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Guacamoleroger

PmodCLS with 20x4 LCD

Question

Hy, guys,

I am using the PmodCLS, and although it is retired now (October 2018), my project is ongoing with 4 of them, using an adapted VHDL demo code from resource center.

I am in need of using one 20x4 LCD module instead of the 16x2 I have there. 

As a first innocent try, I just connected in parallel the 20x4 pins with the 16x2 pins. The 16x2 continue to work, but the 20x4 shows only squares...(contrast and backlight connections are ok).

In the demo lookup file it does not seems to have a configuration command for the LCD. Is PmodCLS automatically configured for 16x2?

How could I use a 20x4 LCD on PmodCLS?

Does anyone have the information about the instructions set of PmodCLS that could be used on a 20x4 LCD?

Thanks for your help,

Guacamoleroger

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Hi @Guacamoleroger,

When you say a "20x4" do you mean displaying 20 characters horizontally and 4 characters vertically? I took a look at the datasheet for the LCD screen (available here) and the only options for the display is using a single line of 5x8 dot patterns, a single line of a 5x10 dot patterns, and two lines of 5x8 dot patterns, so my understanding is that the LCD screen simply does not support the 20x4 variant that you are hoping to use. Instead, the most you get is 16 characters in total, 8 for both lines.

Thanks,
JColvin

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