Configuring Defines For 8-bit LCD

[sayzer]

Come on lerameur,

"Dim data1 as word"

You are also not using PBP!


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[lerameur]

Like I said, I want to use this program but convert it into PBP
So from basic to PBP
I know that this is a pogram that compiles good with microbasic, but I want to use PBP.

K

[BigWumpus]

Ken,

you have written parts of this thread also to the PicList-mailinglist. Just try to understand the answers there !

I think you have 2 problems in 1 thread:

1. talking to a LCD by 8 data-lines

2. Using the AD-modul of a 16F876A


1.:
You have to wire PortB.0 until PortB.7 to the signals DB0 to DB7 of the LCD. The E-, RS- and RW-signal can be set to any free digital portpin !

2.:
my writing from the PicList:
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Ken,
you have to make clear, what ports you are using. This is important !
First you tried PortC.0 as AN4 - wrong,
then you changed it to PortA ? What pin ?
Now you use an unknwon language and refers to channel 3.

So,
make it easy for us to write your program.

What Port-Pin is connected to the analog input ?
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[lerameur]

well I do not want to start a new thread.
Mainly,I thought that I needed 8 bit to LCD since I wanted 8 bit analog input, but that is not the case, SO I will stay at 4 bit to LCD. which works fine.
Just my A/D conversion is not working. I have een playing around with ADCON0 AND ADCON1. I looked into PBP manual but no reference of ADCON0, AND THERE IS LITTLE on the spec sheet.

DEFINE LCD_DREG PORTB ' Set LCD Data port
DEFINE LCD_DBIT 4 ' Set starting Data bit (0 or 4) if 4-bit bus
DEFINE LCD_RSREG PORTB ' Set LCD Register Select port
DEFINE LCD_RSBIT 1 ' Set LCD Register Select bit
DEFINE LCD_EREG PORTB ' Set LCD Enable port
DEFINE LCD_EBIT 0 ' Set LCD Enable bit
DEFINE LCD_BITS 4 ' Set LCD bus size (4 or 8 bits)
DEFINE LCD_LINES 2 ' Set number of lines on LCD

' Define ADCIN parameters
Define ADC_BITS 10 ' Set number of bits in result
Define ADC_CLOCK 3 ' Set clock source (3=rc)
Define ADC_SAMPLEUS 50 ' Set sampling time in uS


adval var word
TRISA = %11111111 ' Set PORTA to all input
ADCON1 = %10000000
ADCON0 = %00000101
Low PORTB.2 ' LCD R/W line low (W)
Pause 500 ' Wait .5 second

loop: ADCIN 4, adval ' Read channel 4 to adval

Lcdout $fe, 1
Lcdout "Value: ", DEC adval
Pause 100
Goto loop
End

end

[lerameur]

as far as port I am using .
RB4 to RB7 out to LCD
RB0 RB1 as enable and register select bit

RA analog input

k

[BigWumpus]

Hi K,

You can forget to set Register ADCON0, because it is complete done by PBP.

The 16F876A has 5 analog inputs. If you want to use all of them, you should set the lower 4 bits of ADCON1 to "0000". Look at the datasheet !

You WROTE, you want to use 8 bit ad-input.
In your programm you USE 10-bit ad-input. Maybe you should define your parameters.
Using 10-bit ad you have to choose right-justified results, because pbp doesn't convert it. So put a "1" it the MSB of ADCON1!

[lerameur]

hi

I change these lines
TRISA = %11111111
ADCON1 = %10000010
ADCON0 = %11000001

and now it works, but it the output decimal value is never higher then 807, anyone know why

k