LCD BARgraphs

[Acetronics2]

The LED is on portb.2. Portb is set as all outputs except bit 1. See the trisb=1

So, where is the ... Tadaaa?? :-)

Ioannis

No tadaaaaaa ... just read a bit too quickly ( TRISx = %00000001 is so much easier to look at ...)

Strange ... i tried DT interrupts quite the same way ... no problems.

[Ioannis]

I think I am,

trisb=1 is equal to:

trisb=%00000001

Isn't this bit 0 of port b set as input?

Ioannis

[Acetronics2]

Hi,

Looks good ...

I tried THAT in MPSIM ... Works Great ...




INCLUDE "C:\PBP\MODEDEFS.BAS"
DEFINE OSC 4

INCLUDE "DT_INTS-14.bas" ; Base Interrupt System
INCLUDE "ReEnterPBP.bas" ; Include if using PBP interrupts

LED1 VAR PORTB.2

trisa=1:trisb=1:trisc=0:trisd=0:trise=0
PORTA=0:PORTB=0:PORTC=0:PORTD=0:PORTE=0

OPTION_REG = %00100001 ; Set TMR0 Prescaler to /2, RBPU on

adcon0=%10000000 'Fosc/32, ADC ON
adcon1=%10001110 'Right Justify, RA0 Analog, rest Digital I/O

ASM
INT_LIST macro ; IntSource, Label, Type, ResetFlag?
INT_Handler INT_INT, _ToggleLED1, PBP, yes
endm
INT_CREATE ; Creates the interrupt processor

INT_ENABLE INT_INT ; enable external (INT) interrupts
ENDASM

Main:
pause 1
GOTO Main

'---[INT - interrupt handler]--------------------------------------------------
ToggleLED1:
high LED1: pause 100:low led1
@ INT_RETURN


I just modified OPTION_REG value cause little things seemed strange to me ...

try it ... huuu ... is processor a 16F877 ????

Alain

[Ioannis]

Yes Alain, MCU is 16F877, but this is minor.

Do you mean that with OPTION_REG=$81 does not work also at your test?

I have not the board with me at work now. I will test it late today.

Ioannis

[Acetronics2]

I have an old 877 here...

I'll breaboard it ...

We'll see !!!

Alain

[Acetronics2]

Hi, Ioannis

YOUR code has passed the Breadboard test ...

Works as expected ... ( little flash when PORTB.0 tied to ground )

Alain

[Darrel Taylor]

Looking at the PICDEM2+ schematic some more, it seems that there might be a conflict with PORTB.0

<img src=http://www.picbasic.co.uk/forum/attachment.php?attachmentid=1794&stc=1&d=118289364 1>

With J6 installed (has to be for the LED on PORTB.2), the LED on PORTB.0 may not allow the voltage to rise far enough to register a HIGH level.
<br>

[Sean_Goddard]

I joined in this quite late, but on the original bargraph code posted by Darrel (and also the interrupt code posted elsewhere) I have one thing to say....WOW Darrel. GENIUS.. BOTH of these snippets have saved me hours of work on a project I'm working on.

I needed to poll an array of front panel switches every few milliseconds AND service a bargraph update AND change the frequency of a HPWM signal all at set times, I was in the process of writing an RTOS for the PIC to allow me to use queued commands executed on a priority/time basis, then these two pieces of code went live.

OK, you killed my six months of work on the RTOS, but I'm not complaining. Everytime I see a new posting by you I just KNOW it's gonna be soething that makes my life that little bit easier.

A huge thanks and keep up the excellent work.