Hook up the terminal based on the first display.

20 files changed, 453 insertions, 125 deletions

diff --git a/main.c b/main.c
index e137f7d47..45c6da817 100755
--- a/main.c
+++ b/main.c
@@ -209,6 +209,7 @@ bool run_code_py(safe_mode_t safe_mode) {
         #endif
         stop_mp();
         free_memory(heap);
+        supervisor_move_memory();
 
         reset_port();
         reset_board_busses();
@@ -221,6 +222,10 @@ bool run_code_py(safe_mode_t safe_mode) {
     }
 
     // Wait for connection or character.
+    if (!serial_connected_at_start) {
+        serial_write_compressed(translate("\nCode done running. Waiting for USB.\n"));
+    }
+
     bool serial_connected_before_animation = false;
     rgb_status_animation_t animation;
     prep_rgb_status_animation(&result, found_main, safe_mode, &animation);
@@ -342,6 +347,7 @@ void __attribute__ ((noinline)) run_boot_py(safe_mode_t safe_mode) {
         reset_board();
         stop_mp();
         free_memory(heap);
+        supervisor_move_memory();
     }
 }
 
@@ -362,6 +368,7 @@ int run_repl(void) {
     reset_board();
     stop_mp();
     free_memory(heap);
+    supervisor_move_memory();
     autoreload_resume();
     return exit_code;
 }
diff --git a/ports/atmel-samd/mpconfigport.h b/ports/atmel-samd/mpconfigport.h
index 811d4eda4..4c8002c56 100644
--- a/ports/atmel-samd/mpconfigport.h
+++ b/ports/atmel-samd/mpconfigport.h
@@ -467,6 +467,7 @@ extern const struct _mp_obj_module_t pixelbuf_module;
     mp_obj_t rtc_time_source; \
     FLASH_ROOT_POINTERS \
     mp_obj_t gamepad_singleton; \
+    mp_obj_t terminal_tilegrid_tiles; \
     NETWORK_ROOT_POINTERS \
 
 void run_background_tasks(void);
diff --git a/shared-bindings/displayio/Display.c b/shared-bindings/displayio/Display.c
index d61732f6f..1838228af 100644
--- a/shared-bindings/displayio/Display.c
+++ b/shared-bindings/displayio/Display.c
@@ -133,11 +133,15 @@ STATIC mp_obj_t displayio_display_make_new(const mp_obj_type_t *type, size_t n_a
 //|
 STATIC mp_obj_t displayio_display_obj_show(mp_obj_t self_in, mp_obj_t group_in) {
     displayio_display_obj_t *self = MP_OBJ_TO_PTR(self_in);
-    mp_obj_t native_layer = mp_instance_cast_to_native_base(group_in, &displayio_group_type);
-    if (native_layer == MP_OBJ_NULL) {
-        mp_raise_ValueError(translate("Must be a Group subclass."));
+    displayio_group_t* group = NULL;
+    if (group_in != mp_const_none) {
+        mp_obj_t native_layer = mp_instance_cast_to_native_base(group_in, &displayio_group_type);
+        if (native_layer == MP_OBJ_NULL) {
+            mp_raise_ValueError(translate("Must be a Group subclass."));
+        }
+        group = MP_OBJ_TO_PTR(native_layer);
     }
-    displayio_group_t* group = MP_OBJ_TO_PTR(native_layer);
+
     common_hal_displayio_display_show(self, group);
     return mp_const_none;
 }
diff --git a/shared-bindings/displayio/TileGrid.c b/shared-bindings/displayio/TileGrid.c
index b8531a923..0026cd62f 100644
--- a/shared-bindings/displayio/TileGrid.c
+++ b/shared-bindings/displayio/TileGrid.c
@@ -138,9 +138,9 @@ STATIC mp_obj_t displayio_tilegrid_make_new(const mp_obj_type_t *type, size_t n_
 
     displayio_tilegrid_t *self = m_new_obj(displayio_tilegrid_t);
     self->base.type = &displayio_tilegrid_type;
-    common_hal_displayio_tilegrid_construct(self, native, args[ARG_pixel_shader].u_obj,
-        args[ARG_width].u_int, args[ARG_height].u_int, tile_width, tile_height, x, y,
-        args[ARG_default_tile].u_int);
+    common_hal_displayio_tilegrid_construct(self, native, bitmap_width / tile_width,
+        args[ARG_pixel_shader].u_obj, args[ARG_width].u_int, args[ARG_height].u_int,
+        tile_width, tile_height, x, y, args[ARG_default_tile].u_int);
     return MP_OBJ_FROM_PTR(self);
 }
 
diff --git a/shared-bindings/displayio/TileGrid.h b/shared-bindings/displayio/TileGrid.h
index f553be423..a74fa4d39 100644
--- a/shared-bindings/displayio/TileGrid.h
+++ b/shared-bindings/displayio/TileGrid.h
@@ -32,7 +32,7 @@
 extern const mp_obj_type_t displayio_tilegrid_type;
 
