AVR Freaks

AVRfreaks Trading Post :: Arduino Simulator

Author: Shields
Subject: Arduino Simulator
Posted: Feb 04, 2012 - 01:56 AM (GMT 1)
Topic Replies: 0

We are in the process of developing this Simulator for Arduino program here. There is a free version download which has a delay timer on opening a sketch and is code limited to 100 lines.

At present, Simulator for Arduino is the most full-featured and functional Arduino Simulator available. There are several others which are listed at the end if the webpage but they are either non functional, buggy or require compilation. All feedback is appreciated.

AVR GCC forum :: RE: LPZ Rxx, Z+ with pgmspace.h ?

Author: SprinterSB
Subject: RE: LPZ Rxx, Z+ with pgmspace.h ?
Posted: Feb 04, 2012 - 01:50 AM (GMT 1)
Topic Replies: 2

Look at pgmspace.h. It all maps to inline assembly, so you will never get Z+ with pgm_read_byte from post-incrementint the address in C.

One solution is writing code completely in assembler (fastest code, I use that for sin/cos lookup) or to use pgm_read_dword (read one byte too much and you have to extract the bytes) or write own pgm_read_byte_inc inline assembler macro (I use that, too).

AVR forum :: RE: Simulator for Arduino

Author: Shields
Subject: RE: Re: RE: Simulator for Arduino
Posted: Feb 04, 2012 - 01:49 AM (GMT 1)
Topic Replies: 8

Thanks for the replies. OK so everyone knows about Arduino. One of the reasons to put the post up here was to maybe get a few people to test the program and find some more issues, so we can then make it better. Originally, we were going to look into making Shields but there hasn't been much interest except for the reply on Yotube from the guy who makes home-made detonators wanting the Arduino sketch for the RF control chip.

John, if you want to leave this topic up, I will start another topic in the Trading Post section. Nice pic by the way. Also, nice to know there are a lot of Aussies here. We seem to have all our customers in Melbourne and Qld. The few customers left in Sydney are not great payers so probably don't qualify as customers anyway.

Off-topic forum :: RE: Gotta love the fence sitters ...

Author: smileymicros
Subject: RE: Re: RE: Re: RE: Gotta love the fence sitters ...
Posted: Feb 04, 2012 - 01:43 AM (GMT 1)
Topic Replies: 17

I thought years ago that if the CIA didn't own most of the anomymizer sites they were even stupider than we often think they are. I'd mention the PGP Encryption backdoor but I'm afraid I'd get (I&(&$#&(*^(&
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AVR Studio 5 forum :: RE: AVR ONE! JTAG pin numbers

Author: js
Subject: RE: AVR ONE! JTAG pin numbers
Posted: Feb 04, 2012 - 01:40 AM (GMT 1)
Topic Replies: 6

I don't have a "recommended development environment" I can only tell you what I use. modules/PNphpBB2/images/smiles/icon_smile.gif" alt="Smile" border="0" />

I have 1.5 Dragons (the .5 only works in DW mode), a JTAG Mk1 (home made), a JTAG Mk2, an ICE200 for a few OLDER chips, AVRISP Mk1 (older RS232 type), an AVR910 type programmer (old), a STK500 and 3 "fellow freak brand" keyfob like programmers which are used for the production\test bench.

Still using Studio 4.18 which works with all the above. Don't need the changeover pain to AS5 (and lose some of my, no longer supported in AS5, tools).
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AVR forum :: RE: umm... malloc fail :(

Author: luvocean1
Subject: RE: Re: RE: umm... malloc fail :(
Posted: Feb 04, 2012 - 01:37 AM (GMT 1)
Topic Replies: 14

hhhm..thanks for that.
So I should try to define data structures as global variables where possible...

AVR forum :: RE: ATmega644p AVRDUDE Invalid Device Signature

Author: Plons
Posted: Feb 04, 2012 - 01:06 AM (GMT 1)
Topic Replies: 13

Quote:

I am absolutely positive everything is wired correctly.

Nevertheless, it doesn't work. Can you ask someone else to check the wiring ? Re-checking yourself may result in overlooking the same fault. You'd not be the first one.

Quote:

Is it possible (or at this point, probable) that I got a bad chip?

Impossible for me to answer that question.

Quote:

How have you determined what pin1 of that 10p connector is ?

