本次的实验是通过配置DMA来获取ADC采集到的数据的。
软件实现如下：
adc.c文件
#include "adc.h"#define ADC1_DR_Address ((u32)0x40012400+0x4c) //定义ADC1地址volatile uint16_t ADCConvertedValue[2]; //定义内存地址数组float AD_Value[2];static void ADC1_GPIO_Config(void){ GPIO_InitTypeDef GPIO_InitStructure; /* Enable ADC1 and GPIOC clock */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOB, ENABLE); /* Configure PC.01 as analog input */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 |GPIO_Pin_1; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; GPIO_Init(GPIOB, &GPIO_InitStructure); // PB0，PB1 ,输入时不用设置速率}static void ADC1_DMA_Config(void){ DMA_InitTypeDef DMA_InitStructure; /* DMA channel1 configuration */ RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE); //使能DMA传输 DMA_DeInit(DMA1_Channel1); DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&(ADC1->DR); //ADC地址 DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADCConvertedValue; //内存地址 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; DMA_InitStructure.DMA_BufferSize = 2; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址固定 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存地址不固定 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //半字 DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //循环传输 DMA_InitStructure.DMA_Priority = DMA_Priority_High; DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; DMA_Init(DMA1_Channel1, &DMA_InitStructure);}static void ADC1_Config(void){ /* ADC1 configuration */ ADC_InitTypeDef ADC_InitStructure; ADC_DeInit(ADC1); RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE); //使能ADC1时钟 ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //独立ADC模式 ADC_InitStructure.ADC_ScanConvMode = ENABLE; //启动扫描模式，扫描模式用于多通道采集 ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //开启连续转换模式，即不停地进行ADC转换 ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //不使用外部触发转换 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //采集数据右对齐 ADC_InitStructure.ADC_NbrOfChannel = 2; //要转换的通道数目2 ADC_Init(ADC1, &ADC_InitStructure); /*配置ADC时钟，为PCLK2的6分频，即12Hz*/ RCC_ADCCLKConfig(RCC_PCLK2_Div6); /*配置ADC1的通道8,9为239.5个采样周期，序列为1，2*/ ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 1 , ADC_SampleTime_239Cycles5); ADC_RegularChannelConfig(ADC1, ADC_Channel_9, 2 , ADC_SampleTime_239Cycles5); /* Enable ADC1 DMA */ ADC_DMACmd(ADC1, ENABLE); /* Enable ADC1 */ ADC_Cmd(ADC1, ENABLE); /*复位校准寄存器 */ ADC_ResetCalibration(ADC1); /*等待校准寄存器复位完成 */ while(ADC_GetResetCalibrationStatus(ADC1)); /* ADC校准 */ ADC_StartCalibration(ADC1); /* 等待校准完成*/ while(ADC_GetCalibrationStatus(ADC1)); }void adc1_start(void){ ADC_SoftwareStartConvCmd(ADC1, ENABLE); //ADC1软计启动 DMA_Cmd(DMA1_Channel1, ENABLE); //使能DMA通道1}void ADC1_Init(void){ ADC1_GPIO_Config(); ADC1_DMA_Config(); ADC1_Config();} adc.h文件
#ifndef __ADC_H#define __ADC_H#includevoid ADC1_Init(void);void adc1_start(void);#endif /*ADC_H*/
main.c文件
#include "adc.h"extern volatile uint16_t ADCConvertedValue[2]; //定义内存地址数组extern float AD_Value[2];int main(void){ NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置中断优先级组为组2，2位抢占优先级，2位响应优先级 USART1_Int(); //串口初始化 ADC1_Init(); //ADC1初始化 adc1_start(); SysTick_Init(); //系统时钟初始化 while(1) { AD_Value[0]=(float)ADCConvertedValue[0]/4096*3.3; //获取电压值 AD_Value[1]=(float)ADCConvertedValue[1]/4096*3.3; //获取电流值 printf("\r\n电压值为：%f V\r\n",AD_Value[0]); printf("\r\n电流值为：%f A\r\n",(AD_Value[1]-2.5)/0.185); }} 本次实验的电流采集模块用的是ACS712模块，所以在打印输出时需要转换一下。