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makris
Joined: 08 Jan 2013
Posts: 1
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| PIC16F877 / verification error and invalid target id warning |
 Posted: Wed Jan 09, 2013 5:34 am |
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Hi, I am a university student and I am trying to go over some tutorials that were given to me by my supervisor and I am encountering some strange errors. It should be noted that this is my first time I am attempting PIC programming so all I know for sure is that I am following the tutorial step by step so it is pretty clear to me that something is happening that was not suppose to happen.
I am using MPLAB IDE v.7.4 and MPLAB ICD2 as the controller. My PIC16F877 is connected onto a PIC board which has a 20MHZ crystal a MAX232 and is connected onto the controller using an RJ11 connector. The PIC is powered by an external adapter of 5V/1A and there are also 8 LEDs onto all B pins.
The code I am using is a basic LED counting test:
| Code: |
//LED counting test.c
#include<16F877.H>
#pragma fuses HS,NOWDT,NOPROTECT,NOLVP
#pragma use delay(clock=20000000)
void main()
{
int value;
set_tris_b(0x00);
for(value=0; value<=60; value++)
{
OUTPUT_B(value);
delay_ms(1000000);
}
}
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MPLAB gives me a warning and an error
Warning:
ICDWarn0020: Invalid target device id (expected=0x4D, read=0x1FF) Error:
ICD0161: Verify failed (MemType = Program, Address = 0x0, Expected Val = 0x3000, Val Read = 0x3FFF)
I’ve been looking around through the internet for similar topics but I can’t seem to figure out what’s wrong. What got me really confused is the fact that I bought a new PIC just to try and see if it got fried, and the first time I tried to program it, it worked. But the weird thing is after being programmed once it started the same problems as the previous PIC.
I also tried to set the memory locations as manual like some forums suggested but nothing changed.
The Self test numbers are:
Target Vdd: 5.04
Target Vpp:12.46
MPLAB ICD 2 Vpp:12.54
And additional info:
Oscillator HS
Watchdog timer OFF
Power Up timer OFF
Brown Out detect ON
Low Voltage Program DISABLED
Flash Program write ENABLED
Data EE read protect OFF
Code Protect OFF
Thanking you in advance,
Kyriacos Makris |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19518
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| Posted: Wed Jan 09, 2013 7:21 am |
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0x1FF, is normally that there is something wrong with the connections.
Triple check that the programming connector does match the recommended wiring pattern, especially ground connections etc.. Are you sure that the 5v/1A adapter is not going overvoltage when the you switch off, or starting overvoltage with no load, and then spiking the chip when you connect it.
Best Wishes |
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