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Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
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Posts: 874
Hi all I'm trying to workout how to send commands to a display, the wire diagram list the parallel ports, but I'm abit lost on the other parts of the interface.I'm just trying to understand how it works, not so much spoon-feed code, a overview of the system would be helpful.
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
Thanks Wastrel , I normal skip over that picture, looking at 6.5.6 say I want to send 1 high bit on DB0 if I set RW high and RS and DB0 to high then lower then RS then set E high then DB0 high then invert all the pins? Or can RS and DB0 stay high throughout the thing?
Shrad I might for the TFT, but going to test the LCD and otherparts, and will do the TFT display last in the project.
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
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Posts: 874
The examples that I've seen do not explain how to select the pins for the communication, using PMP libary. And would like to understand whats happen under the cover.
Assert chip select if needed, usually by sending it low. Set RS to whatever it needs to be, I don't know what it does offhand. Send RW (which is Read Not Write) Low. This is one operation so long as they are all on the same port, one access. Minimum wait. Send E high. Second operation. Minimum wait. Put your data on the D pins. Third operation. Minimum wait. Drop E. Last operation. And then minimum wait time before doing anything else. That will write a byte.
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Parallel communication with TFT or LCD display
