ICDWarn0020: Invalid target device id (expected=0x4F, read=0x0)

[kutsi]

Hi all,

I'm trying to program 18f4550, using MPLAB ICD2. I successfully compiled several timesat beforehand (with the same board design!!!).But this time something strange happened. This is really killing me, because I tried to solve the problem for last 4 hours and nothing changed. An error message keeps appearing when I try to compile with ICD2.
ICDWarn0020: Invalid target device id (expected=0x4F, read=0x0)
Does it mean my PIC is dead?
I'm using same devices, same board design.
Power is supplied to the board. Therefore I assume there is no failure in the connection.

Does this message appear when there is only hardware failures?

Best Regards

[mister_e]

I can't told you, mine have been used 4-5 times and worked... so it's still like a brand new one... but with few years of dust gathering...

i would guess of a bad cable, or poor MCLR voltage while programming. Should be 'round 13 volts.

EDIT: make sure you don't load PGD,PGC pins too much.

[kutsi]

I'm really tired right now. It still does not work... I will continue with it tomorrow. Just bored right know.
And also for the interested ones, I'm trying to write my second picbasic code. I thought it would be easy. It is not. I'm mixed up. I will post the code here, and actually it is nothing. I would really appreciate any help.

I was using this code in C, where I had an ADC header file. Now I 'm surt of trying to convert it to Picbasic.

'Aim: to use adc bits as inputs, apply sinusoidal input and
'upgrade the blink project a little further. The next step is going to
'be using interrupt.

DEFINE LOADER_USED 1
DEFINE RESET_ORG 800H

OpenADC(ADC_FOSC_32&ADC_RRIGHT_JUST&ADC_12_TAD,ADC _CH0&ADC_INT_OFF,0)
' I do not really know how to activate ADC, and use it. The above one
'is actually a c code.

Outvalue var PORTD.0

Outvalue= %0 'Set PORTD.0 output
TRISA = %11111111 ' Set PORTA to all input, so I can use ADC
' bits as input
ADCON1 = %10000010' Set PORTA analog and right justify result


SetChanneltoADC(ADC_CHO) ' Want to set channel 0

ConvertADC() 'Convert the ADC value


while (Busy adc()) ' while it is busy keep it in a loop



' adc_'result=Read ADC() 'I used ADCIN 0, adcresult

adc_result var word ' Create adc_'result to store result

Pause 500 ' Wait .5 second

ADCIN 0, adcresult ' Read channel 0 to adcresult

loop:if adcresult> 125 ' I thought if it is 8 bits
'2^8=256
Outvalue =! Outvalue

Pause 100 ' Wait .1 second
Goto loop ' Do it forever
End

[skimask]

OpenADC(ADC_FOSC_32&ADC_RRIGHT_JUST&ADC_12_TAD,ADC _CH0&ADC_INT_OFF,0)

Yes, that is C, but if you inspect the A/D converter section of whatever PIC you are planning to use, you'll recognize most of those bits and pieces of the C code, therefore, you'll be able to convert your program from C to PBP...

For instance...
ADC_FOsc32 - base ADC timing on FOSC/32
ADC_Right_Just - right justify the result...and so on and so on...

SetChanneltoADC(ADC_CHO) ' Want to set channel 0
ConvertADC() 'Convert the ADC value
while (Busy adc()) ' while it is busy keep it in a loop
' adc_'result=Read ADC() 'I used ADCIN 0, adcresult

Same thing here. You're on the right track, just gotta look a bit harder at the datasheets, PBP manual, etc.

Converting C to PBP isn't all that hard. You just have to know what (or which PIC) you're dealing with fairly well.
Once you've learned one PIC, you've practically learned them all...

[kutsi]

'Aim: to use adc bits as inputs, apply sinusoidal input and
'upgrade the blink project a little further. The next step is going to
'be using interrupt.


'OpenADC(ADC_FOSC_32&ADC_RRIGHT_JUST&ADC_12_TAD,AD C_CH0&ADC_INT_OFF,0)
' I do not really know how to activate ADC, and use it. The above one
'is actually a c code.


Define ADC_BITS 8 ' Set number of bits in result
Define ADC_CLOCK 3 ' Set clock source (3=rc)
Define ADC_SAMPLEUS 50 ' Set sampling time in uS

ADC_intstatus var PortB.0

On Interrupt Goto ADC_interrupt

INTCON=%10010000 ' Enable RBO interrupt

Outvalue var PORTD.0
adc_result var word ' Create adc_'result to store result

Outvalue= 0 'Set PORTD.0 output
TRISA = %11111111 'Set PORTA to all input, so I can use ADC
' bits as input
ADCON1 = %10000010' Set PORTA analog and right justify result

DISABLE
ADC_interrupt:

Pause 500 ' Wait .5 second while (Busy adc()) ' while it is busy keep it in a loop

ADCIN 0, adc_result ' Read channel 0 to adcresult

if adc_result> 125 then Outvalue =! Outvalue ' I thought if it is 8 bits, then 2^8=256


RESUME
ENABLE

End



Thanks for the comments, Skimask. I was busy studying as u suggested. It is the reason for the late reply. This is the new code, with 'interrupt' in it.

My pic is dead, I've ordered a new one. I cannot try it right now.

I'm working with PIC18F4550. Want to use A/D pins as inputs, and make PORTD.0 to blink led.

[kutsi]

actually I tried to debug it with the simulation.

CORE-E0002: Stack under flow error occurred from instruction at 0x0000c4

Can someone help me on the code?

[Nonsoezeoke]

Hello

was wondering if Kutsi's issue has been sorted or someone else has any idea on how to sort out the vexing ICDWarn0020: Invalid target device id (expected=0x21, read=0x3E)? Thats what i see on the PicDem4 Demo board. I'm trying to simulate a USART transfer but dont know what PIC18f variant came with the board. It says P18PDEM4_DEMO.

Been at this all day.

Any help please?