Raspberry Pi Forums

Gert van Loo

Sending IR out is trivial. Receiving is much more difficult. (I looked into this as we had a customer request for the BCM2835 about that four week ago).

Gert van Loo

There are 8k or so registers on the SoC

Well not really.. Some individual blocks have more then 12k. In think we are closer to 130K registers. I am having fits of laughter think about somebody trying to reverse engineer this thing.

Gert van Loo

<t>The last one is the easiest: There is no ADC. For the rest: I have already had several emails from people wanting the data sheet from me. I would request all of you out there to be patient. Yes, I know the rapbery-Pi is the most exiting thing since the invention of the ice-cream but th...

Gert van Loo

<t>There are two problems with this. First for every high speed interface like SATA, PCIe etc. you will need a very fast data transfer over the GPIO pins. It just is not there. We can push e,g, the SPI to 50 MHz. but you will not get the Giga-bits required for those interfaces. ...

Gert van Loo

Not immediately.

You will not be the only one who wants that so I assume in due time somebody will make an SD-card image which starts a VNC session on the Raspberry-Pi immediately from boot-up. (There is a demo video somewhere of the Raspberry Pi running VNC ).

Gert van Loo

I have not found yet how to close threads.

I wanted to close the 'does it have audio in thread' but I could not find a control.

Gert van Loo

The specs on the audio codec show a mic in

That is not true, there is NO audio in. There is no audio codec.

Gert van Loo

That question has been asked many, many times. Please ready the FAQ or search for WIFI.

Gert van Loo

<t> (I'll be interested to see what happens to those when the people who wrote them log in). Nothing seen yet, all still seem to be stuck at 'guest'. Curious if this test shows my avatar. Edit: Yes it does! Edit2: logged out and in again, still all my post...

Gert van Loo

<t>When you look for them keep in mind that headers are often cut from larger sections. So you might not find 2x13 headers but have to use 2x26, 2x32 or even 2x72. To make your life a bit more complex: Male or female? What length? As I recently wrote: \"welcome to the wold of ele...

Gert van Loo

Because criticizing creates a feeling of superiority whilst praising is seen as self diminishing.
In reality it is a sign of lack of self confidence and self esteem.

Gert van Loo

L6203: two inputs. Both A and B low or both high = stop.
A low, B high : rotate one way.
A high, B low: rotate other way.
You can run PWM on either A or B to control the speed.

Gert van Loo

The PWM channels are controlled with 32-bit registers. You can easily get a accuracy of 0.001% with those.

Gert van Loo

<r>Fish tank heaters run from mains power don't they? See this thread for all the issues with that: <URL url="http://www.raspberrypi.org/for.....038;t=1298">http://www.raspberrypi.org/for.....038;t=1298</URL> I showed my mains board to a jamesh and he immediately suggested I added a t...

Gert van Loo

<r>Any nice and cheap solution to motor control would add another cool string to the Pi bow. I can think of four different motor controllers which each require different drivers: AC motors. DC motors. Stepper motors. Servo motors. Of those I would say AC are the m...

Gert van Loo

<t>Yes hardware is pretty hard to get right, but that is why we have a highly experienced team building the chips. Before we ship, we abuse our chips very, very much. In fact I am directly involved in the quality control of this one and we have not yet managed to get any of these chips to latch-up. ...

Gert van Loo

it is still more $/(flop|ips)
Actually it is not. You forget that the GPU has about 50x the calculation power of the ARM.
It is just very difficult to use

Gert van Loo

<t>I don't know what happened but my reply from an hour ago is not here! Again: I admit there is a SMPS inside the BCM2835 which supplied the 1V2. I did not want to make things more complex then required. You normally start with making the highest voltage switched, as it supplies the ...

Gert van Loo

<t>We have two PWM channels and they are currently used for audio. So to use them for a servo you have to disable the audio and you need PWM drivers. Alternative (or for more outputs) you can drive the GPIOs from the timer interrupt routine. That gives you ~1KHZ update. That should be enough if serv...

Gert van Loo

On these devices the benchmarks will be very deceptive. They greatly depend on how much SDRAM bandwidth your video is using. You will find that people who use the composite out (400x600 screen) have significant more ARM power then the ones using the HDMI screen (1080p60).

Gert van Loo

<t>That was on the alpha boards. We switched to LDOs because they are cheaper. Not many people noticed but we have dropped the 'it uses only one watt' statement. It was dropping that or raising the price. The price was more important. I also wrote an article why an LDO burns more power then a buck r...

Gert van Loo

<t>To me the main points missed on volume are these: 1/ The production was set up from the start to be in the 10K units, not 'thousand' 2/ Batches of 100K get cheaper so no need to 'raise the price'. 3/ If you start thinking in millions the commercial world can step in to fill any gap...

Gert van Loo

If it is hidden, how come I got several messages in the last two days?

Gert van Loo

<t>Only the maxim chip is a 'challenge'. Then I assume whoever builds them should have some solder experience. The rest is plain sailing. All components are relative 'big'. The board has solder mask so you have to screw up really, really bad to short anything out. The response thus far is good enoug...

Gert van Loo

<r>I am in two minds about this but here it goes: This weekend I made a tiny main-switch circuit board (The board is 55x55 mm, single sided and dedicated to control three Solid state relays, SIP4 footprint.) My biggest worry: If anybody dies using the circuit I will feel very bad. Als...

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