Merge pull request #4124 from m4tk/main

Add display init code for Lilygo TTGO T8 ESP32-S2

Author: tannewt

ports/esp32s2/boards/lilygo_ttgo_t8_s2_st7789/board.c

@@ -27,6 +27,109 @@
 #include "supervisor/board.h"
 #include "mpconfigboard.h"
 #include "shared-bindings/microcontroller/Pin.h"
+#include "shared-module/displayio/__init__.h"
+#include "shared-module/displayio/mipi_constants.h"
+
+#define DELAY 0x80
+
+// display init sequence according to LilyGO example app
+uint8_t display_init_sequence[] = {
+    // sw reset
+    0x01, 0 | DELAY, 150,
+    // sleep out
+    0x11, 0 | DELAY, 255,
+    // normal display mode on
+    0x13, 0,
+    // display and color format settings
+    0x36, 1, 0x08,
+    0xB6, 2, 0x0A, 0x82,
+    0x3A, 1 | DELAY,  0x55, 10,
+    // ST7789V frame rate setting
+    0xB2, 5, 0x0C, 0x0C, 0x00, 0x33, 0x33,
+    // voltages: VGH / VGL
+    0xB7, 1, 0x35,
+    // ST7789V power setting
+    0xBB, 1, 0x28,
+    0xC0, 1, 0x0C,
+    0xC2, 2, 0x01, 0xFF,
+    0xC3, 1, 0x10,
+    0xC4, 1, 0x20,
+    0xC6, 1, 0x0F,
+    0xD0, 2, 0xA4, 0xA1,
+    // ST7789V gamma setting
+    0xE0, 14, 0xD0, 0x00, 0x02, 0x07, 0x0A, 0x28, 0x32, 0x44, 0x42, 0x06, 0x0E, 0x12, 0x14, 0x17,
+    0xE1, 14, 0xD0, 0x00, 0x02, 0x07, 0x0A, 0x28, 0x31, 0x54, 0x47, 0x0E, 0x1C, 0x17, 0x1B, 0x1E,
+    0x21, 0,
+    // display on
+    0x29, 0 | DELAY, 255,
+ };
+
+static void display_init(void) {
+    busio_spi_obj_t* spi = &displays[0].fourwire_bus.inline_bus;
+
+    common_hal_busio_spi_construct(
+        spi,
+        &pin_GPIO36,    // CLK
+        &pin_GPIO35,    // MOSI
+        NULL            // MISO not connected
+    );
+
+    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_GPIO37,    // DC
+        &pin_GPIO34,    // CS
+        &pin_GPIO38,    // RST
+        40000000,       // baudrate
+        0,              // polarity
+        0               // phase
+    );
+
+    displayio_display_obj_t* display = &displays[0].display;
+    display->base.type = &displayio_display_type;
+
+    // workaround as board_init() is called before reset_port() in main.c
+    pwmout_reset();
+
+    common_hal_displayio_display_construct(
+        display,
+        bus,
+        240,            // width (after rotation)
+        135,            // height (after rotation)
+        52,             // column start
+        40,             // row start
+        90,             // rotation
+        16,             // color depth
+        false,          // grayscale
+        false,          // pixels in a byte share a row. Only valid for depths < 8
+        1,              // bytes per cell. Only valid for depths < 8
+        false,          // reverse_pixels_in_byte. Only valid for depths < 8
+        true,           // reverse_pixels_in_word
+        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_GPIO33,    // backlight pin
+        NO_BRIGHTNESS_COMMAND,
+        1.0f,           // brightness (ignored)
+        false,          // auto_brightness
+        false,          // single_byte_bounds
+        false,          // data_as_commands
+        true,           // auto_refresh
+        60,             // native_frames_per_second
+        true,           // backlight_on_high
+        false           // SH1107_addressing
+    );
+
+    common_hal_never_reset_pin(&pin_GPIO33); // backlight pin
+}
 
 void board_init(void) {
     // USB
@@ -38,6 +141,9 @@ void board_init(void) {
     common_hal_never_reset_pin(&pin_GPIO43);
     common_hal_never_reset_pin(&pin_GPIO44);
 #endif /* DEBUG */
+
+    // Display
+    display_init();
 }
 
 bool board_requests_safe_mode(void) {

ports/esp32s2/boards/lilygo_ttgo_t8_s2_st7789/pins.c

@@ -1,4 +1,5 @@
 #include "shared-bindings/board/__init__.h"
+#include "shared-module/displayio/__init__.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_IO0), MP_ROM_PTR(&pin_GPIO0) },
@@ -41,13 +42,13 @@ STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_SD_CS), MP_ROM_PTR(&pin_GPIO10) },
 
     // 1.14 inch LCD ST7789
-    { MP_ROM_QSTR(MP_QSTR_LCD_MISO), MP_ROM_PTR(&pin_GPIO4) },
     { MP_ROM_QSTR(MP_QSTR_LCD_MOSI), MP_ROM_PTR(&pin_GPIO35) },
     { MP_ROM_QSTR(MP_QSTR_LCD_CLK), MP_ROM_PTR(&pin_GPIO36) },
     { MP_ROM_QSTR(MP_QSTR_LCD_CS), MP_ROM_PTR(&pin_GPIO34) },
     { MP_ROM_QSTR(MP_QSTR_LCD_RST), MP_ROM_PTR(&pin_GPIO38) },
     { MP_ROM_QSTR(MP_QSTR_LCD_BCKL), MP_ROM_PTR(&pin_GPIO33) },
     { MP_ROM_QSTR(MP_QSTR_LCD_D_C), MP_ROM_PTR(&pin_GPIO37) },
+    { MP_ROM_QSTR(MP_QSTR_DISPLAY), MP_ROM_PTR(&displays[0].display) },
 
     // Peripheral Power control
     { MP_ROM_QSTR(MP_QSTR_PE_POWER), MP_ROM_PTR(&pin_GPIO14) },