man V4L2_TCH_FMT_DELTA_TD08(2)
8-bit signed Touch Delta
This format represents delta data from a touch controller.
Delta values may range from -128 to 127. Typically the values will vary through a small range depending on whether the sensor is touched or not. The full value may be seen if one of the touchscreen nodes has a fault or the line is not connected.
Byte Order. Each cell is one byte.
| start + 0: | D’00 | D’01 | D’02 | D’03 |
| start + 4: | D’10 | D’11 | D’12 | D’13 |
| start + 8: | D’20 | D’21 | D’22 | D’23 |
| start + 12: | D’30 | D’31 | D’32 | D’33 |