Interfacing with LCD to debug

[keen101]

Where do I wire up the TX and RX lines of the TTL port to the LCD?

[ay2b]

Originally Posted by keen101

Where do I wire up the TX and RX lines of the TTL port to the LCD?

Based on the diagram, that LCD is not compatible with the TTL port. The diagram shows it wired to a "printer port", which is a parallel interface. The TTL port is a serial port. (It may be possible that the LCD also has a serial interface, not shown in this diagram.)

A byte consists of 8 bits. A parallel interface uses 8 pins and sends all bits at the same time (plus some control pins). A serial interface uses 1 pin and sends each bit in sequence.

You could still use the RC to control this LCD, but you would have to use the digital I/O pins, not the TTL port.

[keen101]

I'm pretty sure it has serial capabilities too. I will try and find the serial diagram when I can. But, I would like to know how to use the digital I/O pins too. how would i wire that up?

[jtdowney]

Precision Guessworks (1646) has a touchscreen LCD on the way along with our co-processor. The goal is to use it for diagnostics and debugging. We went with a Gumstix (LCD, interface, and co-processor) solution similar to what AdamBots (245) did in 2007.