text: #ifndef BOARD_CONFIG_H
  #define BOARD_CONFIG_H
  
  #define VENDOR_NAME "Adafruit Industries"
  #define PRODUCT_NAME "Metro M4 Express"
  #define VOLUME_LABEL "METROM4BOOT"
  #define INDEX_URL "http://adafru.it/3382"
  #define BOARD_ID "SAMD51J19A-Metro-v0"
  
  #define USB_VID 0x239A
  #define USB_PID 0x0021
  
  #define LED_PIN PIN_PA16
  #define LED_TX_PIN PIN_PA27
  #define LED_RX_PIN PIN_PB06
  
  #define BOARD_NEOPIXEL_PIN PIN_PB22
  #define BOARD_NEOPIXEL_COUNT 1
  
  #define BOOT_USART_MODULE                 SERCOM3
  #define BOOT_USART_MASK                   APBAMASK
  #define BOOT_USART_BUS_CLOCK_INDEX        MCLK_APBBMASK_SERCOM3
  #define BOOT_USART_PAD_SETTINGS           UART_RX_PAD1_TX_PAD0
  #define BOOT_USART_PAD3                   PINMUX_UNUSED
  #define BOOT_USART_PAD2                   PINMUX_UNUSED
  #define BOOT_USART_PAD1                   PINMUX_PA22C_SERCOM3_PAD0
  #define BOOT_USART_PAD0                   PINMUX_PA23C_SERCOM3_PAD1
  #define BOOT_GCLK_ID_CORE                 SERCOM3_GCLK_ID_CORE
  #define BOOT_GCLK_ID_SLOW                 SERCOM3_GCLK_ID_SLOW
  
  #endif
  