circuitpython/ports/atmel-samd/boards/itsybitsy_m4_express/mpconfigboard.h

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#define MICROPY_HW_BOARD_NAME "ItsyBitsy M4 Express"
#define MICROPY_HW_MCU_NAME "samd51g19"
#define CIRCUITPY_MCU_FAMILY samd51
// This is for Rev B
#define MICROPY_HW_APA102_MOSI (&pin_PB03)
#define MICROPY_HW_APA102_SCK (&pin_PB02)
#define CIRCUITPY_BITBANG_APA102
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// These are pins not to reset.
// QSPI Data pins
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#define MICROPY_PORT_A (PORT_PA08 | PORT_PA09 | PORT_PA10 | PORT_PA11)
// DotStar pins, QSPI CS, and QSPI SCK
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#define MICROPY_PORT_B (PORT_PB02 | PORT_PB03 | PORT_PB10 | PORT_PB11)
#define MICROPY_PORT_C (0)
#define MICROPY_PORT_D (0)
#define AUTORESET_DELAY_MS 500
// If you change this, then make sure to update the linker scripts as well to
// make sure you don't overwrite code
#define CIRCUITPY_INTERNAL_NVM_SIZE 8192
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#define BOARD_FLASH_SIZE (FLASH_SIZE - 0x4000 - CIRCUITPY_INTERNAL_NVM_SIZE)
#include "external_flash/devices.h"
#define EXTERNAL_FLASH_DEVICE_COUNT 1
#define EXTERNAL_FLASH_DEVICES GD25Q16C
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#include "external_flash/external_flash.h"
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#define DEFAULT_I2C_BUS_SCL (&pin_PA13)
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#define DEFAULT_I2C_BUS_SDA (&pin_PA12)
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#define DEFAULT_SPI_BUS_SCK (&pin_PA01)
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#define DEFAULT_SPI_BUS_MOSI (&pin_PA00)
#define DEFAULT_SPI_BUS_MISO (&pin_PB23)
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#define DEFAULT_UART_BUS_RX (&pin_PA16)
#define DEFAULT_UART_BUS_TX (&pin_PA17)