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lcd24064.c
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lcd24064.c
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/* ----------------------------------------------------------
* Program to control a T6963C-based 240x64 pixel LCD display
*
*
*
* Written by John P. Beale May 3-4, 1997 beale@best.com
*
* Converted by Nico Sachs Feb. 2006 for AVR-GCC
*
* Based on information from Steve Lawther,
* "Writing Software for T6963C based Graphic LCDs", 1997 which is at
* http://ourworld.compuserve.com/homepages/steve_lawther/t6963c.pdf
*
* and the Toshiba T6963C data sheet, also on Steve's WWW page
*
* and info at: http://www.citilink.com/~jsampson/lcdindex.htm
* http://www.cs.colostate.edu/~hirsch/LCD.html
* http://www.hantronix.com/
* ----------------------------------------------------------
*/
/*
* FG (1) frame ground
* GND (2) ground
* VDD (3) LCD logic supply +5 DC
* VO (4) Contrast
* /WR (5) <-->
* /RD (6) <-->
* /CE or /CS (7) <-->
* CD or RS (8) <-->
* /RST (9) <-->
* D0 (10) <-->
* D1 (11) <-->
* D2 (12) <-->
* D3 (13) <-->
* D4 (14) <-->
* D5 (15) <-->
* D6 (16) <-->
* D7 (17) <-->
* FS (18) font select HI : narrow LOW : Wide ( normal )
40 with 6x8 font 30 with 8x8 font
* Vout (19) Variable Resistor with GND and centre with VO ( Pin 4 )
* BLA (20) Back light +
* BLK (21) Back light -
* DSPON (22) I don't Know but i think means display ON or ...
*/
#define LCD_W PORTE.3
#define LCD_W_DIR DDRE.3
#define LCD_R PORTE.4
#define LCD_R_DIR DDRE.4
#define LCD_CE PORTE.5
#define LCD_CE_DIR DDRE.5
#define LCD_CD PORTE.6
#define LCD_CD_DIR DDRE.6
#define LCD_RST PORTE.7
#define LCD_RST_DIR DDRE.7
/***************************************/
/****************************************/
//**
//**
#define LCD_DATA_PORT PORTF //**
#define LCD_DATA_PIN PINF //**
#define LCD_DATADIR DDRF //**
//**
//**************************************
//**************************************
// ----- Definitions concerning LCD internal memory ------
#define LCD_G_BASE 0x0200 //0x0200 // base address of graphics memory
#define LCD_T_BASE 0x0000 // base address of text memory
#define LCD_BYTES_PER_ROW 30 // how many bytes per row on screen
#define LCD_wr_high() LCD_W=1 //glcd_wr_PORT |= _BV(glcd_wr_PIN);
#define LCD_wr_low() LCD_W=0 //glcd_wr_PORT &= ~_BV(glcd_wr_PIN);
#define LCD_rd_high() LCD_R=1 //glcd_rd_PORT |= _BV(glcd_rd_PIN);
#define LCD_rd_low() LCD_R=0 //glcd_rd_PORT &= ~_BV(glcd_rd_PIN);
#define LCD_ce_high() LCD_CE=1 //glcd_ce_PORT |= _BV(glcd_ce_PIN);
#define LCD_ce_low() LCD_CE=0 //glcd_ce_PORT &= ~_BV(glcd_ce_PIN);
#define LCD_cd_high() LCD_CD=1 //glcd_cd_PORT |= _BV(glcd_cd_PIN);
#define LCD_cd_low() LCD_CD=0 //glcd_cd_PORT &= ~_BV(glcd_cd_PIN);
#define LCD_rst_high() LCD_RST=1 //glcd_rst_PORT |= _BV(glcd_rst_PIN);
#define LCD_rst_low() LCD_RST=0 //glcd_rst_PORT &= ~_BV(glcd_rst_PIN);
#define LCD_SET_DATADIR_OUT() (LCD_DATADIR = 0xFF)
#define LCD_SET_DATADIR_IN() (LCD_DATADIR = 0x00)
unsigned char currentx=0,currenty=0;
#define LCD_XMAX 240 // limits of (x,y) LCD graphics drawing
#define LCD_XMIN 0
#define LCD_YMAX 64 //128
#define LCD_YMIN 0
void LCD_set_address(unsigned int addr){
LCD_dput(addr%256);
LCD_dput(addr>>8);
LCD_cput(0x24);
}
void LCD_set_all_graph() // clear graphics memory of LCD
{
int i;
LCD_set_address(LCD_G_BASE); // addrptr at address G_BASE1
for (i=0;i<1920;i++) { // must be 3840 ????????????????? 5120
LCD_dput(0xFF); LCD_cput(0xc0); // write data, inc ptr.