 void common_hal_displayio_tilegrid_construct(displayio_tilegrid_t *self, mp_obj_t bitmap,
-        mp_obj_t pixel_shader, uint16_t width, uint16_t height,
+        uint16_t bitmap_width_in_tiles, mp_obj_t pixel_shader, uint16_t width, uint16_t height,
         uint16_t tile_width, uint16_t tile_height, uint16_t x, uint16_t y, uint8_t default_tile);
 
 void common_hal_displayio_tilegrid_get_position(displayio_tilegrid_t *self, int16_t* x, int16_t* y);
diff --git a/shared-module/displayio/Display.c b/shared-module/displayio/Display.c
index 7946111b7..fd082c19d 100644
--- a/shared-module/displayio/Display.c
+++ b/shared-module/displayio/Display.c
@@ -30,6 +30,8 @@
 #include "shared-bindings/displayio/FourWire.h"
 #include "shared-bindings/displayio/ParallelBus.h"
 #include "shared-bindings/time/__init__.h"
+#include "shared-module/displayio/__init__.h"
+#include "supervisor/shared/display.h"
 
 #include <stdint.h>
 
@@ -47,6 +49,7 @@ void common_hal_displayio_display_construct(displayio_display_obj_t* self,
     self->set_column_command = set_column_command;
     self->set_row_command = set_row_command;
     self->write_ram_command = write_ram_command;
+    self->refresh = false;
     self->current_group = NULL;
     self->colstart = colstart;
     self->rowstart = rowstart;
@@ -86,9 +89,19 @@ void common_hal_displayio_display_construct(displayio_display_obj_t* self,
         i += 2 + data_size;
     }
     self->end_transaction(self->bus);
+
+    supervisor_start_terminal(width, height);
+
+    // Set the group after initialization otherwise we may send pixels while we delay in
+    // initialization.
+    self->refresh = true;
+    self->current_group = &circuitpython_splash;
 }
 
 void common_hal_displayio_display_show(displayio_display_obj_t* self, displayio_group_t* root_group) {
+    if (root_group == NULL) {
+        root_group = &circuitpython_splash;
+    }
     self->current_group = root_group;
     common_hal_displayio_display_refresh_soon(self);
 }
diff --git a/shared-module/displayio/Group.c b/shared-module/displayio/Group.c
index 46898fb8e..bbbd83486 100644
--- a/shared-module/displayio/Group.c
+++ b/shared-module/displayio/Group.c
@@ -105,12 +105,19 @@ bool displayio_group_needs_refresh(displayio_group_t *self) {
     }
     for (int32_t i = self->size - 1; i >= 0 ; i--) {
         mp_obj_t layer = self->children[i];
-        if (MP_OBJ_IS_TYPE(layer, &displayio_sprite_type)) {
+        if (MP_OBJ_IS_TYPE(layer, &displayio_tilegrid_type)) {
+            if (displayio_tilegrid_needs_refresh(layer)) {
+                return true;
+            }
+        } else if (MP_OBJ_IS_TYPE(layer, &displayio_group_type)) {
+            if (displayio_group_needs_refresh(layer)) {
+                return true;
+            }
+        } else if (MP_OBJ_IS_TYPE(layer, &displayio_sprite_type)) {
             if (displayio_sprite_needs_refresh(layer)) {
                 return true;
             }
         }
-        // TODO: Tiled layer
     }
     return false;
 }
@@ -119,9 +126,12 @@ void displayio_group_finish_refresh(displayio_group_t *self) {
     self->needs_refresh = false;
     for (int32_t i = self->size - 1; i >= 0 ; i--) {
         mp_obj_t layer = self->children[i];
-        if (MP_OBJ_IS_TYPE(layer, &displayio_sprite_type)) {
+        if (MP_OBJ_IS_TYPE(layer, &displayio_tilegrid_type)) {
+            displayio_tilegrid_finish_refresh(layer);
+        } else if (MP_OBJ_IS_TYPE(layer, &displayio_group_type)) {
+            displayio_group_finish_refresh(layer);
+        } else if (MP_OBJ_IS_TYPE(layer, &displayio_sprite_type)) {
             displayio_sprite_finish_refresh(layer);
         }
-        // TODO: Tiled layer
     }
 }
diff --git a/shared-module/displayio/TileGrid.c b/shared-module/displayio/TileGrid.c
index 44874e283..ed724bf10 100644
--- a/shared-module/displayio/TileGrid.c
+++ b/shared-module/displayio/TileGrid.c
@@ -33,6 +33,7 @@
 #include "shared-bindings/displayio/Shape.h"
 
