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AndrewS
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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 12:05 pm

Burngate wrote:
gordon@drogon.net wrote:Although 28-31 are gone, their functions can be found on the additional pins.
As for the GPIOs 28-31, I'm now confused. I think I need to revisit the spreadsheets to unconfuse myself
Does http://elinux.org/RPi_BCM2835_GPIOs help? Or is there a way in which it could be made less confusing?

On the Model B Pis, the I2S interface is available on the (additional) P5 header using the ALT2 setting of GPIOs 28-31. On the Model B+ Pis, the I2S interface is available on the (main) J8 header using the ALT0 setting of GPIOs 18-21. (Link-tastic! :D )

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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 12:09 pm

fruitoftheloom wrote:I am absolutely sick and tired of the I WANT posts and apologies if offended anyone. :shock:

Everytime the RPF Blog something new it is full of detractors which 2000% spoils everything :twisted:
Even Liz wants a quad-core processor and RTC ;)
http://www.raspberrypi.org/introducing- ... ent-957515
:lol:
(removes tongue from cheek)

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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 12:11 pm

AndrewS wrote:
fruitoftheloom wrote:I am absolutely sick and tired of the I WANT posts and apologies if offended anyone. :shock:

Everytime the RPF Blog something new it is full of detractors which 2000% spoils everything :twisted:
Even Liz wants a quad-core processor and RTC ;)
http://www.raspberrypi.org/introducing- ... ent-957515
:lol:
(removes tongue from cheek)
ROFL :)
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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 12:47 pm

"I am absolutely sick and tired of the I WANT posts and apologies if offended anyone."

Weren't some of the 'improvements' to the Pi B+ brought about by some peoples wants ? :D

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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 12:49 pm

Will it be possible to turn power to the USB ports off?
I am having problems with a USB GSM modem and the only way to reset it is to turn it off and on again?
I think this is not possible on the normal model B?

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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 12:54 pm

vthielen wrote:Will it be possible to turn power to the USB ports off?
I am having problems with a USB GSM modem and the only way to reset it is to turn it off and on again?
I think this is not possible on the normal model B?
Yes.

The 9514 hub's power control is hooked up to the USB power switch. Sending a control message via USB can power it off/on.

http://askubuntu.com/questions/149242/i ... rom-ubuntu
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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 1:02 pm

jdb wrote:
vthielen wrote:Will it be possible to turn power to the USB ports off?
I am having problems with a USB GSM modem and the only way to reset it is to turn it off and on again?
I think this is not possible on the normal model B?
Yes.

The 9514 hub's power control is hooked up to the USB power switch. Sending a control message via USB can power it off/on.

http://askubuntu.com/questions/149242/i ... rom-ubuntu
Are you sure?

I just tried it with:

Code: Select all

echo 0 > /sys/devices/platform/bcm2708_usb/buspower/
and its powered down the hub/ethernet chip but the 2 things (Pi's) I have plugged into the B+ USB sockets are still running.

-Gordon
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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 1:20 pm

The USB ports need a power switch controlled by the LAN9514 to turn of the power to each port. Presumably these are not included.

EDIT: Something like this
USB-power-control.png

MrEngman
Last edited by MrEngman on Tue Jul 15, 2014 1:27 pm, edited 1 time in total.
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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 1:23 pm

Hello,

Just got mine and noted on the leaflet that came with it:-

Red rag to a bull!

Regards
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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 1:29 pm

gordon@drogon.net wrote:
Are you sure?

I just tried it with:

Code: Select all

echo 0 > /sys/devices/platform/bcm2708_usb/buspower/
and its powered down the hub/ethernet chip but the 2 things (Pi's) I have plugged into the B+ USB sockets are still running.

-Gordon
That "powers off" the root port, which has the effect of doing nothing since the vbus pin is not brought out on the Pi. Downstream devices are disconnected, though (and should revert to the pre-configuration maximum current draw of <100mA).

Hubs do not disconnect downstream power on an upstream port suspend/disconnect event (usb2.0 spec 11.5.1.2).

Edit: I am deleting further off-topic posts. This is a Q&A thread, not a ramble.
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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 2:03 pm

I'm very interested in the Secondary Memory Interface (SMI), and I know I'll have to wait for the specs for it.
The SMI bus is using GPIO0 and GPIO1 (ID_SD and ID_SC, SA5 and SA4 in SMI).
So, will it be possible to use SMI after its documentation is made public?
Or, can GPIO[0,1] be used for other purposes than the I2C0 bus?

