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Hello, I'll put it short:
-PIC 16F628A
-Vdd is 5.04 Volts
-Quarz is available
-PORTB can give a high level.
Problem:
-RA3 doesn't get a high level.
Done so far:
-Ideas ?Code:-
Start:
CMCON.0 = 1
CMCON.1 = 1
CMCON.2 = 1
Pause 5000
- Trisa.3 = 0
High Porta.3
Pause 5000
Low Porta.3
GOTO Start
All fine here... Depending your osc and config fuses setting it may work or not.
Make sure you're using a 20Mhz Crystal (and a PIC16F628-20), MCLR pin set to Vdd, and try that one and post your results
Code:@ __CONFIG _HS_OSC & _MCLRE_ON & _LVP_OFF & _WDT_OFF & _PWRTE_ON & _BODEN_ON
DEFINE OSC 20
PORTA=0
TRISA=0
CMCON=7
Start: TOGGLE PORTA.3
PAUSE 500
GOTO START
Config fuse setting
http://www.picbasic.co.uk/forum/showthread.php?t=543
In MPLAB having @ __CONFIG _HS_OSC & _MCLRE_ON & _LVP_OFF & _WDT_OFF & _PWRTE_ON & _BODEN_ON included.
Having it removed, it compiles. I changed the conf.bits via menu according to your idea.Code:Error[118] C:\PIC\XYZ.ASM 106 : Overwriting previous address contents (2007)
Error[118] C:\PIC\XYZ.ASM 106 : Overwriting previous address contents (2007)
Loaded C:\PIC\XYZ.COD.
BUILD SUCCEEDED: Mon Feb 05 21:24:52 2007
What happens(RA3):
Moment of Low: 0V
Moment of High: 0,71V
Other PINS
Moment of Low: 0V
Moment of High: 5V
Seems you didn't have a look to the thread i suggested, but anyways...
RA.3 is a full CMOS output type, so unless
- you have this pin shorted to gnd
- this i/o is blow
it have to work. Try with another PIC.
I used another one and the same result.
This pin is not connected yet so outer components don't interfere.
Here's the whole code. It is a POT command replacement that fits to my circuit (RC = 420 µs). Normally Wert is replaced by Wert2's contents.
If you are not german, you should understand it anyway(Wert means value, Zaehler = counter, Gelb = yellow and Gruen = green)...
Which thread are you referring to ?Code:Define OSC 8
Variablen:
PORTA=0
TRISA=0
CMCON=7
TRISB = 0
PORTA = 0
;VRCON = $20
Gruene_LED VAR PORTB.5
Gelbe_LED VAR PORTB.4
ADCWert VAR WORD
Erster_Wert VAR WORD
Zweiter_Wert VAR WORD
Zaehler VAR WORD
Zahl VAR BYTE
;Interrupts
INTCON = 0
Start:
Zahl = 0
FOR Zahl = 1 TO 4
High Gelbe_LED
Pause 167
Low Gelbe_LED
Pause 307
NEXT Zahl
GOSUB Wert
Erster_Wert = ADCWert
WRITE 0, Erster_Wert.BYTE0
WRITE 1, Erster_Wert.BYTE1
Pause 2931
Zahl = 0
FOR Zahl = 1 TO 4
High Gruene_LED
Pause 167
Low Gruene_LED
Pause 307
NEXT Zahl
GOSUB Wert
Zweiter_Wert = ADCWert
WRITE 2, Zweiter_Wert.BYTE0
WRITE 3, Zweiter_Wert.BYTE1
Pause 2791
IF Erster_Wert = Zweiter_Wert THEN
High Gelbe_LED
Pause 3140
Low Gelbe_LED
Pause 2010
ENDIF
IF Erster_Wert <> Zweiter_Wert THEN
High Gruene_LED
Pause 3140
Low Gruene_LED
Pause 2010
ENDIF
GOTO Start
Wert:
HIGH PORTA.3
PAUSE 5000
LOW PORTA.3
RETURN
Wert2:
ADCWert = 0
Trisa.3 = 0
High Porta.3
Pause 243
Trisa.3 = 1 ;Vertrauscht
WHILE Porta.3 = 1
ADCWert = ADCWert + 1
WEND
Zaehler = 600 - ( (600 / 1200) * ADCWert)
Pauseus Zaehler
RETURN
END
i didn't check the whole thing but i confirm that it blink PORTB.5 led, then turn on the LED on PORTA.3, then turn it off.
