STM32F429IGT6單片機DMA-ADC多通道程序

ID:595030 · 發(fā)表于 2022-5-21 19:12

已在板子上正常運行讀取了

adc.c

#include "adc.h"
#include "math.h"
__IO uint16_t ADC1ConvertedValue[4]={0,0,0,0};//定義的采集數(shù)據(jù)寄存數(shù)組
float AD_Vaule[4] = {0}; // AD轉(zhuǎn)換值
void ADC1_DMA_Config(void)
{
ADC_InitTypeDef ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
DMA_InitTypeDef DMA_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
//打開ADC1，DMA2，GPIOA時鐘，DMA1不行，沒有ADC的通道，只能用DMA2
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 , ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
//通道選擇,ADC1為0和4，ADC2為2和3，ADC3為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; //外設(shè)普通模式
DMA_InitStructure.DMA_Priority = DMA_Priority_High;//高等優(yōu)先級
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;
// 外設(shè)基址為：ADC 數(shù)據(jù)寄存器地址
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADCx->DR;//ADCx一律宏定義成了ADC1
// 存儲器地址
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC1ConvertedValue;
// 緩沖區(qū)大小，應(yīng)該等于數(shù)據(jù)目的地的大小
DMA_InitStructure.DMA_BufferSize = 4;//幾個通道就寫幾
// 外設(shè)寄存器只有一個，地址不用遞增
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);
//一共四個通道的設(shè)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++) // 進(jìn)行30次轉(zhuǎn)換
{
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
} // 啟動轉(zhuǎn)換
AD[0] =AD[0]/30;//平均值更穩(wěn)定
AD[1] =AD[1]/30;
AD[2] =AD[2]/30;
AD[3] =AD[3]/30;
// while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC )); // 等待轉(zhuǎn)換完畢
AD_Vaule[0] = (float)AD[0]/4096*3.3; // //轉(zhuǎn)換成電壓值
AD_Vaule[1] = (float)AD[1]/4096*3.3; // //轉(zhuǎn)換成電壓值
AD_Vaule[2] = (float)AD[2]/4096*3.3; // //轉(zhuǎn)換成電壓值
AD_Vaule[3] = (float)AD[3]/4096*3.3; // //轉(zhuǎn)換成電壓值
// 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
//
}