STM32F1库函数初始化系列：DMA—ADC采集

 1 void ADC_Configure(void)
 2 {
 3    ADC_InitTypeDef ADC_InitStructure;
 4 　 GPIO_InitTypeDef GPIO_InitStructure;
 5    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);
 6 　　RCC_AHBPeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);
 7
 8    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6;
 9    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
10    GPIO_Init(GPIOA, &GPIO_InitStructure);
11
12     RCC_ADCCLKConfig(RCC_PCLK2_Div4);                                         //配置ADC时钟分频  2,4,6,8
13     ADC_InitStructure.ADC_Mode=ADC_Mode_Independent;                          //独立工作模式
14     ADC_InitStructure.ADC_ScanConvMode=ENABLE;                                //工作在扫描模式
15     ADC_InitStructure.ADC_ContinuousConvMode=ENABLE;                          //连续模式
16     ADC_InitStructure.ADC_ExternalTrigConv=ADC_ExternalTrigConv_None;         //转换由软件触发启动
17     //ADC_InitStructure.ADC_ExternalTrigConv=ADC_ExternalTrigConv_T1_CC1;     //定时器1的捕获比较通道1作为外部触发转换源（T1_2,T1_3,T2_2,T4_4）
18     //ADC_InitStructure.ADC_ExternalTrigConv=ADC_ExternalTrigConv_Ext_1T11;   //外部中断通道11的事件作为外部触发转换源
19     ADC_InitStructure.ADC_DataAlign=ADC_DataAlign_Right;                      //ADC数据右对齐
20     ADC_InitStructure.ADC_NbrOfChannel =5;                                    //进行规则转换的ADC通道的数目为2
21     ADC_Init(ADC1,&ADC_InitStructure);
22     ADC_RegularChannelConfig(ADC1,ADC_Channel_2,1,ADC_SampleTime_55Cycles5);   //选择通道2，转换顺序1,采样时间为1.5周期
23      ADC_RegularChannelConfig(ADC1,ADC_Channel_3,2,ADC_SampleTime_55Cycles5);  //选择通道3，转换顺序2,采样时间为1.5周期
24     ADC_RegularChannelConfig(ADC1,ADC_Channel_4,3,ADC_SampleTime_55Cycles5);  //选择通道4，转换顺序3,采样时间为1.5周期
25     ADC_RegularChannelConfig(ADC1,ADC_Channel_5,4,ADC_SampleTime_55Cycles5);  //选择通道5，转换顺序4,采样时间为1.5周期
26     ADC_RegularChannelConfig(ADC1,ADC_Channel_6,5,ADC_SampleTime_55Cycles5);  //选择通道6，转换顺序5,采样时间为1.5周期
27     ADC_DMACmd(ADC1, ENABLE);
28     ADC_Cmd(ADC1,ENABLE);                                                     //使能AD1
29     ADC_ResetCalibration(ADC1);                                               //复位ADC1的校准寄存器
30     ADC_StartCalibration(ADC1);                                                                                                //开始ADC1的校准
31     while(ADC_GetCalibrationStatus(ADC1));                                                                        //等待ADC1校准完成
32     ADC_SoftwareStartConvCmd(ADC1,ENABLE);                                                                        //启动ADC1转换
33 }
34 void DMA_Configure(void)
35 {
36     DMA_InitTypeDef DMA_InitStructure;
37     RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);
38     DMA_DeInit(DMA1_Channel1);                                                                                                //复位DMA1通道
39     DMA_InitStructure.DMA_PeripheralBaseAddr=DR_ADDRESS;
40     DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ad_value;
41   　　DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;                                                //外设作为数据传输的来源
42     DMA_InitStructure.DMA_M2M=DMA_M2M_Disable;
43   　DMA_InitStructure.DMA_BufferSize = 5;                                                                        //
44   DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;                    //外设地址不变
45   DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;                                        //内存地址递增
46   DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;    //外设数据宽度为16位
47   DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;                //内存数据宽度为16位
48   DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;                                                        //循环缓存模式
49   DMA_InitStructure.DMA_Priority = DMA_Priority_High;                                                //高优先级
50   DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;                                                            //没有设置内存到内存的传输
51   DMA_Init(DMA1_Channel1, &DMA_InitStructure);
52     DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);
53     DMA_Cmd(DMA1_Channel1,ENABLE);                                                                                        //开启DMA1通道传输
54 }