Packet format

[IanB]

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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[CF Mark]

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]

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