AVR Freaks

AVR forum :: RE: which new type of the Microcontrollers to learn?

Author: dbrion0606
Subject: RE: Re: RE: Re: RE: Re: RE: Re: RE: Re: RE: Re: RE: Re: RE:
Posted: May 25, 2013 - 04:14 PM (GMT 1)
Topic Replies: 145

I had a look at opencv, under cygwin (some GNUlinux functionalities added to Windows 98,XP or Seven): I had no issues having the library buildt and installed, and testing Clawson's example to convert png color images into grey PNG images(compiling the whole library took about 1 hour on a modern PC; native GNUlinux Fedora, on a less modern PC, took 30 mns).
As for rapsberry: opencv can be found, already compiled (no need spending times compiling it) , on raspbian : a demo recognising people can be found here http://www.raspberrypi.org/archives/tag/opencv, and, following the links, one can find http://thinkrpi.wordpress.com/2013/05/2 ... board-csi/ the way to install every ingredient (including upgrading some portions of the library) ....

AVR forum :: RE: Problems with TWI slave transmitter/master receiver

Author: david.prentice
Subject: RE: Problems with TWI slave transmitter/master receiver
Posted: May 25, 2013 - 04:09 PM (GMT 1)
Topic Replies: 1

If you deliberately write void functions, you will always be groping in the dark.

Re-write them with proper error returns and you will see where things go wrong.

Since you are using mega328, you could use the Arduino <Wire.h> library.

David.

AVR forum :: RE: USBtiny and other VUSB on attiny -compiled hex file to big..

Author: david.prentice
Subject: RE: USBtiny and other VUSB on attiny -compiled hex file to b
Posted: May 25, 2013 - 04:01 PM (GMT 1)
Topic Replies: 6

I will wait for a reply from the OP.

If she actually wants to change things, then it is obviously wise to use the most modern compiler.

However, I doubt that it would fit. I might even give it a go myself.

Ah-ha. Rowley is using GCC 4.7.3 for its ARM compiler. I am currently wondering why a Stellaris M3 should use less cycles than an NXP M3. They are both significantly better than a Freescale M0+.
Surely one Core should get the same code generated regardless of maker. It is the peripherals that make the difference on these Cortex-M chips. (and Freescale have got horrible peripherals ! )
Oh, CMSIS-DAP works nicely with NXP but a bit flaky with Freescale.

I have not used Studio 6.1. The 6.1 Beta did not work with either my Dragon or JTAGICE-mkII. Is 6.1 safe to use yet ?

David.

AVR forum :: RE: Does anyone know on how to initialize ADC on ATMEGA128 ?

Author: dbrion0606
Subject: RE: Re: RE: Re: RE: Re: RE: Re: RE: Re: RE: Does anyone know
Posted: May 25, 2013 - 03:59 PM (GMT 1)
Topic Replies: 38

Code:

uint8_t read_adc(void)

Well, it would be wise to be able to select a channel, given as an argument (and js already explained how)

Code:

uint8_t read_adc(uint8_t channel)

There is something I do not understand : atmel gives (6| 8 ) converters (in fact, muxed channels) with 10 bits resolution. Why should one
a) cut the number of channels
b) cut the number of bits
???

General Electronics :: RE: Low Cost COG LCD display...

Author: alank2
Subject: RE: Low Cost COG LCD display...
Posted: May 25, 2013 - 03:52 PM (GMT 1)
Topic Replies: 3

Hi jayjay1974,

Actually it is semi transparent. You can see through it, but with adequate light from the front you can't.

Thanks,

Alan

Off-topic forum :: RE: CHEAP Android tablet suggestions

Author: svofski
Subject: RE: CHEAP Android tablet suggestions
Posted: May 25, 2013 - 03:50 PM (GMT 1)
Topic Replies: 10

Kindle Fire HD is a cheap Android tablet.
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General Electronics :: RE: motorcycle traction control project - concept - need help

Author: dragilla
Posted: May 25, 2013 - 03:14 PM (GMT 1)
Topic Replies: 184

Hi, after a long break modules/PNphpBB2/images/smiles/icon_smile.gif" alt="Smile" border="0" />
I've assembled my device and after some small fixes and corrections I was ready to put it on my bike. I even did some testing with coils and spark plugs on my desk. All worked as designed modules/PNphpBB2/images/smiles/icon_smile.gif" alt="Smile" border="0" />
Now to the point. I decided to mount this thing on my Supermoto bike first, since it has only 1 cylinder and all should be easier, right? Wrong modules/PNphpBB2/images/smiles/icon_sad.gif" alt="Sad" border="0" />
The bike has no battery since this is Supermoto build from a cross (Yamaha YZ450F) bike.
The battery is no problem, I thought. I can use an external battery for the first tests and then maybe try to use the same power source as the CDI unit. My device takes little current - it should be fine. Anyways with an external battery I'm sure it will work...
Imagine how surprised I was when I connected my device and it didn't work :/
I scoped the lines going into the coil (gnd connected to the bike's frame) and guess what: the signal is reversed (compared to other two bikes I've tested - Yamaha R1, and some Italian street single, both with batteries). The signal was like: 1 line constant 0V, the other line most of the time 0V and 12V for the dwell time. In other bikes it was like this: 1 line constant 12V, the other was grounded for the dwell time. I thought it's a standard of some sort and that all motorcycles with electronic ignition modules work like this.
I'm totally lost now. Have you heard about such ignition model? Or maybe I've just connected something the opposite way (looks like measuring against 12V instead of GND).
I'm writing here (this forum) because so far people here have been the most helpful people I've found on the internet modules/PNphpBB2/images/smiles/icon_smile.gif" alt="Smile" border="0" /> Maybe you can save me once more?

