// leeters address in the eeprom

// 74c595 pins
#define shiftp PORTb.F7
#define latchp PORTb.F6
#define dc PORTb.F5
//74hc595 functinon
#define latch latchp=1;latchp=0;
#define shift shiftp=1;shiftp=0;
//74hc164 functinon
#define ser porta.f6
#define clk     porta.f7=1;porta.f7=0;
//some leds
#define led1 porta.f0
#define led2 porta.f1
//delay<s> :::
#define del  delay_us(1);
//------------------------------------------------------------------------------
sbit Soft_I2C_Scl           at Ra2_bit;
sbit Soft_I2C_Sda           at Ra3_bit;
sbit Soft_I2C_Scl_Direction at TRISa2_bit;
sbit Soft_I2C_Sda_Direction at TRISa3_bit;

//------------------------------------------------------------------------------
unsigned char symbol,symbol2,symbol_1=32;
unsigned char ch[64],txt[5];
unsigned char addres,i2c_addres;
unsigned char eow;                     //end of the wtiteing
unsigned char speed;                  //scrolling speed
unsigned char bs;                    //buffer size

unsigned char arabic_e_letters=0;
//scrollingmode = 0 = from the left to the right (for the english words)
//scrollingmode = 1 = from the right to the left  (for the arabic words)



//------------------------------------------------------------------------------
 //senfing data to the 47hc595
void send(unsigned char _shiftdata){
unsigned char i=8;

while (i>0){
if (_shiftdata.F7==0)  {dc = 1;}
else                   {dc = 0;}
_shiftdata = _shiftdata<<1;
shift;
i--;        }  //while
}//send595
//------------------------------------------------------------------------------
void column_num(char cn ){
ser=0;

for(eow=0;eow<64;eow++){clk;}

ser=1;clk;ser=0;
while(cn>0)    {clk;
cn--;}
}

//------------------------------------------------------------------------------
void get_ch(){char llk=0xa0,temp,lc,fl=0;
unsigned char med;
if(symbol>'*'&&arabic_e_letters==0){
 med=symbol;med=med-65;if(symbol>=91){fl=1;med=med+64;}; i2c_addres=med*8;llk=0xa2 ;}// if page 1
 
if(symbol<='*'&&arabic_e_letters==0){med=symbol;med=med-32; i2c_addres=med*8;llk=0xa0 ;}// if page 0



if(arabic_e_letters==1){
if(symbol_1=='v'||symbol_1==']'||symbol_1=='`'||symbol_1=='.'||symbol_1==','||symbol_1=='_'||symbol_1=='*'||symbol_1=='^'){symbol_1=32;}
 if(symbol2=='_'||symbol2=='*'||symbol2=='^'){symbol2=32;};
switch (symbol) {
   case 32:if(addres>4){arabic_e_letters=0;}break;
   case '_':i2c_addres=0;llk=0xa0;break;
//-----------------------
case 'h':i2c_addres=16;llk=0xa4;break;   //alef

case 'f':if(symbol2==32){i2c_addres=32;llk=0xa4;}
else{i2c_addres=24;llk=0xa4;}break;


case 'j': i2c_addres=40;llk=0xa4;if(symbol2==32){i2c_addres=48;llk=0xa4;} break;;


case 'e':i2c_addres=56;llk=0xa4;if(symbol2==32){addres=64;llk=0xa4;}break;;


case '[':i2c_addres=72;llk=0xa4;if(symbol2==32){i2c_addres=80;llk=0xa4;} break;;