 void common_hal_displayio_tilegrid_construct(displayio_tilegrid_t *self, mp_obj_t bitmap,
+        uint16_t bitmap_width_in_tiles,
         mp_obj_t pixel_shader, uint16_t width, uint16_t height,
         uint16_t tile_width, uint16_t tile_height, uint16_t x, uint16_t y, uint8_t default_tile) {
     uint32_t total_tiles = width * height;
@@ -44,8 +45,9 @@ void common_hal_displayio_tilegrid_construct(displayio_tilegrid_t *self, mp_obj_
         self->tiles = (uint8_t*) m_malloc(total_tiles, false);
         self->inline_tiles = false;
     }
+    self->bitmap_width_in_tiles = bitmap_width_in_tiles;
     self->width_in_tiles = width;
-    self->height_in_tiles = width;
+    self->height_in_tiles = height;
     self->total_width = width * tile_width;
     self->total_height = height * tile_height;
     self->tile_width = tile_width;
@@ -87,10 +89,13 @@ bool displayio_tilegrid_get_pixel(displayio_tilegrid_t *self, int16_t x, int16_t
     if (self->inline_tiles) {
         tiles = (uint8_t*) &self->tiles;
     }
+    if (tiles == NULL) {
+        return false;
+    }
     uint16_t tile_location = (y / self->tile_height) * self->width_in_tiles + x / self->tile_width;
     uint8_t tile = tiles[tile_location];
-    uint16_t tile_x = tile_x = (tile % self->width_in_tiles) * self->tile_width + x % self->tile_width;
-    uint16_t tile_y = tile_y = (tile / self->width_in_tiles) * self->tile_height + y % self->tile_height;
+    uint16_t tile_x = tile_x = (tile % self->bitmap_width_in_tiles) * self->tile_width + x % self->tile_width;
+    uint16_t tile_y = tile_y = (tile / self->bitmap_width_in_tiles) * self->tile_height + y % self->tile_height;
 
     uint32_t value = 0;
     if (MP_OBJ_IS_TYPE(self->bitmap, &displayio_bitmap_type)) {
@@ -118,7 +123,11 @@ void common_hal_displayio_textgrid_set_tile(displayio_tilegrid_t *self, uint16_t
     if (self->inline_tiles) {
         tiles = (uint8_t*) &self->tiles;
     }
+    if (tiles == NULL) {
+        return;
+    }
     tiles[y * self->width_in_tiles + x] = tile_index;
+    self->needs_refresh = true;
 }
 
 bool displayio_tilegrid_needs_refresh(displayio_tilegrid_t *self) {
diff --git a/shared-module/displayio/TileGrid.h b/shared-module/displayio/TileGrid.h
index c24a606a3..84e3e7ef2 100644
--- a/shared-module/displayio/TileGrid.h
+++ b/shared-module/displayio/TileGrid.h
@@ -38,6 +38,7 @@ typedef struct {
     mp_obj_t pixel_shader;
     uint16_t x;
     uint16_t y;
+    uint16_t bitmap_width_in_tiles;
     uint16_t width_in_tiles;
     uint16_t height_in_tiles;
     uint16_t total_width;
diff --git a/shared-module/displayio/__init__.c b/shared-module/displayio/__init__.c
index 61228f8d2..dbfeacc3d 100644
--- a/shared-module/displayio/__init__.c
+++ b/shared-module/displayio/__init__.c
@@ -9,6 +9,7 @@
 #include "shared-bindings/displayio/Palette.h"
 #include "shared-bindings/displayio/Sprite.h"
 #include "supervisor/shared/display.h"
+#include "supervisor/memory.h"
 #include "supervisor/usb.h"
 
 primary_display_t displays[CIRCUITPY_DISPLAY_LIMIT];
@@ -68,76 +69,24 @@ void displayio_refresh_displays(void) {
     }
 }
 
-uint32_t blinka_bitmap_data[32] = {
-    0x00000011, 0x11000000,
-    0x00000111, 0x53100000,
-    0x00000111, 0x56110000,
-    0x00000111, 0x11140000,
-    0x00000111, 0x20002000,
-    0x00000011, 0x13000000,
-    0x00000001, 0x11200000,
-    0x00000000, 0x11330000,
-    0x00000000, 0x01122000,
-    0x00001111, 0x44133000,
-    0x00032323, 0x24112200,
-    0x00111114, 0x44113300,
-    0x00323232, 0x34112200,
-    0x11111144, 0x44443300,
-    0x11111111, 0x11144401,
-    0x23232323, 0x21111110
-};
-
-displayio_bitmap_t blinka_bitmap = {
-    .base = {.type = &displayio_bitmap_type },
-    .width = 16,
-    .height = 16,
-    .data = blinka_bitmap_data,
-    .stride = 2,
-    .bits_per_value = 4,
-    .x_shift = 3,
-    .x_mask = 0x7,
-    .bitmask = 0xf
-};
-
-uint32_t blinka_transparency[1] = {0x80000000};
-
-// These colors are RGB 565 with the bytes swapped.
-uint32_t blinka_colors[8] = {0x78890000, 0x9F86B8FC, 0xffff0D5A, 0x0000f501,
-                             0x00000000, 0x00000000, 0x00000000, 0x00000000};
-
-displayio_palette_t blinka_palette = {
-    .base = {.type = &displayio_palette_type },
-    .opaque = blinka_transparency,
-    .colors = blinka_colors,
-    .color_count = 16,
-    .needs_refresh = false
-};
-
-displayio_sprite_t blinka_sprite = {
-    .base = {.type = &displayio_sprite_type },
-    .bitmap = &blinka_bitmap,
-    .pixel_shader = &blinka_palette,
-    .x = 0,
-    .y = 0,
-    .width = 16,
-    .height = 16,
-    .needs_refresh = false
-};
-
-mp_obj_t splash_children[1] = {
-    &blinka_sprite,
-};
+void common_hal_displayio_release_displays(void) {
+    for (uint8_t i = 0; i < CIRCUITPY_DISPLAY_LIMIT; i++) {
+        mp_const_obj_t bus_type = displays[i].fourwire_bus.base.type;
+        if (bus_type == NULL) {
+            continue;
+        } else if (bus_type == &displayio_fourwire_type) {
+            common_hal_displayio_fourwire_deinit(&displays[i].fourwire_bus);
+        } else if (bus_type == &displayio_parallelbus_type) {
+            common_hal_displayio_parallelbus_deinit(&displays[i].parallel_bus);
+        }
+        displays[i].fourwire_bus.base.type = &mp_type_NoneType;
+    }
+    for (uint8_t i = 0; i < CIRCUITPY_DISPLAY_LIMIT; i++) {
+        displays[i].display.base.type = &mp_type_NoneType;
+    }
 
