Raspberry Pi Forums

Gert van Loo

> by Gert van Loo » Wed Feb 11, 2015 7:39 pm >> "Apart from the ARM processor nothing has changed on the Pi-2" >> > Why would it suddenly support two cameras? > What is it specifically that is different between the CSI and DSI implementations? They both use the D-PHY physical interface but have the...

Gert van Loo

Sorry to sound condescending but there are many, many ,many posts all saying
"Apart from the ARM processor nothing has changed on the Pi-2"
Why would it suddenly support two cameras?

Gert van Loo

Is your scope probe set to 50 Ohms or high impedance? (just asking....) In general the PI is GPIO is NOT designed to drive at high frequency signals. (>30MHz) The VGA, especially at high resolutions, is working at the edge if its capabilities. I would start with a low resolution and build up from th...

Gert van Loo

jamesh wrote:I believe the I2C is unchanged.

~~I believe~~ the I2C is unchanged

Gert van Loo

I am working on a new release. See also here: http://www.raspberrypi.org/forums/viewtopic.php?f=37&t=96395&p=686739#p686739 I am sorry: I just saw the "Miscellaneous notes and questions " section. Do these commands: 'Stop All', 'Execute Sync' and 'Emergency Halt' act on all boards simultaneously? Ye...

Gert van Loo

While I am updating the code I am adding a 'set baud rate' command. case 0 : 19200 case 1 : 38400 case 2 : 57600 case 3 : 115200 case 4 : 230400 I can't guarantee it all works fine in case 3 let alone 4 but at least you can try. The two lower baud rates are 'just because I can' The are not useful in...

Gert van Loo

Yep, found it. When setting the outputs I also touch the open-drain status bits. (They are always set to zero, disabling the opendrains) Working on a solution but I have no access to equipment to test this. I will try post now code on Saturday. That also fixes the "first step wrong on stepper-motor"...

Gert van Loo

I'll have a look at the SW. It may be a real bug. If so I will push out a new image ASAP.

-- Gert

Gert van Loo

mancity wrote:What happened to there definitely wont be another Pi for a couple of years

Not really happy if im honest, I know it's only a cheap device, but lying so blatantly to the userbase is ****.

Look up "Osborne effect".

Gert van Loo

findx wrote:I wonder if they've fixed the USB controller in this silicon so it doesn't need all that FIQ fun.

We could not touch the USB but the ARM has a special 'USB timer' I added as response to a request from the USB dive driver developer...

Gert van Loo

As usual: none-moderators do not see how much spam we block. If there is a link I always follow it because you never know what is at the other side. That also which means I have the distinct risk of landing on a site with viruses. Thus I have some heavy virus protection running on my PC and I hope i...

Gert van Loo

I see green were it should be red
I see blue where it should be green
I see white where it should be black.
All signals need to be inverted?
There maybe the possibility of a LCD colour look-up table but I am not sure if that is usable in this situation.
I have to ask an expert at Pi headquarters.

Gert van Loo

Joan has send me a PM about this. I can't help you with this. Although I did design that interface it was several years ago so I can't remember the details. I would normally go back and check the code and re-run the regression test simulations but as Broadcom has closed the department I no longer wo...

Gert van Loo

I will release more information over the weekend.

As promised.
The gertbot advanced guide (on the download page) has been updated with information about the board.
It also contains source code to operate the UART.

Gert van Loo

What information is available for people who want to try writing their own gertbot code? I will release more information over the weekend. The processor is a SAM3S2B (which anybody can read from chip) I will also post the UART code as it took me a looong time to get that running. (not the UART code...

Gert van Loo

I will see what is possible as this seems a very specific application which would benefit more from running the whole algorithm on the board. Beware that the ADC are not very fast (about 1 millisecond per sample) and that the DACs have only limited range. Furthermore I found that the DACs need to be...

Gert van Loo

I’m interested too in why board boots with IO pins 1-10 (or 0 to 9!) as Inputs (safer I would assume), yet I still measure 3v3 coming from them in this default state, with enough current to make a connected LED glow dimly Because, as the manual states: they have 4.7K pull-ups. That makes it easier ...

Gert van Loo

Open forum is best.
Are you using stepper motors?
I recently found an error in the stepper driver and I am preparing a new image to upload.

Gert van Loo

Donnyo, I will look into it all but at the moment I have no access to a development set-up nor to any test equipment. I looks like it will be a few weeks before that is resolved so I am afraid it may take me a while to come back to you. I know that I made some last minute changes to the drivers and ...

Gert van Loo

Just for reference you find attached the python code I used to verify the drivers.
This was not written for official release so you will not find a lot of comment
as to me the code is self explanatory, but it does show example usages of every function.

Gert van Loo

My Gertbot robot is working well with motors and the excellent low latency mjpg streamer via Python but I'm really stuck on how to set the J3 GPIO Pins in Python and wonder if some kind soul might please help. I'm fine with ordinary Raspi GPIO control but am really stuck with doing the same on the ...

Gert van Loo

4) After a long time your arm breaks.

That is : you device is working fine for a few hours/days/weeks/months but at some time starts failing.
I mention this as you may have an initial impression that everytings is fine. But then......

Gert van Loo

The Raspberry-Pi board itself has no real 'memory'.** Thus each time you plug in a different SD-card you start from a blank, empty clean sheet. (I wanted to say you start from scratch but that might have been confusing :P ). The SD-cards do NOT influence each other in any way. **Apart from the inter...

Gert van Loo

The GPIO pin has a very high impedance. Several Mega Ohms so you can ignore the load on the resistor network.
However if there are any other loads then you are right and they have to take that into account.

Gert van Loo

From what I can see that PCB has been produced WRONG. Via´s should be covered by a soldering mask and thus be immune to being placed next to connections. From what I see, it looks like your via´s are plain metal. This is a typical example of "A little knowlege can get you in a lot of trouble" Too ma...

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