AVR Wireless forum :: RE: Phase Difference Measurement (AVR2151: RTB)

Author: bigjosh2
Subject: Quick first look at ranging with the AT86RF233
Posted: May 25, 2013 - 01:58 PM (GMT 1)
Topic Replies: 7

I also was able to get 80m range outdoors, but to get best results I had to bump up the transmission power and pay attention to antenna orientation.

Very quick write-up here...

http://wp.josh.com/2013/05/23/first-look-at-distance-measurement-using-the-at86rf233-chip/

I hope to play with this more over the weekend and report back.

-josh

AVR studio 4 forum :: RE: Old and Dusty chips

Author: sparrow2
Subject: RE: Re: RE: Re: RE: Re: RE: Old and Dusty chips
Posted: May 25, 2013 - 01:40 PM (GMT 1)
Topic Replies: 15

My Studio 4 is a 4.19 Build 528 (at least on this computer modules/PNphpBB2/images/smiles/icon_smile.gif" alt="Smile" border="0" /> ) and there I can select a at90s2313.
It's nice to know that I need to keep it! (I think I have 20 of the old 2313 modules/PNphpBB2/images/smiles/icon_smile.gif" alt="Smile" border="0" /> )

AVR forum :: Unit testing for avr?

Author: Gediminas_M
Subject: Unit testing for avr?
Posted: May 25, 2013 - 12:48 PM (GMT 1)
Topic Replies: 0

Hello,

I was wondering, if anyone have tried to use unit testing in your avr projects? Can you share some example or tutorial of how you managed to configure your testing framework with avr dependencies?

Currently I'm trying to figure it out how to run CUnit with my current Atmega16 project and this is not going well modules/PNphpBB2/images/smiles/icon_smile.gif" alt="Smile" border="0" />

I'm not very keen in those makefile, compiler and other stuff configuration magic, so any help appreciated modules/PNphpBB2/images/smiles/icon_smile.gif" alt="Smile" border="0" />

AVR forum :: RE: Small rtos for atmega162 written in C

Author: clawson
Subject: RE: check out my project using Salvo Tiny
Posted: May 25, 2013 - 12:26 PM (GMT 1)
Topic Replies: 8

But what is your goal? Is it just to learn about RTOS concepts. In that case I'd use a "full" implementation and live with the fact that for the purposes of experimentation and learning you can maybe only get two or three tasks running side by side.

Or do you intend to use this for an actual application in the 162? If so I stand by the assertion that an RTOS is the wrong solution for such a small, simple chip.
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AVR32 Software Tools :: RE: Timer Counter being weird

Author: Redplaya
Subject: RE: Timer Counter being weird
Posted: May 25, 2013 - 12:15 PM (GMT 1)
Topic Replies: 2

Hey Musalk, yea the problem was I forgot to read the TC status register. Thanks!

AVR Studio 5 and Atmel Studio 6 forum :: RE: Newbie question on timers/ISR

Author: clawson
Subject: RE: Newbie question on timers/ISR
Posted: May 25, 2013 - 12:05 PM (GMT 1)
Topic Replies: 3

Quote:

So you if you can't watch the status of the pins, how can you verify that the timer interrupt is working and the pin is going high and low?

Like I say you run to a breakpoint then you look to see if the pins (shown as PORTx in the IO view) have chnanged into the state you expected. It is, of course, easier to simply put the code into an AVR and see what happens but using real hardware rather than trying to simulate it seems to be going out of fashion these days.

Quote:

I thought I looked in the I/O view but did not see any TCNT0 registers.

Which AVR was this - most do have a TCNT0 so I'm pretty sure I can assure you that it wa there!

Quote:

it doesn't look like there is really much there that would need to be set for testing purposes.

That depends on the AVR.
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AVR GCC forum :: RE: Looking for C++ template optimizations

Author: SprinterSB
Subject: RE: Looking for C++ template optimizations
Posted: May 25, 2013 - 11:33 AM (GMT 1)
Topic Replies: 1

For such questions on GCC guts you can try the avr-help@gcc.gnu.org mailing lists.
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AVR GCC forum :: RE: Possible to reference a register in gcc?

Author: SprinterSB
Subject: RE: Re: RE: Re: Looks like it works
Posted: May 25, 2013 - 10:50 AM (GMT 1)
Topic Replies: 15

That's because C++ compiler must encode the function's args into its name.

Presumably, __c is in static storage and not global, i.e. static local or static and local to the C module; thus the .<some_number>.
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