-displayio_group_t splash = {
-    .base = {.type = &displayio_group_type },
-    .x = 0,
-    .y = 0,
-    .scale = 2,
-    .size = 1,
-    .max_size = 1,
-    .children = splash_children,
-    .needs_refresh = true
-};
+    supervisor_stop_terminal();
+}
 
 void reset_displays(void) {
     // The SPI buses used by FourWires may be allocated on the heap so we need to move them inline.
@@ -168,23 +117,6 @@ void reset_displays(void) {
             continue;
         }
         displayio_display_obj_t* display = &displays[i].display;
-        common_hal_displayio_display_show(display, &splash);
-    }
-}
-
-void common_hal_displayio_release_displays(void) {
-    for (uint8_t i = 0; i < CIRCUITPY_DISPLAY_LIMIT; i++) {
-        mp_const_obj_t bus_type = displays[i].fourwire_bus.base.type;
-        if (bus_type == NULL) {
-            continue;
-        } else if (bus_type == &displayio_fourwire_type) {
-            common_hal_displayio_fourwire_deinit(&displays[i].fourwire_bus);
-        } else if (bus_type == &displayio_parallelbus_type) {
-            common_hal_displayio_parallelbus_deinit(&displays[i].parallel_bus);
-        }
-        displays[i].fourwire_bus.base.type = &mp_type_NoneType;
-    }
-    for (uint8_t i = 0; i < CIRCUITPY_DISPLAY_LIMIT; i++) {
-        displays[i].display.base.type = &mp_type_NoneType;
+        common_hal_displayio_display_show(display, &circuitpython_splash);
     }
 }
diff --git a/shared-module/displayio/__init__.h b/shared-module/displayio/__init__.h
index fdabd4ec4..5b56ed55c 100644
--- a/shared-module/displayio/__init__.h
+++ b/shared-module/displayio/__init__.h
@@ -29,6 +29,7 @@
 
 #include "shared-bindings/displayio/Display.h"
 #include "shared-bindings/displayio/FourWire.h"
+#include "shared-bindings/displayio/Group.h"
 #include "shared-bindings/displayio/ParallelBus.h"
 
 typedef struct {
@@ -41,6 +42,8 @@ typedef struct {
 
 extern primary_display_t displays[CIRCUITPY_DISPLAY_LIMIT];
 
+extern displayio_group_t circuitpython_splash;
+
 void displayio_refresh_displays(void);
 void reset_displays(void);
 
diff --git a/shared-module/terminalio/Terminal.c b/shared-module/terminalio/Terminal.c
index c47f9f6cf..1cd5d341e 100644
--- a/shared-module/terminalio/Terminal.c
+++ b/shared-module/terminalio/Terminal.c
@@ -28,7 +28,7 @@
 
 #include "shared-bindings/displayio/TileGrid.h"
 
-void common_hal_terminalio_terminal_construct(terminalio_terminal_obj_t *self, displayio_tilegrid_t* tilegrid, uint8_t* unicode_characters, uint16_t unicode_characters_len) {
+void common_hal_terminalio_terminal_construct(terminalio_terminal_obj_t *self, displayio_tilegrid_t* tilegrid, const uint8_t* unicode_characters, uint16_t unicode_characters_len) {
     self->cursor_x = 0;
     self->cursor_y = 0;
     self->tilegrid = tilegrid;
@@ -38,6 +38,7 @@ void common_hal_terminalio_terminal_construct(terminalio_terminal_obj_t *self, d
 
