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// 初始化 DMA 及 ADC 程序
extern u16 adc_dma_tab[10][3];
void dma_init() //DMA初始化
{
//结构体定义
GPIO_InitTypeDef GPIO_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO|RCC_APB2Periph_ADC1,ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);
RCC_ADCCLKConfig(RCC_PCLK2_Div6);//12M 最大14M 设置ADC时钟(ADCCLK)
ADC_DeInit(ADC1);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_1;//ADC //1
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AIN; //模拟输入
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure); //A
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0 | GPIO_Pin_1;//ADC //1
GPIO_Init(GPIOB,&GPIO_InitStructure); //A
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 3;
ADC_Init(ADC1, &ADC_InitStructure);
//设置指定ADC的规则组通道,设置它们的转化顺序和采样时间
ADC_RegularChannelConfig(ADC1,ADC_Channel_1,1,ADC_SampleTime_55Cycles5); //1
ADC_RegularChannelConfig(ADC1,ADC_Channel_8,2,ADC_SampleTime_55Cycles5); //1
ADC_RegularChannelConfig(ADC1,ADC_Channel_9,3,ADC_SampleTime_55Cycles5); //1
//内部温度传感器是在ADC1通道16的。
// ADC_RegularChannelConfig(ADC1,ADC_Channel_16,1,ADC_SampleTime_239Cycles5);
// ADC_TempSensorVrefintCmd(ENABLE);//打开内部温度传感器使能
ADC_DMACmd(ADC1,ENABLE);//将ADC与DMA链接在一起
ADC_Cmd(ADC1,ENABLE);
ADC_ResetCalibration(ADC1);//重置指定的ADC的校准寄存器
while(ADC_GetResetCalibrationStatus(ADC1));//获取ADC重置校准寄存器的状态
ADC_StartCalibration(ADC1);//开始指定ADC的校准状态
while(ADC_GetCalibrationStatus(ADC1));//获取指定ADC的校准程序
ADC_SoftwareStartConvCmd(ADC1, ENABLE);//使能或者失能指定的ADC的软件转换启动功能
ADC_Cmd(ADC1,DISABLE);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel=DMA1_Channel1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr =(u32)&ADC1->DR;//DMA外设地址
DMA_InitStructure.DMA_MemoryBaseAddr=(u32)&adc_dma_tab;//DMA内存地址
DMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralSRC;//外设作为数据传输的来源
DMA_InitStructure.DMA_BufferSize=30;//指定DMA通道的DMA缓存的大小
DMA_InitStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable;//外设地址寄存器递增
DMA_InitStructure.DMA_MemoryInc=DMA_PeripheralInc_Enable;//内存地址寄存器递增
DMA_InitStructure.DMA_PeripheralDataSize=DMA_PeripheralDataSize_HalfWord;//外设数据宽度16
DMA_InitStructure.DMA_MemoryDataSize=DMA_MemoryDataSize_HalfWord;//存储数据宽度16
DMA_InitStructure.DMA_Mode=DMA_Mode_Circular;//工作在循环缓存模式
// DMA_InitStructure.DMA_Mode=DMA_Mode_Normal;//工作在循环缓存模式
DMA_InitStructure.DMA_Priority=DMA_Priority_High;//DMA通道x拥有高优先级
DMA_InitStructure.DMA_M2M=DMA_M2M_Disable;//DMA通道x没有设置为内存到内存传输
DMA_Init(DMA1_Channel1,&DMA_InitStructure); //ADC1在DMA1通道1内
DMA_ITConfig(DMA1_Channel1,DMA_IT_TC,ENABLE); // 中断
DMA_Cmd(DMA1_Channel1,ENABLE);//使能DMA1
ADC_Cmd(ADC1,ENABLE);
}
//DMA 中断程序
void DMA1_Channel1_IRQHandler()
{
if(DMA_GetITStatus(DMA_IT_TC)) //判断DMA传输完成中断
{
DMA_Cmd(DMA1_Channel1, DISABLE);
adc_finish = 1; //置采样完成标志位
DMA_ClearITPendingBit(DMA_IT_TC); //清除DMA中断标志位
}
}
//主程序
int main()
{
u16 value;
u8 i,j,k,dat[7];
float ad;
dma_init(); //DMA初始化
TFT_Init(); //TFT彩屏初始化
LED_Init(); //端口初始化
printf_init(); //printf初始化
TFT_ClearScreen(BLACK); //清屏
GUI_Show12ASCII(10,10,"This is a ADC1-DMA1 Check!",YELLOW,BLACK);
GUI_Show12ASCII(10,27,"PA1 is AD Input!",YELLOW,BLACK);
GUI_Show12ASCII(10,100,"The AD Volage is:",YELLOW,BLACK);
while(1)
{
if (adc_finish==1) {
for (i=0;i<3;i++) {
value=0;
for(k=0;k<10;k++)//读取10次的AD数值取其平均数较为准确
{
value=value+adc_dma_tab[k][i];
}
value=value/10;
ad=value*3.3/4096;
value=(u32)(ad*1000);
dat[0]=value/1000+0x30;
dat[1]='.';
dat[2]=value%1000/100+0x30;
dat[3]=value%100/10+0x30;
dat[4]=value%10+0x30;
dat[5]='V';
dat[6]='\0';
GUI_Show12ASCII(160,100+i*16,dat,YELLOW,BLACK);
}
adc_finish=0;
delay_ms(500);
DMA_Cmd(DMA1_Channel1, ENABLE);
if(j>1)
{
j=0;
GPIO_SetBits(GPIOC,GPIO_Pin_0);
}
else
{
j++;
GPIO_ResetBits(GPIOC,GPIO_Pin_0);
}
}
}
}