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problem in setup pattern display LUT using i2c

Other Parts Discussed in Thread: DLPC350

Dear all,

 

I want to use i2c to control the lightcrafter4500.

I can write to change to mode (0x69), I can write to set LED current (0x4b).

But I CANNOT write to set the pattern display LUT.

I write order is as follow

0x77 0x01  //open mail box for image index

0x76 0x00 //set offset pointer

0x78 0x03 0x04 //

0x77 0x00 // close mail box

0x77 0x02  //open mail box for pattern definition

0x76 0x00 //set offset pointer

0x78 0x00 0x71 0x06 0x04 0x71 0x06 //

0x77 0x00 // close mail box

0x7d 0x00 //validate

when I read back from 0x7d, it always return 0x08

when I use GUI to read back the sequence, it seems the LUT have NOT be written.

 

Is there any special sequence or order to setup the  pattern display LUT?