/*ADC_OVSR：过采样率，取值：2,4,8,16,32,64,128,256*/
#define ADC_OVSR 256
/*ADC_shift：ADC结果右移，取值：0~8*/
#define ADC_shift 4
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
ADC_InitType ADC_InitStructure;
DMA_InitType DMA_InitStructure;
__IO uint16_t ADCConvertedValue[256] = {0,};
__IO uint32_t ADCConvertedValue_16 = 0;
/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
uint16_t i,j ;
/* System clocks configuration */
RCC_Configuration();
/* GPIO configuration ------------------------------------------------------*/
GPIO_Configuration();
/* USART configuration */
UART_Print_Init(115200);
/* DMA1 channel1 configuration ----------------------------------------------*/
DMA_Reset(DMA1_Channel1);
DMA_DefaultInitParaConfig(&DMA_InitStructure);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->RDOR;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADCConvertedValue;
DMA_InitStructure.DMA_Direction = DMA_DIR_PERIPHERALSRC;
DMA_InitStructure.DMA_BufferSize = ADC_OVSR;
DMA_InitStructure.DMA_PeripheralInc = DMA_PERIPHERALINC_DISABLE;
DMA_InitStructure.DMA_MemoryInc = DMA_MEMORYINC_ENABLE;
DMA_InitStructure.DMA_PeripheralDataWidth = DMA_PERIPHERALDATAWIDTH_HALFWORD;
DMA_InitStructure.DMA_MemoryDataWidth = DMA_MEMORYDATAWIDTH_HALFWORD;
DMA_InitStructure.DMA_Mode = DMA_MODE_CIRCULAR;
DMA_InitStructure.DMA_Priority = DMA_PRIORITY_HIGH;
DMA_InitStructure.DMA_MTOM = DMA_MEMTOMEM_DISABLE;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
/* Enable DMA1 channel1 */
DMA_ChannelEnable(DMA1_Channel1, ENABLE);
/* ADC1 configuration ------------------------------------------------------*/
ADC_StructInit(&ADC_InitStructure);
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanMode = ENABLE;
ADC_InitStructure.ADC_ContinuousMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrig = ADC_ExternalTrig_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NumOfChannel = 1;
ADC_Init(ADC1, &ADC_InitStructure);
/* ADC1 regular channels configuration */
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_1_5);
/* Enable ADC1 DMA */
ADC_DMACtrl(ADC1, ENABLE);
/* Enable ADC1 */
ADC_Ctrl(ADC1, ENABLE);
/* Enable ADC1 reset calibration register */
ADC_RstCalibration(ADC1);
/* Check the end of ADC1 reset calibration register */
while(ADC_GetResetCalibrationStatus(ADC1));
/* Start ADC1 calibration */
ADC_StartCalibration(ADC1);
/* Check the end of ADC1 calibration */
while(ADC_GetCalibrationStatus(ADC1));
/* Start ADC1 Software Conversion */
ADC_SoftwareStartConvCtrl(ADC1, ENABLE);
while (1)
{
while( DMA_GetITStatus(DMA1_INT_TC1) == SET)
{
ADCConvertedValue_16 = 0;
for(i=0;i<ADC_OVSR;i++)
ADCConvertedValue_16 += ADCConvertedValue; //过采样求和
ADCConvertedValue_16 = (ADCConvertedValue_16>>ADC_shift)&0xFFFF; //求位移&取16位结果截断
DMA_ClearITPendingBit(DMA1_INT_TC1);
printf("ADCConvertedValue_16 = 0x%x\r\n",ADCConvertedValue_16);
}
}
}
/**
* @brief Configures the different system clocks.
* @param None
* @retval None
*/
void RCC_Configuration(void)
{
/* ADCCLK = PCLK2/4 */
RCC_ADCCLKConfig(RCC_APB2CLK_Div4);
/* Enable peripheral clocks ------------------------------------------------*/
/* Enable DMA1 clocks */
RCC_AHBPeriphClockCmd(RCC_AHBPERIPH_DMA1, ENABLE);
/* Enable ADC1 and GPIOA clocks */
RCC_APB2PeriphClockCmd(RCC_APB2PERIPH_ADC1 , ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPERIPH_GPIOA , ENABLE);
}
/**
* @brief Configures the different GPIO ports.
* @param None
* @retval None
*/
void GPIO_Configuration(void)
{
GPIO_InitType GPIO_InitStructure;
/* Configure PA0 (ADC Channel0) as analog input -------------------------*/
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pins = GPIO_Pins_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
|
楼主
标题置顶
标题高亮
