Still no luck on a simple 16F88/ICD2 project - Electronic Circuits Projects Diagrams Free

mramos1 · 5th November 2006, 01:02 PM

This is sort of a repeat. I have a simple circuit (attached sorry such a poor drawing). I wanted to play with the ICD2, MPLABs, MikcroBASIC and the new to me 16F88. Last weekend was a waste. I had the ADC work fine. Now that stopped working. Any mikcrobasic folks on electro-tech?

If I can get a sample of the 16F88 ADC I will probably go assember. Mike K8LH

I think I am tring to many new things, but I would have to think the PIC is not configured right.

I import the raw .hex file and all works well. Just something is not configured correct I guess. Also, running 8Mhz now and on 3V (2 AA batteries)

Code:

program P16f88
'   8 Mhz internal OSC
    Symbol LED = 0
    Symbol POT = 0
    dim count as word
main:
 intcon=0         'interupt are disabled
 ansel=%00000001  'an0 port is analog mode others are in digital mode. page 113
 trisa=1          'port a0 is input others are output
 trisb=0          'all port b are output
 adcon0=%11000001       ' page 114
 adcon1=%10000000       ' page 115

    DO
    count=adc_read(POT)
    count=count
        ClearBit(PORTB,LED)
    VDelay_MS(count)
    count=adc_read(POT)
    count=count
        SETBIT(PORTB,LED)
    VDelay_MS(count)
  LOOP until 1 = 0
end.

Pommie · 5th November 2006, 02:00 PM

Are you aware that for the debugger to work if requires certain memory locations. In the case of the 88 they are 0x70, 0xF0, 0x170, 0x1F0, 0x1E7-0x1EF and program memory 0xF00-0xFFF. I don't know how you tell your compiler to reserve these but there must be a way. I also think you need a NOP at location zero but I can't find this in the help file at the moment.

HTH

Mike.

mramos1 · 5th November 2006, 02:19 PM

Hey Mike, I am back on this thing again.

The one variable I have is at 0x20/21, looks like they are using 0xA0 (I think it was).

But I even program and release from reset and it is a no go.. I figured the ad_registers are wrong, and I read over them a couple time. What is weird if I take one of them out the ADC works.

At this point just running it from the programmer not debugger would make me smile. I have wasted 2 hours this weekend on it and just do not see the problem.

Mike

Mike, K8LH · 5th November 2006, 02:28 PM

I only do Assembler and some C18 for 18F' devices. Sorry. But I'll look through my 16F88 code for examples for you.

Mike

Pommie · 6th November 2006, 12:51 AM

Hi Mike (Mramos - too many Mikes around here!)

When you said "I import the raw .hex file and all works well." I assumed you could get it working fine stand alone but not with the debugger.

Looking at your code, I am not sure what you are trying to do.

Are you trying to make an LED flash slow/fast dependent on the ADC input? If so, then your code should work.

Or, are you trying to make it come on above a certain value, if so, try

Code:

  DO
    count=adc_read(POT)
    if count > 512 then
        ClearBit(PORTB,LED)
    else
        SETBIT(PORTB,LED)
    end if
  LOOP until false

You also state that your using the 8MHz int osc but don't set OSCCON.
Try adding OSCCON = %01110000

Mike.

mramos1 · 6th November 2006, 10:45 AM

Pommie,

Yea, just tring to make the LED go faster and slower off the ADC.. It has been a pain. I have a lot of variable in there. I will try the OSCCON. I did not notice that in the ASM.

Also, everything works well but the actual program doing what it is supposed too.

mramos1 · 6th November 2006, 09:53 PM

Pommie.

That is it. Well two things. OSCCON was not set by the compiler, looked at disassembly.

I have done a 12F509 project and also a 16F683 and set OSC speed in the compiler and it worked. Other problem I think was a config, RB0 was set an CCP1 or something like that. I moved that to RB3. Bill told me last weekend use RB3 for LED PWM.. Had I done that I would have been closer.

It is running. New problem, if I release from reset it runs, and resets since I see the speed change. reset, new adc, etc. Maybe a decoupling cap. If it on a proto board, 8Mhz and ICD2 hook into it as well. Gonna look into that. I do not have MCLR pulled up. And I have the inchworm still in the circuit.

EDIT: New batteries, life is good. Now I need to add FET output to the LED. Then I will go to PCB and debug off that. And it will have a ICD connection and a jumpers to drop out VDD and MCLR too. Just in case.

But it is rock
solid now. MAN this was a lot of work for something simple. I saved sooo much time using BASIC, AGAIN!!!

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5th November 2006, 02:00 PM	(permalink)
Pommie	Are you aware that for the debugger to work if requires certain memory locations. In the case of the 88 they are 0x70, 0xF0, 0x170, 0x1F0, 0x1E7-0x1EF and program memory 0xF00-0xFFF. I don't know how you tell your compiler to reserve these but there must be a way. I also think you need a NOP at location zero but I can't find this in the help file at the moment. HTH Mike.

5th November 2006, 02:19 PM	(permalink)
mramos1	Hey Mike, I am back on this thing again. The one variable I have is at 0x20/21, looks like they are using 0xA0 (I think it was). But I even program and release from reset and it is a no go.. I figured the ad_registers are wrong, and I read over them a couple time. What is weird if I take one of them out the ADC works. At this point just running it from the programmer not debugger would make me smile. I have wasted 2 hours this weekend on it and just do not see the problem. Mike

5th November 2006, 02:28 PM	(permalink)
Mike, K8LH	I only do Assembler and some C18 for 18F' devices. Sorry. But I'll look through my 16F88 code for examples for you. Mike

6th November 2006, 12:51 AM	(permalink)
Pommie	Hi Mike (Mramos - too many Mikes around here!) When you said "I import the raw .hex file and all works well." I assumed you could get it working fine stand alone but not with the debugger. Looking at your code, I am not sure what you are trying to do. Are you trying to make an LED flash slow/fast dependent on the ADC input? If so, then your code should work. Or, are you trying to make it come on above a certain value, if so, try Code: DO count=adc_read(POT) if count > 512 then ClearBit(PORTB,LED) else SETBIT(PORTB,LED) end if LOOP until false You also state that your using the 8MHz int osc but don't set OSCCON. Try adding OSCCON = %01110000 Mike.

6th November 2006, 10:45 AM	(permalink)
mramos1	Pommie, Yea, just tring to make the LED go faster and slower off the ADC.. It has been a pain. I have a lot of variable in there. I will try the OSCCON. I did not notice that in the ASM. Also, everything works well but the actual program doing what it is supposed too.

6th November 2006, 09:53 PM	(permalink)
mramos1	Pommie. That is it. Well two things. OSCCON was not set by the compiler, looked at disassembly. I have done a 12F509 project and also a 16F683 and set OSC speed in the compiler and it worked. Other problem I think was a config, RB0 was set an CCP1 or something like that. I moved that to RB3. Bill told me last weekend use RB3 for LED PWM.. Had I done that I would have been closer. It is running. New problem, if I release from reset it runs, and resets since I see the speed change. reset, new adc, etc. Maybe a decoupling cap. If it on a proto board, 8Mhz and ICD2 hook into it as well. Gonna look into that. I do not have MCLR pulled up. And I have the inchworm still in the circuit. EDIT: New batteries, life is good. Now I need to add FET output to the LED. Then I will go to PCB and debug off that. And it will have a ICD connection and a jumpers to drop out VDD and MCLR too. Just in case. But it is rock solid now. MAN this was a lot of work for something simple. I saved sooo much time using BASIC, AGAIN!!! Last edited by mramos1; 6th November 2006 at 10:08 PM.