 size_t common_hal_terminalio_terminal_write(terminalio_terminal_obj_t *self, const byte *data, size_t len, int *errcode) {
     const byte* i = data;
+    uint16_t start_y = self->cursor_y;
     while (i < data + len) {
         unichar c = utf8_get_char(i);
         i = utf8_next_char(i);
@@ -51,6 +52,40 @@ size_t common_hal_terminalio_terminal_write(terminalio_terminal_obj_t *self, con
                 self->cursor_x = 0;
             } else if (c == '\n') {
                 self->cursor_y++;
+            // Commands below are used by MicroPython in the REPL
+            } else if (c == '\b') {
+                if (self->cursor_x > 0) {
+                    self->cursor_x--;
+                }
+            } else if (c == 0x1b) {
+                if (i[0] == '[') {
+                    if (i[1] == 'K') {
+                        // Clear the rest of the line.
+                        for (uint16_t j = self->cursor_x; j < self->tilegrid->width_in_tiles; j++) {
+                            common_hal_displayio_textgrid_set_tile(self->tilegrid, j, self->cursor_y, 0);
+                        }
+                        i += 2;
+                    } else {
+                        // Handle commands of the form \x1b[####D
+                        uint16_t n = 0;
+                        uint8_t j = 1;
+                        for (; j < 6; j++) {
+                            if ('0' <= i[j] && i[j] <= '9') {
+                                n = n * 10 + (i[j] - '0');
+                            } else {
+                                c = i[j];
+                            }
+                        }
+                        if (c == 'D') {
+                            if (n > self->cursor_x) {
+                                self->cursor_x = 0;
+                            } else {
+                                self->cursor_x -= n;
+                            }
+                            i += j;
+                        }
+                    }
+                }
             }
         } else {
             // Do a linear search of the mapping for unicode.
@@ -73,6 +108,13 @@ size_t common_hal_terminalio_terminal_write(terminalio_terminal_obj_t *self, con
         if (self->cursor_y >= self->tilegrid->height_in_tiles) {
             self->cursor_y %= self->tilegrid->height_in_tiles;
         }
+        if (self->cursor_y != start_y) {
+            // clear the new row
+            for (uint16_t j = 0; j < self->tilegrid->width_in_tiles; j++) {
+                common_hal_displayio_textgrid_set_tile(self->tilegrid, j, self->cursor_y, 0);
+                start_y = self->cursor_y;
+            }
+        }
     }
     return i - data;
 }
diff --git a/supervisor/memory.h b/supervisor/memory.h
index c89f14bd9..f557744ae 100755
--- a/supervisor/memory.h
+++ b/supervisor/memory.h
@@ -57,4 +57,7 @@ static inline uint16_t align32_size(uint16_t size) {
     return size;
 }
 
