platform-teensy-gcc10/boards/teensy31.json

{
  "build": {
    "arduino": {
      "ldscript": "mk20dx256.ld"
    },
    "core": "teensy3",
    "cpu": "cortex-m4",
    "extra_flags": "-D__MK20DX256__ -DARDUINO_TEENSY31",
    "f_cpu": "72000000L",
    "mcu": "mk20dx256"
  },
  "debug": {
    "jlink_device": "MK20DX256xxx10",
    "svd_path": "MK20D5.svd"
  },
  "frameworks": [
    "arduino",
    "mbed"
  ],
  "name": "Teensy 3.1 / 3.2",
  "upload": {
    "maximum_ram_size": 65536,
    "maximum_size": 262144,
    "protocol": "teensy-gui",
    "protocols": [
      "teensy-cli",
      "teensy-gui",
      "jlink"
    ]
  },
  "url": "https://www.pjrc.com/store/teensy31.html",
  "vendor": "Teensy"
}