Your PIC i/o is dead OR there's a bad contact.
And i posted a link before in post #2 about the config fuses.
Good ideas.
How can I support you in doing so ?Quote:
i didn't check the whole thing
Having replaced the PIC I don't think so. I usually press it gently but firmly in the socket. Sometimes I even press when running.Quote:
Your PIC i/o is dead OR there's a bad contact.
Having read it fully, I will comment that. After my first impression it is just a summary of what fuses are possible. I think I am limited to the ones MPLAB offers ?! Additionally most settings are set to work in most cases so do you suggest focusing on something special for this issue ?Quote:
And i posted a link before in post #2 about the config fuses.
Yes, you're limited to what's in the .INC file of your PIC.Quote:
I think I am limited to the ones MPLAB offers ?
Well if the simple TOGGLE PORTA.3 loop don't work, you have to fix it first. Trust me it's working here.Quote:
How can I support you in doing so ?
Well depending what you call most case.. but me, i use around 50 different PIC model and i have thousands PBP code examples, templates, projects and includes store in my computer. So... how on hearth can i remind what i'd set in all of them and how the hardware is set-up on board... I can't even predict what i'll do next time. This is why i always comment the default config fuses and set ALL of them in my code. One day if i have to modify it, i have only one place to check.Quote:
Additionally most settings are set to work in most cases so do you suggest focusing on something special for this issue ?
Same rules apply to the other thousand code example on other microcontroller brands and other compiler i also use.
I fixed it, now it works. Let's see if the other code works aswell.Quote:
Well if the simple TOGGLE PORTA.3 loop don't work, you have to fix it first. Trust me it's working here.
Tell me something: How can I be sure that a problem can be found in the externals ? There are so many switches in the chip - the manufacturer calls them features, I name them obstacles.
The other code doesn't work, because the capacitor doesn't discharge.
I am using a WIMA MKS 4 0,01/250-N4 capacitor, I guess that means 10nF.
The resistor is 40K.
That should mean it takes 0,00004 seconds to charge and at a maximum the same to recharge due to - er - well-intended voltage levels.
Then I am recharging it, while counting, but it doesn't stop. When short circuiting the capacitor it works, so the code is OK.
Is this cap no 10nF - cap ?
Is there anything to be changed in the code ?
Quote:
ADCWert = 0
Trisa.3 = 0
High Porta.3
Pauseus 244
Trisa.3 = 1
High Gruene_LED
WHILE Porta.3 = 1
ADCWert = ADCWert + 1
WEND
Low Gruene_LED
Zaehler = 600 - ( (600 / 1200) * ADCWert) ;to keep time even
Pauseus Zaehler
RETURN
maybe because your Pauseus 244 is way too high? try to remove it.
This is right. It should be 40.
But.
I found out that the circuitry itself acts as a huge capacitor compared to this one.
I replaced it with 58 pF and threw away my calculations. Now it's time
to experiment....
I am using it ratiometrically but the same value doesn't seem to exist two times.
Somehow the capacitor has to have time to charge, having a too high value for Pauseus doesn't affect the measurement, it makes sure that the cap is surely charged. But here I cannot know when it's surely charged, but this must be more than zero.Code:Wert:
ADCWert = 0
Trisa.3 = 0
High Porta.3
;Pauseus 800
Trisa.3 = 1
WHILE Porta.3 = 1
ADCWert = ADCWert + 1
WEND
Trisa.3 = 0
Low Porta.3 ;To make UC = Vss
Pauseus 100 ;To make UC = Vss
RETURN
I did some testing. This is the result: Max = maximum value of the resistor, InB = In Between. Pause = Pause to load the cap.
It should be in the form of x² or -x². But both show strange behaviour.Code:Max InB Min Min InB Max
Pause 3 46336 54273 16388 8965 48132 30980
Pauseus 5 39433 54025 11274 64777 11529 27145
Do you have an idea ?
Quote:
Originally Posted by selbstdual
how did you fix it? do you still remember?
Hummmmm,Quote:
Originally Posted by sotoshie
how to tell it ???
6 years after his last post ...Quote:
Last Activity:- 8th May 2008 12:14.
( and moreover ... I thought he had been banned !!! )
Alain