} // end for(i)
} // end LCD_clear_graph()
void LCD_clear_graph() // clear graphics memory of LCD
{
int i;
LCD_set_address(LCD_G_BASE); // addrptr at address G_BASE1
for (i=0;i<1920;i++) { // must be 3840 ????????????????? 5120
LCD_dput(0); LCD_cput(0xc0); // write data, inc ptr.
} // end for(i)
} // end LCD_clear_graph()
void clear_home_pos(void)
{
int i;
LCD_set_address(LCD_G_BASE+LCD_BYTES_PER_ROW*40); // addrptr at address G_BASE1
for (i=0;i<720;i++) { // must be 3840 ????????????????? 5120
LCD_dput(0); LCD_cput(0xc0); // write data, inc ptr.
} // end for(i)
}
void LCD_clear_area_pos(char x1,char y1,char x2,char y2)
{
int i,j;
for (j=y1;j<y2;j++)
{
LCD_set_address(LCD_G_BASE+LCD_BYTES_PER_ROW*j+x1);
for (i=x1;i<x2;i++)
{
LCD_dput(0);
LCD_cput(0xc0);
}
} // end for(i)
}
//----------------------------------------------------------------
void LCD_clear_text()
{
int i;
LCD_set_address(LCD_T_BASE); // addrptr at address T_BASE1
for (i=0;i<240;i++) { // must be 480 ??????????? 640
LCD_dput(0); LCD_cput(0xc0); // write data, inc ptr.
} // end for(i)
} // LCD_clear_text1()
//-------------------------------------------------------------------------------
//acts like putchar() but shows the character on lcd in current position
void LCD_draw_icon(flash unsigned char *icon,char width,char height){
unsigned int rows,offset,mapping,allbytes,i,j;
unsigned char x,y,temp_currentx,temp_currenty,byte,temp_pc;
char bg;
allbytes = width;
allbytes = allbytes / 8;
if(width % 8)allbytes++;
allbytes = allbytes * height;
temp_currentx=currentx;
temp_currenty=currenty;
j=0;
for(i=0;i<allbytes;i++)
{
byte = *(icon+i); //font_Arial_18_n_bnnn_0_n_char_table[offset+i];
temp_pc=0x80;
while(j<width)
{
if(byte&temp_pc)LCD_setpixel(currentx,currenty); else LCD_clrpixel(currentx,currenty);
currentx++;
temp_pc=temp_pc>>1;
j++;
if(j%8==0)break;
}
if(j%8==0 && j<width)continue;
j=0;
currenty++;
currentx=temp_currentx;
}
currenty=temp_currenty;
currentx=temp_currentx+width;
}
/*
//acts like putchar() but shows the character on lcd in current position
void LCD_putnumber_7seg(char c,char background){
unsigned int rows,offset,width,mapping;
unsigned char x,y,i,j,allbytes,temp_currentx,temp_currenty,byte,temp_pc;
char bg;
bg=(background)?1:0;
mapping = font_7_Segment_18_n_bnnn_0_n_mapping_table[c]; //conver ascii code --> order in table eg. A=10
offset=font_7_Segment_18_n_bnnn_0_n_offset_table[mapping]; //index of 1st Byte of CODE
width=14; //width of code
allbytes = (font_7_Segment_18_n_bnnn_0_n_offset_table[mapping+1]-offset);
temp_currentx=currentx;
temp_currenty=currenty;
j=0;
for(i=0;i<allbytes;i++)
{
byte = font_7_Segment_18_n_bnnn_0_n_char_table[offset+i];
temp_pc=0x80;
while(j<width)
{
if(byte&temp_pc)LCD_setpixel(currentx,currenty); //else LCD_clrpixel(currentx,currenty);
currentx++;
temp_pc=temp_pc>>1;
j++;
if(j%8==0)break;
}
if(j%8==0 && j<width)continue;
j=0;
currenty++;
currentx=temp_currentx;
}
currenty=temp_currenty;
currentx=temp_currentx+width;
} */
//acts like putchar() but shows the character on lcd in current position
