add display support; rotation 270

Author: dhalbert

ports/nrf/boards/clue_nrf52840_express/board.c

@@ -25,12 +25,74 @@
  */
 
 #include "boards/board.h"
+#include "mpconfigboard.h"
+
+#include "shared-bindings/busio/SPI.h"
+#include "shared-bindings/displayio/FourWire.h"
+#include "shared-module/displayio/__init__.h"
+#include "shared-module/displayio/mipi_constants.h"
+#include "tick.h"
+
+displayio_fourwire_obj_t board_display_obj;
+
+#define DELAY 0x80
+
+uint8_t display_init_sequence[] = {
+    0x01, 0 | DELAY, 150, // SWRESET
+    0x11, 0 | DELAY, 255, // SLPOUT
+    0x36, 1, 0x00,        // _MADCTL bottom to top refresh in vsync aligned order.
+    0x3a, 1, 0x55, // COLMOD - 16bit color
+    0x21, 0 | DELAY, 10,                 // _INVON
+    0x13, 0 | DELAY, 10,                 // _NORON
+    0x29, 0 | DELAY, 255,                // _DISPON
+};
 
 void board_init(void) {
+    busio_spi_obj_t* spi = &displays[0].fourwire_bus.inline_bus;
+    common_hal_busio_spi_construct(spi, &pin_P0_14, &pin_P0_15, NULL);
+    common_hal_busio_spi_never_reset(spi);
+
+    displayio_fourwire_obj_t* bus = &displays[0].fourwire_bus;
+    bus->base.type = &displayio_fourwire_type;
+    common_hal_displayio_fourwire_construct(bus,
+        spi,
+        &pin_P0_13, // TFT_DC Command or data
+        &pin_P0_12, // TFT_CS Chip select
+        &pin_P1_03, // TFT_RST Reset
+        60000000);
+
+    displayio_display_obj_t* display = &displays[0].display;
+    display->base.type = &displayio_display_type;
+    common_hal_displayio_display_construct(display,
+        bus,
+        240, // Width (after rotation)
+        240, // Height (after rotation)
+        0, // column start
+        0, // row start
+        270, // rotation
+        16, // Color depth
+        false, // Grayscale
+        false, // Pixels in a byte share a row. Only used for depth < 8
+        1, // bytes per cell. Only valid for depths < 8
+        false, // reverse_pixels_in_byte. Only valid for depths < 8
+        MIPI_COMMAND_SET_COLUMN_ADDRESS, // Set column command
+        MIPI_COMMAND_SET_PAGE_ADDRESS, // Set row command
+        MIPI_COMMAND_WRITE_MEMORY_START, // Write memory command
+        0x37, // set vertical scroll command
+        display_init_sequence,
+        sizeof(display_init_sequence),
+        &pin_P1_05,  // backlight pin
+        NO_BRIGHTNESS_COMMAND,
+        1.0f, // brightness (ignored)
+        true, // auto_brightness
+        false, // single_byte_bounds
+        false, // data_as_commands
+        true, // auto_refresh
+        60); // native_frames_per_second
 }
 
 bool board_requests_safe_mode(void) {
-  return false;
+    return false;
 }
 
 void reset_board(void) {