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at my last job I got the go ahead to get a Freescale k60 going from scratch with a minimal tool chain, so I could learn I took the k60 programming reference and arm-none-eabi-gcc and made my own linker script and startup code that did things like initialize static variables and set up the multipurpose clock generator and stuff it's a good learning experience that teaches you why C is kind of a mess. when you are writing code you have to think about the hardware, the linker, the syntax, and your own code domain, standard libraries that may or may not actually be doing what you think I did a minimal amount of googling to force myself to really learn how to find answers for my weird questions 10/10 would recommend, I am now a mild embedded wizard
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Nov 27, 2014 03:11
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in my dumb opinion it's okay to waste cycles on simple applications in projects that don't need to scale or multi task much. get something done. optimize when it's time. structure your code base well so you can refactor your inefficiencies later
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Nov 27, 2014 03:17
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I watched highly skilled engineers lose their loving minds over optimizing the gently caress out of things we didn't even really need I just wrote a huge rambling essay about some architecture horrors I lived through during my time in embedded but decided to summarize it as follows "if you have too many things going on for a cooperatively multi tasked series of services to work reliably, you should drop an actual RTOS on there and move on. do not make your own."
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Nov 27, 2014 04:18
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kwinkles posted:i read this and i think: faaaaaaart I was talking about software project and dependency structuring not the on die architecture 
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Nov 27, 2014 04:41
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are there x86 core MCUs that have the same kind of features as say a Kinetis K60 series? I've never looked the Kinetis is a monster with a fuckload of peripherals and gating options for power consumption and a pretty good cross bar thing that reduces contention when peripherals are doing DMA
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Nov 27, 2014 04:50
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I remember losing my mind for a month trying to get USB going on a Freescale MCU, I gave up and moved onto validating other features like SDIO a week into SDIO I figured out that I wasn't enabling the loving DMA security bit on the MMU I think it was. SHITTTTTTTTTTT but it was too late and I couldn't go back and fix it, now I don't work there and I still think about the USB that could have been
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Dec 5, 2014 07:03
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Tin Gang posted:re-teaching myself microcontrollers update: I have received the texas instruments tm4c1294 launchpad and managed to program an led to blink on and off with some example code. very satisfied so far. keep it up, soon you'll be ilghting up the skies 
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Dec 7, 2014 01:55
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Blotto Skorzany posted:now, program it... to love no dont it will only be disappointed
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Dec 7, 2014 04:11
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Mr Dog posted:Write a linked-list library, then create a linked list of function pointers protected by nestable IRQ enable/disable commands. the last year of my life at my old job in a nutshell the CEO's brilliant solution??? micro python (https://micropython.org/), using the generator pattern as a tasking system so that we can keep state without writing gnarly code yes sir i was paid to make this poo poo run on a k64 and start hooking up bindings yes i want to die
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Dec 12, 2014 23:56
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longview posted:i should probably clarify that the serial data is 4800 baud and the DMA would just be for a laugh, with ~20 mips of pure integer processing power I can bit bang this no problem but i don't want to repurposing SPI is a fun and attractive thing to at least try
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Dec 13, 2014 18:09
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Tin Gang posted:this thing's been sitting around forever and I finally tested it. it works fine awwww
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Dec 22, 2014 21:04
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Jonny 290 posted:do we need a separate surplus thread, or should i just megapost megapost
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Dec 24, 2014 02:30
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http://www.rigolna.com/products/dig...bsyZRoCZGfw_wcB i got this one for $300 from a coworker, at least i think it's the 100mhz one and not the 50mhz, not remembering it has been extremely needs suiting as an intro scope, i have troubleshooted many a bus with it, it can log the data to a FAT thumb drive and do some basic FFT stuff as well research the UIs on digital scopes before you buy em because some are REALLY bad, said coworker sold it to me because he was getting a "better" one, which has a faster sample rate and stuff, but the UI is so bad that he regretted the hell out of it a cyberpunk goose fucked around with this message at 21:31 on Dec 24, 2014 |
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Dec 24, 2014 21:27
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Olivil posted:If you guys buy a cheap chinese scopes (Rigol DS1054Z for instance, honestly thats quite a good scope for the price), google around and you might find some keygens to upgrade your scopes for free i have a rigol in this series :0
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Dec 24, 2014 21:32
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Olivil posted:RIGLOL thanks for the pro tips, ill verify the model number and stuff when i get home
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Dec 24, 2014 21:34
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Jonny 290 posted:i need one bad right now because we're about to build Radio Free YOSPOS and i need to troubleshoot HF RF circuits and filters there's an extreme radio nerd in the projects thread
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Dec 24, 2014 21:38
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Captain Foo posted:I really don't even know what an ossciloscope is or measures but it seems cool as hell you hook up probes to the inputs you connect probes to loops or conductors you can now visually map the electrical characteristics of a conductor on a screen you can configure trigger points when certain edges or thresholds occur, so yo ucan capture pulses of logic happening at realtime for example you might have three bus lines, one clock, one data, one chip select when you program the SoC to send some data, it pulls chip select low, clock/data wobble around between 3.3v and 0v (or whatever signal voltage), when it's done transmitting it puts chip select back up at 3.3 to troubleshoot the data you can set up a trigger on the chip select line going high and leave the other line just watching data, you send the data, the scope triggers on that moment in time that the chip select line changed, now you can look at what happened
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Dec 25, 2014 02:02
