STM32通過(guò)DMA采集多通道AD

環(huán)境：

主機(jī):XP

開(kāi)發(fā)環(huán)境:MDK4.23

MCU:STM32F103CBT6

說(shuō)明：

通過(guò)腳PA1,PA2采集AD。每路AD采集10次。

#include "ad_driver.h"

//全局變量

//AD采樣存放空間

__IO uint16_t ADCConvertedValue[20];

//函數(shù)

//初始化AD

void init_ad(void)

{

ADC_InitTypeDef ADC_InitStructure;

DMA_InitTypeDef DMA_InitStructure;

GPIO_InitTypeDef GPIO_InitStructure;

//---------------------充電AD初始化--------------------

//啟動(dòng)DMA時(shí)鐘

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

//啟動(dòng)ADC1時(shí)鐘

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

//采樣腳設(shè)置

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;

GPIO_Init(GPIOA, &GPIO_InitStructure);

//DMA1通道1配置

DMA_DeInit(DMA1_Channel1);

//外設(shè)地址

DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_ADDRESS;

//內(nèi)存地址

DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADCConvertedValue;

//dma傳輸方向單向

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;

//設(shè)置DMA在傳輸時(shí)緩沖區(qū)的長(zhǎng)度

DMA_InitStructure.DMA_BufferSize = 20;

//設(shè)置DMA的外設(shè)遞增模式，一個(gè)外設(shè)

DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

//設(shè)置DMA的內(nèi)存遞增模式

DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;

//外設(shè)數(shù)據(jù)字長(zhǎng)

DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;

//內(nèi)存數(shù)據(jù)字長(zhǎng)

DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;

//設(shè)置DMA的傳輸模式：連續(xù)不斷的循環(huán)模式

DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;

//設(shè)置DMA的優(yōu)先級(jí)別

DMA_InitStructure.DMA_Priority = DMA_Priority_High;

//設(shè)置DMA的2個(gè)memory中的變量互相訪問(wèn)

DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

DMA_Init(DMA1_Channel1, &DMA_InitStructure);

//使能通道1

DMA_Cmd(DMA1_Channel1, ENABLE);

//ADC1配置

//獨(dú)立工作模式

ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;

//掃描方式

ADC_InitStructure.ADC_ScanConvMode = ENABLE;

//連續(xù)轉(zhuǎn)換

ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;

//外部觸發(fā)禁止

ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;

//數(shù)據(jù)右對(duì)齊

ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;

//用于轉(zhuǎn)換的通道數(shù)

ADC_InitStructure.ADC_NbrOfChannel = 2;

ADC_Init(ADC1, &ADC_InitStructure);

//規(guī)則模式通道配置

ADC_RegularChannelConfig(ADC1, ADC_Channel_1 , 1, ADC_SampleTime_239Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_2 , 2, ADC_SampleTime_239Cycles5);

//使能ADC1的DMA

ADC_DMACmd(ADC1, ENABLE);

//使能ADC1

ADC_Cmd(ADC1, ENABLE);

//使能ADC1復(fù)位校準(zhǔn)寄存器

ADC_ResetCalibration(ADC1);

//檢查校準(zhǔn)寄存器是否復(fù)位完畢

while(ADC_GetResetCalibrationStatus(ADC1));

//開(kāi)始校準(zhǔn)

ADC_StartCalibration(ADC1);

//檢測(cè)是否校準(zhǔn)完畢

while(ADC_GetCalibrationStatus(ADC1));

//開(kāi)啟ADC1的軟件轉(zhuǎn)換

ADC_SoftwareStartConvCmd(ADC1, ENABLE);

}

//獲得充電電壓

float voltage_charge(void)

{

uint8_t i = 0;

uint16_t sum = 0;

float v = 0;

//取得10次充電電壓平均值

for (i = 0;i < 10;i++)

{

sum += ADCConvertedValue[i * 2];

}

sum /= 10;

//變換成電壓值

v = 0.002991 * sum;

return v;

}

//獲得放電電壓

float voltage_discharge(void)

{

uint8_t i = 0;

uint16_t sum = 0;

float v = 0;

//取得10次充電電壓平均值

for (i = 0;i < 10;i++)

{

sum += ADCConvertedValue[i * 2 + 1];

}

sum /= 10;

//變換成電壓值

v = 0.002991 * sum;

return v;

}