terminal/term.ino

   1 #include "term.h"
   2
   3 void redraw(struct terminal *term)
   4 {
   5         lcd.noCursor();
   6         lcd.clear();
   7         lcd.home();
   8         for (byte i = 0; i < COLS * ROWS; i++) {
   9                 if (i % COLS == 0)
  10                         lcd.setCursor(i % COLS, i / COLS);
  11                 lcd.write(term->contents[i]);
  12         }
  13         lcd.cursor();
  14 }
  15
  16 void scroll_up(struct terminal *term)
  17 {
  18         for (byte i = 0; i < COLS * (ROWS - 1); i++)
  19                 term->contents[i] = term->contents[i + COLS];
  20         for (byte i = COLS * (ROWS - 1); i < COLS * ROWS; i++)
  21                 term->contents[i] = ' ';
  22         redraw(term);
  23 }
  24
  25 /**
  26  * Special character meanings are defined here.
  27  */
  28 void write(struct terminal *term, char ch)
  29 {
  30         switch (ch) {
  31                 case '\r':
  32                         term->x = 0;
  33                         lcd.setCursor(term->x, term->y);
  34                         break;
  35                 case '\n':
  36                         if (++term->y >= ROWS) {
  37                                 term->y--;
  38                                 scroll_up(term);
  39                         }
  40                         lcd.setCursor(term->x, term->y);
  41                         break;
  42                 case 0x7f:
  43                         if (term->x != 0) {
  44                                 term->x--;
  45                                 term->contents[term->x + term->y * COLS] = 0x00;
  46                                 lcd.setCursor(term->x, term->y);
  47                                 lcd.write(' ');
  48                                 lcd.setCursor(term->x, term->y);
  49                         }
  50                         break;
  51                 default:
  52                         term->contents[term->x + term->y * COLS] = ch;
  53                         lcd.write(ch);
  54                         if (++term->x >= COLS) {
  55                                 term->x = 0;
  56                                 if (++term->y >= ROWS) {
  57                                         term->y--;
  58                                         scroll_up(term);
  59                                 }
  60                                 lcd.setCursor(term->x, term->y);
  61                         }
  62         }
  63 }