                         
case 'p':i2c_addres=88;llk=0xa4;if(symbol2==32){i2c_addres=96;llk=0xa4;} break;;


case 'o':i2c_addres=104;llk=0xa4;if(symbol2==32){i2c_addres=112;llk=0xa4;}break;;


case ']':i2c_addres=120;llk=0xa4;break;;

case '`':i2c_addres=128;llk=0xa4;break;

case 'v':i2c_addres=136;llk=0xa4;break;;

case '.':i2c_addres=144;llk=0xa4;break;;

case 's':
i2c_addres=152;llk=0xa4;
if(symbol2==32){i2c_addres=160;llk=0xa4;} break;


case 'a':i2c_addres=168;llk=0xa4;
if(symbol2==32){i2c_addres=176;llk=0xa4;} break;


case 'w':i2c_addres=184;llk=0xa4;
if(symbol2==32){i2c_addres=192;llk=0xa4;}break;


case 'q':i2c_addres=200;llk=0xa4;
if(symbol2==32){i2c_addres=208;llk=0xa4;}   break;


case 39: i2c_addres=216;llk=0xa4;break;;//  '

case '/':i2c_addres=224;llk=0xa4;break;;

case 'u':if(symbol_1==32){i2c_addres=232;llk=0xa4;}
else if(symbol2==32){i2c_addres=248;llk=0xa4;}
else{i2c_addres=240;llk=0xa4;}break;

case 'y':if(symbol2==32){i2c_addres=0;llk=0xa6;}
        if(symbol_1==32){i2c_addres=8;llk=0xa0;}
                    else{i2c_addres=0;llk=0xa0;}break;

case 't':i2c_addres=8;llk=0xa6;
if(symbol2==32){i2c_addres=16;llk=0xa6;}break;;


case 'r':i2c_addres=24;llk=0xa6;
if(symbol2==32){i2c_addres=32;llk=0xa6;}   break;



case ';': i2c_addres=40;llk=0xa6;
if(symbol2==32){i2c_addres=48;llk=0xa6;} break;

                         
case 'g':i2c_addres=56;llk=0xa6;
if(symbol2==32){i2c_addres=64;llk=0xa6;} break;

                         
case 'l':
i2c_addres=80;llk=0xa6;
if(symbol_1==32&&symbol2!=32){i2c_addres=152;llk=0xa6;}
if(symbol_1!=32&&symbol2!=32){i2c_addres=72 ;llk=0xa6;}
break;

                         
case 'k': i2c_addres=88;llk=0xa6;
if(symbol2==32){i2c_addres=96;llk=0xa6;} break;

                         
case 'i':
if(symbol_1==32&&symbol2==32){i2c_addres=144;llk=0xa6;}
if(symbol_1!=32&&symbol2==32){i2c_addres=112;llk=0xa6;}
if(symbol_1!=32&&symbol2!=32){i2c_addres=104;llk=0xa6;}
 break;

case 'm':
if(symbol_1==32&&symbol2==32){i2c_addres=144;llk=0xa6;}
if(symbol_1!=32&&symbol2==32){i2c_addres=112;llk=0xa6;}
if(symbol_1!=32&&symbol2!=32){i2c_addres=104;llk=0xa6;}
 break;
                         
case ',':i2c_addres=120;llk=0xa6;break;
                         
case 'd':i2c_addres=128;llk=0xa6;if(symbol2==32){i2c_addres=136;llk=0xa6;} break;


                         
}//end of case
}//end if id arabic_englis

if(symbol=='3'&&symbol2=='>'){i2c_addres=160;llk=0xa6;}
//DUME WRITE
Soft_I2C_Start();          //start signal
Soft_I2C_Write(llk);      //device addres
Soft_I2C_Write(i2c_addres);//start froma adress 0 to write

//real read
Soft_I2C_Start();//start signal
Soft_I2C_Write(llk+1);//eeprom adress  page (adress)

for(lc=0;lc<8;lc++){
ch[lc]=Soft_I2C_Read(1); }
Soft_I2C_Read(0);

Soft_I2C_Stop();

if(fl==1){
for(lc=0;lc<8;lc++){
temp=ch[lc];
ch[lc].f7=temp.f0;
ch[lc].f6=temp.f1;
ch[lc].f5=temp.f2;
ch[lc].f4=temp.f3;
ch[lc].f3=temp.f4;
ch[lc].f2=temp.f5;
ch[lc].f1=temp.f6;
ch[lc].f0=temp.f7;
} fl=0;
}
}//get_ch
//------------------------------------------------------------------------------
//main
void main(){
char x,z,fre,s;
cmcon=0x07;
trisa.f0=0;trisa.f1=0;
trisa.f4=1;trisa.f6=0;
trisa.f7=0;

trisb.f0=0;trisb.f1=1;
trisb.f2=0;trisb.f3=0;
trisb.f4=0;trisb.f5=0;
trisb.f6=0;trisb.f7=0;