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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 2:36 pm

Can we have a B+ section in Hardware, please?

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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 2:41 pm


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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 2:47 pm

AndrewS wrote:
PiGraham wrote:Can we have a B+ section in Hardware, please?
http://www.raspberrypi.org/product/model-b-plus/
http://www.raspberrypi.org/documentatio ... /README.md
:?:
I mean in the forum, for discussion.
Like this one:
http://www.raspberrypi.org/forums/viewforum.php?f=98

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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 2:50 pm

na, we Don't have a Model A or Model B or Model B Rev one forum - ....
the CM is so much more different
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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 2:53 pm

Actually, it could be more general for my current interest in the B+.
Where to post about power consumption of any model?

There should be somewhere more appropriate than general discussion.
http://www.raspberrypi.org/forums/viewt ... on#p578198

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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 3:04 pm

Anyway, I received a B+ this morning! Thank you Farnell.
With the switch mode PSU on board it will boot to login prompt on as little as 2.6V into the micro USB.
USB peripherals on the Pi ports are unlikely to work, and I don't know what works on the Pi itself, but it will boot and drive HDMI.

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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 3:18 pm

Just placed an order with newark.com.
Ten minutes later I saw that a near by computer store has the B+ same price!
So I'll have two pies in 2-3 days.

Hope the new one doesn't freeze or fail to reboot.
Antikythera

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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 3:22 pm

Thank you RS received the B+ and a 2A PSU this afternoon.

Overclocked to high, have cheap USB Mouse and Keyboard as well as a generic RTL8188CUS WiFi Adaptor installed.

Started with a NEW Raspbian Wheezy Image and it is very stable, no WiFi dropouts, no reboots. All good :D

Thank you RPF for a great evolution of the Pi and looking forward to a few years use and Raspbian Jessie Stable :)

Thank you to all the people who have updated the Kernel and Raspbian over the last couple of years ;)

Bluetooth USB Dongle will be added later to test the new power circuitry........
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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 3:33 pm

fruitoftheloom wrote:Thank you RS received the B+ and a 2A PSU this afternoon.

Overclocked to high, have cheap USB Mouse and Keyboard as well as a generic RTL8188CUS WiFi Adaptor installed.

Started with a NEW Raspbian Wheezy Image and it is very stable, no WiFi dropouts, no reboots. All good :D
Did you set the USB high power option?
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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 3:39 pm

gkreidl wrote:
fruitoftheloom wrote:Thank you RS received the B+ and a 2A PSU this afternoon.

Overclocked to high, have cheap USB Mouse and Keyboard as well as a generic RTL8188CUS WiFi Adaptor installed.

Started with a NEW Raspbian Wheezy Image and it is very stable, no WiFi dropouts, no reboots. All good :D
Did you set the USB high power option?
Not yet, wanted to see how far could push with a Standard High CPU Overclock and USB Ports populated...


FI max_usb_current = 1 https://projects.drogon.net/testing-set ... berry-pi-b
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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 3:54 pm

gkreidl wrote:
fruitoftheloom wrote:Thank you RS received the B+ and a 2A PSU this afternoon.

Overclocked to high, have cheap USB Mouse and Keyboard as well as a generic RTL8188CUS WiFi Adaptor installed.

Started with a NEW Raspbian Wheezy Image and it is very stable, no WiFi dropouts, no reboots. All good :D
Did you set the USB high power option?
Shouldn't need to with those devices.
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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 4:15 pm

AndrewS wrote:
Burngate wrote:
gordon@drogon.net wrote:Although 28-31 are gone, their functions can be found on the additional pins.
As for the GPIOs 28-31, I'm now confused. I think I need to revisit the spreadsheets to unconfuse myself
Does http://elinux.org/RPi_BCM2835_GPIOs help? Or is there a way in which it could be made less confusing?...
Unless you can manage remote brain surgery, I'll have to go for the DIY option

Thanks, anyway.

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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 4:31 pm

Sorry in advance if I missed the instruction, but I found I had to rpi-update the kernel in order for usb and ethernet to work with my default SD card after transferring it from my B. It was running a version from last January, so I should of known.
Texy
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Re: The Raspberry Pi Model B+ Q&A thread

Tue Jul 15, 2014 4:38 pm

[IDE cables with key on pin20]
FTrevorGowen wrote: Having checked the B+'s pinout it looks as if pin 20 is (one of the) a "Gnd" pin, so may possibly be removed to "polarize" the connection?
Oh that's handy even if only by accident ;)
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