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      1. 新聞中心

        EEPW首頁(yè) > 嵌入式系統(tǒng) > 設(shè)計(jì)應(yīng)用 > STM32學(xué)習(xí)筆記之ADC--DMA方式

        STM32學(xué)習(xí)筆記之ADC--DMA方式

        作者: 時(shí)間:2016-11-28 來(lái)源:網(wǎng)絡(luò) 收藏


        void DMA_Config(void)
        {
        DMA_InitTypeDef DMA_InitStructure;//定義DMA初始化結(jié)構(gòu)體
        DMA_DeInit(DMA_Channel1);//復(fù)位DMA通道1
        DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;//定義DMA通道外設(shè)基地址=ADC1_DR_Address
        DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADC_ConvertedValue; //定義DMA通道存儲(chǔ)器地址
        DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;//指定外設(shè)為源地址
        DMA_InitStructure.DMA_BufferSize = 1;//定義DMA緩沖區(qū)大小1
        DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//當(dāng)前外設(shè)寄存器地址不變
        DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;//當(dāng)前存儲(chǔ)器地址不變
        DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//定義外設(shè)數(shù)據(jù)寬度16位
        DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//定義存儲(chǔ)器數(shù)據(jù)寬度16位
        DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//DMA通道操作模式位環(huán)形緩沖模式
        DMA_InitStructure.DMA_Priority = DMA_Priority_High;//DMA通道優(yōu)先級(jí)高
        DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;//禁止DMA通道存儲(chǔ)器到存儲(chǔ)器傳輸
        DMA_Init(DMA_Channel1, &DMA_InitStructure);//初始化DMA通道1
        DMA_Cmd(DMA_Channel1, ENABLE);//使能DMA通道1
        }

        void ADC_Config(void)
        {
        ADC_InitTypeDef ADC_InitStructure;//定義ADC初始化結(jié)構(gòu)體變量
        ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;//ADC1和ADC2工作在獨(dú)立模式
        ADC_InitStructure.ADC_ScanConvMode = ENABLE; //使能掃描
        ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;//ADC轉(zhuǎn)換工作在連續(xù)模式
        ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;//有軟件控制轉(zhuǎn)換
        ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;//轉(zhuǎn)換數(shù)據(jù)右對(duì)齊
        ADC_InitStructure.ADC_NbrOfChannel = 1;//轉(zhuǎn)換通道為通道1
        ADC_Init(ADC1, &ADC_InitStructure); //初始化ADC
        ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 1, ADC_SampleTime_28Cycles5);
        //ADC1選擇信道14,音序器等級(jí)1,采樣時(shí)間239.5個(gè)周期
        ADC_DMACmd(ADC1, ENABLE);//使能ADC1模塊DMA
        ADC_Cmd(ADC1, ENABLE);//使能ADC1
        ADC_ResetCalibration(ADC1); //重置ADC1校準(zhǔn)寄存器
        while(ADC_GetResetCalibrationStatus(ADC1));//等待ADC1校準(zhǔn)重置完成
        ADC_StartCalibration(ADC1);//開(kāi)始ADC1校準(zhǔn)
        while(ADC_GetCalibrationStatus(ADC1));//等待ADC1校準(zhǔn)完成
        ADC_SoftwareStartConvCmd(ADC1, ENABLE); //使能ADC1軟件開(kāi)始轉(zhuǎn)換
        }

        void USART_Config(void)
        {
        USART_InitTypeDef USART_InitStructure; //定義串口初始化結(jié)構(gòu)體
        USART_InitStructure.USART_BaudRate = 115200;//波特率9600
        USART_InitStructure.USART_WordLength = USART_WordLength_8b;//8位數(shù)據(jù)
        USART_InitStructure.USART_StopBits = USART_StopBits_1;//1個(gè)停止位
        USART_InitStructure.USART_Parity = USART_Parity_No ; //無(wú)校驗(yàn)位
        USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
        //禁用RTSCTS硬件流控制
        USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//使能發(fā)送接收
        USART_InitStructure.USART_Clock = USART_Clock_Disable; //串口時(shí)鐘禁止
        USART_InitStructure.USART_CPOL = USART_CPOL_Low; //時(shí)鐘下降沿有效
        USART_InitStructure.USART_CPHA = USART_CPHA_2Edge;//數(shù)據(jù)在第二個(gè)時(shí)鐘沿捕捉
        USART_InitStructure.USART_LastBit = USART_LastBit_Disable;
        //最后數(shù)據(jù)位的時(shí)鐘脈沖不輸出到SCLK引腳
        USART_Init(USART2, &USART_InitStructure);//初始化串口2
        USART_Cmd(USART2, ENABLE);//串口2使能
        }

        void Put_String(u8 *p)
        {
        while(*p)
        {
        USART_SendData(USART2, *p++);
        while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET)
        {

        }
        }
        }

        void Delay(vu32 nCount)
        {
        for(; nCount != 0; nCount--);
        }

        PUTCHAR_PROTOTYPE
        {
        USART_SendData(USART2, (u8) ch);//發(fā)送一字節(jié)數(shù)據(jù)
        while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET)
        {
        }//等待發(fā)送完成
        return ch;
        }

        本文引用地址:http://www.biyoush.com/article/201611/322988.htm

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        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_14, 1, ADC_SampleTime_13Cycles5);


        ADC_Cmd(ADC1, ENABLE);


        ADC_SoftwareStartConvCmd(ADC1, ENABLE);
        }

        ADCVal = ADC_GetConversionValue(ADC1);//查詢方式


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