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trigger external TIM use for ADC conversion

Question asked by stm32.stm32 on Jun 1, 2011
i have a project of STM32f103 , i need to conversion a signal audio use ADC of STM32 , i use TIM1 for signal external trigger conversion for ADC , i config TIM , ADC and DMA to sample signal 8khz . i use DAM to tranfer data from ADC1_DR_Address(0x4001244C)  to SRAM ( first address  : 0x20000000 ) , and finally i use USART to tranfer data -> PC . but, my project not working ? 
atthough , PC recevei data , and display , but the value of bytes 0x00 . it point to that ADC not working , someone who can help me ? PLEASE ! 

#define SRAM_Address  ((uint32_t)0x20000000)
#define ADC1_DR_Address  ((uint32_t)0x4001244C)


#ifndef f32
#define   f32      float
#endif


GPIO_InitTypeDef GPIO_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
USART_InitTypeDef USART_InitStructure;
DMA_InitTypeDef           DMA_InitStructure;
TIM_TimeBaseInitTypeDef   TIM_TimeBaseStructure;
TIM_OCInitTypeDef         TIM_OCInitStructure;



void RCC_Configuration(void)
{

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
}


void Delay(__IO uint32_t num)
{
__IO uint32_t index = 0;

/* default system clock is 72MHz */
for(index = (72 * num); index != 0; index--)
{
}
}
int main(void)
{
u8 i;

/* Configure the system clocks */
RCC_Configuration();   

/* Configure PC.00 and PC.01 as input pull_up */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOC, &GPIO_InitStructure);



/* config PB.10-> PB.13 */ 
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10|GPIO_Pin_11|GPIO_Pin_12|GPIO_Pin_13;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);



/* 
*   configure UART pins   
*/   

/* Enable UART clock, if using USART2 or USART3 ... we must use RCC_APB1PeriphClockCmd(RCC_APB1Periph_USARTx, ENABLE) */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); 






/* Configure PA9 for USART Tx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* Configure PA10 for USART Rx as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);   

/* USARTx configured as follow:
- BaudRate = 115200 baud  
- Word Length = 8 Bits
- One Stop Bit
- No parity
- Hardware flow control disabled (RTS and CTS signals)
- Receive and transmit enabled
*/
USART_InitStructure.USART_BaudRate = 38400;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;   

/* USART configuration */
USART_Init(USART1, &USART_InitStructure);

/* Enable USART */
USART_Cmd(USART1, ENABLE);   






/* TIM1 configuration ------------------------------------------------------*/ 

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);


/* Time Base configuration */
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure); 
TIM_TimeBaseStructure.TIM_Period = 1499;      // tan so lay mau la 8 khz  (12MHz : 1500 = 8KHz)    
TIM_TimeBaseStructure.TIM_Prescaler = 0x5;     // 72MHz : 6 = 12MHz 
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;    
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;   // dem len 

TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;               
TIM_OCInitStructure.TIM_Pulse = 749;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;         
TIM_OC1Init(TIM1, &TIM_OCInitStructure);





/* DMA1 Channel1 Configuration ----------------------------------------------*/

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);


DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)SRAM_Address;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = 16000;          /*lay 10000 mau */        
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_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);




/* cho phep DMA1 channel1 */
DMA_Cmd(DMA1_Channel1, ENABLE);



/* 
*   configure ADC pins   
*/

/* Configure PA.01 (ADC Channel1) as analog input -------------------------*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* Configure clocks for ADC and GPIO PORT */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

/* ADCx configuration ------------------------------------------------------*/
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 1;
ADC_Init(ADC1, &ADC_InitStructure);   



/* ADC1 Regular Channel 1 Configuration */
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_55Cycles5);      

ADC_DMACmd(ADC1, ENABLE);

ADC_ExternalTrigConvCmd(ADC1, ENABLE);

/* Enable ADC1 */
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));
/*start convertion*/  
//ADC_SoftwareStartConvCmd(ADC1,ENABLE);



/* start main program */
while (1)   
{   
GPIO_WriteBit(GPIOB,GPIO_Pin_13, (BitAction)(1 - GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_13)));
Delay(50000);
while(GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_0)== 0)
{
Delay(50000);
while(GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_0) == 0)
{
TIM_Cmd(TIM1, ENABLE);                    // lay mau khi bam nut 
}
}
TIM_Cmd(TIM1,DISABLE);
while(GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_1) == 0)
{
Delay(1000);
while(GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_1) == 0)
{
GPIO_WriteBit(GPIOB,GPIO_Pin_10, (BitAction) (1));
for(i=0;i<=40000;i++)
{
USART_SendData(USART1,*(uint8_t *)(SRAM_Address + i));
Delay(80);
}
GPIO_WriteBit(GPIOB,GPIO_Pin_10,( BitAction) (0));
}
}
}
}




what thing i wrong ?  who can tell me where i wrong . thanks 

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