2019年06月29日 | STM32 配置AD,配置DMA

STM32f105rct6:配置AD，配置DMA 两路AD取值通道： 

配置AD:

void ADC_Configuration(void)

{

    ADC_InitTypeDef ADC_InitStructure;

    ADC_StructInit(&ADC_InitStructure);

    /* ADC1 configuration ------------------------------------------------------*/

    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;

    ADC_InitStructure.ADC_ScanConvMode = ENABLE;

    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;

    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;//软件启动

    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;

    ADC_InitStructure.ADC_NbrOfChannel = 2; // 通道数目

    ADC_Init(ADC1, &ADC_InitStructure);

    /* ADC1 regular channel14 configuration */

    //ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 1, ADC_SampleTime_55Cycles5);

    ADC_RegularChannelConfig(ADC1, ADC_Channel_9, 2, ADC_SampleTime_55Cycles5);

    ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 1, ADC_SampleTime_55Cycles5);

    //ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 2, ADC_SampleTime_55Cycles5);

    //ADC_RegularChannelConfig(ADC1, ADC_Channel_15, 4, ADC_SampleTime_55Cycles5);

//  假设你定义channle1  的rank=1，channle2 的rank=2，

//那么对应你在DMA缓存空间的变量数组AdcDMA[0] 就i是channle1的转换结果，

//AdcDMA[1]就是通道2的转换结果。

    /* Enable ADC1 DMA */

    ADC_DMACmd(ADC1, ENABLE);

    /* Enable ADC1 */

    ADC_Cmd(ADC1, ENABLE);

    /* Enable ADC1 reset calibaration register */

    ADC_ResetCalibration(ADC1);

    /* Check the end of ADC1 reset calibration register */

    while (ADC_GetResetCalibrationStatus(ADC1));

    /* Start ADC1 calibaration */

    ADC_StartCalibration(ADC1);

    /* Check the end of ADC2 calibration */

    while (ADC_GetCalibrationStatus(ADC1));

    ADC_SoftwareStartConvCmd(ADC1, ENABLE); //使能ADC1软件开始转换

}

配置DMA: 

芯片里的寄存器基地址： 

//#define SPI1_DR_Address 0x4001300C 

//#define SPI2_DR_Address 0x4000380C

//#define ADC1_DR_Address 0x4001244C 

//#define USART1_DR_Base 0x40013804 

//#define USART2_DR_Base 0x40004404

void DMA_Configuration(void)

{

    DMA_InitTypeDef DMA_InitStructure;

    DMA_StructInit(&DMA_InitStructure);

    DMA_DeInit(DMA1_Channel1);

    DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;//DMA外设ADC基地址

    DMA_InitStructure.DMA_MemoryBaseAddr = (u32)g_stuKEY.KeyAD;//DMA内存基地址  数组：g_stuKEY.KeyAD[2]

    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;//传输方向

    DMA_InitStructure.DMA_BufferSize = 2;// 2//DMA通道的DMA缓存的大小

    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外设地址不变

    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//内存地址递增

    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;

    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //16 bit

    DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;

    DMA_InitStructure.DMA_Priority = DMA_Priority_High;

    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

    DMA_Init(DMA1_Channel1, &DMA_InitStructure);

    //DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);

    /* Enable DMA1 channel1 */

    DMA_Cmd(DMA1_Channel1, ENABLE);

}

直接使用数组里的数据，已经通过DMA 转化存放好

u16 GetVotFromAD(g_stuKEY.KeyAD[0])

{

    //u16 int_part,float_part;

    u16 temp;

    temp = u16AD;

    //把采集到的数据转换成电压值

    temp = (u16)((((u32)temp) * 3300) >> 12);

    //int_part   = temp/1000;

    //float_part = temp%1000;

    return temp;

}