Added option to allow Displays with Single Byte Boundaries

ports/atmel-samd/boards/hallowing_m0_express/board.c

@@ -93,7 +93,8 @@ void board_init(void) {
         0x37, // set vertical scroll command
         display_init_sequence,
         sizeof(display_init_sequence),
-        &pin_PA00);
+        &pin_PA00,
+        false); // single_byte_bounds
     common_hal_displayio_display_set_auto_brightness(display, true);
 }
 

ports/atmel-samd/boards/pybadge/board.c

@@ -99,7 +99,8 @@ void board_init(void) {
         0x37, // set vertical scroll command
         display_init_sequence,
         sizeof(display_init_sequence),
-        &pin_PA00);
+        &pin_PA00,
+        false); // single_byte_bounds
     common_hal_displayio_display_set_auto_brightness(display, true);
 }
 

ports/atmel-samd/boards/pyportal/board.c

@@ -90,7 +90,9 @@ void board_init(void) {
         0x37, // Set vertical scroll command
         display_init_sequence,
         sizeof(display_init_sequence),
-        &pin_PB31);
+        &pin_PB31,
+        false); // single_byte_bounds
+
     common_hal_displayio_display_set_auto_brightness(display, true);
 }
 

shared-bindings/displayio/Display.c

@@ -50,7 +50,7 @@
 //| Most people should not use this class directly. Use a specific display driver instead that will
 //| contain the initialization sequence at minimum.
 //|
-//| .. class:: Display(display_bus, init_sequence, *, width, height, colstart=0, rowstart=0, rotation=0, color_depth=16, set_column_command=0x2a, set_row_command=0x2b, write_ram_command=0x2c, set_vertical_scroll=0, backlight_pin=None)
+//| .. class:: Display(display_bus, init_sequence, *, width, height, colstart=0, rowstart=0, rotation=0, color_depth=16, set_column_command=0x2a, set_row_command=0x2b, write_ram_command=0x2c, set_vertical_scroll=0, backlight_pin=None, single_byte_bounds=False)
 //|
 //|   Create a Display object on the given display bus (`displayio.FourWire` or `displayio.ParallelBus`).
 //|
@@ -91,9 +91,10 @@
 //|   :param int write_ram_command: Command used to write pixels values into the update region
 //|   :param int set_vertical_scroll: Command used to set the first row to show
 //|   :param microcontroller.Pin backlight_pin: Pin connected to the display's backlight
+//|   :param bool single_byte_bounds: Display column and row commands use single bytes
 //|
 STATIC mp_obj_t displayio_display_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
-    enum { ARG_display_bus, ARG_init_sequence, ARG_width, ARG_height, ARG_colstart, ARG_rowstart, ARG_rotation, ARG_color_depth, ARG_set_column_command, ARG_set_row_command, ARG_write_ram_command, ARG_set_vertical_scroll, ARG_backlight_pin };
+    enum { ARG_display_bus, ARG_init_sequence, ARG_width, ARG_height, ARG_colstart, ARG_rowstart, ARG_rotation, ARG_color_depth, ARG_set_column_command, ARG_set_row_command, ARG_write_ram_command, ARG_set_vertical_scroll, ARG_backlight_pin, ARG_single_byte_bounds };
     static const mp_arg_t allowed_args[] = {
         { MP_QSTR_display_bus, MP_ARG_REQUIRED | MP_ARG_OBJ },
         { MP_QSTR_init_sequence, MP_ARG_REQUIRED | MP_ARG_OBJ },
@@ -108,6 +109,7 @@ STATIC mp_obj_t displayio_display_make_new(const mp_obj_type_t *type, size_t n_a
         { MP_QSTR_write_ram_command, MP_ARG_INT | MP_ARG_KW_ONLY, {.u_int = 0x2c} },
         { MP_QSTR_set_vertical_scroll, MP_ARG_INT | MP_ARG_KW_ONLY, {.u_int = 0x0} },
         { MP_QSTR_backlight_pin, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_obj = mp_const_none} },
+        { MP_QSTR_single_byte_bounds, MP_ARG_BOOL | MP_ARG_KW_ONLY, {.u_bool = false} },
     };
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
     mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
@@ -146,7 +148,8 @@ STATIC mp_obj_t displayio_display_make_new(const mp_obj_type_t *type, size_t n_a
             args[ARG_color_depth].u_int, args[ARG_set_column_command].u_int, args[ARG_set_row_command].u_int,
             args[ARG_write_ram_command].u_int,
             args[ARG_set_vertical_scroll].u_int,
-            bufinfo.buf, bufinfo.len, MP_OBJ_TO_PTR(backlight_pin));
+            bufinfo.buf, bufinfo.len, MP_OBJ_TO_PTR(backlight_pin),
+            args[ARG_single_byte_bounds].u_bool);
 