void LCD_putnumber_arial(char c,char fontsize){
unsigned int rows,offset,width,mapping;
unsigned char x,y,i,j,allbytes,temp_currentx,temp_currenty,byte,temp_pc;
if(c=='-')mapping=11;
else if(c=='.')mapping=12;
else if(c=='|')mapping=13;
else if(c>='0')mapping=c-'0';
else mapping=10;
if(fontsize==18)
{
offset=mapping*38; //index of 1st Byte of CODE
if(c=='.')width=4;
else if(c=='|')width=1;
else width=13; //width of code
allbytes = 38;
}
else if(fontsize==36)
{
offset=mapping*84; //index of 1st Byte of CODE
if(c=='.')width=6;
else if(c=='|')width=1;
else width=20; //width of code
allbytes = 84;
}
temp_currentx=currentx;
temp_currenty=currenty;
j=0;
for(i=0;i<allbytes;i++)
{
if(fontsize==18)byte = font_Arial_18_n_bnnn_0_n_char_table[offset+i];
else if(fontsize==36)byte = font_Arial_36_n_bnnn_0_n_char_table[offset+i];
temp_pc=0x80;
while(j<width)
{
if(byte&temp_pc)LCD_setpixel(currentx,currenty); else LCD_clrpixel(currentx,currenty);
currentx++;
temp_pc=temp_pc>>1;
j++;
if(j%8==0)break;
}
if(j%8==0 && j<width)continue;
if(j==width && width<8){if(fontsize==18)i++; else i+=2;};
j=0;
currenty++;
currentx=temp_currentx;
}
currenty=temp_currenty;
currentx=temp_currentx+width;
}
void LCD_put_stringnumber_arial(unsigned char *numstr,unsigned char fontsize) //fontsize--> 18 | 36
{
unsigned char temp_lsta=0;
while(*(numstr+temp_lsta))
{LCD_putnumber_arial(*(numstr+temp_lsta),fontsize);
temp_lsta++;}
}
//acts like putchar() but shows the character on lcd in current position
void LCD_puttahoma(unsigned char c,unsigned char font_width)
{
unsigned int rows,offset,width,mapping;
unsigned char x,y,i,j,allbytes,temp_currentx,temp_currenty,byte,temp_pc;
mapping = font_Times_New_Roman_10_n_bnnn_0_n_mapping_table[c];
if(font_width==7 || font_width=='m')
{
offset=mapping*9; //index of 1st Byte of CODE
width=7; //width of code
allbytes = 9;
}
else
if(font_width==8 || font_width=='n') //'n' is same as 8 but is different in background (for NEGATIVE)
{
offset=mapping*11; //index of 1st Byte of CODE
width=8; //width of code
allbytes = 11;
}
temp_currentx=currentx;
temp_currenty=currenty;
//if((mapping<10 || c=='.' || c==' ') && ((font_width==7) || (font_width=='m')))temp_currentx--;
j=0;
for(i=0;i<allbytes;i++)
{
if((font_width==7) || ( font_width=='m'))
{
byte = font_Tahoma7_char_table[offset+i];
}
else
if((font_width==8) || (font_width=='n'))byte = font_Tahoma8_char_table[offset+i];
temp_pc=0x80;
while(j<width)
{
if((font_width!='n') && (font_width!='m'))
{
if(byte&temp_pc)LCD_setpixel(currentx,currenty); else LCD_clrpixel(currentx,currenty);
}
else
{
if(byte&temp_pc)LCD_clrpixel(currentx,currenty); else LCD_setpixel(currentx,currenty);
}
currentx++;
temp_pc=temp_pc>>1;
j++;
if(j%8==0)break;
}
if(j%8==0 && j<width)continue;
j=0;
currenty++;
currentx=temp_currentx;
}
currenty=temp_currenty;
currentx=temp_currentx+width;
if((mapping<10 || c=='.' || c==' ') && ((font_width==7) || (font_width=='m')))currentx--;
}
void LCD_put_string_tahoma(unsigned char *numstr,unsigned char font_width)
{
unsigned char temp_lsta=0;
