82066163-7050-ab49-b8cc-b3855e8d2252

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This Extension Unit used for Logitech RightLight Technology.

 * Most Logitech Cams support so called "RightLight Technology"
 * It is software based multi field mesuring and adopted exposure
 * settings.
 * The thecnology works as fallow:
 * the image on the cam will splitted to 8 fields, each field has two parts.
 *  -----------------  To get the light intensity of one field,
 *  |   |   |   |   |  host should SET the adress of field and then 
 *  |  c4   |  c5   |  GET the result. The result has two bytes,
 *  -----------------  first byte is the left part of the field,
 *  |   |   |   |   |  sesond byte is the right part of the field.
 *  |  c6   |  c7   |  
 *  -----------------
 *  |   |   |   |   |
 *  |  c8   |  c9   |
 *  -----------------
 *  |   |   |   |   |
 *  |  ca   |  cb   |
 *  -----------------
 *

....

/* With CS 5 we set the adress of field
 * On CS 6 we get results.
 */
#define XU_CS_MESURE_FIELD 5
#define XU_CS_MESURE_FIELD_RET 6

....