STM32F1 Discoveryboard - Adc

// aus setup.h

/* ADC definitions */

#define SPAREINPUT_ADC              ADC1

#define SPAREINPUT_CHANNEL          ADC_Channel_0

#define SPAREINPUT_GPIO_PORT        GPIOA

#define SPAREINPUT_GPIO_PIN         GPIO_Pin_0

/* Speed Input */

#define SPEEDINPUT_ADC              ADC1

#define SPEEDINPUT_CHANNEL          ADC_Channel_1

#define SPEEDINPUT_GPIO_PORT        GPIOA

#define SPEEDINPUT_GPIO_PIN         GPIO_Pin_1

/* Only for 1 shunt resistor case */

#define PHASE_CURRENTS_ADC              ADC1

#define PHASE_CURRENTS_CHANNEL          ADC_Channel_2

#define PHASE_CURRENTS_GPIO_PORT        GPIOA

#define PHASE_CURRENTS_GPIO_PIN         GPIO_Pin_2

/** Bus and temperature readings **/

#define TEMP_ADC                        ADC1

#define TEMP_CHANNEL                    ADC_Channel_3

#define TEMP_GPIO_PORT                  GPIOA

#define TEMP_GPIO_PIN                   GPIO_Pin_3

typedef struct ADCValues

{

  uint16_t spare1;

  uint16_t speedInput;

  uint16_t current;

  uint16_t temp;

  uint16_t spare2;

} ADCValues_t;

// aus main.c

volatile ADCValues_t ADCRead;

/* Init the ADC converter to free-run with 4 channels

 *

 */

void ADCInit(void) {

ADC_InitTypeDef       ADC_InitStructure;

DMA_InitTypeDef    DMA_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);

RCC_ADCCLKConfig(RCC_PCLK2_Div8);

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

/* DMA1 channel1 configuration ----------------------------------------------*/

  DMA_DeInit(DMA1_Channel1);    // Clear everything we had 

  DMA_InitStructure.DMA_PeripheralBaseAddr =  (uint32_t)&(ADC1->DR); // Source is the ADC data register

  DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADCRead;      // Its the destination here

  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;   // from Peripheral to RAM

  DMA_InitStructure.DMA_BufferSize = 4;    /// Note that we have 4 Channels

  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;  // Source stays same address

  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;     // Destination will be incremented

  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;  // 16 bit results

  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;   // yeah same size -> 16 bit

  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;  // Wrap around the destination address

  DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;   // why not? its the only DMA thingy in this program

  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;   // we don't want RAM to RAM

  DMA_Init(DMA1_Channel1, &DMA_InitStructure);   // Init the stuff finally 

  /* Enable DMA1 channel1 */

  DMA_Cmd(DMA1_Channel1, ENABLE);  // Run, but we wait for the ADC init

/* ADC1 configuration

 * 4 channel continuous

 */

ADC_DeInit(ADC1);   // again clear the whole ADC out

ADC_StructInit(&ADC_InitStructure);

ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;    // no external triggers here

ADC_InitStructure.ADC_ScanConvMode = ENABLE;

ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;

ADC_InitStructure.ADC_NbrOfChannel = 4;

ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;

ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;

/* Now do the setup */

ADC_DMACmd(ADC1, ENABLE);

ADC_Init(ADC1, &ADC_InitStructure);

/* Enable ADC1 */

ADC_RegularChannelConfig(ADC1,SPAREINPUT_CHANNEL,1,ADC_SampleTime_239Cycles5);

ADC_RegularChannelConfig(ADC1,SPEEDINPUT_CHANNEL,2,ADC_SampleTime_239Cycles5);

ADC_RegularChannelConfig(ADC1,PHASE_CURRENTS_CHANNEL,3,ADC_SampleTime_239Cycles5);

ADC_RegularChannelConfig(ADC1,TEMP_CHANNEL,4,ADC_SampleTime_239Cycles5);

ADC_Cmd(ADC1, ENABLE);

/* Enable ADC1 reset calibaration register */

ADC_ResetCalibration(ADC1);

/* Check the end of ADC1 reset calibration register */

while(ADC_GetResetCalibrationStatus(ADC1));

/* Start ADC1 calibaration */

ADC_StartCalibration(ADC1);

/* Check the end of ADC1 calibration */

while(ADC_GetCalibrationStatus(ADC1));

ADC_SoftwareStartConvCmd(ADC1,ENABLE);

Delay(200);

}