+// Called after the heap is freed in case the supervisor wants to save some values.
+void supervisor_move_memory(void);
+
 #endif  // MICROPY_INCLUDED_SUPERVISOR_MEMORY_H
diff --git a/supervisor/shared/display.c b/supervisor/shared/display.c
new file mode 100644
index 000000000..18693266f
--- /dev/null
+++ b/supervisor/shared/display.c
@@ -0,0 +1,177 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "supervisor/shared/display.h"
+
+#include <string.h>
+
+#include "py/mpstate.h"
+#include "shared-bindings/displayio/Group.h"
+#include "shared-bindings/displayio/Palette.h"
+#include "shared-bindings/displayio/Sprite.h"
+#include "supervisor/memory.h"
+
+extern uint32_t blinka_bitmap_data[];
+extern displayio_bitmap_t blinka_bitmap;
+extern displayio_group_t circuitpython_splash;
+
+static supervisor_allocation* tilegrid_tiles = NULL;
+
+void supervisor_start_terminal(uint16_t width_px, uint16_t height_px) {
+    displayio_tilegrid_t* grid = &supervisor_terminal_text_grid;
+    uint16_t width_in_tiles = (width_px - blinka_bitmap.width) / grid->tile_width;
+    // determine scale based on h
+    uint8_t scale = 1;
+    if (width_in_tiles > 80) {
+        scale = 2;
+    }
+    width_in_tiles = (width_px - blinka_bitmap.width * scale) / (grid->tile_width * scale);
+    uint16_t height_in_tiles = height_px / (grid->tile_height * scale);
+    circuitpython_splash.scale = scale;
+
+    uint16_t total_tiles = width_in_tiles * height_in_tiles;
+
+    // First try to allocate outside the heap. This will fail when the VM is running.
+    tilegrid_tiles = allocate_memory(total_tiles, false);
+    uint8_t* tiles;
+    if (tilegrid_tiles == NULL) {
+        tiles = m_malloc(total_tiles, true);
+        MP_STATE_VM(terminal_tilegrid_tiles) = tiles;
+    } else {
+        tiles = (uint8_t*) tilegrid_tiles->ptr;
+    }
+
+    if (tiles == NULL) {
+        return;
+    }
+
+    grid->width_in_tiles = width_in_tiles;
+    grid->height_in_tiles = height_in_tiles;
+    grid->total_width = width_in_tiles * grid->tile_width;
+    grid->total_height = height_in_tiles * grid->tile_height;
+    grid->tiles = tiles;
+
+    supervisor_terminal.cursor_x = 0;
+    supervisor_terminal.cursor_y = 0;
+}
+
+void supervisor_stop_terminal(void) {
+    if (tilegrid_tiles != NULL) {
+        free_memory(tilegrid_tiles);
+        supervisor_terminal_text_grid.inline_tiles = false;
+        supervisor_terminal_text_grid.tiles = NULL;
+    }
+}
+
+void supervisor_display_move_memory(void) {
+    displayio_tilegrid_t* grid = &supervisor_terminal_text_grid;
+    if (MP_STATE_VM(terminal_tilegrid_tiles) == NULL || grid->tiles != MP_STATE_VM(terminal_tilegrid_tiles)) {
+        return;
+    }
+    uint16_t total_tiles = grid->width_in_tiles * grid->height_in_tiles;
+
+    tilegrid_tiles = allocate_memory(total_tiles, false);
+    if (tilegrid_tiles != NULL) {
+        memcpy(tilegrid_tiles->ptr, grid->tiles, total_tiles);
+        grid->tiles = (uint8_t*) tilegrid_tiles->ptr;
+    } else {
+        grid->tiles = NULL;
+        grid->inline_tiles = false;
+    }
+    MP_STATE_VM(terminal_tilegrid_tiles) = NULL;
+}
+
+uint32_t blinka_bitmap_data[32] = {
+    0x00000011, 0x11000000,
+    0x00000111, 0x53100000,
+    0x00000111, 0x56110000,
+    0x00000111, 0x11140000,
+    0x00000111, 0x20002000,
+    0x00000011, 0x13000000,
+    0x00000001, 0x11200000,
+    0x00000000, 0x11330000,
+    0x00000000, 0x01122000,
+    0x00001111, 0x44133000,
+    0x00032323, 0x24112200,
+    0x00111114, 0x44113300,
+    0x00323232, 0x34112200,
+    0x11111144, 0x44443300,
+    0x11111111, 0x11144401,
+    0x23232323, 0x21111110
+};
+
+displayio_bitmap_t blinka_bitmap = {
+    .base = {.type = &displayio_bitmap_type },
+    .width = 16,
+    .height = 16,
+    .data = blinka_bitmap_data,
+    .stride = 2,
+    .bits_per_value = 4,
+    .x_shift = 3,
+    .x_mask = 0x7,
+    .bitmask = 0xf
+};
+
+uint32_t blinka_transparency[1] = {0x80000000};
+
+// These colors are RGB 565 with the bytes swapped.
+uint32_t blinka_colors[8] = {0x78890000, 0x9F86B8FC, 0xffff0D5A, 0x0000f501,
+                             0x00000000, 0x00000000, 0x00000000, 0x00000000};
+
+displayio_palette_t blinka_palette = {
+    .base = {.type = &displayio_palette_type },
+    .opaque = blinka_transparency,
+    .colors = blinka_colors,
+    .color_count = 16,
+    .needs_refresh = false
+};
+
+displayio_sprite_t blinka_sprite = {
+    .base = {.type = &displayio_sprite_type },
+    .bitmap = &blinka_bitmap,
+    .pixel_shader = &blinka_palette,
+    .x = 0,
+    .y = 0,
+    .width = 16,
+    .height = 16,
+    .needs_refresh = false
+};
+
+mp_obj_t splash_children[2] = {
+    &blinka_sprite,
+    &supervisor_terminal_text_grid
+};
+
+displayio_group_t circuitpython_splash = {
+    .base = {.type = &displayio_group_type },
+    .x = 0,
+    .y = 0,
+    .scale = 2,
+    .size = 2,
+    .max_size = 2,
+    .children = splash_children,
+    .needs_refresh = true
+};
diff --git a/supervisor/shared/display.h b/supervisor/shared/display.h
index 5c420e590..cca907916 100644
--- a/supervisor/shared/display.h
+++ b/supervisor/shared/display.h
@@ -28,8 +28,21 @@
 #define MICROPY_INCLUDED_SUPERVISOR_SHARED_DISPLAY_H
 
 #include "shared-bindings/displayio/Bitmap.h"
+#include "shared-bindings/displayio/TileGrid.h"
+#include "shared-bindings/terminalio/Terminal.h"
+
 // These are autogenerated resources.
 
