（28）STM32——DAC数模转换笔记

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);//使能 GPIOA 时钟
 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;//模拟输入
 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;//下拉
 GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化

 RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);//使能 DAC 时钟

 void DAC_Init(uint32_t DAC_Channel, DAC_InitTypeDef* DAC_InitStruct);

 DAC_Cmd(DAC_Channel_1, ENABLE); //使能 DAC 通道 1

  DAC_SetChannel1Data(DAC_Align_12b_R, 0); //12 位右对齐数据格式设置 DAC 值
 

#include "dac.h"
 

//DAC通道1输出初始化
void Dac1_Init(void)
{  
	GPIO_InitTypeDef  GPIO_InitStructure;
	DAC_InitTypeDef  DAC_InitType;
	
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);//使能GPIOA时钟
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);//使能DAC时钟
	   
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;//模拟输入
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;//下拉
	GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化

	DAC_InitType.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bit0;//屏蔽、幅值设置
	DAC_InitType.DAC_OutputBuffer = DAC_OutputBuffer_Disable; //DAC1输出缓存关闭 
	DAC_InitType.DAC_Trigger = DAC_Trigger_None;//不使用触发功能
	DAC_InitType.DAC_WaveGeneration = DAC_WaveGeneration_None;//不使用波形发生
	DAC_Init(DAC_Channel_1,&DAC_InitType);	 //初始化DAC通道1

	DAC_Cmd(DAC_Channel_1, ENABLE);  //使能DAC通道1
  
	DAC_SetChannel1Data(DAC_Align_12b_R, 0);  //12位右对齐数据格式设置DAC值
}

#include "sys.h"
#include "delay.h"
#include "usart.h"
#include "led.h"
#include "adc.h"
#include "dac.h"
#include "key.h"

int main(void)
{ 
	u16 adcx;
	float temp;
 	u8 t=0;	 
	u16 dacval=0;
	u8 key;	
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//设置系统中断优先级分组2
	delay_init(168);      //初始化延时函数
	uart_init(115200);		//初始化串口波特率为115200	
	LED_Init();					//初始化LED 
	Adc_Init(); 				//adc初始化
	KEY_Init(); 				//按键初始化
	Dac1_Init();		 		//DAC通道1初始化		     	 	
  DAC_SetChannel1Data(DAC_Align_12b_R,dacval);//初始值为0	
	while(1)
	{
		t++;
		key=KEY_Scan(1);			  
		if(key==WKUP_PRES)
		{		 
			if(dacval<4000)dacval+=200;
			DAC_SetChannel1Data(DAC_Align_12b_R, dacval);//设置DAC值
		}else if(key==KEY1_PRES)	
		{
			if(dacval>200)dacval-=200;
			else dacval=0;
			DAC_SetChannel1Data(DAC_Align_12b_R, dacval);//设置DAC值
		}	 
		if(t==100||key==KEY1_PRES||key==WKUP_PRES) 	//WKUP/KEY1按下了,或者定时时间到了
		{	  
 			adcx=DAC_GetDataOutputValue(DAC_Channel_1);//读取前面设置DAC的值
			printf ("DAC VAL:%d",adcx);	  //显示DAC寄存器值    
			printf ("\r\n\r\n");			
			temp=(float)adcx*(3.3/4096);			         //得到DAC电压值
			adcx=temp;
 			printf("DAC VOL:%fV",temp);	      	   //显示电压值
			printf ("\r\n\r\n");
 			adcx=Get_Adc_Average(ADC_Channel_5,10);		//得到ADC转换值	  
			temp=(float)adcx*(3.3/4096);			        //得到ADC电压值
			adcx=temp;
 			printf("ADC VOL:%fV",temp);     	  //显示电压值
			printf ("\r\n\r\n");
			LED0=!LED0;	   
			t=0;
		}	    
		delay_ms(10);	 
	}	
}