Nokia COLOR LCD PicBasicPro 2.50a example code

[srspinho]

Hi Skimask,

I just received my Color LCD and the breadboard from SparkFun.

I´m trying to convert your source code to run on a 16F877 (8 Kb, 368 byts of RAM, 256 bytes of EEPROM)
I´m doing that just because I can not find the 18F4620 here in Brazil.

So, I did some modifications as you suggested :

1) Changed de OSC to 10 (Mhz)

2) The line :
clcdENDFLASH con $FFFF 'IMPORTANT - change this value to the size of the PICs program space - 1
was changed to :
clcdENDFLASH con $1FFF 'IMPORTANT - change this value to the size of the PICs program space - 1

3) At the end of the code, the Org value was changed to org 0x1F60

4) Removed the 13 last lines used for the modified ASCII characters

But, when I try to compile, the PBP returns some strange error messages :

Warning[207] d:\teste_~1\nokia~2.asm 188 : Found Label after column 1. (bra)
Error[122] d:\teste_~1\nokia~2.asm 188 : Illegal opcode (clcdoverstr)
Message[303] d:\teste_~1\nokia~2.asm 190 : Program word too large. Truncated to core size (5465)
Message[303] d:\teste_~1\nokia~2.asm 190 : Program word too large. Truncated to core size (7374)
Message[303] d:\teste_~1\nokia~2.asm 190 : Program word too large. Truncated to core size (7472)
Message[303] d:\teste_~1\nokia~2.asm 190 : Program word too large. Truncated to core size (696E)
Message[303] d:\teste_~1\nokia~2.asm 190 : Program word too large. Truncated to core size (6723)

I don´t understand why the code doesn´t fit in my 877, since the same source compiled for the 18F4620 takes less than 3 Kb...

Do you have any idea or any tip to fit it on a 877 ?

Thank you !

[skimask]

I´m doing that just because I can not find the 18F4620 here in Brazil.

They're available practically everywhere else in the world... You've obviously got internet access...Get one...

Warning[207] d:\teste_~1\nokia~2.asm 188 : Found Label after column 1. (bra)
Error[122] d:\teste_~1\nokia~2.asm 188 : Illegal opcode (clcdoverstr)

Because there isn't a 'bra' opcode in the 16F877. The 2nd error is probably a result of the first.
Change the bra to goto in the macro and see what happens...

Message[303] d:\teste_~1\nokia~2.asm 190 : Program word too large. Truncated to core size (5465)

I don´t understand why the code doesn´t fit in my 877, since the same source compiled for the 18F4620 takes less than 3 Kb...

There's a number of different reasons. 18F registers don't multiple bank bit setting instructions every time you want to access a variable, 16F's do. Every time you want to access a register in an 18F, you just access it, period. With the 16F, you have to set either 1,2, or 3 bank bits first, then you can access it. So, for every variable access with an 18F, one word, for every variable access with a 16F, could be up to 3 instructions just to get to it. (see section 2.4 of the 16F877A datasheet and/or section 5 of the 18F4620 datasheet)

16F877 or 16F877A?

[mister_e]

CHK?RP do it for you

16F compile results is in WORDS while 18F is in BYTES

[srspinho]

Thank you guys !

well, I´m trying to buy the 4620 from the Brazilian Microchip official vendor. They say that the 4620 is not an usual item (?) and they have to import it and it will take a long time.

So, I decided to move my project to a 4550. I think this model will do the job.

Thank you again !

Regards

Sérgio

[DaveC3]

srspinho

Here is some code for the same display. I used some of Skimask's code for text manipulation. I am also sending pictures via USB from the PC. You will also see an encoder input to adjust the contrast of the display. Hope it helps.

Dave

[srspinho]

Thank you Dave !

sure it will help !

Just a doubt : What PIC have you used with this code ?

Finally, today I will receive my first 18F´s (one 18F4550 (really expensive) and 2 18F2520).

Thank you again !

[DaveC3]

srspinho

I use 18F4550 with USB boot-loader (slightly modified). I also made a VB6 program to send color pictures to the display via USB. If you are interested I can send you all the source codes.

Dave