Hi Matt,

I am glad that you have resolved your issues, and indeed thanks to Parallax for their support.

Hi Red, Thank you for posting on the forum. When the units leave the factory, they are preloaded with the values for the following: bank 0 - contains the startup characters for MO logo bank 1 - contains that hoizontal bars bank 2 - contains the vertical bars bank 3 - contains the medium number chars...

Hi Danny,

I have replied to you via email.
Thank you.

Hi Danny,

Thank you for posting on the forum.

Can you please tell me where exactly you measure Vcc from? I have a feeling that somehow something is disconnected.

Hello Matt, Thank you for posting on the forum. Can you please tell me the PCB rev# and the firmware version of your LK204-25? The PCB# should be on the board, the firmware version can be queried by connecting the module via RS232 or TTL and sending the command 254 / 54. I am a little rusty on my ba...

Hi evan,

I am glad that I've been of help.
And btw, I am a gal!

Hi evan,

I hope that you caught the my last post. I think you posted at the same time. You probably get 0xFF because of wrong time of reading SSPBUF.

Hi evan, Please note that getKey() has SSPCON2bits.RCEN = 1 at the beginning of the function, this is not in the code that I suggested to try. For this loop: loop: kp = getKey(); if(kp == 0xff){ goto loop; } printChar(kp); goto loop; how about putting a check for 0x00, because this will be the value...

Hi evan, Can you tell me how far in the code you get? Do you still see blocks displayed on the module? Any of the keys you press get transmitted? If you can, please insert debug code to see which part of the code is actually reached and stepped through, and which is not reached. I'll try to find an ...

Hi ghost2501,

Which module do you have?

Hi evan, The poll keypad command is for RS232/TTL communication. This feature is offered to hosts that do not want the module to automatically send the keypresses. These hosts needs to send the Turn Auto Transmit off command. And for these hosts to retrieve the keypresses, they send the poll keypad ...

Hi evan, Put back the old: do { kp = getKey(); } while (!kp) printChar(kp); to get rid of the blocks, press keys and see if your receive them. Also note the following suggested changes: unsigned char getKey(void) { unsigned char keyPressed = 0x00; SSPCON2bits.SEN = 1; //send start bit while(!PIR1bit...

Hi evan,

I have a quick answer about the solid square (though I haven't looked at your code). A solid square very much likely means a 0x00. You are probably sending a printChar(0x00);

I'll look at the code now.

Hi evan, I notice that you have a cursor(0x98) command, I am not sure what that is for. Also just wondering about the extra while(1)'s in main, compiler must have warned you about that. The commands that you have within clrscrn() look good. How about adding a debug code right after clearing the scre...

Hi evan, I went back to the PIC data sheet and found that you have to configure the I2C port to receive data. You do this by setting SSPCON2<3>, please see waveform Fig. 15-22 on page 157 of the PIC18F452 data sheet. I see that in getKey(), you set SSPCON1.CKP, I am not sure why, but I believe that ...