-const displayio_bitmap_t terminal_font;
+// This is fixed so it doesn't need to be in RAM.
+extern const displayio_bitmap_t supervisor_terminal_font;
+
+// These will change so they must live in RAM.
+extern displayio_tilegrid_t supervisor_terminal_text_grid;
+extern terminalio_terminal_obj_t supervisor_terminal;
+
+void supervisor_start_terminal(uint16_t width_px, uint16_t height_px);
+void supervisor_stop_terminal(void);
+
+void supervisor_display_move_memory(void);
 
 #endif  // MICROPY_INCLUDED_SUPERVISOR_SHARED_DISPLAY_H
diff --git a/supervisor/shared/memory.c b/supervisor/shared/memory.c
index 6c8be3be8..11133415d 100755
--- a/supervisor/shared/memory.c
+++ b/supervisor/shared/memory.c
@@ -28,6 +28,8 @@
 
 #include <stddef.h>
 
+#include "supervisor/shared/display.h"
+
 #define CIRCUITPY_SUPERVISOR_ALLOC_COUNT 8
 
 static supervisor_allocation allocations[CIRCUITPY_SUPERVISOR_ALLOC_COUNT];
@@ -114,3 +116,7 @@ supervisor_allocation* allocate_memory(uint32_t length, bool high) {
     alloc->length = length;
     return alloc;
 }
+
+void supervisor_move_memory(void) {
+    supervisor_display_move_memory();
+}
diff --git a/supervisor/shared/serial.c b/supervisor/shared/serial.c
index c57688ddc..ac5239a84 100644
--- a/supervisor/shared/serial.c
+++ b/supervisor/shared/serial.c
@@ -26,6 +26,8 @@
 
 #include <string.h>
 
+#include "supervisor/shared/display.h"
+#include "shared-bindings/terminalio/Terminal.h"
 #include "supervisor/serial.h"
 #include "supervisor/usb.h"
 
@@ -48,6 +50,8 @@ bool serial_bytes_available(void) {
 }
 
 void serial_write_substring(const char* text, uint32_t length) {
+    int errcode;
+    common_hal_terminalio_terminal_write(&supervisor_terminal, (const uint8_t*) text, length, &errcode);
     if (!tud_cdc_connected()) {
         return;
     }
diff --git a/supervisor/supervisor.mk b/supervisor/supervisor.mk
index 174abd9d9..0e315a742 100644
--- a/supervisor/supervisor.mk
+++ b/supervisor/supervisor.mk
@@ -3,6 +3,7 @@ SRC_SUPERVISOR = \
 	supervisor/port.c \
 	supervisor/shared/autoreload.c \
 	supervisor/shared/board_busses.c \
+	supervisor/shared/display.c \
 	supervisor/shared/filesystem.c \
 	supervisor/shared/flash.c \
 	supervisor/shared/micropython.c \
@@ -91,7 +92,7 @@ autogen_usb_descriptor.intermediate: ../../tools/gen_usb_descriptor.py Makefile
 		--output_c_file $(BUILD)/autogen_usb_descriptor.c\
 		--output_h_file $(BUILD)/genhdr/autogen_usb_descriptor.h
 
-CIRCUITPY_DISPLAY_FONT = "fonts/test.bdf"
+CIRCUITPY_DISPLAY_FONT = "../../tools/Tecate-bitmap-fonts/bitmap/cherry/cherry-10-r.bdf"
 
 $(BUILD)/autogen_display_resources.c: ../../tools/gen_display_resources.py $(HEADER_BUILD)/qstrdefs.generated.h Makefile | $(HEADER_BUILD)
 	$(STEPECHO) "GEN $@"
diff --git a/tools/bitmap_font b/tools/bitmap_font
-Subproject 7320e8ff94312c791aeed1a6956f8640e1dddc6
+Subproject 62dd78abdd0b823824fe15d1bab0611246145c2
diff --git a/tools/gen_display_resources.py b/tools/gen_display_resources.py
index 3bcdc9952..27ea2a471 100644
--- a/tools/gen_display_resources.py
+++ b/tools/gen_display_resources.py
@@ -1,9 +1,11 @@
 import argparse
 
 import os
+import struct
 import sys
 
 sys.path.append("bitmap_font")
+sys.path.append("../../tools/bitmap_font")
 
 from adafruit_bitmap_font import bitmap_font
 
@@ -14,16 +16,6 @@ parser.add_argument('--output_c_file', type=argparse.FileType('w'), required=Tru
 
 args = parser.parse_args()
 
-args.font
-
-c_file = args.output_c_file
-
-c_file.write("""\
-
-#include "supervisor/shared/display.h"
-
-""")
-
 class BitmapStub:
     def __init__(self, width, height, color_depth):
         self.width = width
@@ -39,30 +31,140 @@ print(f.get_bounding_box())
 real_bb = [0, 0]
 
 visible_ascii = bytes(range(0x20, 0x7f)).decode("utf-8")
-all_characters = visible_ascii
+extra_characters = "üàêùéáçãÍóíαψ◌"
+all_characters = visible_ascii + extra_characters
+filtered_characters = all_characters
 for c in all_characters:
     g = f.get_glyph(ord(c))
+    if not g:
+        print("Font missing character:", c, ord(c))
+        filtered_characters = filtered_characters.replace(c, "")
+        extra_characters = extra_characters.replace(c, "")
+        continue
     x, y, dx, dy = g["bounds"]
-    print(c, g["bounds"], g["shift"])
+    #print(c, g["bounds"], g["shift"])
     if g["shift"][1] != 0:
         raise RuntimeError("y shift")
-    real_bb[0] = max(max(real_bb[0], x - dx), g["shift"][0])
+    real_bb[0] = max(real_bb[0], x - dx)
     real_bb[1] = max(real_bb[1], y - dy)
 