// if(font_width!=7 && font_width!='n')
while(*(numstr+temp_lsta))
{LCD_puttahoma(*(numstr+temp_lsta),font_width);
temp_lsta++;}
}
unsigned char LCD_get_len_string_tahoma7(unsigned char *numstr)
{
unsigned char temp_gsta=0,temp_gsta2,temp_gsta3=0;
while(*(numstr+temp_gsta))
{
temp_gsta2=*(numstr+temp_gsta);
if(temp_gsta2 == '.' || temp_gsta2 == ' ' || (temp_gsta2<='9' && temp_gsta2>='0') )temp_gsta3+=5;
else temp_gsta3+=7;
temp_gsta++;
}
return temp_gsta3;
}
//acts like putchar() but shows the character on lcd in current position
void LCD_putchar(char c,char background){
unsigned int rows,offset,width,mapping;
unsigned int x,y,i,j,allbytes,temp_currentx,temp_currenty,byte,temp_pc;
char bg;
//bg=(background)?1:0;
bg = background;
mapping = font_Times_New_Roman_10_n_bnnn_0_n_mapping_table[c]; //conver ascii code --> order in table eg. A=10
offset=font_Times_New_Roman_10_n_bnnn_0_n_offset_table[mapping]; //index of 1st Byte of CODE
width=font_Times_New_Roman_10_n_bnnn_0_n_width_table[mapping]; //width of code
allbytes = (font_Times_New_Roman_10_n_bnnn_0_n_offset_table[mapping+1]-offset);
temp_currentx=currentx;
temp_currenty=currenty;
j=0;
for(i=0;i<allbytes;i++)
{
byte = font_Times_New_Roman_10_n_bnnn_0_n_char_table[offset+i];
temp_pc=0x80;
while(j<width)
{
if(byte&temp_pc)
{
if(background==0 || background==2)LCD_setpixel(currentx,currenty);
else LCD_clrpixel(currentx,currenty);
}
else
{
if(background==0)LCD_clrpixel(currentx,currenty);
else if(background==2);
else LCD_setpixel(currentx,currenty);
}
currentx++;
temp_pc=temp_pc>>1;
j++;
if(j%8==0)break;
}
if(j%8==0 && j<width)continue;
j=0;
currenty++;
currentx=temp_currentx;
}
currenty=temp_currenty;
currentx=temp_currentx+width;
}
//returnt the lengh of character 'c' (character width in dots)
char LCD_getcharlength(char c){
return(font_Times_New_Roman_10_n_bnnn_0_n_width_table[font_Times_New_Roman_10_n_bnnn_0_n_mapping_table[c]]);
}
//returnt the lengh of flash string 'string' (string width in dots)
char LCD_getstringlength(flash char *string){
char len=0;
while(*string){
len+=LCD_getcharlength(*string);
string++;
}
return len;
}
//returnt the lengh of flash string 'string' (string width in dots)
char LCD_getstringlength2( char *string){
char len=0;
while(*string){
len+=LCD_getcharlength(*string);
string++;
}
return len;
}
LCD_printstring(flash char *string,unsigned char bg)
{
unsigned char i=0;
while(string[i])
{
LCD_putchar(string[i],bg);
i++;
if(i>200)return;
}
}
LCD_printstring2(char *string,unsigned char bg)
{
unsigned char i=0;
while(string[i])
{
LCD_putchar(string[i],bg);
i++;
if(i>200)return;
}
}
LCD_printspace_8(char spc)
{
unsigned char i;
i=spc;
while(i)
{
LCD_putchar(127,0); //
i--;
}
}
LCD_printspace_7(char spc)
{
unsigned char i;
i=spc;
while(i)
{
LCD_puttahoma(' ',7);
i--;
}
}
void LCD_print(int x,int y, flash char *string) // send string of characters to LCD
{
int i;
int c;
LCD_xy(x,y);
for (i=0;string[i]!=0;i++) {
c = string[i] - 0x20; // convert ASCII to LCD char address
if (c<0) c=0;
LCD_dput(c);
LCD_cput(0xc0); // write character, increment memory ptr.
