Gast
#5017940
Hallo,
ich versuche mit einem STM32F103 einen 4 Kanaligen AD-Wandler in betrieb
zu nehmen. Dazu soll der DMA genutz werden. Allerdings habe ich nun das
Problem, das nur in ADC_values[0] ein sinnvoller Wert. Sieht hier
irgendjemand wo das Problem liegen könnte?
#define UEW_24V GPIO_Pin_0
#define UEW_24V_Channel ADC_Channel_0
#define UEW_7V5 GPIO_Pin_1 ///<PA1
ADC12_IN1
#define UEW_7V5_Channel ADC_Channel_1
#define UEW_5V GPIO_Pin_2 ///<PA2
ADC12_IN2
#define UEW_5V_Channel ADC_Channel_2
#define UEW_3V3 GPIO_Pin_3 ///<PA3
ADC12_IN3
#define UEW_3V3_Channel ADC_Channel_3
#define UEW_GPIO_PORT GPIOA ///<
Verwendeter Port mit AD-Wandler
/**
* @brief Auswahl moeglicher AD-wandler Kanaele
*/
typedef enum {
AN_UEW_24V, ///< AD-Wert 24V
AN_UEW_7V5, ///< AD-Wert 7,5V
AN_UEW_5V, ///< AD-Wert 5V
AN_UEW_3V3, ///< AD-Wert 3,3V
MAX_ANALOG ///< Anzahl Analoger Eingaenge
} analog_t;
volatile uint16_t ADC_values[MAX_ANALOG]; ///< Array mit Werten
des AD-Wandlers
/***********************************************************************
************ Beginn der Initialisierung
*************************************/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ANALOG, ENABLE);
RCC_ADCCLKConfig(RCC_PCLK2_Div6);
// GPIO Pins für ADC konfigurieren
GPIO_InitStructure.GPIO_Pin = UEW_24V | UEW_3V3 | UEW_5V | AN_UEW_7V5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; // Analog Mode
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(UEW_GPIO_PORT, &GPIO_InitStructure);
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = ENABLE; // ENABLE =
Multiple Channels
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = MAX_ANALOG;
ADC_Init(ADC1, &ADC_InitStructure);
// ADC1 regular channel12 configuration
ADC_RegularChannelConfig(ADC1, UEW_24V_Channel, 1,
ADC_SampleTime_41Cycles5);
ADC_RegularChannelConfig(ADC1, UEW_7V5_Channel, 2,
ADC_SampleTime_41Cycles5);
ADC_RegularChannelConfig(ADC1, UEW_5V_Channel, 3,
ADC_SampleTime_41Cycles5);
ADC_RegularChannelConfig(ADC1, UEW_3V3_Channel, 4,
ADC_SampleTime_41Cycles5);
// Enable ADC1 reset calibration register
ADC_ResetCalibration(ADC1);
ADC_StartCalibration(ADC1);
// Enable ADC1
ADC_Cmd(ADC1, ENABLE);
// Enable ADC1 DMA
ADC_DMACmd(ADC1, ENABLE);
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
// DMA Configuration
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
// reset DMA channel
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADC_values;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_PeripheralDataSize =
DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = MAX_ANALOG;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
// Enable DMA1 Channel Transfer Complete interrupt
DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);
// Enable DMA1 Channel Transfer Complete interrupt
DMA_Cmd(DMA1_Channel1, ENABLE); //Enable the DMA1 - Channel1
DMA_Cmd(DMA1_Channel1, ENABLE); //Enable the DMA1 - Channel1