mirror of
https://github.com/travisgoodspeed/goodwatch
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276 lines
6.3 KiB
C
276 lines
6.3 KiB
C
/*! \file lcdtext.c
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\brief LCD font and text drawing functions.
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*/
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#include "lcd.h"
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#include "lcdtext.h"
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/* Digits look like this, and we index them with 0 being the
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leftmost.
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AAAAA
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F B
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F B
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F B
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GGGGG
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E C
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E C
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E C
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DDDDD dp
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*/
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//! This maps the segments of each digit.
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const int lcdmap[10][8]={
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// A, B, C, D, E, F, G, dp digit
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{0x0b04, 0x0b40, 0x0b20, 0x0b01, 0x0a10, 0x0a20, 0x0b02, 0x0b10}, //0
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{0x0940, 0x0a04, 0x0a02, 0x0910, 0x0901, 0x0902, 0x0920, 0x0a01}, //1
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{0x0804, 0x0840, 0x0820, 0x0801, 0x0710, 0x0720, 0x0802, 0x0810}, //2
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{0x0640, 0x0704, 0x0702, 0x0610, 0x0601, 0x0602, 0x0620, 0x0701}, //3
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{0x0504, 0x0540, 0x0520, 0x0501, 0x0410, 0x0420, 0x0502, 0x0510}, //4
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{0x0c02, 0x0404, 0x0402, 0x0310, 0x0302, 0x0304, 0x0340, 0x0401}, //5
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{0x0204, 0x0220, 0x0210, 0x0201, 0x0110, 0x0120, 0x0202, 0x0301}, //6
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{0x0040, 0x0104, 0x0102, 0x0010, 0x0001, 0x0002, 0x0020, 0x0240}, //7
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};
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//These are the fragments of the day of the week: 0x0904, 0x0a40, 0x0c01
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//0x0c10 is beyond the screen.
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//0x0240 seems not to be wired to any visible segment, but we use it
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//as the rightmost decimal point because we don't seem to have that
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//cell.
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//! Bit flags for each of the eight segments.
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enum lcdmappos {A=1, B=2, C=4, D=8, E=0x10, F=0x20, G=0x40, DP=0x80};
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//! Font for numbers.
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const int numfont[]={
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A|B|C|D|E|F, //0
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B|C, //1
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A|B|G|E|D, //2
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A|B|G|C|D, //3
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F|G|B|C, //4
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A|F|G|C|D, //5
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A|F|G|E|C|D, //6
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A|B|C, //7
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A|B|C|D|E|F|G, //8
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A|B|G|F|C|D, //9
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A|F|B|G|E|C, //A
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F|E|G|C|D, //B
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A|F|E|D, //C
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E|G|C|D|B, //D
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A|F|E|G|D, //E
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A|G|F|E //F
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};
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//! Font for letters.
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const int letterfont[]={
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/* This font begins at 0x41 hex in the ASCII table, rendering
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letters as best they can be on the 7-segment display.
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*/
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A|F|B|G|E|C, //A
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F|E|G|C|D, //B
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A|F|E|D, //C
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E|G|C|D|B, //D
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A|F|E|G|D, //E
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A|G|F|E, //F
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A|F|G|E|C|D, //G, looks like a six.
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F|G|E|C, //h
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F|E, //I, distinguished from a 1 by being on the left side.
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E|B|C|D, //J
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F|E|B|C|G|DP, //K, distinguished from an X by the DP.
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F|E|D, //L
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F|G|B|C, //M (Think mu.)
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E|G|C, //n
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A|B|C|D|E|F, //O
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F|A|B|G|E, //P
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F|A|B|C|D|E|DP,//Q
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E|G, //R
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A|F|G|C|D, //S (Looks like a 5.)
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F|E|G, //T
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F|E|D|C|B, //U
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F|E|D|C|B, //V (Same as U. Blame Rome.)
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F|E|D|C|B, //W (Same as U and V. Blame Germany.)
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F|G|E|B|C, //X
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F|G|B|E, //Y
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A|B|G|E|D //Z
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};
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//! Sets a pixel.
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#define DRAWPOINT(todraw) lcdm[todraw>>8]|=todraw&0xFF
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//! Clears a pixel.
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#define CLEARPOINT(todraw) lcdm[todraw>>8]&=~(todraw&0xFF)
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//! Draws one LCD digit.
