Editing Blinking Blues
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− | + | Having some trouble with arduino blink. Will write up here. Draft now, not enough to really be of use to anyone but me. | |
= Origin = | = Origin = | ||
− | I have been messing about with steppers and simple drivers for some time. Recently I put a logic | + | I have been messing about with steppers and simple drivers for some time. Recently I put a logic analizer into use and noticed that the switching wave forms were a bit off. Simplifying this I went back to the basic blink and took a look at it. It also had some anomolies. This began an investigation of various blink code and the results. So far I have not found code that gives good results. In this investigation I am focusing on using pulses with half periods of 500 and 5000 micro ( not milli ) seconds. |
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= Blink = | = Blink = | ||
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The blinks I worked with for this investigation were all in the 1 to 10 ms or so period time frame. I used only the microsecond built in functions. I expected that the timings would: | The blinks I worked with for this investigation were all in the 1 to 10 ms or so period time frame. I used only the microsecond built in functions. I expected that the timings would: | ||
− | * be repeatable in the range of a few microseconds | + | * be repeatable in the range of a few microseconds. |
− | * be accurate in the range of 10 to 20 microseconds | + | * be accurate in the range of 10 to 20 microseconds. |
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== What I Found == | == What I Found == | ||
* I found glitches in the waveform of up to 1 or more milliseconds ( 1000 microseconds ) | * I found glitches in the waveform of up to 1 or more milliseconds ( 1000 microseconds ) | ||
− | * Often the glitches would repeat every 81.92 milliseconds or so. Interestingly enough if I divide this time by 16 | + | * Often the glitches would repeat every 81.92 milliseconds or so. Interestingly enough if I divide this time by 16 e 16 I get 512 which is more or less a magic number. |
== What I Tried == | == What I Tried == | ||
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=== Issues Investigated === | === Issues Investigated === | ||
− | * Was the logic sniffer the glitched one: Do not think so, I generated a square wave on an | + | * Was the logic sniffer the glitched one: Do not think so, I generated a square wave on an ossicalator at 1KHz ( period 1 ms ) and looked for glitches in it. Nothing found. |
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== Things Yet to Try == | == Things Yet to Try == | ||
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= Some Results = | = Some Results = | ||
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− | + | [[File:measure1.gif]] | |
== More Results in Files == | == More Results in Files == | ||
− | + | * Arduino Code -- I keep adding to it, but the old subroutines that have been timed are not changed. | |
− | + | * Results spreadsheet | |
− | * Arduino Code -- I keep adding to it, but the old subroutines that have been timed are not changed. | + | * Sniffer project files. |
− | * Results spreadsheet | ||
− | * Sniffer project files. | ||
= Test Setup = | = Test Setup = | ||
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Logic sniffer is the dangerous prototypes single board device http://dangerousprototypes.com/docs/Logic_Sniffer_101 | Logic sniffer is the dangerous prototypes single board device http://dangerousprototypes.com/docs/Logic_Sniffer_101 | ||
− | Measurement taken using the cursor measurement, finding some good pulses at the beginning and then visually scanning, then measuring for bad pulses later on. All recorded to a spreadsheet, that | + | Measurement taken using the cursor measurement, finding some good pulses at the beginning and then visually scanning, then measuring for bad pulses later on. All recorded to a spreadsheet, that will be uploaded here. |
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= Who I Told = | = Who I Told = | ||
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== Not Yet, but On My List == | == Not Yet, but On My List == | ||
= Links I Looked Over = | = Links I Looked Over = |