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by centralware
Tue Sep 11, 2018 2:22 pm
Forum: Device Tree
Topic: i2c-gpio dtoverlay bus number
Replies: 21
Views: 6951

Re: i2c-gpio dtoverlay bus number

Ran out of ideas to try. Updated the system to 4.14.21, 22, 24, 26 and 29 The following files were updated each time: *.elf *.dat overlays/i2c*.dtbo config.txt: dtoverlay bus 10 through 17 (tried with or without i2c=on) Boot script checks the existence of eth0 (which vanishes if bootcode/Broadcom fi...
by centralware
Tue Sep 11, 2018 1:02 pm
Forum: Device Tree
Topic: i2c-gpio dtoverlay bus number
Replies: 21
Views: 6951

Re: i2c-gpio dtoverlay bus number

Attempting to back-port to 4.4.21.
Thank you for the tip! It made hunting through the hub's history a little less daunting! :)
by centralware
Tue Sep 11, 2018 11:14 am
Forum: Device Tree
Topic: i2c-gpio dtoverlay bus number
Replies: 21
Views: 6951

Re: i2c-gpio dtoverlay bus number

Good morning, Phil! Okay, we're half way home! (Turns out my update script had an oops... went to overlays directory, did it's thing... went to update start*.elf and friends and somehow I failed to tell it to go back a directory, so my elfs ended up in overlays :/ ) NOTE: Once the updates were doing...
by centralware
Mon Sep 10, 2018 7:48 pm
Forum: Device Tree
Topic: i2c-gpio dtoverlay bus number
Replies: 21
Views: 6951

Re: i2c-gpio dtoverlay bus number

start.elf: VC_BUILD_ID_TIME: 18:41:29 VC_BUILD_ID_TIME: Apr 4 2017 dtoverlay: * No help found for overlay 'i2c-gpio' NOTE: Using TinyCore Linux thus things like the dtoverlay binary aren't part of the base operating system. Additionally, I threw together an "update" script which basically loops thro...
by centralware
Mon Sep 10, 2018 2:51 am
Forum: Device Tree
Topic: i2c-gpio dtoverlay bus number
Replies: 21
Views: 6951

Re: i2c-gpio dtoverlay bus number

RasPi 2B (chosen against 3B just due to both act/pwr_led_gpio options) Updated firmware overlay/*.dtb* files against github earlier today as a precaution. config.txt contains dtparam=i2c=on dtoverlay=i2c-gpio,i2c_gpio_sda=25,i2c_gpio_scl=24,reg=9 (and tried bus=9) both to no avail After probing i2c-...
by centralware
Wed Jan 25, 2017 1:29 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Shared I2C Slaves With Multiple Pi?
Replies: 11
Views: 2422

Re: Shared I2C Slaves With Multiple Pi?

Easier : This may be true in a networked environment, but in some instances ethernet isn't going to be an option thus I need to consider more "direct" approaches where applicable. Also bare in mind that the OS being utilized is very "bare bone" (Tiny Core Linux with a custom kernel and boot image) ...
by centralware
Tue Jan 24, 2017 6:10 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Shared I2C Slaves With Multiple Pi?
Replies: 11
Views: 2422

Re: Shared I2C Slaves With Multiple Pi?

DougieLawson wrote:You'd also need to tie all the board ground lines together to prevent stray voltages causing strange effects on the I²C bus.
Feedback ("stray voltage") is tended to in the description above - all boards and devices are fed from the same regulated power supply.
by centralware
Tue Jan 24, 2017 6:07 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Shared I2C Slaves With Multiple Pi?
Replies: 11
Views: 2422

Re: Shared I2C Slaves With Multiple Pi?

@mikronauts: Thank you for your reply. Yes, after six hours of researching/"Googling" IIC protocol at the driver level, sadly, specifying Raspberry Pi in the search query made the results limiting to a fault; removing Pi from the equation I finally came across MultiMaster protocols which are not int...
by centralware
Tue Jan 24, 2017 4:44 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Shared I2C Slaves With Multiple Pi?
Replies: 11
Views: 2422

Re: Shared I2C Slaves With Multiple Pi?

Any hint as to the why it's not possible would be very helpful. (Theoretically, using a shared GPIO to act like an RTS signal, I've already come up with a possible way to prevent cross-talk between masters, I just haven't put a test cluster together yet to prove concept.) Having a single Pi within t...
by centralware
Tue Jan 24, 2017 4:28 pm
Forum: General discussion
Topic: Power supply for Raspberry Pi 3 cluster
Replies: 15
Views: 8593

Re: Power supply for Raspberry Pi 3 cluster

Suggestion for all of those who want to power multiple Pi's with a single source: Use an over-the-counter computer Power Supply; just take into account how many Pi boards (and accessories) you'll be using and look at the PSU to determine the amperage of the positive 5V rail(s). The "safe math" would...
by centralware
Tue Jan 24, 2017 3:33 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Shared I2C Slaves With Multiple Pi?
Replies: 11
Views: 2422

Shared I2C Slaves With Multiple Pi?

Would it be possible to connect multiple RasPi boards (I2C bus) to, say, a single Real Time Clock where the RTC could be polled by each of the Pi's separately? Theoretical Layout: * A dozen or so RaPi2B/3B boards * One or more I2C slave devices * All devices powered by the same supply I don't have R...
by centralware
Fri Apr 03, 2015 9:07 am
Forum: Troubleshooting
Topic: USB HDD not detected [RPi 2]
Replies: 4
Views: 4851

Re: USB HDD not detected [RPi 2]

RE: USB3 The details refer to a "standard pc" (where 500ma is assumed to be the LEAST available current (if the drive is backward compatible to USB2) as many/most USB3 channels feed directly from the PSU and not the bus) and thus why many of our USB2/USB3 devices here which are 2.5" drives will work...
by centralware
Thu Apr 02, 2015 10:39 am
Forum: Troubleshooting
Topic: No LED activity: have I killed my Pi?
Replies: 3
Views: 596

Re: No LED activity: have I killed my Pi?

When soldering on virtually any prefab board: Using masking tape, mask the area you'll be working with by covering around the work area well enough to where solder spots are more likely to splash on the tape rather than the board. Using a magnifying glass (I use a head-band type of light/magnifier) ...
by centralware
Thu Apr 02, 2015 10:08 am
Forum: Troubleshooting
Topic: USB HDD not detected [RPi 2]
Replies: 4
Views: 4851

Re: USB HDD not detected [RPi 2]

On the 2.5" HDD model, it's USB powered but implied you're using a USB3 socket (with up to 500ma power.) Pulling power from a 2.1A power supply for both the Pi, your wireless... AND the hard drive is likely going to be a stretch. * With the Pi turned on, place the drive enclosure next to your ear an...
by centralware
Thu Apr 02, 2015 9:39 am
Forum: Troubleshooting
Topic: Pi2B Power Requirements
Replies: 0
Views: 171

Pi2B Power Requirements

I have an array of Pi (14 total) feeding from a 500W computer PSU with a 5v 35A rating, assuming the Pi draws ~700ma each (probably idle, so I rounded up to 1A for each board, or 14A in total.) The total count of PIs will end up being 18 in the end; 2 "master" or control units which will be on their...

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