Add two escape sequences to terminalio.Termial:

- ESC[yy;xxH : move cursor to (xx, yy)
- ESC[2J     : clear screen

1 files changed, 38 insertions, 3 deletions

diff --git a/shared-module/terminalio/Terminal.c b/shared-module/terminalio/Terminal.c
index 4589c9149..eb8b27208 100644
--- a/shared-module/terminalio/Terminal.c
+++ b/shared-module/terminalio/Terminal.c
@@ -93,6 +93,39 @@ size_t common_hal_terminalio_terminal_write(terminalio_terminal_obj_t *self, con
                                 self->cursor_x -= n;
                             }
                         }
+			if (c == 'J') {
+			  if (n == 2) {
+			    common_hal_displayio_tilegrid_set_top_left(self->tilegrid, 0, 0);
+			    self->cursor_x = self->cursor_y = start_y = 0;
+			    n = 0;
+			    for (uint16_t x = 0; x < self->tilegrid->width_in_tiles; x++) {
+			      for (uint16_t y = 0; y < self->tilegrid->height_in_tiles; y++) {
+				common_hal_displayio_tilegrid_set_tile(self->tilegrid, x, y, 0);
+			      }
+			    }
+			  }
+			}
+                        if (c == ';') {
+			  int16_t m = 0;
+			  for(++j; j < 9; j++) {
+                            if ('0' <= i[j] && i[j] <= '9') {
+                                m = m * 10 + (i[j] - '0');
+                            } else {
+                                c = i[j];
+                                break;
+                            }
+			  }
+			  if (c == 'H') {
+			    if (n >= self->tilegrid->height_in_tiles)
+			      n = self->tilegrid->height_in_tiles - 1;
+			    if (m >= self->tilegrid->width_in_tiles)
+			      m = self->tilegrid->width_in_tiles - 1;
+			    n = (n + self->tilegrid->top_left_y) % self->tilegrid->height_in_tiles;
+			    self->cursor_x = m;
+			    self->cursor_y = n;
+			    start_y = self->cursor_y;
+			  }
+                        }
                         i += j + 1;
                         continue;
                     }
@@ -114,12 +147,14 @@ size_t common_hal_terminalio_terminal_write(terminalio_terminal_obj_t *self, con
             self->cursor_y %= self->tilegrid->height_in_tiles;
         }
         if (self->cursor_y != start_y) {
-            // clear the new row
+	  // clear the new row in case of scroll up
+	  if (self->cursor_y == self->tilegrid->top_left_y) {
             for (uint16_t j = 0; j < self->tilegrid->width_in_tiles; j++) {
                 common_hal_displayio_tilegrid_set_tile(self->tilegrid, j, self->cursor_y, 0);
-                start_y = self->cursor_y;
             }
-            common_hal_displayio_tilegrid_set_top_left(self->tilegrid, 0, (start_y + self->tilegrid->height_in_tiles + 1) % self->tilegrid->height_in_tiles);
+            common_hal_displayio_tilegrid_set_top_left(self->tilegrid, 0, (self->cursor_y + self->tilegrid->height_in_tiles + 1) % self->tilegrid->height_in_tiles);
+	  }
+	  start_y = self->cursor_y;
         }
     }
     return i - data;