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程序清单：

//stm32开发板源程序#include "DAC7611.h"

#include "delay.h"

#include "key.h"

#include "sys.h"

#include "lcd.h"

#include "usart.h"   

#include "usmart.h"

int main(void)

 {   

u8 key;

u16 adcx;

float temp;

u8 t=0; 

u16 dacval=0;

delay_init();    

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

uart_init(115200); 

KEY_Init(); 

LCD_Init();   

usmart_dev.init(72);

DAC7611_Init();

LCD_Fill(0,0,240,320,WHITE);

POINT_COLOR=BLUE;

while(1)

{

LCD_ShowString(60,90,200,16,16," Signal Group ");

LCD_ShowString(60,110,200,16,16,"  212EDA@Ujs ");

LCD_ShowString(60,130,200,16,16,"      2015/8 ");

key=KEY_Scan(0);

if(key == KEY0_PRES||key == KEY1_PRES||key == KEY2_PRES||key == KEY3_PRES||key == KEY4_PRES)

break;

}

LCD_Clear(WHITE);

POINT_COLOR=GREEN;

LCD_ShowString(60,90,200,16,16," DAC TEST ");

POINT_COLOR=BLUE;

// LCD_ShowString(60,150,200,16,16,"DAC VAL:");     

LCD_ShowString(60,170,200,16,16,"DAC VOL:0.000V");     

DAC7611_Cnv(dacval);      

while(1)

{

t++;

key=KEY_Scan(0);  

if(key==KEY0_PRES)

{ 

if(dacval<4096)

dacval+=10;

else

dacval=0;

}

else if(key==KEY1_PRES)

{

if(dacval>10)

dacval-=10;

else

dacval=4096;

}

else if(key==KEY2_PRES)

{

if(dacval<4096)

dacval+=200;

else

dacval=0;

}

else if(key==KEY3_PRES)

{

if(dacval>200)

dacval-=200;

else

dacval=4096;

}

else if(key==KEY4_PRES)

{

dacval=0;

}

DAC7611_Cnv(dacval);

 if(t==10)

{  

adcx=dacval;

temp=(float)adcx*(4.096/4096);

adcx=temp;

  LCD_ShowxNum(124,170,temp,1,16,0);    

  temp-=adcx;

temp*=1000;

LCD_ShowxNum(140,170,temp,3,16,0X80); 

t=0;

}    

delay_ms(10);

}

}