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Changes to mpconfigboard.h and pins.c
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mpconfigboard.h

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#pragma once
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#define MICROPY_HW_BOARD_NAME "Microchip Curiosity CircuitPython Nano"
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#define MICROPY_HW_MCU_NAME "same51j20"
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#define CIRCUITPY_MCU_FAMILY samd51
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#define MICROPY_HW_LED_STATUS (&pin_PB23)
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#define MICROPY_HW_NEOPIXEL (&pin_PB22)
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#define EXTERNAL_FLASH_QSPI_DUAL
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#define BOARD_HAS_CRYSTAL 1
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// USB is always used internally so skip the pin objects for it.
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#define IGNORE_PIN_PA24 1
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#define IGNORE_PIN_PA25 1
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#define DEFAULT_I2C_BUS_SCL (&pin_PB31)
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#define DEFAULT_I2C_BUS_SDA (&pin_PB30)
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#define LCD_SPI_BUS_SCK (&pin_PA05)
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#define LCD_SPI_BUS_MOSI (&pin_PA04)
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#define LCD_SPI_BUS_CS (&pin_PA07)
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#define LCD_BACKLIGHT (&pin_PA06)
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#define SDCARD_SPI_BUS_SCK (&pin_PA17)
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#define SDCARD_SPI_BUS_MOSI (&pin_PA16)
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#define SDCARD_SPI_BUS_MISO (&pin_PA18)
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#define SDCARD_SPI_BUS_CS (&pin_PA19)
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#define DEFAULT_CAN_BUS_TX (&pin_PB12)
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#define DEFAULT_CAN_BUS_RX (&pin_PB13)
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#define DEFAULT_CAN_BUS_STDBY (&pin_PB17)
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#define DEFAULT_UART_BUS_RX (&pin_PA23)
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#define DEFAULT_UART_BUS_TX (&pin_PA22)

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) 2017 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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static const mp_rom_map_elem_t board_module_globals_table[] = {
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CIRCUITPYTHON_BOARD_DICT_STANDARD_ITEMS
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{ MP_ROM_QSTR(MP_QSTR_D0), MP_ROM_PTR(&pin_PA15) },
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{ MP_ROM_QSTR(MP_QSTR_D1), MP_ROM_PTR(&pin_PA20) },
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{ MP_ROM_QSTR(MP_QSTR_D2), MP_ROM_PTR(&pin_PA21) },
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{ MP_ROM_QSTR(MP_QSTR_D3), MP_ROM_PTR(&pin_PA27) },
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{ MP_ROM_QSTR(MP_QSTR_D4), MP_ROM_PTR(&pin_PB14) },
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{ MP_ROM_QSTR(MP_QSTR_D5), MP_ROM_PTR(&pin_PB15) },
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{ MP_ROM_QSTR(MP_QSTR_D6), MP_ROM_PTR(&pin_PB16) },
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{ MP_ROM_QSTR(MP_QSTR_D7), MP_ROM_PTR(&pin_PB17) },
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{ MP_ROM_QSTR(MP_QSTR_D8), MP_ROM_PTR(&pin_PB22) },
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{ MP_ROM_QSTR(MP_QSTR_D13), MP_ROM_PTR(&pin_PB23) },
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{ MP_ROM_QSTR(MP_QSTR_LED), MP_ROM_PTR(&pin_PB23) },
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{ MP_ROM_QSTR(MP_QSTR_NEOPIX), MP_ROM_PTR(&pin_PB22) },
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{ MP_ROM_QSTR(MP_QSTR_VREF), MP_ROM_PTR(&pin_PA03) },
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{ MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PB04) },
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{ MP_ROM_QSTR(MP_QSTR_A1), MP_ROM_PTR(&pin_PB05) },
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{ MP_ROM_QSTR(MP_QSTR_A2), MP_ROM_PTR(&pin_PB06) },
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{ MP_ROM_QSTR(MP_QSTR_A3), MP_ROM_PTR(&pin_PB07) },
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{ MP_ROM_QSTR(MP_QSTR_A4), MP_ROM_PTR(&pin_PB08) },
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{ MP_ROM_QSTR(MP_QSTR_A5), MP_ROM_PTR(&pin_PB09) },
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{ MP_ROM_QSTR(MP_QSTR_DAC), MP_ROM_PTR(&pin_PA02) },
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{ MP_ROM_QSTR(MP_QSTR_CAP1), MP_ROM_PTR(&pin_PB09) },
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{ MP_ROM_QSTR(MP_QSTR_LCD_CS), MP_ROM_PTR(&pin_PA07) },
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{ MP_ROM_QSTR(MP_QSTR_LCD_MOSI), MP_ROM_PTR(&pin_PA04) },
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{ MP_ROM_QSTR(MP_QSTR_LCD_SCK), MP_ROM_PTR(&pin_PA05) },
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{ MP_ROM_QSTR(MP_QSTR_SDA), MP_ROM_PTR(&pin_PB30) },
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{ MP_ROM_QSTR(MP_QSTR_SCL), MP_ROM_PTR(&pin_PB31) },
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{ MP_ROM_QSTR(MP_QSTR_BLE_TX), MP_ROM_PTR(&pin_PA12) },
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{ MP_ROM_QSTR(MP_QSTR_BLE_RX), MP_ROM_PTR(&pin_PA13) },
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{ MP_ROM_QSTR(MP_QSTR_BLE_CLR), MP_ROM_PTR(&pin_PA14) },
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{ MP_ROM_QSTR(MP_QSTR_SD_MOSI), MP_ROM_PTR(&pin_PA16) },
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{ MP_ROM_QSTR(MP_QSTR_SD_MISO), MP_ROM_PTR(&pin_PA18) },
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{ MP_ROM_QSTR(MP_QSTR_SD_SCK), MP_ROM_PTR(&pin_PA17) },
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{ MP_ROM_QSTR(MP_QSTR_SPARE_0), MP_ROM_PTR(&pin_PB00) },
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{ MP_ROM_QSTR(MP_QSTR_SPARE_1), MP_ROM_PTR(&pin_PB01) },
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{ MP_ROM_QSTR(MP_QSTR_SPARE_2), MP_ROM_PTR(&pin_PB02) },
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{ MP_ROM_QSTR(MP_QSTR_SPARE_3), MP_ROM_PTR(&pin_PB03) },
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{ MP_ROM_QSTR(MP_QSTR_DEBUG_TX), MP_ROM_PTR(&pin_PA22) },
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{ MP_ROM_QSTR(MP_QSTR_DEBUG_RX), MP_ROM_PTR(&pin_PA23) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_CAN_RX), MP_ROM_PTR(&pin_PB13) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_CAN_TX), MP_ROM_PTR(&pin_PB12) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_CAN_STANDBY), MP_ROM_PTR(&pin_PB17) },
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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_SPI), MP_ROM_PTR(&board_spi_obj) },
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{ MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
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};
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MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);

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