     return self;
 }

shared-bindings/displayio/Display.h

@@ -40,7 +40,7 @@ void common_hal_displayio_display_construct(displayio_display_obj_t* self,
     mp_obj_t bus, uint16_t width, uint16_t height,
     int16_t colstart, int16_t rowstart, uint16_t rotation, uint16_t color_depth,
     uint8_t set_column_command, uint8_t set_row_command, uint8_t write_ram_command, uint8_t set_vertical_scroll,
-    uint8_t* init_sequence, uint16_t init_sequence_len, const mcu_pin_obj_t* backlight_pin);
+    uint8_t* init_sequence, uint16_t init_sequence_len, const mcu_pin_obj_t* backlight_pin, bool single_byte_bounds);
 
 int32_t common_hal_displayio_display_wait_for_frame(displayio_display_obj_t* self);
 

shared-module/displayio/Display.c

@@ -44,7 +44,7 @@ void common_hal_displayio_display_construct(displayio_display_obj_t* self,
         mp_obj_t bus, uint16_t width, uint16_t height, int16_t colstart, int16_t rowstart, uint16_t rotation,
         uint16_t color_depth, uint8_t set_column_command, uint8_t set_row_command,
         uint8_t write_ram_command, uint8_t set_vertical_scroll, uint8_t* init_sequence, uint16_t init_sequence_len,
-        const mcu_pin_obj_t* backlight_pin) {
+        const mcu_pin_obj_t* backlight_pin, bool single_byte_bounds) {
     self->color_depth = color_depth;
     self->set_column_command = set_column_command;
     self->set_row_command = set_row_command;
@@ -54,6 +54,7 @@ void common_hal_displayio_display_construct(displayio_display_obj_t* self,
     self->colstart = colstart;
     self->rowstart = rowstart;
     self->auto_brightness = false;
+    self->single_byte_bounds = single_byte_bounds;
 
     if (MP_OBJ_IS_TYPE(bus, &displayio_parallelbus_type)) {
         self->begin_transaction = common_hal_displayio_parallelbus_begin_transaction;
@@ -211,16 +212,25 @@ void displayio_display_end_transaction(displayio_display_obj_t* self) {
 }
 
 void displayio_display_set_region_to_update(displayio_display_obj_t* self, uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1) {
-    // TODO(tannewt): Handle displays with single byte bounds.
     uint16_t data[2];
     self->send(self->bus, true, &self->set_column_command, 1);
-    data[0] = __builtin_bswap16(x0 + self->colstart);
-    data[1] = __builtin_bswap16(x1 - 1 + self->colstart);
-    self->send(self->bus, false, (uint8_t*) data, 4);
+    if (self->single_byte_bounds) {
+        data[0] = __builtin_bswap16(((x0 + self->colstart) << 8) | ((x1 - 1 + self->colstart) & 0xFF));
+        self->send(self->bus, false, (uint8_t*) data, 2);
+    } else {
+        data[0] = __builtin_bswap16(x0 + self->colstart);
+        data[1] = __builtin_bswap16(x1 - 1 + self->colstart);
+        self->send(self->bus, false, (uint8_t*) data, 4);
+    }
     self->send(self->bus, true, &self->set_row_command, 1);
-    data[0] = __builtin_bswap16(y0  + self->rowstart);
-    data[1] = __builtin_bswap16(y1 - 1 + self->rowstart);
-    self->send(self->bus, false, (uint8_t*) data, 4);
+    if (self->single_byte_bounds) {
+        data[0] = __builtin_bswap16(((y0 + self->rowstart) << 8) | ((y1 - 1 + self->rowstart) & 0xFF));
+        self->send(self->bus, false, (uint8_t*) data, 2);
+    } else {
+        data[0] = __builtin_bswap16(y0  + self->rowstart);
+        data[1] = __builtin_bswap16(y1 - 1 + self->rowstart);
+        self->send(self->bus, false, (uint8_t*) data, 4);
+    }
     self->send(self->bus, true, &self->write_ram_command, 1);
 }
 

shared-module/displayio/Display.h

@@ -49,6 +49,7 @@ typedef struct {
     uint64_t last_refresh;
     int16_t colstart;
     int16_t rowstart;
+    bool single_byte_bounds;
     display_bus_begin_transaction begin_transaction;
     display_bus_send send;
     display_bus_end_transaction end_transaction;