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Tin Gang posted:imagine you're reading a circuits voltage, and simulatenously you're drawing with a pencil horizontally across a piece of graph paper at a constant speed. now while moving the pencil is moving horizontally at the constant speed, you move it vertically up or down to match how high or low the voltage is move the pencil to the left the more pain you feel, back to the right the less you feel *hooks up electrodes* *starts paper conveyor*
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Dec 25, 2014 03:11
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Bloody posted:Oscilloscopes enable time domain visualization of electrical signals. The more you spend, the finer the time domain detail you can see. You can see both voltages and currents. Fancy models can do Fancy things, like frequency domain analysis or other complex maths. no, gently caress scopes are window dressing when a cute lady comes over and sees your shelves of bench supplies and various scopes and your set of $1200 active probes and a mess of probes standing up out of test points on a board you are pretending to be debugging -- she will fall for you
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Dec 25, 2014 09:30
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longview posted:when you move up to spectrum analyzers and storage scopes their clothes literally fall off right there my scope has some storage  no real spectrum analyzer though, beyond some basic fft bullshit
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Dec 25, 2014 21:28
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no wonder im single
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Dec 25, 2014 21:29
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eschaton posted:surplus post would be a nice yosmas present Paging yosposter Raluek, paging Yosposter Raluek please report to low level thread
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Dec 26, 2014 09:03
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Tin Gang posted:can someone help me pick out a display to buy to hook up to a microcontroller? previous experience: making a single 7-segment display spell out "yourE gAy" one letter at a time. adafruit makes arduino libraries for all their screens as far as I know, I had a 96x64 oled that I was able to easily get bmps pushed out onto and do some sprite animations for a dumb gift
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Dec 27, 2014 20:57
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fritz posted:im a mathematician who snuck into signals and hardware thru a couple of end-arounds, i don't really understand this post but i feel like i should digital signals are defined by logic highs and lows and once you get to high rates of throughput the electrical characteristics of the traces and parasitic effects start to interfere so you must design around this and pull a lot of rabbits out of your rear end I'm not an EE but I hope that explanation is more or less accurate
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Dec 29, 2014 10:32
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Olivil posted:whats a good cheap (<200$?) function generator? an arduino 
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Dec 30, 2014 08:14
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Olivil posted:please proceed i must have a spare uno somewhere generate wave forms, push them onto the DAC, pray the DAC characteristics aren't total poo poo
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Dec 30, 2014 08:24
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Jonny 290 posted:Old Dudes:
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Jan 6, 2015 06:38
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hobbesmaster posted:but wait, for $9.99 you get not one, but two SPI buses just pay separate shipping and handling lol if your soc only has two spi controllers, spend the extra $0.35 get a monster
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Jan 6, 2015 18:13
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Jonny 290 posted:im almost assuredly not going to buy this right now but lemme get a thumbs up/down on this one just so i can get an idea of the market $75 is the real price for that imo
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Jan 7, 2015 16:47
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yeah i picked up an entry level rigol and it's fine for the dumb poo poo i need to do, iirc it's the 50mhz one and someone here was saying the 100mhz and 50mhz are the same ones you can just flash it, but i think ill wait till i actually need it added bonuses are things already mentioned, but you can get waaay fancier triggers for debugging bus logic stuff, also you can do FFT visualization if you need to
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Jan 7, 2015 21:50
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Bloody posted:The only time I used a rigol it's ui was a laggy terrible piece of poo poo is that still the case the one i have is no problem but as i've described before: i bought my entry rigol off a coworker who was upgrading to a bigger fancier rigol which has a loving awful interface mine has no issues i can think of really. the UI gets a little cuttered when you are 2-3 layers deep in a setting but it's fine and responsive
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Jan 7, 2015 22:16
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look up videos of the rigol model you are interested in because there are some thorough youtube reviews of scopes
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Jan 7, 2015 22:17
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Sagebrush posted:I really like the look of the rigol 2072 or whichever one is the $800 one with the fast update and density plotting to look like an analog scope https://www.youtube.com/watch?v=TRy755StMak omfg its a monster
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Jan 8, 2015 00:38
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 that waveform display rate
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Jan 8, 2015 00:39
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i really want that scope now but i am literally not smart enough to be involved in any project where i'd need something that monstrous
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Jan 8, 2015 00:39
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wesley snypes posted:
requesting this be a 3d animation with this music https://www.youtube.com/watch?v=gBqGC9sVBXY&t=51s and the skull slowly slipping out of th screen
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Feb 12, 2015 06:54
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Jonny 290 posted:yeah iirc 1-wire devices leech power from the bus during downtime and their energy cap is measured in nF i think [ASK] me about bit banging 1 wire read and writes with nothin but Texas Instrument's p. decent documentation
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Feb 12, 2015 07:16
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with a bit of fiddling you can keep a 1wire device dead without power draw
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Feb 12, 2015 07:18
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eschaton posted:there's a lot you can kill with a bit of fiddling i2c me 
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Feb 12, 2015 07:25
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hobbesmaster posted:i'm the spy by wire master in slave out if you know what i mean
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Feb 12, 2015 07:27
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