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Hot!ICD3 & PIC32MX: barely able to read, unable to erase/write => SOLVED

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art tech
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2019/12/07 20:21:53 (permalink)
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ICD3 & PIC32MX: barely able to read, unable to erase/write => SOLVED

Working with ICD3 on a custom PIC32MX470F512L pcb.
PGC and PGD and Vpp and all GND & Vdd pins seem connected.
Vpp is connected to Vdd via 11k resistor. Vdd has plenty of current capability and reads 3.35V.
The CPU is recognized by the ICD3 no problem, but when I try reading it mostly throws up the error "Failed to read device".
When I say mostly, I mean the only time it reads the device okay is when I set it to only read the configuration word, and even that only reads okay about a third of the time or less.
I cannot erase or write to the decide at all.
 
Any suggestions about what I can test or try to get ICD3 to successfully read/erase/write the whole device (i.e. boot and program and ID memory included)?
******** SOLVED *******
Had forgotten to install VCAP, which once done, thankfully quickly solved this problem
post edited by art tech - 2019/12/07 20:52:54
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    NorthGuy
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    Re: ICD3 & PIC32MX: barely able to read, unable to erase/write 2019/12/07 20:35:17 (permalink)
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    Intermittent error like yours are usually caused by bad connection (poor contact, bad soldering etc.) or  lack of a capacitor on VCap.
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