} // end for
} // end LCD_string
//--------------------------------------------------------------------------------
void LCD_print_ram(int x,int y,char *string) // send string of characters to LCD
{
int i;
int c;
LCD_xy(x,y);
for (i=0;string[i]!=0;i++) {
c = string[i] - 0x20; // convert ASCII to LCD char address
if (c<0) c=0;
LCD_dput(c);
LCD_cput(0xc0); // write character, increment memory ptr.
} // end for
} // end LCD_string
//--------------------------------------------------------------------------------
void LCD_setpixel(int column, int row) // set single pixel in 240x64 array
{
int addr; // memory address of byte containing pixel to write
if( (column>=LCD_XMAX) || (row>=LCD_YMAX) )return;
addr = LCD_G_BASE + (row*LCD_BYTES_PER_ROW) + (column>>3);
LCD_set_address(addr); // set LCD addr. pointer
LCD_cput(0xf8 | ((7-(column&7))) ); // set bit-within-byte command
}
//--------------------------------------------------------------------------------
void LCD_setxy(int x, int y) // set single pixel in 240x64 array
{
int addr; // memory address of byte containing pixel to write
if( (x>=LCD_XMAX) || (y>=LCD_YMAX) )return;
addr = LCD_G_BASE + (y*LCD_BYTES_PER_ROW) + (x>>3);
LCD_set_address(addr); // set LCD addr. pointer
currentx = x;
currenty = y;
}
//--------------------------------------------------------------------------------
void LCD_clrpixel(int column, int row)
{
int addr; // memory address of byte containing pixel to write
if( (column>=LCD_XMAX) || (row>=LCD_YMAX) )return;
addr = LCD_G_BASE + (row*LCD_BYTES_PER_ROW) + (column>>3);
LCD_set_address(addr); // set LCD addr. pointer
LCD_cput(0xf0 | ((7-(column&7))) ); // set bit-within-byte command
}
//---------------------------------------------------------------------------------
void LCD_pixel(int column, int row,char show)
{
int addr; // memory address of byte containing pixel to write
if( (column>=LCD_XMAX) || (row>=LCD_YMAX) )return;
addr = LCD_G_BASE + (row*LCD_BYTES_PER_ROW) + (column/8);
LCD_set_address(addr); // set LCD addr. pointer
if(show)
LCD_cput(0xf8 | ((7-column%8)) ); // set bit-within-byte command
else
LCD_cput(0xf0 | ((7-column%8)) ); // set bit-within-byte command
}
//---------------------------------------------------------------------------------
void LCD_show(flash char * s,int start_line,int how_many_line){
int addr,i;
addr = LCD_G_BASE +start_line*30;
LCD_set_address(addr); // set LCD addr. pointer
LCD_cput(0xB0);
for(i=0;i<how_many_line*30;i++){
LCD_dput(s[i]);
}
LCD_cput(0xB2);
}
void LCD_xy(int x, int y) // set memory pointer to (x,y) position (text)
{
int addr;
addr = LCD_T_BASE + (y * LCD_BYTES_PER_ROW) + x;
LCD_set_address(addr); // set LCD addr. pointer
} // lcd_xy1()
/* ==============================================================