If you don't answer my questions, how on earth can I help you ?

Bedtime at this side of the pond.

PS Did you measure the supply voltage for the 644 ? With a voltmeter ?
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General Electronics :: RE: Really Big Display?

Author: hugoboss
Subject: RE: Re: RE: Re: RE: Re: RE: Really Big Display?
Posted: Feb 04, 2012 - 12:54 AM (GMT 1)
Topic Replies: 27

A vertically mounted cylinder on a stick like the "praying mill" pictured above is actually a pretty nice idea! It takes very little power to rotate each shaft through a PWM'd motor whenever a number changes, and it can be very durable and lightweight and cheap to build with a polycarbonate sheet, a printed decal, and some lamp cover-like structure. You can encase the whole thing in a box, or just the electronics. Each digit can occupy a ~30 degrees arc of the cylinder surface, and it can be as high as you want (with wind in consideration).

General Electronics :: RE: 6/12mhz quickie

Author: hugoboss
Subject: RE: Re: RE: 6/12mhz quickie
Posted: Feb 04, 2012 - 12:43 AM (GMT 1)
Topic Replies: 36

So this delays a copy of the original signal by 90 degrees and feeds both outputs to a XOR gate. Clever. This is actually pretty useful for a micro-based PLL. Use an AVR with two or 4 PWM's ran at 1/4 timer clock, and the timer's prescalers, and you can output a pretty wide range of lower or higher frequencies...

XMEGA forum :: RE: Xmega 128a3 hd44780 library in 4 bit mode

Author: andariel
Posted: Feb 04, 2012 - 12:36 AM (GMT 1)
Topic Replies: 11

Thanks for help I will try It on monday. I´m going to travel to my school (in different country).

AVR forum :: RE: Watchdog timer reset ATMega2560

Author: pcoiner
Subject: RE: Watchdog timer reset ATMega2560
Posted: Feb 04, 2012 - 12:33 AM (GMT 1)
Topic Replies: 6

I tested with otpimization set to -O1 and everything works fine.

AVR forum :: RE: SPI SS pin in Master mode?

Author: indianajones11
Subject: Re: SPI SS pin in Master mode?
Posted: Feb 04, 2012 - 12:33 AM (GMT 1)
Topic Replies: 2

mnehpets wrote:

Quote:

I have only 1 master (atmega88) & 1 slave(adt7310 temperature sensor).so I connected my cs pin of the slave to GND. That means the adt7310 is always selected as slave.

That's not a good idea. Most SPI slaves (and the adt7310 is included in the category "most SPI slaves") use the CS input to signal the start and end of SPI transactions.

- S

Therefore, use a pin ( might as well be the SPI /SS ) for /CS and drive it from the master and if it works, you'll know what the problem was .
_________________
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2) WinAvr 20100110
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A) Avr Dragon ver. 1
B) Avr MKII ISP, 2009 model
C) MKII JTAGICE ver. 1

AVR forum :: RE: Driving 16x2 LCD display - not working

Author: LDEVRIES
Subject: RE: Re: RE: Driving 16x2 LCD display - not working
Posted: Feb 04, 2012 - 12:24 AM (GMT 1)
Topic Replies: 15

Yes.... that is a "Murphy" waiting to catch people out! modules/PNphpBB2/images/smiles/icon_sad.gif" alt="Sad" border="0" />
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AVR GCC forum :: RE: creating a delay

Author: haker_fox
Subject: Re: creating a delay
Posted: Feb 03, 2012 - 11:48 PM (GMT 1)
Topic Replies: 2

sekantsi wrote:

can sombody send me a sample code on how to create any delay

Hello! As it mentioned earlier you can use AVR Libc (from WinAVR). But you should realize that those functions might be no so good precise for you. And yet: they stall MCU for a while. So you can't do anything with the exceptions of interrupts.

AVR forum :: RE: SPI multiple devices switching (pressure logger)

Author: bobgardner
Posted: Feb 03, 2012 - 11:45 PM (GMT 1)
Topic Replies: 7

If the slave spi device doesn't make its output line back to the master hi-z when you deassert the cs, that miso line will be wire-or-ed with the other one. Clue is they work with one or the other in the circuit, mess up with both. One fix is run the data back from the sensors thru an ls125 or ls126 and select with the cs. Hope this helps.
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