stm32單片機源程序：
- #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(); //系統時鐘初始化
- GPIO_Configuration();//端口初始化
- USART_Configuration();
- NVIC_Configuration();
- ADC_Configuration();
- DMA_Configuration();
-
- while(1)
- {
- ad=0;
- if(ADC_Ok==1) //通道一傳輸完成否？
- {
- 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);//實際電壓值
- 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); //通道一連接ADC1
- DMA_InitStructure.DMA_PeripheralBaseAddr=(u32)&ADC1->DR; //外設地址,源地址
- DMA_InitStructure.DMA_MemoryBaseAddr=(u32)ADCData; //目標地址
- DMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralSRC; //外設作為數據的來源
- DMA_InitStructure.DMA_BufferSize=50; //和數組大小一樣大
- DMA_InitStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable; //ADC->DR地址是固定的 外設存儲地址不變
- DMA_InitStructure.DMA_MemoryInc=DMA_MemoryInc_Enable; //數組地址遞增的 內存的地址是遞增的
- DMA_InitStructure.DMA_PeripheralDataSize=DMA_PeripheralDataSize_HalfWord; //外設的數據寬度 16位的
- DMA_InitStructure.DMA_MemoryDataSize=DMA_MemoryDataSize_HalfWord; //內存的數據寬度=外設的數據寬度
- DMA_InitStructure.DMA_Mode=DMA_Mode_Circular; //工作模式：連續的，讓DMA不斷的采集
- DMA_InitStructure.DMA_Priority=DMA_Priority_High; //優先級:高
- DMA_InitStructure.DMA_M2M=DMA_M2M_Disable; //外設到內存
- …………限于本文篇幅 余下代碼請從51黑下載附件…………
完整代碼下載：
中斷方法DMA.7z
(186.66 KB, 下載次數: 302)
2021-9-29 03:23 上傳
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