* Low-level I/O routines to interface to LCD display
* based on four routines:
*
* LCD_dput(): write data byte
* LCD_cput(): write control byte
* LCD_dget(): read data byte (UNTESTED)
* LCD_sget(): read status
* ==============================================================
*/
void LCD_setup() // make sure control lines are at correct levels
{
/* DDR(LCD_ce_PORT) |= _BV(LCD_ce_PIN);
DDR(LCD_rd_PORT) |= _BV(LCD_rd_PIN);
DDR(LCD_wr_PORT) |= _BV(LCD_wr_PIN);
DDR(LCD_cd_PORT) |= _BV(LCD_cd_PIN);
DDR(LCD_rst_PORT) |= _BV(LCD_rst_PIN); */
LCD_RST_DIR=1;
LCD_CE_DIR=1;
LCD_CD_DIR=1;
LCD_R_DIR=1;
LCD_W_DIR=1;
LCD_ce_high();
LCD_rd_high();
LCD_wr_high();
LCD_cd_high();
LCD_SET_DATADIR_OUT();
LCD_rst_high();
delay_ms(5);
LCD_rst_low();
delay_ms(5);
LCD_rst_high();
} // end LCD_setup()
//---------------------------------------------------------------------------
void LCD_init() // initialize LCD memory and display modes
{
LCD_dput(LCD_G_BASE%256);
LCD_dput(LCD_G_BASE>>8);
LCD_cput(0x42); // set graphics memory to address LCD_G_BASE
LCD_dput(LCD_BYTES_PER_ROW);
LCD_dput(0);
LCD_cput(0x43); // n bytes per graphics line
LCD_dput(LCD_T_BASE%256);
LCD_dput(LCD_T_BASE>>8);
LCD_cput(0x40); // text memory at address LCD_T_BASE1
LCD_dput(LCD_BYTES_PER_ROW%256);
LCD_dput(LCD_BYTES_PER_ROW>>8);
LCD_cput(0x41); // n bytes per text line
LCD_cput(0x80); // mode set: Graphics OR Text, ROM CGen
LCD_cput(0xa0); // cursor is 8 lines high
LCD_dput(0x00);
LCD_dput(0x00);
LCD_cput(0x21); // put cursor at (x,y) location
LCD_cput(0x9C);
// (For cursor to be visible, need to set up position
} // end LCD_init()
// -------------------------------------------------------------------------------
int LCD_sget(void) // get LCD display status byte
{
int LCD_status;
LCD_SET_DATADIR_IN();
LCD_cd_high(); // bring LCD C/D line high (read status byte)
LCD_rd_low(); // bring LCD /RD line low (read active)
LCD_ce_low(); // bring LCD /CE line low (chip-enable active)
#asm("nop")
#asm("nop")
delay_us(1);
LCD_status = LCD_DATA_PIN; // read LCD status byte
LCD_ce_high(); // bring LCD /CE line high, disabling it
LCD_rd_high(); // deactivate LCD read mode
LCD_SET_DATADIR_OUT(); // make 8-bit parallel port an output port
/* printf("%x ",LCD_status);
delay_ms(1); */
return(LCD_status);
} // sget1()
//------------------------------------------------------------------------------------------
void LCD_dput(int byte) // write data byte to LCD module over par. port
// assume PC port in data OUTPUT mode
{
do {} while ((0x03 & LCD_sget()) != 0x03); // wait until display ready
LCD_cd_low();
LCD_wr_low(); // activate LCD's write mode
LCD_DATA_PORT = byte; // write value to data port
LCD_ce_low(); // pulse enable LOW > 80 ns (hah!)
