systemcga.h File Reference

Go to the source code of this file.

Data Structures
struct	SYSTEM_CGA_CONTROL
Defines
#define	SYSTEM_CGA_ADDRESS_PORT   0x3d4
#define	SYSTEM_CGA_DATA_PORT   0x3d5
#define	SYSTEM_CGA_HTR   0x00
#define	SYSTEM_CGA_EHDR   0x01
#define	SYSTEM_CGA_SHBR   0x02
#define	SYSTEM_CGA_EHBR   0x03
#define	SYSTEM_CGA_SHRR   0x04
#define	SYSTEM_CGA_EHRR   0x05
#define	SYSTEM_CGA_VTR   0x06
#define	SYSTEM_CGA_OR   0x07
#define	SYSTEM_CGA_PRSR   0x08
#define	SYSTEM_CGA_MSLR   0x09
#define	SYSTEM_CGA_CSR   0x0a
#define	SYSTEM_CGA_CER   0x0b
#define	SYSTEM_CGA_SAHR   0x0c
#define	SYSTEM_CGA_SALR   0x0d
#define	SYSTEM_CGA_CLHR   0x0e
#define	SYSTEM_CGA_CLLR   0x0f
#define	SYSTEM_CGA_VRSR   0x10
#define	SYSTEM_CGA_VRER   0x11
#define	SYSTEM_CGA_VDER   0x12
#define	SYSTEM_CGA_OR   0x13
#define	SYSTEM_CGA_ULR   0x14
#define	SYSTEM_CGA_SVBR   0x15
#define	SYSTEM_CGA_EVB   0x16
#define	SYSTEM_CGA_CMCR   0x17
#define	SYSTEM_CGA_LCR   0x18
Functions
void	SystemCgaInit ()
void	SystemCgaCursorSet ()
void	SystemCgaScrollUp ()
void	SystemCgaCharPut (U8 CharValue)
void	SystemCgaScreenClean ()
void	SystemCgaBackSpace ()
void	SystemCgaChangeLine ()
Variables
SYSTEM_CGA_CONTROL	SystemCgaCtrl

---

Define Documentation

#define SYSTEM_CGA_ADDRESS_PORT   0x3d4

Definition at line 4 of file systemcga.h.

#define SYSTEM_CGA_CER   0x0b

Definition at line 18 of file systemcga.h.

#define SYSTEM_CGA_CLHR   0x0e

Definition at line 21 of file systemcga.h.

#define SYSTEM_CGA_CLLR   0x0f

Definition at line 22 of file systemcga.h.

#define SYSTEM_CGA_CMCR   0x17

Definition at line 30 of file systemcga.h.

#define SYSTEM_CGA_CSR   0x0a

Definition at line 17 of file systemcga.h.

#define SYSTEM_CGA_DATA_PORT   0x3d5

Definition at line 5 of file systemcga.h.

#define SYSTEM_CGA_EHBR   0x03

Definition at line 10 of file systemcga.h.

#define SYSTEM_CGA_EHDR   0x01

Definition at line 8 of file systemcga.h.

#define SYSTEM_CGA_EHRR   0x05

Definition at line 12 of file systemcga.h.

#define SYSTEM_CGA_EVB   0x16

Definition at line 29 of file systemcga.h.

#define SYSTEM_CGA_HTR   0x00

Definition at line 7 of file systemcga.h.

#define SYSTEM_CGA_LCR   0x18

Definition at line 31 of file systemcga.h.

#define SYSTEM_CGA_MSLR   0x09

Definition at line 16 of file systemcga.h.

#define SYSTEM_CGA_OR   0x13

Definition at line 26 of file systemcga.h.

#define SYSTEM_CGA_OR   0x07

Definition at line 26 of file systemcga.h.

#define SYSTEM_CGA_PRSR   0x08

Definition at line 15 of file systemcga.h.

#define SYSTEM_CGA_SAHR   0x0c

Definition at line 19 of file systemcga.h.

#define SYSTEM_CGA_SALR   0x0d

Definition at line 20 of file systemcga.h.

#define SYSTEM_CGA_SHBR   0x02

Definition at line 9 of file systemcga.h.

#define SYSTEM_CGA_SHRR   0x04

Definition at line 11 of file systemcga.h.

#define SYSTEM_CGA_SVBR   0x15

Definition at line 28 of file systemcga.h.

