Wednesday, 2015-04-29

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freqso, what's everyone doing to cool their minnows?00:15
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meflinI've decorated the box with glitter ( been bussy and lazy )00:16
freqhaha00:16
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freqso, my board stopped working02:42
aholler_maybe it was the glitter03:22
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Oglarunwarthog9: hello03:50
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xkonniwhats the maximal frequency i can use on gpios? wanting to control a step-motor and it seems to fail at a certain speed14:28
xkonniwith the a4988 controller, so i just step on a rising edge of the gpio14:28
ka6soxxkonni, this is highly variable depending on *other* processes running on the minnowboard Max.14:36
xkonniubuntu, idle. but still it seems the minnowboard is not reliable on high frequency gpio operations14:36
ka6soxno linux device is "reliable" at high frequency GPIO operations…you can use a tuned kernel ("Realtime") to get better deterministic results but Linux is not designed OOTB for high speed GPIO operations like are necessary for driving stepper motors14:39
xkonnisure, but there just might be some limit14:42
ka6soxfor reliable high speed operations you want to use a co-processor dedicated to doing *just* GPIO ops. FPGA, Microcontroller, or RT controller sub system on a SoC14:44
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prpplaguexkonni: despite what some dev board people tell you, GPIOs are not intended to perform specific functions such as bit banging PWM or other types of dedicated functions14:52
prpplaguexkonni: generally things like PWM, I2C, SPI and ADC are used with dedicated controllers so that they are not operating system bound14:53
prpplaguexkonni: if you are trying to control a stepper motor, i would suggest using a PCA9685 or similar based PWM controller14:53
prpplaguexkonni: you can purchase a wide range of them from companies like sparkfun and adafruit14:54
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prpplaguein case anyone missed it, there was an announcement on the mailing list that a new lure is available with mPCIe+mSATA - http://www.tincantools.com/MinowBoard_Max_Add-ons/Silverjaw_Lure.html15:23
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xkonniprpplague: okay, will have a look at the pca968516:01
prpplaguexkonni: http://www.adafruit.com/products/81516:02
xkonnialready there ;)16:02
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AshutoshDasHello warthog917:13
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* warthog9 waves at AshutoshDas 18:19
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ka6soxcalculus, how much works with the stock 3.18?21:13
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calculuska6sox: I got gpios working21:24
calculuswell, ethernet, microsd, etc still work21:24
ka6soxhow about SPI and I2C?21:25
calculusI haven't tried those yet21:26
ka6soxkk21:26
calculusI have an I2C device I can test with at some point21:26
ka6soxnow that I have an mSATA and the Silverjaw Lure I want to put something on…just not convinced of what distro yet.21:26
calculusI think it is a shift register or something so I can enable many leds21:26
calculusI also fixed ubuntu's silly thing of needing to use a keyboard to run fsck during boot21:29
ka6soxpublished someplace?21:32
ka6soxwarthog9, prpplague why do I suspect I'm going to need more than the 5V@3A I have available to run the Minnow + Silverjaw + mSATA?21:33
meflinnot sure of the spec';s but many PSU's suck at deliving rated21:34
ka6soxyes, I was afraid of that :P21:35
ka6soxwhich is why I'm probably not going to expect I can get another AMP out of this to run the mSATA21:35
ka6sox4.3W21:36
meflinif you have a lot of space there are old dc psu's that you can dial up things ...21:37
meflinmy works bench can do dc at 6-124v at 1-20 amps21:37
ka6soxI have a PS @ the office that I will have to see how much 5V I can suck out of it21:38
meflin1/2 a table and very very old school21:38
ka6soxthis one is about 6X6X921:38
meflinI belive its posible to power a sata drive with different power21:39
meflinif I'm reading that right it should work21:40
prpplagueka6sox: you might need more if you are using usb3 power to the max, and also using that gige mpcie card21:40
prpplagueka6sox: but the maths i did show that a standard setup should be fine with 3A21:40
ka6soxfor installation I am going to use USB2 Stick then put an OS onto the mSATA21:41
ka6soxmeflin, this is an mSATA drive on a Lure21:42
ka6soxso its sucking power from the Minnow21:42
prpplaguemeflin: http://www.tincantools.com/MinowBoard_Max_Add-ons/Silverjaw_Lure.html21:42
meflinthats a problem21:43
ka6soxProblem/Opportunity21:43
meflinall problems are21:44
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warthog9ka6sox: I've got an 8a or 10a supply on my desk22:30
warthog9not sure I'd recommend that in the general sense22:30
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prpplaguemeflin: not really a problem, the maths holds up for 3A unless you are really loading it out22:36
ka6soxokay I'll try this 3A supply22:40
ka6soxneed to update to 0.79 first22:40
ka6soxI bought the cable recommended by the docs…will try that tonight22:41
warthog9which cable?22:44
ka6soxUSB->Pin header22:47
ka6soxfrom element1422:47
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warthog9darn, freq isn't here23:41
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