#asm("nop")
#asm("nop")
delay_us(1);
LCD_ce_high(); // return enable HIGH
LCD_wr_high(); // restore Write mode to inactive
// using my P5/75 MHz PC with ISA bus, CE stays low for 2 microseconds
} // end dput1()
//------------------------------------------------------------------------------------------
int LCD_dget(void) // get data byte from LCD module
{
int LCD_byte;
do {} while ((0x03 & LCD_sget()) != 0x03); // wait until display ready
LCD_SET_DATADIR_IN(); // make PC's port an input port
LCD_wr_high(); // make sure WRITE mode is inactive
LCD_cd_low(); // data mode
LCD_rd_low(); // activate READ mode
LCD_ce_low(); // enable chip, which outputs data
LCD_byte = LCD_DATA_PIN; // read data from LCD
LCD_ce_high(); // disable chip
LCD_rd_high(); // turn off READ mode
LCD_SET_DATADIR_OUT(); // make 8-bit parallel port an output port
return(LCD_byte);
} // LCD_dget1()
//----------------------------------------------------------------------------------------
void LCD_cput(int byte) // write command byte to LCD module
// assumes port is in data OUTPUT mode
{
do {} while ((0x03 & LCD_sget()) != 0x03); // wait until display ready
LCD_DATA_PORT = byte; // present data to LCD on PC's port pins
LCD_cd_high(); // control/status mode
LCD_rd_high(); // make sure LCD read mode is off
LCD_wr_low(); // activate LCD write mode
LCD_ce_low(); // pulse ChipEnable LOW, > 80 ns, enables LCD I/O
LCD_ce_high(); // disable LCD I/O
LCD_wr_high(); // deactivate write mode
} // LCD_cput()
/***********************************************************************
Draws a line from x1,y1 go x2,y2. Line can be drawn in any direction.
Set show1 to 1 to draw pixel, set to 0 to hide pixel.
***********************************************************************/
void LCD_line(int x1, int y1, int x2, int y2, unsigned char show)
{
int dy ;
int dx ;
int stepx, stepy, fraction;
dy = y2 - y1;
dx = x2 - x1;
if (dy < 0)
{
dy = -dy;
stepy = -1;
}
else
{
stepy = 1;
}
if (dx < 0)
{
dx = -dx;
stepx = -1;
}
else
{
stepx = 1;
}
dy <<= 1;
dx <<= 1;
LCD_pixel(x1,y1,show);
if (dx > dy)
{
fraction = dy - (dx >> 1);
while (x1 != x2)
{
if (fraction >= 0)
{
y1 += stepy;
fraction -= dx;
}
x1 += stepx;
fraction += dy;
LCD_pixel(x1,y1,show);
}
}
else
{
fraction = dx - (dy >> 1);
while (y1 != y2)
{
if (fraction >= 0)
{
x1 += stepx;
fraction -= dy;
}
y1 += stepy;
fraction += dx;
LCD_pixel(x1,y1,show);
}
}
}
/***********************************************************************
Draws a circle with center at x,y with given radius.
Set show1 to 1 to draw pixel, set to 0 to hide pixel.
***********************************************************************/
void LCD_circle(int x, int y, int radius, unsigned char show)
{
int xc = 0;
int yc ;
int p ;
yc=radius;
p = 3 - (radius<<1);
while (xc <= yc)
{
LCD_pixel(x + xc, y + yc, show);
LCD_pixel(x + xc, y - yc, show);
LCD_pixel(x - xc, y + yc, show);
LCD_pixel(x - xc, y - yc, show);
LCD_pixel(x + yc, y + xc, show);
LCD_pixel(x + yc, y - xc, show);
LCD_pixel(x - yc, y + xc, show);
LCD_pixel(x - yc, y - xc, show);
if (p < 0)
p += (xc++ << 2) + 6;
else
p += ((xc++ - yc--)<<2) + 10;
}
}
void LCD_circle_half(int x, int y, int radius, unsigned char show)
{
int xc = 0;
int yc ;
int p ;
yc=radius;
p = 3 - (radius<<1);
while (xc <= yc)
{
// LCD_pixel(x + xc, y + yc, show);
LCD_pixel(x + xc, y - yc, show);
// LCD_pixel(x - xc, y + yc, show);
LCD_pixel(x - xc, y - yc, show);
// LCD_pixel(x + yc, y + xc, show);
LCD_pixel(x + yc, y - xc, show);
// LCD_pixel(x - yc, y + xc, show);
LCD_pixel(x - yc, y - xc, show);
if (p < 0)