STM32 DMA传输中断方式配置源代码

ID:198180 · 发表于 2017-5-9 09:27

stm32单片机源程序：

#include "pbdata.h"
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
void USART_Configuration(void);
void ADC_Configuration(void);
void DMA_Configuration(void);
u16 ADCData[50];
u8 ADC_Ok=0;
int fputc(int ch,FILE *f)
{
USART_SendData(USART1,(u8)ch);
while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET);
return ch;
}
int main(void)
{
u32 ad=0;
u8 i=0;
RCC_Configuration(); //系统时钟初始化
GPIO_Configuration();//端口初始化
USART_Configuration();
NVIC_Configuration();
ADC_Configuration();
DMA_Configuration();
while(1)
{
ad=0;
if(ADC_Ok==1) //通道一传输完成否？
{
ADC_Ok=0;
for(i=0;i<50;i++)
{
ad=ad+ADCData[i];
}
ad=ad/50;
printf("ad =%f\r\n",3.3/4095*ad);//实际电压值
delay_ms(1000);
}
}
}
void RCC_Configuration(void)
{
SystemInit();//72m
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);
RCC_ADCCLKConfig(RCC_PCLK2_Div6);//12M 最大14M
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);
}
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
//LED
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9;//TX
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_Init(GPIOA,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;//RX
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0;//AD
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AIN;
GPIO_Init(GPIOC,&GPIO_InitStructure);
}
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void USART_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
USART_InitStructure.USART_BaudRate=9600;
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_Init(USART1,&USART_InitStructure);
USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
USART_Cmd(USART1,ENABLE);
USART_ClearFlag(USART1,USART_FLAG_TC);
}
void ADC_Configuration(void)
{
ADC_InitTypeDef ADC_InitStructure;
ADC_InitStructure.ADC_Mode=ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode=DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode=ENABLE;//////////////////////////////
ADC_InitStructure.ADC_ExternalTrigConv=ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign=ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel=1;
ADC_Init(ADC1,&ADC_InitStructure);
ADC_RegularChannelConfig(ADC1,ADC_Channel_10,1,ADC_SampleTime_239Cycles5);
ADC_DMACmd(ADC1,ENABLE);//重要
ADC_Cmd(ADC1,ENABLE);
ADC_ResetCalibration(ADC1);
while(ADC_GetResetCalibrationStatus(ADC1));
ADC_StartCalibration(ADC1);
while(ADC_GetCalibrationStatus(ADC1));
ADC_SoftwareStartConvCmd(ADC1,ENABLE);
}
void DMA_Configuration(void)
{
DMA_InitTypeDef DMA_InitStructure;
DMA_DeInit(DMA1_Channel1); //通道一连接ADC1
DMA_InitStructure.DMA_PeripheralBaseAddr=(u32)&ADC1->DR; //外设地址,源地址
DMA_InitStructure.DMA_MemoryBaseAddr=(u32)ADCData; //目标地址
DMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralSRC; //外设作为数据的来源
DMA_InitStructure.DMA_BufferSize=50; //和数组大小一样大
DMA_InitStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable; //ADC->DR地址是固定的外设存储地址不变
DMA_InitStructure.DMA_MemoryInc=DMA_MemoryInc_Enable; //数组地址递增的内存的地址是递增的
DMA_InitStructure.DMA_PeripheralDataSize=DMA_PeripheralDataSize_HalfWord; //外设的数据宽度 16位的
DMA_InitStructure.DMA_MemoryDataSize=DMA_MemoryDataSize_HalfWord; //内存的数据宽度=外设的数据宽度
DMA_InitStructure.DMA_Mode=DMA_Mode_Circular; //工作模式：连续的，让DMA不断的采集
DMA_InitStructure.DMA_Priority=DMA_Priority_High; //优先级:高
DMA_InitStructure.DMA_M2M=DMA_M2M_Disable; //外设到内存
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