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wip: initial scaffold based on plasma2350 + https://github.com/pimoroni/explorer/tree/main/explorer 
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‎ports/raspberrypi/boards/pimoroni_explorer2350/board.c‎

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// This file is part of the CircuitPython project: https://circuitpython.org
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//
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// SPDX-FileCopyrightText: Copyright (c) 2021 Scott Shawcroft for Adafruit Industries
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//
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// SPDX-License-Identifier: MIT
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#include "supervisor/board.h"
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#include "mpconfigboard.h"
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#include "shared-bindings/microcontroller/Pin.h"
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#include "shared-module/displayio/__init__.h"
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#include "shared-module/displayio/mipi_constants.h"
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#define DELAY 0x80
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// ST7789V display init sequence for 320x240
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uint8_t display_init_sequence[] = {
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// sw reset
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0x01, 0 | DELAY, 150,
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// sleep out
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0x11, 0 | DELAY, 255,
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// colmod 16-bit color
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0x3A, 1 | DELAY, 0x55, 10,
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// inversion on
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0x21, 0 | DELAY, 10,
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// normal display mode on
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0x13, 0 | DELAY, 10,
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// MADCTL: row/column addressing order and RGB/BGR
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0x36, 1, 0x00,
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// display on
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0x29, 0 | DELAY, 255,
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};
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static void display_init(void) {
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paralleldisplaybus_parallelbus_obj_t *bus = &allocate_display_bus()->parallel_bus;
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bus->base.type = &paralleldisplaybus_parallelbus_type;
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common_hal_paralleldisplaybus_parallelbus_construct(bus,
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&pin_GPIO29, // Data0 (DB0) - data pins must be sequential GPIO29-36
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&pin_GPIO26, // Command/Data (DC)
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&pin_GPIO11, // Chip select (CS)
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&pin_GPIO27, // Write (WR)
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&pin_GPIO28, // Read (RD)
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NULL, // Reset (directly connected to board reset or not exposed)
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15000000); // Frequency - ST7789 min clock cycle ~66ns = ~15MHz
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busdisplay_busdisplay_obj_t *display = &allocate_display()->display;
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display->base.type = &busdisplay_busdisplay_type;
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common_hal_busdisplay_busdisplay_construct(display,
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bus,
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320, // Width
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240, // Height
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0, // column start
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0, // row start
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0, // rotation
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16, // Color depth
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false, // grayscale
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false, // pixels_in_byte_share_row
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1, // bytes per cell
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false, // reverse_pixels_in_byte
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true, // reverse_pixels_in_word
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MIPI_COMMAND_SET_COLUMN_ADDRESS, // set column command
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MIPI_COMMAND_SET_PAGE_ADDRESS, // set row command
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MIPI_COMMAND_WRITE_MEMORY_START, // write memory command
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display_init_sequence,
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sizeof(display_init_sequence),
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&pin_GPIO10, // Backlight pin (LCD_BL)
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NO_BRIGHTNESS_COMMAND,
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1.0f, // brightness
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false, // single_byte_bounds
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false, // data_as_commands
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true, // auto_refresh
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60, // native_frames_per_second
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true, // backlight_on_high
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false, // SH1107_addressing
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50000 // backlight pwm frequency
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);
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}
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void board_init(void) {
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display_init();
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}
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// Use the MP_WEAK supervisor/shared/board.c versions of routines not defined here.

‎ports/raspberrypi/boards/pimoroni_explorer2350/mpconfigboard.h‎

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// This file is part of the CircuitPython project: https://circuitpython.org
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//
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// SPDX-FileCopyrightText: Copyright (c) 2024 Scott Shawcroft for Adafruit Industries
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//
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// SPDX-License-Identifier: MIT
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#pragma once
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#define MICROPY_HW_BOARD_NAME "Pimoroni Explorer"
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#define MICROPY_HW_MCU_NAME "rp2350b"
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#define MICROPY_HW_LED_STATUS (&pin_GPIO25)
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#define CIRCUITPY_BOARD_I2C (1)
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#define CIRCUITPY_BOARD_I2C_PIN {{.scl = &pin_GPIO21, .sda = &pin_GPIO20}}
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#define DEFAULT_UART_BUS_RX (&pin_GPIO1)
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#define DEFAULT_UART_BUS_TX (&pin_GPIO0)

