Raspberry Pi Forums

Dave_G_2

[Moderation by Abishur] I deleted a couple posts because they were off topic and personally attacking each other rather than discussing the issue. As Gold Five from Star Wars said, "Stay on target" abishur, if you are going to delete insulting posts, then please do it properly. The original offendi...

Dave_G_2

This is a warning to both sides. This thread is not another thread discussing the pros/cons of open vs closed source so please drop the debate and get back on topic or I'll close this thread (the OP is free to start another thread about this project if they cannot escape the open/closed source deba...

Dave_G_2

I suspect a lot of the disconnect people have here is driven by the difference between the business of computer programming, and the study of computer science. The R-Pi can cater for both. ...but is intended for one. Says whom? Read the statements by the Foundation members again. Exactly, got anyth...

Dave_G_2

It's not "you must", it's a choice that you have. and I have made mine. I suspect a lot of the disconnect people have here is driven by the difference between the business of computer programming, and the study of computer science. The R-Pi can cater for both. Business has always, more or less, kep...

Dave_G_2

rurwin wrote:Let me make another point. I've an argument stewing away with DexOS, because we disagree on just about everything, but enough said.

Naughty DexOS, when will he realize that rurwin is always right!

Dave_G_2

I really can't understand this whole "you must share your source" stuff which seems to be mainly a Linux thing. With Windows software, it's the exception rather then the rule that source code is supplied with free software but somehow as soon as it has anything to do with Linux, it's expected. Along...

Dave_G_2

rkr wrote:@Dave Your points are rather nitpicky. Idk but it still doesn't make much sense.

Nitpicky?
You asked, I gave you an answer as to why use a Pi.

Dave_G_2

To make a usable system you will likely end up with at least 1MB if you omit any graphics support, and this is with just a simple shell and the needed shell commands (Absolutely no extras). More then acceptable. Add a shell, gcc, python and a couple of extras and probably land up with 50 or even 80...

Dave_G_2

nick.mccloud wrote:Most of that 1.9Gb is thin air - a side effect of the way that dd works

Fair enough, any idea how much is actually real data (bloat or other wise)?

Dave_G_2

@rkr You are of course correct that one can learn to code on a X86 based system running either Win or Linux. However the advantage the R-Pi has over X86 based systems is the portability/small size and of course ARM architecture is very popular for portable devices and as such consumes much less power.

Dave_G_2

While the n*x based systems definitely have there advantages, Linus has even said that Linux has become bloated (and that is just the kernel). Couldn't agree more. As an example, just look at the Debian distro for the R-PI. (Haven't even looked at Arch). It's 480MB when zipped and explodes to over ...

Dave_G_2

rurwin wrote:That's a perfect example of obtuse programming, Dave

It gets the job done, adds extra functionality, can be used for checking computational time
and offers an alternative to Python.
It can also be exported to GTKdialog amongst others.

Dave_G_2

@tufty To me it seems your example is motivated by revenge rather then goodwill. We all give and take in different ways and giving away the source code is not a prerequisite to giving back. This particular example was and is, I will admit, motivated to a certain extent by rancour against the artifi...

Dave_G_2

Why not use bash & bc ? I don't know if the R-Pi has bc. This is the script I found on my Linux box. Save the script below as pi.sh and give it exec permissions: Then type: ./pi.sh NumDecimalPoints (where NumDecimalPoints is er...well self explanatory) Keep in mind that a number like 5000 took 35.78...

Dave_G_2

@tufty To me it seems your example is motivated by revenge rather then goodwill. We all give and take in different ways and giving away the source code is not a prerequisite to giving back. We all use apps such as text editors, hex editors, web browsers and so on and in many cases the source code is...

Dave_G_2

His C program is directly accessing the registers - no device driver in there at all. Now that you mention it, I agree. I just skimmed thru his code and forgot that GPIO_CLR and GPIO_SET are declared in some .h file. Re-coding in assembler might save a cycle or 2, but not 10mS. It would still be an...

Dave_G_2

@Grumpy Mike

What does your kernel report:

Code: Select all

strace -tt YourPgmName

It would also be very interesting to see if there is any significant time difference
if the app was coded using ASM and accessing the registers directly thus bypassing the drivers.

Dave_G_2

rurwin wrote:....or get another TV

The OP is running composite video so any TV will be the same.
The 480X360 is the limiting factor and a larger TV will not magically add more pixels.

Dave_G_2

@jubber
You should have used an old shoe box instead.
That way you could have avoided getting the boot.

Dave_G_2

@jubber

Now your second project should be a dog box.
You're gonna need it.

Dave_G_2

Burngate wrote: As for complaining about RS / Farnell on here being a hanging offence, this forum is dedicated to identifying the complainers so they can be moved to the back of the queue.

and possibly fed to the above mentioned dragons

Dave_G_2

@hippy Using series resistors and clamping diodes does work for receiving RS232 levels and I have also used it countless times. However the problem comes in driving the RS232 TX line. I have come across a few PCs and laptops (yes some do have serial ports) that don't reliably see 3.3V or even 5V log...

Dave_G_2

I think there is a bit of confusion as regards the serial ports. The R-PI has a UART which along with it's GPIO lines give out 3.3v so the serial port is not RS232 levels i.e. +15V and -15V For this we need a MAX type chip which converts the RS232 levels to 3.3v logic and vice versa. The MAX232 is m...

Dave_G_2

@dwelch67

Just a thought, why not also put the compiled img on github so that beginners that don't quite yet
understand the whole process (or only use Windows) can also test and hopefully get interested.

Dave_G_2

@dwelch67 Well done for getting it going, all those SD card insertions and removals are not fun. Very similar to the old days using the 8051 where it was a case of take the chip out of the socket, insert in ZIF socket of programmer, program, take out, put back into target board, test, oops, mistake,...

Search found 196 matches

Re: Open/Closed or Somewhere-in-between source?

Re: Game Console OS

Re: Open/Closed or Somewhere-in-between source?

Re: Open/Closed or Somewhere-in-between source?

Re: Why not program on x86 desktop?

Re: Open/Closed or Somewhere-in-between source?

Re: Why not program on x86 desktop?

Re: RISC OS on Raspberry Pi

Re: RISC OS on Raspberry Pi

Re: Why not program on x86 desktop?

Re: RISC OS on Raspberry Pi

Re: how to make PI out of PI?

Open/Closed or Somewhere-in-between source?

Re: how to make PI out of PI?

Re: Game Console OS

Re: Who knows where the time goes?

Re: Who knows where the time goes?

Re: startx @ 480x360 -- possible?

Re: you are all fools

Re: you are all fools

Re: What exactly does the Unique Activation Code suggest?

Re: Programming the ARM chip

Re: Programming the ARM chip

Re: Programming the ARM chip

Re: Programming the ARM chip