#include <stdio.h>
#include <reg51.h>
#include <irq52.h>
#include <string.h>

void DelayT0(unsigned long count);						//delay "10" 10us


void WriteData(unsigned char cData);						//datem am lcd
void WriteInstr(unsigned char cInstr);						//befehl an lcd
void DisplayBusy(void);							//busy flag lcd abfragen
void InitLcd(void);								//lcd initialisieren
void WriteLine(unsigned char *text,unsigned char cursor);				//schreiben einer ganzen linie

void ReadAD(void);								//spannungswerte lesen
void ReadADS(void);											//strom werte lesen

void ShowCounts(float ergebnis);						//anzeige auf display
void display(float val, uchar *ptr );						//float to asci


//***************lcd ports****************

#define LCDPORT P2

#define ENA		P1_B0											//enable lcd
#define RW		P1_B1											//schreiben oder lesen lcd
#define RS		P1_B2											//befehl senden oder lesen lcd

#define BF		P2_B7


//*****************da ports**************

//spannung
#define DATA	P0_B7
#define CLK		P0_B6
#define CS		P0_B5

//strom
#define DATAS	P0_B1
#define	CLKS	P0_B3
#define CSS		P0_B0

//*****************encoder****************
#define ENC		P1_B6

//lcd variablen**************************

#define clear_LCD		0x01
#define home_LCD		0x02
#define set_LCD			0x38
#define LCD_off			0x0E
#define entry_mode		0x06		
#define cursor_off		0x0C
#define cursor_blink	0x0F


#define EZeile		0x80						//1.Zeile anfang
#define ZZeile		0xC0						//2.Zeile anfang




//lcd text*****************************************


code char welcome1[]="Test Programm   ";
code char welcome2[]="                ";
code char leer[]	="                ";

near char buf[]		= "";						//buffer für int zahl ins ram speichern;	
near char ComChar[] = "";
near float AnalogBuf=0;							//buffer für analogwert wandlerspannung
near unsigned char encoder_l;
near unsigned char encoder_r;
near unsigned int zaehler=100;



IRQ_VECTOR(ext_int5,IRQ_INT5)

void ext_int5 (void) interrupt  {
	
	

	EA = 0;
	EX5 = 0;								//interrupt 5 sperren
	EXIF &= 15;							//lösche alle interrupt flags 	
	
	encoder_l=0;							//flags löschen
	encoder_r=0;
											
		DelayT0(60);						//entprellen 2ms			
		if(ENC == 1)						//drehrichtung festellen
			zaehler +=1;
		if(ENC == 0)
			zaehler -=1;
			
}





void main(void)
{
	
	
	unsigned char i;
	unsigned char az_zeichen;
 


  EA   = 0;	
  
  PCON|=128;	// Baudrate double
  SCON = 126;	// 8 Bit UART - PC-compatible, TI-FLAG set!
  TH1=256-(XTAL/(192L*BAUDRATE));	// Calculate baudrate divisor
  TMOD=32;	// use timer 1 as baudrate generator
  TCON=64;	// dto.	


  // Init Timer0 (assume UART initialised by startup code)
  TMOD &= 0xF0;  // TMOD Timer 0: 8 bit counter
  TMOD |= 0x02;	 // 8 Bit Reload Mode
  TH0 = 6;	 // FRQ is XTAL/3000 : 11.0592 MHz: 3.6864 kHz
 

  								

	DelayT0(10000);						 //warten bis alle spannung stabil sind
	
	InitLcd();
	WriteInstr(0x0C);						//cursor off;
	
	WriteLine(welcome1,EZeile);					//begrüssungstext
	WriteLine(welcome2,ZZeile);
	DelayT0(50000);
	
	EA   = 1;
	EX5 = 1;

  for(;;){
	

	ReadAD();

	printf("%fA",AnalogBuf);
	
	
	az_zeichen=sprintf(buf,"%d",zaehler);				//int to string
	WriteInstr(0xC0);
	for(i=0;i< az_zeichen;i++){
		WriteData(buf[i]);
	}
	
	EA = 1;
	EX5=1;							//interrupt freigeben				
	DelayT0(1000);
  }
}