STM32 ADC多通道转换

＃i nclude "stm32f10x.h" //这个头文件包括STM32F10x所有外围寄存器、位、内存映射的定义

＃i nclude "eval.h" //头文件（包括串口、按键、LED的函数声明）

＃i nclude "SysTickDelay.h"

＃i nclude "UART_INTERFACE.h"

＃i nclude <stdio.h>



#define N 50 //每通道采50次

#define M 12 //为12个通道



vu16 AD_Value[N][M]; //用来存放ADC转换结果，也是DMA的目标地址

vu16 After_filter[M]; //用来存放求平均值之后的结果

int i;







void GPIO_Configuration(void)

{

GPIO_InitTypeDef GPIO_InitStructure;



GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //因为USART1管脚是以复用的形式接到GPIO口上的，所以使用复用推挽式输出

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA, &GPIO_InitStructure);





GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

GPIO_Init(GPIOA, &GPIO_InitStructure);







//PA0/1/2 作为模拟通道输入引脚

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0| GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //模拟输入引脚

GPIO_Init(GPIOA, &GPIO_InitStructure);



//PB0/1 作为模拟通道输入引脚

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //模拟输入引脚

GPIO_Init(GPIOB, &GPIO_InitStructure);



//PC0/1/2/3/4/5 作为模拟通道输入引脚

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //模拟输入引脚

GPIO_Init(GPIOC, &GPIO_InitStructure);

}



}





void RCC_Configuration(void)

{

ErrorStatus HSEStartUpStatus;



RCC_DeInit(); //RCC 系统复位

RCC_HSEConfig(RCC_HSE_ON); //开启HSE

HSEStartUpStatus = RCC_WaitForHSEStartUp(); //等待HSE准备好

if(HSEStartUpStatus == SUCCESS)

{

FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable); //Enable Prefetch Buffer

FLASH_SetLatency(FLASH_Latency_2); //Set 2 Latency cycles

RCC_HCLKConfig(RCC_SYSCLK_Div1); //AHB clock = SYSCLK

RCC_PCLK2Config(RCC_HCLK_Div1); //APB2 clock = HCLK

RCC_PCLK1Config(RCC_HCLK_Div2); //APB1 clock = HCLK/2

RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_6); //PLLCLK = 12MHz * 6 = 72 MHz

RCC_PLLCmd(ENABLE); //Enable PLL

while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET); //Wait till PLL is ready

RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); //Select PLL as system clock source

while(RCC_GetSYSCLKSource() != 0x08); //Wait till PLL is used as system clock source



RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB

| RCC_APB2Periph_GPIOC |RCC_APB2Periph_ADC1 | RCC_APB2Periph_AFIO |RCC_APB2Periph_USART1, ENABLE ); //使能ADC1通道时钟，各个管脚时钟



RCC_ADCCLKConfig(RCC_PCLK2_Div6); //72M/6=12,ADC最大时间不能超过14M

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //使能DMA传输



}

}





void ADC1_Configuration(void)

{

ADC_InitTypeDef ADC_InitStructure;



ADC_DeInit(ADC1); //将外设 ADC1 的全部寄存器重设为缺省值





ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //ADC工作模式:ADC1和ADC2工作在独立模式

ADC_InitStructure.ADC_ScanConvMode =ENABLE; //模数转换工作在扫描模式

ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //模数转换工作在连续转换模式

ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //外部触发转换关闭

ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //ADC数据右对齐

ADC_InitStructure.ADC_NbrOfChannel = M; //顺序进行规则转换的ADC通道的数目

ADC_Init(ADC1, &ADC_InitStructure); //根据ADC_InitStruct中指定的参数初始化外设ADCx的寄存器





//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

//ADC1,ADC通道x,规则采样顺序值为y,采样时间为239.5周期

ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_239Cycles5 );

ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_239Cycles5 );

ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 3, ADC_SampleTime_239Cycles5 );

ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 4, ADC_SampleTime_239Cycles5 );

ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 5, ADC_SampleTime_239Cycles5 );

ADC_RegularChannelConfig(ADC1, ADC_Channel_9, 6, ADC_SampleTime_239Cycles5 );

ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 7, ADC_SampleTime_239Cycles5 );

ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 8, ADC_SampleTime_239Cycles5 );

ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 9, ADC_SampleTime_239Cycles5 );

ADC_RegularChannelConfig(ADC1, ADC_Channel_13, 10, ADC_SampleTime_239Cycles5 );

ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 11, ADC_SampleTime_239Cycles5 );

ADC_RegularChannelConfig(ADC1, ADC_Channel_15, 12, ADC_SampleTime_239Cycles5 );



// 开启ADC的DMA支持（要实现DMA功能，还需独立配置DMA通道等参数）

ADC_DMACmd(ADC1, ENABLE);





ADC_Cmd(ADC1, ENABLE); //使能指定的ADC1



ADC_ResetCalibration(ADC1); //复位指定的ADC1的校准寄存器



while(ADC_GetResetCalibrationStatus(ADC1)); //获取ADC1复位校准寄存器的状态,设置状态则等待





ADC_StartCalibration(ADC1); //开始指定ADC1的校准状态



while(ADC_GetCalibrationStatus(ADC1)); //获取指定ADC1的校准程序,设置状态则等待





}





void DMA_Configuration(void)

{



DMA_InitTypeDef DMA_InitStructure;

DMA_DeInit(DMA1_Channel1); //将DMA的通道1寄存器重设为缺省值

DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&ADC1->DR; //DMA外设ADC基地址

DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&AD_Value; //DMA内存基地址

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //内存作为数据传输的目的地

DMA_InitStructure.DMA_BufferSize = N*M; //DMA通道的DMA缓存的大小

DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址寄存器不变

DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存地址寄存器递增

DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //数据宽度为16位

DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //数据宽度为16位

DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //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); //根据DMA_InitStruct中指定的参数初始化DMA的通道



}





//配置所有外设

void Init_All_Periph(void)

{



RCC_Configuration();



GPIO_Configuration();



ADC1_Configuration();



DMA_Configuration();



//USART1_Configuration();

USART_Configuration(9600);





}







u16 GetVolt(u16 advalue)



{



return (u16)(advalue * 330 / 4096); //求的结果扩大了100倍，方便下面求出小数



}









void filter(void)

{

int sum = 0;

u8 count;

for(i=0;i<12;i++)



{



for ( count=0;count<N;count++)



{



sum += AD_Value[count][i];



}



After_filter[i]=sum/N;



sum=0;

}



}









int main(void)

{



u16 value[M];



init_All_Periph();

SysTick_Initaize();





ADC_SoftwareStartConvCmd(ADC1, ENABLE);

DMA_Cmd(DMA1_Channel1, ENABLE); //启动DMA通道

while(1)

{

while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET);//等待传输完成否则第一位数据容易丢失



filter();

for(i=0;i<12;i++)

{

value[i]= GetVolt(After_filter[i]);



printf("value[%d]:\t%d.%dv\n",i,value[i]/100,value[i]0) ;

delay_ms(100);

}

}



}