‎ports/raspberrypi/boards/pimoroni_explorer2350/mpconfigboard.mk‎

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USB_VID = 0x2E8A
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USB_PID = 0x10C0
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USB_PRODUCT = "Explorer"
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USB_MANUFACTURER = "Pimoroni"
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CHIP_VARIANT = RP2350
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CHIP_PACKAGE = B
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CHIP_FAMILY = rp2
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EXTERNAL_FLASH_DEVICES = "W25Q128JVxQ"
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CIRCUITPY__EVE = 1

‎ports/raspberrypi/boards/pimoroni_explorer2350/pico-sdk-configboard.h‎

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// This file is part of the CircuitPython project: https://circuitpython.org
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//
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// SPDX-FileCopyrightText: Copyright (c) 2021 Scott Shawcroft for Adafruit Industries
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//
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// SPDX-License-Identifier: MIT
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// Put board-specific pico-sdk definitions here. This file must exist.

‎ports/raspberrypi/boards/pimoroni_explorer2350/pins.c‎

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// This file is part of the CircuitPython project: https://circuitpython.org
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//
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// SPDX-FileCopyrightText: Copyright (c) 2024 Scott Shawcroft for Adafruit Industries
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//
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// SPDX-License-Identifier: MIT
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#include "shared-bindings/board/__init__.h"
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#include "shared-module/displayio/__init__.h"
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static const mp_rom_map_elem_t board_module_globals_table[] = {
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CIRCUITPYTHON_BOARD_DICT_STANDARD_ITEMS
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// User GPIOs (accent connector)
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{ MP_ROM_QSTR(MP_QSTR_GP0), MP_ROM_PTR(&pin_GPIO0) },
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{ MP_ROM_QSTR(MP_QSTR_GPIO0), MP_ROM_PTR(&pin_GPIO0) },
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{ MP_ROM_QSTR(MP_QSTR_TX), MP_ROM_PTR(&pin_GPIO0) },
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{ MP_ROM_QSTR(MP_QSTR_GP1), MP_ROM_PTR(&pin_GPIO1) },
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{ MP_ROM_QSTR(MP_QSTR_GPIO1), MP_ROM_PTR(&pin_GPIO1) },
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{ MP_ROM_QSTR(MP_QSTR_RX), MP_ROM_PTR(&pin_GPIO1) },
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{ MP_ROM_QSTR(MP_QSTR_GP2), MP_ROM_PTR(&pin_GPIO2) },
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{ MP_ROM_QSTR(MP_QSTR_GPIO2), MP_ROM_PTR(&pin_GPIO2) },
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{ MP_ROM_QSTR(MP_QSTR_GP3), MP_ROM_PTR(&pin_GPIO3) },
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{ MP_ROM_QSTR(MP_QSTR_GPIO3), MP_ROM_PTR(&pin_GPIO3) },
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{ MP_ROM_QSTR(MP_QSTR_GP4), MP_ROM_PTR(&pin_GPIO4) },
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{ MP_ROM_QSTR(MP_QSTR_GPIO4), MP_ROM_PTR(&pin_GPIO4) },
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{ MP_ROM_QSTR(MP_QSTR_GP5), MP_ROM_PTR(&pin_GPIO5) },
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{ MP_ROM_QSTR(MP_QSTR_GPIO5), MP_ROM_PTR(&pin_GPIO5) },
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// Servo pins
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{ MP_ROM_QSTR(MP_QSTR_SERVO1), MP_ROM_PTR(&pin_GPIO9) },
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{ MP_ROM_QSTR(MP_QSTR_GP9), MP_ROM_PTR(&pin_GPIO9) },
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{ MP_ROM_QSTR(MP_QSTR_SERVO2), MP_ROM_PTR(&pin_GPIO8) },
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{ MP_ROM_QSTR(MP_QSTR_GP8), MP_ROM_PTR(&pin_GPIO8) },
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{ MP_ROM_QSTR(MP_QSTR_SERVO3), MP_ROM_PTR(&pin_GPIO7) },
