Working with stm32f407 ADC+TIMER+DMA

#include "stm32f4_discovery.h"
void RCC_Configuration(void)

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC2, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

/***************************************************************************/ 
void GPIO_Configuration(void)

GPIO_InitTypeDef GPIO_InitStructure; 
/* ADC Channel 10 -> PC0
ADC Channel 11 -> PC1
*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOC, &GPIO_InitStructure);
} 
/***************************************************************************/ 
void ADC_Configuration(void)

ADC_CommonInitTypeDef ADC_CommonInitStructure;
ADC_InitTypeDef ADC_InitStructure;
/* ADC Common Init */
ADC_CommonInitStructure.ADC_Mode = ADC_DualMode_RegSimult;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1; 
// 2 half-words one by one, 1 then 2
ADC_CommonInitStructure.ADC_TwoSamplingDelay =  ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE; // 1 Channel
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; // Conversions Triggered
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_Init(ADC2, &ADC_InitStructure); // Mirror on ADC2
/* ADC1 regular channel 10 configuration */
ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 1, 
ADC_SampleTime_15Cycles); 
// PC0
/* ADC2 regular channel 11 configuration */
ADC_RegularChannelConfig(ADC2, ADC_Channel_11, 1, 
ADC_SampleTime_15Cycles); 
// PC1
/* Enable DMA request after last transfer (Multi-ADC mode)  */
ADC_MultiModeDMARequestAfterLastTransferCmd(ENABLE);
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE); 
/* Enable ADC2 */
ADC_Cmd(ADC2, ENABLE);

/**************************************************************************/
# define BUFFERSIZE 800 // I+Q 200KHz x2 HT/TC at 1KHz
__IO uint16_t ADCDualConvertedValues[BUFFERSIZE]; // Filled as pairs ADC1, ADC2
static void DMA_Configuration(void)

DMA_InitTypeDef DMA_InitStructure;
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADCDualConvertedValues;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)0x40012308; 
// CDR_ADDRESS; Packed ADC1, ADC2
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = BUFFERSIZE; // Count of 16-bit words
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_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Enable;
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);
/* Enable DMA Stream Half / Transfer Complete interrupt */
DMA_ITConfig(DMA2_Stream0, DMA_IT_TC | DMA_IT_HT, ENABLE); 
/* DMA2_Stream0 enable */
DMA_Cmd(DMA2_Stream0, ENABLE);
} 
void TIM2_Configuration(void)

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
/* Time base configuration */
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = (84000000 / 200000) - 1; 
// 200 KHz, from 84 MHz TIM2CLK (ie APB1 = HCLK/4, TIM2CLK = HCLK/2)
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); 
/* TIM2 TRGO selection */
TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update); 
// ADC_ExternalTrigConv_T2_TRGO

 /* TIM2 enable counter */  TIM_Cmd(TIM2, ENABLE);}           /****************************************************************************/            void NVIC_Configuration(void){ NVIC_InitTypeDef NVIC_InitStructure;            /* Enable the DMA Stream IRQ Channel */  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);}           /***********************************************************************/void DMA2_Stream0_IRQHandler(void)//Called at 1 KHz for 200 KHz sample rate{ /* Test on DMA Stream Half Transfer interrupt */ if(DMA_GetITStatus(DMA2_Stream0, DMA_IT_HTIF0)) {  /* Clear DMA Stream Half Transfer interrupt pending bit */  DMA_ClearITPendingBit(DMA2_Stream0, DMA_IT_HTIF0);   /* Turn LED3 off: Half Transfer */  STM_EVAL_LEDOff(LED3);   // Add code here to process first half of buffer (ping) }            /* Test on DMA Stream Transfer Complete interrupt */ if(DMA_GetITStatus(DMA2_Stream0, DMA_IT_TCIF0)) {  /* Clear DMA Stream Transfer Complete interrupt pending bit */  DMA_ClearITPendingBit(DMA2_Stream0, DMA_IT_TCIF0);  /* Turn LED3 on: End of Transfer */  STM_EVAL_LEDOn(LED3);   // Add code here to process second half of buffer (pong)  } }            /*****************************************************************************/            int main(void) {  RCC_Configuration();   GPIO_Configuration();   NVIC_Configuration();   TIM2_Configuration();   DMA_Configuration();   ADC_Configuration();  STM_EVAL_LEDInit(LED3); /* Configure LEDs to monitor program status            */  STM_EVAL_LEDOn(LED3); /* Turn LED3 on, 500 Hz means it working */   /* Start ADC1 Software Conversion */  ADC_SoftwareStartConv(ADC1);             while(1); // Don't want to exit }  /***************************************************************************/}