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void lcd_digit(int pos, int digit){
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int segments=numfont[digit];
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int bit;
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for(bit=0;bit<8;bit++){
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if(segments&(1<<bit))
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DRAWPOINT(lcdmap[pos][bit]);
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else
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CLEARPOINT(lcdmap[pos][bit]);
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}
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}
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//! Draws one LCD character
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void lcd_char(int pos, char c){
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int segments;//=numfont[digit];
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int bit;
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//Numbers handled by another function until we unify the font.
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if(c>='0' && c<='9'){
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lcd_digit(pos, c&0x0F);
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return;
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}else if(c==' '){
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lcd_cleardigit(pos);
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return;
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}
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c&=~0x20;
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segments=letterfont[c-'A'];
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for(bit=0;bit<8;bit++){
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if(segments&(1<<bit))
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DRAWPOINT(lcdmap[pos][bit]);
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else
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CLEARPOINT(lcdmap[pos][bit]);
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}
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}
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//! Clears one LCD digit.
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void lcd_cleardigit(int pos){
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int bit;
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for(bit=0;bit<8;bit++)
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CLEARPOINT(lcdmap[pos][bit]);
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}
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//! Draws a string to the LCD.
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void lcd_string(const char *str){
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int i=7;//LCD position.
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while(i>=0 && *str){
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lcd_char(i--, *str++);
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}
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}
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//! Draws a decimal number on the screen.
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void lcd_number(long num){
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static long bcd=0;
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static long oldnum=0;
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int i;
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/* This conversion takes too long at 32kHz, so we cache the last
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value for rendering. */
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if(oldnum==num){
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lcd_hex(bcd);
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return;
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}
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/* Otherwise we convert it with expensive divisions. */
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bcd=0;
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oldnum=num;
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for(i=0;i<8 && num;i++){
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bcd|=((num%10)<<(4*i));
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num/=10;
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}
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lcd_hex(bcd);
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}
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//! Draws hex on the screen.
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void lcd_hex(long num){
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/* So in an ideal world, we'd have characters arranged nicely into
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LCDM[] bytes as some development tools do, but in the real world,
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we're pretty much stuck with them as they are physically
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arranged.
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This function takes a buffer of eight hex characters and displays
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them on the screen.
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*/
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int i;
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for(i=0;i<8;i++)
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lcd_digit(i,(num>>(4*i))&0xf);
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}
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//! Activates a period, or turns it off.
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void setperiod(int digit, int on){
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if(on) //On
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DRAWPOINT(lcdmap[digit][7]);
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else //Off
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CLEARPOINT(lcdmap[digit][7]);
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}
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//! Activates the colon. 2 for invert.
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void setcolon(int on){
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if(on==2) //Blink
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lcdm[3]^=0x20;
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else if(on==1) //On
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lcdm[3]|=0x20;
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else //Off
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lcdm[3]&=~0x20;
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}
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//! Activates the am. 2 for invert.
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void setam(int on){
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if(on==2) //Blink
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lcdm[0]^=0x04;
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else if(on==1) //On
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lcdm[0]|=0x04;
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else //Off
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lcdm[0]&=~0x04;
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}
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//! Activates the pm. 2 for invert.
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void setpm(int on){
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if(on==2) //Blink
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lcdm[1]^=0x40;
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else if(on==1) //On
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lcdm[1]|=0x40;
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else //Off
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lcdm[1]&=~0x40;
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}
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//! Activates the mult sign. 2 for invert.
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void setmult(int on){
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if(on==2) //Blink
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lcdm[4]^=0x40;
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else if(on==1) //On
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lcdm[4]|=0x40;
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else //Off
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lcdm[4]&=~0x40;
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}
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//! Activates the minus sign. 2 for invert.
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void setminus(int on){
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if(on==2) //Blink
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lcdm[6]^=0x04;
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else if(on==1) //On
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lcdm[6]|=0x04;
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else //Off
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lcdm[6]&=~0x04;
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}
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//! Activates the plus sign. 2 for invert.
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void setplus(int on){
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if(on==2) //Blink
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lcdm[7]^=0x40;
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else if(on==1) //On
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lcdm[7]|=0x40;
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else //Off
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lcdm[7]&=~0x40;
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}
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//! Activates the divide sign. 2 for invert.
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void setdivide(int on){
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if(on==2) //Blink
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lcdm[0xc]^=0x04;
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else if(on==1) //On
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lcdm[0xc]|=0x04;
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else //Off
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lcdm[0xc]&=~0x04;
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}
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