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{ MP_ROM_QSTR(MP_QSTR_GP7), MP_ROM_PTR(&pin_GPIO7) },
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{ MP_ROM_QSTR(MP_QSTR_SERVO4), MP_ROM_PTR(&pin_GPIO6) },
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{ MP_ROM_QSTR(MP_QSTR_GP6), MP_ROM_PTR(&pin_GPIO6) },
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// Audio
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{ MP_ROM_QSTR(MP_QSTR_GP12), MP_ROM_PTR(&pin_GPIO12) },
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{ MP_ROM_QSTR(MP_QSTR_AUDIO), MP_ROM_PTR(&pin_GPIO12) },
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{ MP_ROM_QSTR(MP_QSTR_GP13), MP_ROM_PTR(&pin_GPIO13) },
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{ MP_ROM_QSTR(MP_QSTR_AMP_EN), MP_ROM_PTR(&pin_GPIO13) },
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// Buttons
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{ MP_ROM_QSTR(MP_QSTR_GP14), MP_ROM_PTR(&pin_GPIO14) },
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{ MP_ROM_QSTR(MP_QSTR_SW_C), MP_ROM_PTR(&pin_GPIO14) },
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{ MP_ROM_QSTR(MP_QSTR_GP15), MP_ROM_PTR(&pin_GPIO15) },
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{ MP_ROM_QSTR(MP_QSTR_SW_B), MP_ROM_PTR(&pin_GPIO15) },
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{ MP_ROM_QSTR(MP_QSTR_GP16), MP_ROM_PTR(&pin_GPIO16) },
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{ MP_ROM_QSTR(MP_QSTR_SW_A), MP_ROM_PTR(&pin_GPIO16) },
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{ MP_ROM_QSTR(MP_QSTR_GP17), MP_ROM_PTR(&pin_GPIO17) },
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{ MP_ROM_QSTR(MP_QSTR_SW_X), MP_ROM_PTR(&pin_GPIO17) },
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{ MP_ROM_QSTR(MP_QSTR_GP18), MP_ROM_PTR(&pin_GPIO18) },
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{ MP_ROM_QSTR(MP_QSTR_SW_Y), MP_ROM_PTR(&pin_GPIO18) },
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{ MP_ROM_QSTR(MP_QSTR_GP19), MP_ROM_PTR(&pin_GPIO19) },
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{ MP_ROM_QSTR(MP_QSTR_SW_Z), MP_ROM_PTR(&pin_GPIO19) },
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// I2C
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{ MP_ROM_QSTR(MP_QSTR_GP20), MP_ROM_PTR(&pin_GPIO20) },
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{ MP_ROM_QSTR(MP_QSTR_SDA), MP_ROM_PTR(&pin_GPIO20) },
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{ MP_ROM_QSTR(MP_QSTR_GP21), MP_ROM_PTR(&pin_GPIO21) },
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{ MP_ROM_QSTR(MP_QSTR_SCL), MP_ROM_PTR(&pin_GPIO21) },
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// User button
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{ MP_ROM_QSTR(MP_QSTR_GP22), MP_ROM_PTR(&pin_GPIO22) },
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{ MP_ROM_QSTR(MP_QSTR_SW_USER), MP_ROM_PTR(&pin_GPIO22) },
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// LED
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{ MP_ROM_QSTR(MP_QSTR_GP25), MP_ROM_PTR(&pin_GPIO25) },
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{ MP_ROM_QSTR(MP_QSTR_LED), MP_ROM_PTR(&pin_GPIO25) },
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// Display parallel bus pins (ST7789V 320x240)
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{ MP_ROM_QSTR(MP_QSTR_LCD_BL), MP_ROM_PTR(&pin_GPIO10) },
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{ MP_ROM_QSTR(MP_QSTR_GP10), MP_ROM_PTR(&pin_GPIO10) },
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{ MP_ROM_QSTR(MP_QSTR_LCD_CS), MP_ROM_PTR(&pin_GPIO11) },
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{ MP_ROM_QSTR(MP_QSTR_GP11), MP_ROM_PTR(&pin_GPIO11) },
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{ MP_ROM_QSTR(MP_QSTR_LCD_DC), MP_ROM_PTR(&pin_GPIO26) },
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{ MP_ROM_QSTR(MP_QSTR_GP26), MP_ROM_PTR(&pin_GPIO26) },
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{ MP_ROM_QSTR(MP_QSTR_LCD_WR), MP_ROM_PTR(&pin_GPIO27) },
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{ MP_ROM_QSTR(MP_QSTR_GP27), MP_ROM_PTR(&pin_GPIO27) },
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{ MP_ROM_QSTR(MP_QSTR_LCD_RD), MP_ROM_PTR(&pin_GPIO28) },
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{ MP_ROM_QSTR(MP_QSTR_GP28), MP_ROM_PTR(&pin_GPIO28) },
