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theres also robotshop.com for more complete assemblies
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Dec 23, 2014 18:33
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I've used a cheap Chinese DSO thing at work a few times, it works fine for what it is the biggest thing is that it's only grounded through your computer's USB port. if you are on a laptop it is a floating ground and you'll need to take great care with something plugged into the wall or else you blow out the USB ports and likely your mobo. we only used it on with usb/FireWire powered peripherals so it was just fine
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Dec 24, 2014 20:55
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eschaton posted:I was going by the last post in this thread on the 68 Katy and the other site linked from it which made me think running a >1 MHz bus onto a breadboard would be problematic. well if you have long looping wires you're making antennas which needless to say is bad
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Dec 26, 2014 06:41
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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 what's the Fourier transform of the unit step function?
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Dec 29, 2014 03:37
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Hed posted:basically at speed everything is a transmission line gently caress transmission lines and emc
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Dec 30, 2014 02:36
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fritz posted:it's going to have power @ all frequencies? was just getting at that if you want to analyze how good your square wave is you would need a significantly faster scope than you'd think if you just looked at the nyquist frequency this was covered by other posters in significantly greater details
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Dec 30, 2014 02:42
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Mido posted:generate wave forms, push them onto the DAC, pray the DAC characteristics aren't total poo poo depending on what you need this is more than sufficient
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Dec 30, 2014 17:28
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doing actual bit janitoring today, recording and decoding i2c transactions 
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Dec 30, 2014 18:45
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eh, I guess logic analyzers are also oscilloscopes
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Dec 31, 2014 00:48
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the $100 one I'm using has an analog channel, its more expensive cousins have the voltage waveforms available for all channels
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Dec 31, 2014 04:53
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$300? you can buy a real tektronix for $500
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Dec 31, 2014 16:49
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I run my test equipment through the world's most advanced operating system.
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Dec 31, 2014 21:39
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maniacdevnull posted:my current multi is the sparkfun knock off fluke that they got sued for they didn't get sued, customs seized them, fluke was contacted and was rather confused as to why customs seized the because they are very obviously not flukes there is no way that is a real fluke, it's either straight up counterfeit or if from the real factory failed qa or wasn't made with real parts
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Jan 1, 2015 04:20
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Base Emitter posted:apparently fluke trademarked yellow cases or some poo poo? the cases were red though which is what was ridiculous about it
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Jan 1, 2015 05:32
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Mr Dog posted:lol does it still break out GPIOs onto separate chips interfaced over I2C? this is like some black and white infomercial world poo poo
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Jan 6, 2015 18:11
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but wait, for $9.99 you get not one, but two SPI buses just pay separate shipping and handling
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Jan 6, 2015 18:12
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kwinkles posted:this sounds pretty rad. here is what i made with 12 full speed gpios: please tell me theres a speaker too
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Jan 9, 2015 16:40
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i feel like you're really missing the full beep-boop experience without a speaker
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Jan 9, 2015 21:17
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its so loving weird going from computers that have gigabytes and gigabytes of RAM and terabytes of hard drive space to cursing that your program is 128 bytes shy of fitting in your little 16bit micro controller somehow it fits with -O4 which is using a kilobyte less space than -O3. either ti is magic or its just randomly cut out parts of my code 
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Feb 2, 2015 23:48
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its ti's msp430 compiler
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Feb 3, 2015 15:15
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its included in CCS 6; my options for compilers are TI v4.4.2, TI v4.3.3 and GNU v4.9.1
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Feb 3, 2015 15:23
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Blotto Skorzany posted:'look at the asm' is always the right answer. in cases where it doesn't seem to be the right answer, you're asking the wrong question. yeah, i know, i was more tearing my hair out at being just over on flash
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Feb 3, 2015 16:28
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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 1-wire must have been developed on a dare
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Feb 12, 2015 07:14
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Mido posted:i2c me i'm the spy by wire
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Feb 12, 2015 07:25
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neg my chip select
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Feb 12, 2015 07:46
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those are communications related 
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Feb 12, 2015 08:31
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so i need to be able to program some simple little spi flash chips, whats the professional version of bus pirate/flashrom because thats slow as molasses
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Feb 15, 2015 07:29
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Barnyard Protein posted:the total phase aardvark is a pretty cheap spi/i2c host adapter that can do SPI @ 8MHz so wait the bus pirate is 8mhz, I have a 64Mbit flash. it shouldn't take 30 minutes to write. is this just flashrom being terrible?
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Feb 16, 2015 02:33
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Barnyard Protein posted:Yeah maybe its not the flashrom thats the problem. i googled "64Mbit spi flash" and this is the first data sheet i found. http://ww1.microchip.com/downloads/en/DeviceDoc/25036B.pdf yeah was working that out when you did the edit. the chip in question is actually the winbond equivalent, small spi flash chips are all very similar though when i said flashrom i meant the program flashrom which was originally intended for open source/free software crazy people to modify their motherboard's bios
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Feb 16, 2015 04:10
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64Mbit/115kbaud = 600s.
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Feb 16, 2015 04:37
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a bus pirate uses a usb serial port for all commands
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Feb 16, 2015 05:00
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flashcat looks like exactly what I want
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Feb 16, 2015 05:28
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so when you have a file which is literally called "raw binary file" you should just stream it bit by bit into a flash to be loaded later right wrong! its actually the wrong endianness! thanks altera
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Feb 19, 2015 04:33
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Bloody posted:fpga tooling is never good. well if you want to take a lot of breaks while its
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Feb 23, 2015 20:43
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Bloody posted:how on earth am i using an fpga toolchain released in the past year that does not support systemverilog, a thing that has existed for over a decade embedded tools are all terrible because as engineers we learn how to work around problems as a living
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Feb 24, 2015 21:45
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Bloody posted:i have now written thousands of lines of verilog in the past few days and other than annoyances like the above this has been less painful than i was expecting. trc.exe has stopped working
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Feb 24, 2015 23:36
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oh good still debugging is a bitch but thats true for MCUs too
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Feb 24, 2015 23:45
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Chill Callahan posted:where can i get a 24V 250mA 6 pin mini DIN power supply for this? $35 is cheap
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Mar 16, 2015 23:55
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Mr Dog posted:i am fpgas are amazing for relatively low run stuff
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Mar 17, 2015 23:59
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| # ¿ May 3, 2024 11:21 |
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Bloody posted:it isnt happening this morning you need to perform an exorcism on the FPGA, sorry
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Mar 18, 2015 19:47
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