1602_main.c

atmega32 +1602显示+ key控制 + ad转化电路都在一起测试通过

#include <iom16v.h>
#include "1602.h"
//void delay_ms(unsigned int us);
//void delay_us(unsigned int uu);
unsigned char key_read(void);
unsigned char get_key(void);
unsigned int get_ad(void);
unsigned char lcd_process(void);
int key,disp_num1;
float disp_num2;
/*
void delay_us(unsigned int uu)  //90us
 {unsigned int ii; 
  for(ii=0;ii<uu;ii++)
   ;  
  }


void delay_ms(unsigned int us)   //1ms
 {unsigned int ii; 
  for(ii=0;ii<us;ii++)
   delay_us(100);  
  } 
*/
/*
键盘扫描函数
 读取当前键盘的状态
 有按键按下返回相应按键值
 无按键按下返回"0x00"
*/
unsigned char key_read(void){
 unsigned char k;
 


 //非常经典的键盘控制例子
 DDRD = 0x00;/*获取列地址*/   
 PORTD = 0x0F;
 DDRD = 0xF0;
 delay_ms(10);
 k = PIND;
 
 DDRD = 0x00;/*获取行地址*/
 PORTD = 0xF0;
 DDRD = 0x0F;
 delay_ms(10);
 k |= PIND;
 
 DDRD = 0x00;/*输出复位*/
 PORTD = 0xFF;
 
 
 switch (k) {/*将按键码转换成键值*/
//  case  0x00: return 0x00;
  case  0xEE: return 1;
  case  0xDE: return 2;
  case  0xBE: return 3;
  case  0x7E: return 4;
  case  0xED: return 5;
  case  0xDD: return 6;
  case  0xBD: return 7;
  case  0x7D: return 8;
  case  0xEB: return 9;
  case  0xDB: return 44;
  case  0xBB: return 55;
  case  0x7B: return 66;
  case  0xE7: return 77;
  case  0xD7: return 88;
  case  0xB7: return 99;
  case  0x77: return 100;
  default : return 0x00;
  } 
}

/*
按键获取函数
 获取按键信号，其中包含有状态记录及按键去颤抖。
 有正确按键按下返回相应按键值
 无正确按键按下返回"0x00"
*/
unsigned char get_key(void){
 unsigned char i;
 static unsigned char j;/*按键记录*/
 i = key_read();
 if (i == 0x00){/*无有效按键按下*/
  j = 0x00;/*清除按键记录*/
  return 0x00;/*程序退出*/
  }
 if (j == 0x00) {/*为新按键*/
  j = i;/*保存本次采样结果*/
  delay_ms(10);/*去按键颤抖*/
  i = key_read();
  if(i == j) {
   return i;
   }
  }
 return 0x00;
}


/*ADC采样函数，采样第7通道信号，采样分辨率256*/
 unsigned int get_ad(void) {         //3.69KHZ
 unsigned char hh,ll;
 unsigned int num=0;
// _CLI();
  asm("cli");
  DDRA = 0x00;    /*方向输入*/
  PORTA = 0x7F;    /*打开上拉*/
//  delay_us(1);    //10us

 
 ADMUX = 0x47;   /*基准AVCC、10位、通道7*/
 ADCSRA = 0xC0;   /*使能、开启、4分频*/
 while(!(ADCSRA & (1 << ADIF))); /*等待*/
 ll=ADCL;
 num = ADCH;
 num=num*256+ll;
 ADCSRA &= ~(1 << ADIF);  /*清标志*/
 ADCSRA &= ~(1 << ADEN);  /*关闭转换*/
 
 DDRA=0XFF;
 PORTA=0X00;
 //SEI();
  asm("sei");
 return  num;
 
}

unsigned char lcd_process(void)
{

  if( disp_num2<=3.3&&disp_num2>=1)
  {
  LCD_write_char(1,0,'U');
  LCD_write_char(2,0,'=');
  LCD_write_num(3,0,(disp_num2*100)/100);
  LCD_write_char(4,0,'.');
  LCD_write_num(5,0,(int)(disp_num2*10)%10);
  LCD_write_num(6,0,(int)(disp_num2*100)%10);
  LCD_write_char(7,0,'V');
 
  }
  else if( disp_num2<1&&disp_num2>=0.1)
  {
  LCD_write_char(1,0,'U');
  LCD_write_char(2,0,'=');
  LCD_write_num(3,0,0);
  LCD_write_char(4,0,'.');
  LCD_write_num(5,0,(disp_num2*100)/10);
  LCD_write_num(6,0,(int)(disp_num2*100)%10);
  LCD_write_char(7,0,'V');
  }
  else if( disp_num2<0.1)
  {
  LCD_write_char(1,0,'U');
  LCD_write_char(2,0,'=');
  LCD_write_num(3,0,0);
  LCD_write_char(4,0,'.');
  LCD_write_num(5,0,0);
  LCD_write_num(6,0,(disp_num2*100)/10);
  LCD_write_char(7,0,'V');
 } 
 }
void main(void) {
 unsigned char i;
 unsigned char *p;
 int time_s;
 PORTB = 0xFF;    /*电平设置*/
 DDRB = 0xFF;    /*方向输出*/
 
 PORTA = 0xFF;
 DDRA = 0xFF;
 delay_ms(100);
 
 LCD_init();
 

time_s=0;

  delay_ms(500);
LCD_clear();	
	while (1) {
	 key=get_key();
	

switch(key)
{ 
  case 1:
   time_s=1;
    LCD_clear();	
   LCD_write_str(6,6,"start...");
   delay_ms(500);
    LCD_clear();	
   disp_num1=get_ad();
   disp_num2=disp_num1*0.00322;
   lcd_process();

   
   break;
  
  case 2:
   time_s=2;
   LCD_clear();	
   LCD_write_str(4,4,"over...");
   delay_ms(500);
   LCD_clear();	
   break; 
   
   case 3:
   time_s=3;
   break;
  case 4:
   time_s=4;
   break; 
 case 5:
   time_s=5;
   break;
  
  case 6:
   time_s=6;
   break; 
   
   case 7:
   time_s=7;
   break;
  case 8:
   time_s=8;
   break;   
   case 9:
   time_s=9;
   break;  
  } 
  







  }
}