AVR Freaks

AVR forum :: RE: PWM Servo code for ATMega168

Author: Lajon
Subject: RE: PWM Servo code for ATMega168
Posted: Oct 11, 2008 - 11:24 AM (GMT 1)
Topic Replies: 12

Quote:

Is it possible that setting those timers for settime() is conflicting with my servo code in init_pwm() ? they use the same timers...

Possible? More like certain. You can use another timer for the delay or use the util/delay.h delay loops.
/Lars

General Electronics :: RE: I2C problem: The ack from the slave is not low enough!!!

Author: xchip
Subject: RE: I2C problem: The ack from the slave is not low enough!!!
Posted: Oct 11, 2008 - 11:14 AM (GMT 1)
Topic Replies: 4

Hi!

I'am using bit banging, and for reading the Ack bit this is the code I'm using:

Code:

unsigned char I2C_ReadBit()

{

        // I am using external pullups 10k, but

        // turning on the IC's pull ups should 

        // not harm

        I2C_PORT |= ( 1 << I2C_SDA );

        I2C_PORT |= ( 1 << I2C_SCL ) ;

        _delay_ms(1);

        // I2C_DDR &= ~( 1 << I2C_SDA );

        unsigned char data = I2C_PIN;

        // I2C_DDR |= ( 1 << I2C_SDA );

        I2C_PORT &= ~( 1 << I2C_SCL );

        _delay_ms(1);

        // return SDA bit

        return ( data >> I2C_SDA ) & 1;

}

I feel I'm very close to get it working!!! modules/PNphpBB2/images/smiles/icon_smile.gif" alt="Smile" border="0" />

P.D: in case it matters I'm usign an Atmega128

AVR forum :: RE: My PonyProg doesnt work!

Author: david.prentice
Subject: RE: My PonyProg doesnt work!
Posted: Oct 11, 2008 - 11:11 AM (GMT 1)
Topic Replies: 1

The xtal will be no problem. However the virgin Tiny will be running on its internal 1MHz clock. See if reducing the programming speed helps.

Otherwise, you have discovered the joys of cheapskate parallel port programming. Read the tutorial from Plons.

You should be able to get your circuit to work. It just may not always be that reliable. On the other hand perhaps it will work very time.

Which PonyProg interface circuit have you made ?

David.

AVR forum :: RE: A few questions regarding electronics and Atmel...

Author: microcarl
Subject: Re: RE: A few questions regarding electronics and Atmel...
Posted: Oct 11, 2008 - 11:05 AM (GMT 1)
Topic Replies: 8

leon_heller wrote:

You don't need a 64 MHz crystal! Faster chips use a PLL to generate the clock, from a much lower frequency.

A PC supply can be awkward, as it might need quite a high load even to start - far more than a little AVR can provide. It's best to use batteries (NiMH) or get a proper bench supply. I like the little LASCAR one, it's quite cheap.

Leon

A conventional PC power supply is not recommended for the beginner, as it has complications that must be considered that will more then likely be beyond novice abilities. Though, a PC notebook power supply may work well, if the external project voltage regulators are well heat-sink-ed well enough.

A small, say 9VDC or 12VDC Wall-Wart capable of supplying about 100mA to a 5V0 and/or 3V0 voltage regulator(s) is more then enough to get you started.
_________________
Carl W. Livingston, KC5OTL
microcarl@roadrunner.com

It's a fundamental law of nature... All things gravitate toward total chaos!!!

The original Dragon Slayer !

Long live the AVR!!!

Off-topic forum :: RE: Microchip and ON Bid for Atmel

Author: kmr
Posted: Oct 11, 2008 - 10:58 AM (GMT 1)
Topic Replies: 132

metal wrote:

then why microchip wants to buy ATMEL ?

So they can learn how the name "AVR" really originated.
_________________
Kevin Rosenberg
http://b9.com
http://kevin.hypershots.com

AVR forum :: RE: Free beer and naked girls!

Author: kmr
Subject: RE: Free beer and naked girls!
Posted: Oct 11, 2008 - 10:56 AM (GMT 1)
Topic Replies: 5

From a recent thread comes the answer to all questions: "Use gcc!"
_________________
Kevin Rosenberg
http://b9.com
http://kevin.hypershots.com

General Electronics :: RE: battery Configuration

Author: djoshi
Posted: Oct 11, 2008 - 10:46 AM (GMT 1)
Topic Replies: 6

They will be

AVR Tutorials :: RE: [TUT][HARD][PCB] How to make your own board.

Author: condemned
Posted: Oct 11, 2008 - 10:44 AM (GMT 1)
Topic Replies: 26

The black labeling in the picture is just toner, ironed directly on to the glass-fibre board. There is no copper underneath the labels in this example.

Once you find the right iron temperature and the correct pressure to iron with, they're pretty difficult to remove. If I ever iron on the wrong labels (don't ask!), it takes a lot of sanding with wet-and-dry paper to get them off.

