Period =  1u;                       //-> 1us

8
    st_Timer8Config.TIM_CounterMode = TIM_CounterMode_Up;

9
    TIM_TimeBaseInit(TIM8, &st_Timer8Config);

10
    TIM_ARRPreloadConfig(TIM8, ENABLE);   

11
    //Timer8 is Slave of Timer1:

12
    TIM_SelectInputTrigger(TIM8, TIM_TS_ITR0);

13
    TIM_SelectSlaveMode(TIM8, TIM_SlaveMode_External1);

14
    //ADC1 init

15
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);   //input pin = PC1

16
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

17
    st_GpioAdc.GPIO_Pin = GPIO_Pin_1;

18
    st_GpioAdc.GPIO_Mode = GPIO_Mode_AN;

19
    st_GpioAdc.GPIO_PuPd = GPIO_PuPd_NOPULL ;

20
    GPIO_Init(GPIOC, &st_GpioAdc);  

21
    st_AdcInit1.ADC_Mode = ADC_Mode_Independent;

22
    st_AdcInit1.ADC_Prescaler = ADC_Prescaler_Div2;

23
    st_AdcInit1.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;

24
    st_AdcInit1.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;    //nur fue continuos mode interessant?

25
    ADC_CommonInit(&st_AdcInit1);

26
    st_AdcInit2.ADC_Resolution = ADC_Resolution_8b;

27
    st_AdcInit2.ADC_ScanConvMode = DISABLE; // 1 Channel

28
    st_AdcInit2.ADC_ContinuousConvMode = ENABLE; // Conversions Triggered

29
    st_AdcInit2.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;

30
    st_AdcInit2.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T8_TRGO;    //Timer 8 starts conversion

31
    st_AdcInit2.ADC_DataAlign = ADC_DataAlign_Right;

32
    st_AdcInit2.ADC_NbrOfConversion = 1;

33
    ADC_Init(ADC1, &st_AdcInit2);

34
    ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 1, ADC_SampleTime_15Cycles); // PC1

35
    //ADC_Cmd(ADC1, ENABLE);

36
    //DMA Init       

37
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);

38
    st_DMA_ADCtoRAM.DMA_Channel = DMA_Channel_0;

39
    /*

40
    st_DMA_ADCtoRAM.DMA_PeripheralBaseAddr = (uint32_t)ADC1_BASE + 0x4C;  //0x4C = Dataregister Offset

41
    st_DMA_ADCtoRAM.DMA_Memory0BaseAddr = (uint32_t)au32_ADCresult_Buffer1;

42
    st_DMA_ADCtoRAM.DMA_DIR = DMA_DIR_PeripheralToMemory;

43
    st_DMA_ADCtoRAM.DMA_BufferSize = 24;

44
    */

45
    

46
    st_DMA_ADCtoRAM.DMA_PeripheralBaseAddr = (uint32_t)GPIOC_BASE + 0x18; // 0x18 = BSRR-Register Offset

47
    st_DMA_ADCtoRAM.DMA_Memory0BaseAddr =    (uint32_t)au32_TestOut;

48
    st_DMA_ADCtoRAM.DMA_DIR = DMA_DIR_MemoryToPeripheral;

49
    st_DMA_ADCtoRAM.DMA_BufferSize = 2;

50
    

51
    st_DMA_ADCtoRAM.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

52
    st_DMA_ADCtoRAM.DMA_MemoryInc = DMA_MemoryInc_Enable;

53
    st_DMA_ADCtoRAM.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;

54
    st_DMA_ADCtoRAM.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;

55
    st_DMA_ADCtoRAM.DMA_Mode = DMA_Mode_Circular;

56
    st_DMA_ADCtoRAM.DMA_Priority = DMA_Priority_Low;

57
    st_DMA_ADCtoRAM.DMA_FIFOMode = DMA_FIFOMode_Disable;

58
    st_DMA_ADCtoRAM.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;

59
    st_DMA_ADCtoRAM.DMA_MemoryBurst = DMA_MemoryBurst_Single;

60
    st_DMA_ADCtoRAM.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;

61
    DMA_Init(DMA2_Stream0, &st_DMA_ADCtoRAM);

62
    

63
    DMA_Cmd(DMA2_Stream0, ENABLE);    

64
    ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);

65
    ADC_DMACmd(ADC1, ENABLE);

66
    ADC_Cmd(ADC1, ENABLE);

67
    ADC_SoftwareStartConv(ADC1);

68
    TIM_Cmd(TIM8, ENABLE);


Hat jemand eine Idee was schief geht?

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