-real_bb[1] += 1
-print(real_bb)
+#real_bb[1] += 1
+#print(real_bb)
 
 tile_x, tile_y = real_bb
+total_bits = tile_x * len(all_characters)
+total_bits += 32 - total_bits % 32
+bytes_per_row = total_bits // 8
+b = bytearray(bytes_per_row * tile_y)
 
-for c in all_characters:
+for x, c in enumerate(filtered_characters):
     g = f.get_glyph(ord(c))
-    #print(c, g["bounds"], g["shift"])
-    for row in g["bitmap"].rows:
+    start_bit = x * tile_x + g["bounds"][2]
+    start_y = (tile_y - 2) - (g["bounds"][1] + g["bounds"][3])
+    # print(c, g["bounds"], g["shift"], tile_y, start_y)
+    for y, row in enumerate(g["bitmap"].rows):
         for i in range(g["bounds"][0]):
             byte = i // 8
             bit = i % 8
-            # if row[byte] & (1 << (7-bit)) != 0:
-            #     print("*",end="")
+            if row[byte] & (1 << (7-bit)) != 0:
+                overall_bit = start_bit + (start_y + y) * bytes_per_row * 8 + i
+                b[overall_bit // 8] |= 1 << (7 - (overall_bit % 8))
+                # print("*",end="")
             # else:
             #     print("_",end="")
         #print()
+
+# print(b)
+# print("tile_x = {}".format(tile_x))
+# print("tile_y = {}".format(tile_y))
+# print("tiles = {}".format(len(all_characters)))
+# print("font = displayio.Bitmap(tile_x * tiles, tile_y, 2)")
+# for row in range(tile_y):
+#     print("font._load_row({}, {})".format(row, bytes(b[row*bytes_per_row:row*bytes_per_row+bytes_per_row])))
+
+# for row in range(tile_y):
+#     for byte in b[row*bytes_per_row:row*bytes_per_row+bytes_per_row]:
+#         print("{:08b} ".format(byte),end="")
+#     print()
+
+c_file = args.output_c_file
+
+c_file.write("""\
+
+#include "shared-bindings/displayio/Palette.h"
+#include "supervisor/shared/display.h"
+
+""")
+
+c_file.write("""\
+uint32_t terminal_transparency[1] = {0x00000000};
+
+// These colors are RGB 565 with the bytes swapped.
+uint32_t terminal_colors[1] = {0xffff0000};
+
+displayio_palette_t supervisor_terminal_color = {
+    .base = {.type = &displayio_palette_type },
+    .opaque = terminal_transparency,
+    .colors = terminal_colors,
+    .color_count = 2,
+    .needs_refresh = false
+};
+""")
+
+c_file.write("""\
+displayio_tilegrid_t supervisor_terminal_text_grid = {{
+    .base = {{ .type = &displayio_tilegrid_type }},
+    .bitmap = (displayio_bitmap_t*) &supervisor_terminal_font,
+    .pixel_shader = &supervisor_terminal_color,
+    .x = 16,
+    .y = 0,
+    .bitmap_width_in_tiles = {0},
+    .width_in_tiles = 1,
+    .height_in_tiles = 1,
+    .total_width = {1},
+    .total_height = {2},
+    .tile_width = {1},
+    .tile_height = {2},
+    .tiles = NULL,
+    .needs_refresh = false,
+    .inline_tiles = false
+}};
+""".format(len(all_characters), tile_x, tile_y))
+
+c_file.write("""\
+const uint32_t font_bitmap_data[{}] = {{
+""".format(bytes_per_row * tile_y // 4))
+
+for i, word in enumerate(struct.iter_unpack(">I", b)):
+    c_file.write("0x{:08x}, ".format(word[0]))
+    if (i + 1) % (bytes_per_row // 4) == 0:
+        c_file.write("\n")
+
+c_file.write("""\
+};
+""")
+
+c_file.write("""\
+const displayio_bitmap_t supervisor_terminal_font = {{
+    .base = {{.type = &displayio_bitmap_type }},
+    .width = {},
+    .height = {},
+    .data = (uint32_t*) font_bitmap_data,
+    .stride = {},
+    .bits_per_value = 1,
+    .x_shift = 5,
+    .x_mask = 0x1f,
+    .bitmask = 0x1
+}};
+""".format(len(all_characters) * tile_x, tile_y, bytes_per_row / 4))
+
+c_file.write("""\
+terminalio_terminal_obj_t supervisor_terminal = {{
+    .base = {{.type = &terminalio_terminal_type }},
+    .cursor_x = 0,
+    .cursor_y = 0,
+    .tilegrid = &supervisor_terminal_text_grid,
+    .unicode_characters = (const uint8_t*) "{}",
+    .unicode_characters_len = {}
+}};
+""".format(extra_characters, len(extra_characters.encode("utf-8"))))