I used to sand the board before applying the labels, believing that it helped to provide a key for the toner, but I've recently found that it's just as good without.

The toner labels are easily marked by a soldering iron though, so I always tin my copper tracks before ironing on the labels.

On a technical note, I believe that there are different sorts of toner out there. I used to use an HP LaserJet for my transfers (courtesy of work), and that toner was much more dense (but easier to smudge whilst ironing) than my Samsung ML-2510's toner.

AVR studio 4 forum :: 3 wire USI functional with JTAGICE MKII in TN24?

Author: marc_j
Subject: 3 wire USI functional with JTAGICE MKII in TN24?
Posted: Oct 11, 2008 - 10:37 AM (GMT 1)
Topic Replies: 0

I'm trying to get SPI mode 1 to function using the assembly code in the data sheet and JTAGICE MKII with Studio 4.14.
The clock output works correctly (changes state in the PIN and PORT registers, and in the application) but MOSI (PA6) does not change state as the bits are shifted from USIDR. I have DDRA6 set as an output (as it should be) but the state on this bit remains whatever it was prior to the start of the USI TX.

I assume USI is fully functional since it isn't in the known issues for JTAGICE MKII.

Can somebody tell me whether the USI 3 wire mode is functional with JTAGICE MKII?

Thanks

AVR32 Hardware :: RE: EVK1100 PCB Gerber Files

Author: funnyLinux
Posted: Oct 11, 2008 - 10:30 AM (GMT 1)
Topic Replies: 6

Altium cannot import .art file. It accepts .g?? format.But it's very easy to do mesurement job. I use it for a long time. I need some SW to convert .art to .g??.

I'll have a look at pulsonicx.

Thank you for your help!

funnyLinux

AVR32 Linux Forum :: RE: New ways for GPIO

Author: ghayne
Posted: Oct 11, 2008 - 10:28 AM (GMT 1)
Topic Replies: 1

Wonderful squidgit, is this your baby? I have been waiting for this.

When can we expect a Buildroot version modules/PNphpBB2/images/smiles/icon_wink.gif" alt="Wink" border="0" />

Garry
_________________
Regards, Garry Hayne

AVR32 General (standalone) :: RE: SPI-Master PDCA-config for receive? (UC3B)

Author: Heihopp
Subject: Re: RE: SPI-Master PDCA-config for receive? (UC3B)
Posted: Oct 11, 2008 - 10:20 AM (GMT 1)
Topic Replies: 10

DerAlbi wrote:

How does the Channel-priority affect the function of the channel?

Is it possible that a lower priority-channel can loose some received bytes? (e.g)
That would be a great help..

I don't know what exactly happens. As i understand it, the SPI can work something like this when using PDCA:

1. Enable RX
2. Enable TX (believe the opposite order is wrong)
3. SPI_TXRDY flag is set (ready to transmit a char)
4. PDCA TX grabs a char from TX memory table
5. SPI TX gets the char, resets TXRDY flag and shifts out
6. SPI RX gets a char and sets the SPI_RXRDY flag
7. PDCA RX grabs the char from SPI and stores to ram
8. goto 3

The time between RXRDY and TXRDY flag is essential. I am not sure if this time is positive or negative, and if the module hardware waits for RX process to finish before setting the TXRDY flag. Information about this probably can be found in the PDCA or SPI documentation in the datasheet.

Maybe one can program a delay so that TXRDY flag will be set after that delay, thus giving room for the RX process. See page 210 about TXEMPTY flag. Question is if PDCA uses this flag or TDRE as what i called TXRDY in this post.

AVR32 General (standalone) :: USB gamepad. How to start ?

Author: bubugian
Subject: USB gamepad. How to start ?
Posted: Oct 11, 2008 - 10:15 AM (GMT 1)
Topic Replies: 0

Let's suppose you'd like to start a new project: PS3 USB GAMEPAD.

Suppose to use Atmel's USB framework.. wich usb class ?
How I could tell to PS3 that (for example) square button is pressed or left analog is up ?

Please let me know how to start...
Thanks very much!

Regards, bubugian.

AVR GCC forum :: RE: AVR, Netbeans, eclipse

Author: bubugian
Subject: RE: AVR, Netbeans, eclipse
Posted: Oct 11, 2008 - 10:07 AM (GMT 1)
Topic Replies: 1

SOLVED: very, very easy.
Set compiler and debugger tool inside the netbeans option.
All works very well. I suggest it.

Regards,
bubugian.

General Electronics :: RE: Eagle PCB to something else

Author: markus_b
Subject: RE: Re: RE: Eagle PCB to something else
Posted: Oct 11, 2008 - 10:07 AM (GMT 1)
Topic Replies: 4

One other place which takes Eagle files is Olimex.

Markus
_________________
Markus - Always listen to experts. They'll tell you what can't be done, and why. Then do it. - Lazarus Long