Hi
As you say, the SPD frame consist of two ascii strings and the last byte is source device information but reading the CEA-861 specification it says that unused characters should be NULL (i.e 0x00). And 0x00 is also a valid value for the source device information. So I assumed I could keep the default values of 0x00.
I have now tried with valid ascii characters in all fields but no difference. However I'm puzzled about the size.
The length should be 25 (8 + 16 + 1), however in the ADV7511 programming guide (rev G) table 112 it is given
with "packet byte 0" -> "packet byte 27", a total of 28.
Hmm, 25 + 3 = 28, maybe the header should be shifted in 3 bytes. But what should then be in the "header bytes" ?
Martin