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seen Aug 16 at 6:21

ERR


Jun
26
comment Is it true that a SD/MMC Card does wear levelling with its own controller?
@fredbasset Generally, if linux gets bad data, it has a fit. The company I work for has implemented a checksumming process directly on the block device that goes through a software layer. Data recovery and errors are now able to be reported to the kernel through that setup. Raw NAND is its own beast, but from what I've experienced it is more robust in terms of handling faults. Check out UBI and UBIFS, its basically JFFS3, really robust and offers some speedups.
Jun
13
comment Is it true that a SD/MMC Card does wear levelling with its own controller?
@fredbasset, way to zombie the thread ;) Its been a while since I did any SD card work. However, IIRC SD cards themselves will physically return whatever they feel like. Some of the newer ones combined with decent drivers may be able to detect an IO error. However may of the older SD cards will just return bad data that was stored in NAND and call it good. Though, if a write is not able to complete, that will return an IO error.
Mar
4
awarded  Caucus
Jan
18
awarded  Yearling
Dec
16
comment Li-ion and Li-po charger current leak from input pin
Does the manual mention any leakage of those pins?
Dec
16
comment How is an XOR with more than 2 inputs supposed to work?
Good clarification, thank you for putting the time in on researching the standards far more than I had.
Dec
15
comment How is an XOR with more than 2 inputs supposed to work?
@JoeHass, I've never used logisim, I primarily use LogicWorks; in which, a multi-input XOR behaves as I described above, odd number of true inputs is a true output. The wiki page on XOR (en.wikipedia.org/wiki/XOR) agrees that what I said is true as well. I also have never actually seen a multi-input XOR IC, so I cannot turn to datasheets to try and disprove what I said. Logisim seems to be the only thing that implements the multi-input XOR scheme with the logic "1 if and only..." If you can find another source, I will admit I am wrong and that there are multiple definitions of XOR.
Dec
15
comment How is an XOR with more than 2 inputs supposed to work?
There is no different point of view, both points are technically correct, however "1 if only if exactly one of the inputs is a 1" doesn't expand as you might think. When you cascade 2input XORs, each output feeding in to the pins of a third XOR this shows the above point. Multi-input gates are derived from their 2input primitives. Thus the 4input truth table is ((A⊕B)⊕(C⊕D)) which results in a final 1 output if there are an odd number of true inputs.
Dec
15
comment How is an XOR with more than 2 inputs supposed to work?
@root, actually, you asked "How should it behave?" You didn't ask why anywhere. This is a correct answer, it yields ((A⊕B)⊕(C⊕D)) which is the same as a 4input XOR, which is the same as multiple 2input XORs cascaded together.
Dec
15
comment Accidentally used plumbing flux on a PCB; How do I remove it to reuse the board?
Plumbing flux does essentially the same thing as soldering flux. I don't see why this is an issue unless the flux itself is conductive. It should not harm any of the metals and since its plumbing flux I doubt its meant to be cleaned up.
Dec
12
comment What is “VDCI” in terms of output voltage?
Can you provide any links that would suggest this? I have since spent a good amount of time searching for this link and have found nothing.
Dec
11
comment Pickit 3 and PIC18F46J53
There is no issue with individual packages, if one PIC model is supported, all form factors of it are supported. If you are not providing enough current, it could cause a whole rail to brown out, if your PIC is on one of these rails then it will not have a voltage high enough to program properly.
Dec
11
comment Pickit 3 and PIC18F46J53
I've suggested everything I have run in to in the past, if you run through everything I listed and are still having issues you may want to try posting more info here like your schematic. Maybe build another board or two to test with as well.
Dec
11
comment Pickit 3 and PIC18F46J53
@Rookie91 According to MPLAB X, the PIC18F46J53 is fully supported by the pickit3. Right click project->Properties, select device, red/yellow/green "lights" next to programmers in the pane show device support. Since you are using the pickit to power the PCB, make sure it can provide enough current.
Dec
11
revised Pickit 3 and PIC18F46J53
Clean up grammar
Dec
11
suggested suggested edit on Pickit 3 and PIC18F46J53
Dec
11
answered Pickit 3 and PIC18F46J53
Dec
11
revised What is “VDCI” in terms of output voltage?
added 176 characters in body
Dec
11
revised What is “VDCI” in terms of output voltage?
added 176 characters in body
Dec
11
answered Wood workbench as ESD protection?