STM32F429IGT6单片机DMA-ADC多通道程序

ID:595030 · 发表于 2022-5-21 19:12

已在板子上正常运行读取了

adc.c

#include "adc.h"
#include "math.h"
__IO uint16_t ADC1ConvertedValue[4]={0,0,0,0};//定义的采集数据寄存数组
float AD_Vaule[4] = {0}; // AD转换值
void ADC1_DMA_Config(void)
{
ADC_InitTypeDef ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
DMA_InitTypeDef DMA_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
//打开ADC1，DMA2，GPIOA时钟，DMA1不行，没有ADC的通道，只能用DMA2
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 , ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
//通道选择,ADC1为0和4，ADC2为2和3，ADC3为0和1，
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
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; //外设普通模式
DMA_InitStructure.DMA_Priority = DMA_Priority_High;//高等优先级
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
// 外设基址为：ADC 数据寄存器地址
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADCx->DR;//ADCx一律宏定义成了ADC1
// 存储器地址
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC1ConvertedValue;
// 缓冲区大小，应该等于数据目的地的大小
DMA_InitStructure.DMA_BufferSize = 4;//几个通道就写几
// 外设寄存器只有一个，地址不用递增
DMA_Init(DMA2_Stream0, &DMA_InitStructure);
DMA_Cmd(DMA2_Stream0, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;//A4/A5/A6/A7
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOA, &GPIO_InitStructure);
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion=4;//
ADC_Init(ADCx, &ADC_InitStructure);
//一共四个通道的设置
ADC_RegularChannelConfig(ADCx, ADC_Channel_4, 1, ADC_SampleTime_3Cycles);
ADC_RegularChannelConfig(ADCx, ADC_Channel_5, 2, ADC_SampleTime_3Cycles);
ADC_RegularChannelConfig(ADCx, ADC_Channel_6, 3, ADC_SampleTime_3Cycles);
ADC_RegularChannelConfig(ADCx, ADC_Channel_7, 4, ADC_SampleTime_3Cycles);
ADC_DMARequestAfterLastTransferCmd(ADCx, ENABLE);
ADC_DMACmd(ADCx, ENABLE);
ADC_Cmd(ADCx, ENABLE);
}
void ADC1_GetVaule(void)
{
u8 i = 0;
u32 AD[4] = {0};
for(i=0;i<30;i++) // 进行30次转换
{
AD[0] =AD[0] + ADC1ConvertedValue[0]; // 求和
AD[1] =AD[1] + ADC1ConvertedValue[1]; // 求和
AD[2] =AD[2] + ADC1ConvertedValue[2]; // 求和
AD[3] =AD[3] + ADC1ConvertedValue[3]; // 求和
} // 启动转换
AD[0] =AD[0]/30;//平均值更稳定
AD[1] =AD[1]/30;
AD[2] =AD[2]/30;
AD[3] =AD[3]/30;
// while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC )); // 等待转换完毕
AD_Vaule[0] = (float)AD[0]/4096*3.3; // //转换成电压值
AD_Vaule[1] = (float)AD[1]/4096*3.3; // //转换成电压值
AD_Vaule[2] = (float)AD[2]/4096*3.3; // //转换成电压值
AD_Vaule[3] = (float)AD[3]/4096*3.3; // //转换成电压值
// AD_Vaule[0] = AD_Vaule[0] / 30; // 取平均值
// AD_Vaule[1] = AD_Vaule[1] / 30; // 取平均值
// AD_Vaule[2] = AD_Vaule[2] / 30; // 取平均值
// AD_Vaule[3] = AD_Vaule[3] / 30; // 取平均值
//
}