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Packet format

IanB

New member
I'm wondering about the packet communications between various CF modules. Do they all use the same type of packet communications?

On my 635 the top two bits of a packet are defined as follows:

00 - normal command from host to 635
01 - normal response from 635 to host
10 - normal report from 635 to host
11 - error response from 635 to host

Is this true for all CF display types?

Also edited after posting:

Is each packet defined the same on every module? Obviously not every display supports every feature, but does packet type 0x1F always mean "send data to LCD"?

Ian
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Last edited:

CF Mark

Administrator
They are not all the same.

Obviously the HD44780 modules user thier own parallel interface.

The 632/634 modules use almost identical commands.
The 631/633/635 modules use the same packet system but have slightly different command sets.

See the module datasheets for the full command set details.
 

IanB

New member
They are not all the same.

Obviously the HD44780 modules user thier own parallel interface.

The 632/634 modules use almost identical commands.
The 631/633/635 modules use the same packet system but have slightly different command sets.

See the module datasheets for the full command set details.
Thanks for the quick reply!

Ian
 
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