#define SYSTEM_CGA_ULR   0x14

Definition at line 27 of file systemcga.h.

#define SYSTEM_CGA_VDER   0x12

Definition at line 25 of file systemcga.h.

#define SYSTEM_CGA_VRER   0x11

Definition at line 24 of file systemcga.h.

#define SYSTEM_CGA_VRSR   0x10

Definition at line 23 of file systemcga.h.

#define SYSTEM_CGA_VTR   0x06

Definition at line 13 of file systemcga.h.

---

Function Documentation

void SystemCgaBackSpace

(

)

void SystemCgaChangeLine

(

)

Definition at line 69 of file systemcga.c.

                              {
    U8 i;
    
    i=0;
    while(SystemCgaCtrl.CursorPosition>160){
        SystemCgaCtrl.CursorPosition=SystemCgaCtrl.CursorPosition-160;
        i++;    
    }
    SystemCgaCtrl.CursorPosition=(i+1)*160;
    if(SystemCgaCtrl.CursorPosition==4000) SystemCgaScrollUp(); 
}

void SystemCgaCharPut

(

U8

CharValue

)

Definition at line 47 of file systemcga.c.

                                   {
    if((CharValue>=0x20)&&(CharValue<=0x7e)){
         SystemCgaByteWrite(SystemCgaCtrl.CursorPosition++,CharValue);
         SystemCgaByteWrite(SystemCgaCtrl.CursorPosition++,SystemCgaCtrl.CharacterAttribute);
    }
    else{
         SystemCgaByteWrite(SystemCgaCtrl.CursorPosition++,'?');
         SystemCgaByteWrite(SystemCgaCtrl.CursorPosition++,SystemCgaCtrl.CharacterAttribute);
    }
    if(SystemCgaCtrl.CursorPosition==4000) SystemCgaScrollUp();
}

void SystemCgaCursorSet

(

)

Definition at line 25 of file systemcga.c.

                             {
    OutByte(SYSTEM_CGA_ADDRESS_PORT,SYSTEM_CGA_CLLR);
    OutByte(SYSTEM_CGA_DATA_PORT,((SystemCgaCtrl.CursorPosition/2)&0xff));
    OutByte(SYSTEM_CGA_ADDRESS_PORT,SYSTEM_CGA_CLHR);
    OutByte(SYSTEM_CGA_DATA_PORT,(((SystemCgaCtrl.CursorPosition/2)>>8)&0xff));
}

void SystemCgaInit

(

)

Definition at line 14 of file systemcga.c.

                        {
    SystemCgaCtrl.CursorPosition=0;
    SystemCgaCtrl.CharacterAttribute=0x1F;
    SystemCgaScreenClean();
    SystemCgaCtrl.CharacterAttribute=0x0F;
    OutByte(SYSTEM_CGA_ADDRESS_PORT,SYSTEM_CGA_CLLR);
    OutByte(SYSTEM_CGA_DATA_PORT,((SystemCgaCtrl.CursorPosition/2)&0xff));
    OutByte(SYSTEM_CGA_ADDRESS_PORT,SYSTEM_CGA_CLHR);
    OutByte(SYSTEM_CGA_DATA_PORT,(((SystemCgaCtrl.CursorPosition/2)>>8)&0xff));
}

void SystemCgaScreenClean

(

)

Definition at line 59 of file systemcga.c.

                               {
    U32 i;
    
    for(i=0;i<4000;i=i+2){
        SystemCgaByteWrite(i,' ');
        SystemCgaByteWrite(i+1,SystemCgaCtrl.CharacterAttribute);
    }
    SystemCgaCtrl.CursorPosition=0;
}

void SystemCgaScrollUp

(

)

Definition at line 32 of file systemcga.c.

                            {
    U32 i;
    U8 ByteValue;
    
    for(i=0;i<3840;i++){
        ByteValue=SystemCgaByteRead(i+160);
        SystemCgaByteWrite(i,ByteValue);
    }
    for(i=3840;i<4000;i=i+2){
        SystemCgaByteWrite(i,' ');
        SystemCgaByteWrite(i+1,SystemCgaCtrl.CharacterAttribute);
    }
    SystemCgaCtrl.CursorPosition=3840;
}

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Variable Documentation

SYSTEM_CGA_CONTROL SystemCgaCtrl

Definition at line 12 of file systemcga.c.