adc.c
#include "adc.h"
#include "usart.h"
u8 flag=0;
volatile u16 AD_Value[500]={0};
//volatile u16 AD_Value;
void ADCx_GPIO_Init()
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //模拟输入引脚
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void ADCx_Base_Init()
{
ADC_InitTypeDef ADC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE); //使能ADC1时钟
RCC_ADCCLKConfig(RCC_PCLK2_Div6); //72M/6=12,ADC最大时间不能超过14M
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 =DISABLE; //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,使用软件触发
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //ADC数据右对齐
ADC_InitStructure.ADC_NbrOfChannel = 1; //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
ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 1, ADC_SampleTime_239Cycles5 );//Tconv = 采样时间 + 12.5 个周期,239.5.5+12.5 = 252个周期,252*(1/12000 000)= 21us
ADC_DMACmd(ADC1,ENABLE);
ADC_Cmd(ADC1,ENABLE);
ADC_ResetCalibration(ADC1); //复位校准
while(ADC_GetResetCalibrationStatus(ADC1));
ADC_StartCalibration(ADC1); //开始校准
while(ADC_GetCalibrationStatus(ADC1));
ADC_SoftwareStartConvCmd(ADC1,ENABLE); //软件触发开始转换
}
void ADCx_DMA_Init()
{
NVIC_InitTypeDef NVIC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //使能DMA时钟
DMA_DeInit(DMA1_Channel1); //将DMA的通道1寄存器重设为缺省值
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR; //DMA外设ADC基地址
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)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 = 500; //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_Normal; //DMA_Mode_Normal工作在单次模式,只打10个 ;DMA_Mode_Circular,工作在循环缓存模式,不断连续多次打10个
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
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn; //DMA1的通道1优先级配置
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
DMA_ITConfig(DMA1_Channel1,DMA_IT_TC,ENABLE);//开启传输完成中断
DMA_Cmd(DMA1_Channel1,ENABLE); //DMA使能
}
void DMA1_Channel1_IRQHandler(void)
{
if(DMA_GetFlagStatus(DMA1_FLAG_TC1)==SET)
{
printf("进入DMA发送中断!\r\n");
flag=1;
DMA_ClearFlag(DMA1_FLAG_TC1);//清中断标志,否则会一直中断
}
}
void ADCx_All_Init()
{
ADCx_GPIO_Init();
ADCx_Base_Init();
ADCx_DMA_Init();
}
adc.h
#ifndef _adc_H
#define _adc_H
#include "system.h"
extern u8 flag;
extern volatile u16 AD_Value[500];
void ADCx_All_Init(void);
#endif
main.c
#include "system.h"
#include "SysTick.h"
#include "led.h"
#include "usart.h"
#include "adc.h"
#include "zsign.h"
int main()
{
int i=0;
float ADC_Vol;
SysTick_Init(72);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //中断优先级分组 分2组
USART1_Init(9600);
Sign_Init(100);
ADCx_All_Init();
printf("开始");
while(1)
{
if(flag)
{
for(i=0;i<500;i++)
{
printf("- %d -",AD_Value[i]);
ADC_Vol =(float) AD_Value[i]/4096*3.3;
printf("=%.2f",ADC_Vol);
}
i=0;
flag=0;
}
}
}
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