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{ MP_ROM_QSTR(MP_QSTR_LCD_DB0), MP_ROM_PTR(&pin_GPIO29) },
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{ MP_ROM_QSTR(MP_QSTR_GP29), MP_ROM_PTR(&pin_GPIO29) },
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{ MP_ROM_QSTR(MP_QSTR_LCD_DB1), MP_ROM_PTR(&pin_GPIO30) },
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{ MP_ROM_QSTR(MP_QSTR_GP30), MP_ROM_PTR(&pin_GPIO30) },
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{ MP_ROM_QSTR(MP_QSTR_LCD_DB2), MP_ROM_PTR(&pin_GPIO31) },
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{ MP_ROM_QSTR(MP_QSTR_GP31), MP_ROM_PTR(&pin_GPIO31) },
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{ MP_ROM_QSTR(MP_QSTR_LCD_DB3), MP_ROM_PTR(&pin_GPIO32) },
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{ MP_ROM_QSTR(MP_QSTR_GP32), MP_ROM_PTR(&pin_GPIO32) },
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{ MP_ROM_QSTR(MP_QSTR_LCD_DB4), MP_ROM_PTR(&pin_GPIO33) },
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{ MP_ROM_QSTR(MP_QSTR_GP33), MP_ROM_PTR(&pin_GPIO33) },
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{ MP_ROM_QSTR(MP_QSTR_LCD_DB5), MP_ROM_PTR(&pin_GPIO34) },
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{ MP_ROM_QSTR(MP_QSTR_GP34), MP_ROM_PTR(&pin_GPIO34) },
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{ MP_ROM_QSTR(MP_QSTR_LCD_DB6), MP_ROM_PTR(&pin_GPIO35) },
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{ MP_ROM_QSTR(MP_QSTR_GP35), MP_ROM_PTR(&pin_GPIO35) },
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{ MP_ROM_QSTR(MP_QSTR_LCD_DB7), MP_ROM_PTR(&pin_GPIO36) },
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{ MP_ROM_QSTR(MP_QSTR_GP36), MP_ROM_PTR(&pin_GPIO36) },
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// ADC pins (RP2350B extended GPIOs)
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{ MP_ROM_QSTR(MP_QSTR_GP40), MP_ROM_PTR(&pin_GPIO40) },
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{ MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_GPIO40) },
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{ MP_ROM_QSTR(MP_QSTR_ADC0), MP_ROM_PTR(&pin_GPIO40) },
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{ MP_ROM_QSTR(MP_QSTR_GP41), MP_ROM_PTR(&pin_GPIO41) },
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{ MP_ROM_QSTR(MP_QSTR_A1), MP_ROM_PTR(&pin_GPIO41) },
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{ MP_ROM_QSTR(MP_QSTR_ADC1), MP_ROM_PTR(&pin_GPIO41) },
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{ MP_ROM_QSTR(MP_QSTR_GP42), MP_ROM_PTR(&pin_GPIO42) },
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{ MP_ROM_QSTR(MP_QSTR_A2), MP_ROM_PTR(&pin_GPIO42) },
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{ MP_ROM_QSTR(MP_QSTR_ADC2), MP_ROM_PTR(&pin_GPIO42) },
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{ MP_ROM_QSTR(MP_QSTR_GP43), MP_ROM_PTR(&pin_GPIO43) },
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{ MP_ROM_QSTR(MP_QSTR_A3), MP_ROM_PTR(&pin_GPIO43) },
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{ MP_ROM_QSTR(MP_QSTR_ADC3), MP_ROM_PTR(&pin_GPIO43) },
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{ MP_ROM_QSTR(MP_QSTR_GP44), MP_ROM_PTR(&pin_GPIO44) },
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{ MP_ROM_QSTR(MP_QSTR_A4), MP_ROM_PTR(&pin_GPIO44) },
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{ MP_ROM_QSTR(MP_QSTR_ADC4), MP_ROM_PTR(&pin_GPIO44) },
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{ MP_ROM_QSTR(MP_QSTR_GP45), MP_ROM_PTR(&pin_GPIO45) },
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{ MP_ROM_QSTR(MP_QSTR_A5), MP_ROM_PTR(&pin_GPIO45) },
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{ MP_ROM_QSTR(MP_QSTR_ADC5), MP_ROM_PTR(&pin_GPIO45) },
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// I2C object
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{ MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
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{ MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
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// Display object
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{ MP_ROM_QSTR(MP_QSTR_DISPLAY), MP_ROM_PTR(&displays[0].display) },
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};
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MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);

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