libtrellis/tests/testdata/test/testdev/tilegrid.json

{
  "TEST_R0C0:TESTTILE": {
    "cols": 20,
    "rows": 10,
    "sites": [

    ],
    "start_bit": 15,
    "start_frame": 10,
    "type": "TESTTILE"
  }
}