//init uart
UART1_Init(9600);
delay_ms(100);
UART1_Write(0x0d);
//get hc595 ready
send(255);latch;
//get leds ready
led1=0;led2=0;

addres=0;
UART1_Write('r');
UART1_Write(0x0d);
UART1_Write_Text("the screen is ready ");
UART1_Write(0x0d);
delay_ms(100);
//get buffer size
UART1_Write_Text( "input how many units : ");
UART1_Write(0x0d);
while(UART1_Data_Ready()==0){;}UART1_Write(0x0d);
bs=UART1_Read();
bs=bs*8+16;
//get scrrolling speed
UART1_Write_Text("input speed : ");
UART1_Write(0x0d);
delay_ms(100);
while(UART1_Data_Ready()==0){;} UART1_Write(0x0d);
speed=UART1_Read();
speed=speed-47;
UART1_Write_Text("input words: ");
UART1_Write(0x0d);

//receive words & store it in the internal eeprom
if(porta.f4==0){goto len;};
for(;;){
led1=0;
while(UART1_Data_Ready()==0){;}
 led1=1;delay_ms(100);
 fre= UART1_Read();
 if(fre==0x0d){goto len;}
 EEPROM_Write(addres,fre);
 addres++;
 eow=addres;
   EEPROM_Write(127,1);
        }

len:
delay_ms(100);
led2=1;led1=0;
addres=0;
//-------------------------
loop:
//getting symbol
symbol=EEPROM_Read(addres);
delay_ms(5);
symbol2=EEPROM_Read(addres+1);
if(symbol2==0xff){symbol2=32;}
if(addres>0){symbol_1=EEPROM_Read(addres-1);}
if(symbol_1=='*'){symbol_1=32;}
if(addres>eow){symbol=32;};
if(symbol==0xff){symbol=32;};
if(arabic_e_letters==0){
if(symbol=='*'&&symbol2=='*'){symbol_1=32;symbol2=32;arabic_e_letters=1;addres++;addres++;goto loop;} ;}


UART1_Write(symbol);
//------------------------------------------------------------------------------
get_ch();
for(z=0;z<8;z++){
s=speed;
while(s>0){
for(x=0;x<64;x++){

send(ch[x]);
latch;symbol=symbol-32;
send(0);
latch;
column_num(x);

};
s--;
} //while




for(x=63;x>0;x--){ch[x]=ch[x-1];}   //move to right




} // for z
addres++;
goto loop;
;}

void main(){
char x,z,fre,s;
cmcon=0x07;
trisa.f0=0;trisa.f1=0;
trisa.f4=1;trisa.f6=0;
trisa.f7=0;

trisb.f0=0;trisb.f1=1;
trisb.f2=0;trisb.f3=0;
trisb.f4=0;trisb.f5=0;
trisb.f6=0;trisb.f7=0;

//init uart
UART1_Init(9600);
delay_ms(100);
UART1_Write(0x0d);
//get hc595 ready
send(255);latch;
//get leds ready
led1=0;led2=0;

addres=0;
UART1_Write('r');
UART1_Write(0x0d);
UART1_Write_Text("the screen is ready ");
UART1_Write(0x0d);
delay_ms(100);
//get buffer size
UART1_Write_Text( "input how many units : ");
UART1_Write(0x0d);
while(UART1_Data_Ready()==0){;}UART1_Write(0x0d);
bs=UART1_Read();
bs=bs*8+16;
//get scrrolling speed
UART1_Write_Text("input speed : ");
UART1_Write(0x0d);
delay_ms(100);
while(UART1_Data_Ready()==0){;} UART1_Write(0x0d);
speed=UART1_Read();
speed=speed-47;