AVR Freaks

Off-topic forum :: RE: Confess! Who's freak workbench is this?

Author: Geoff
Subject: RE: Confess! Who
Posted: Mar 11, 2010 - 12:09 AM (GMT 1)
Topic Replies: 3

http://thereifixedit.com/2010/03/10/epi ... al-wipers/

wow. just, wow.

AVR32 General (standalone) :: atxmega128a1 interfacing with jtagice mkii issues.

Author: Quixote
Subject: atxmega128a1 interfacing with jtagice mkii issues.
Posted: Mar 10, 2010 - 11:44 PM (GMT 1)
Topic Replies: 0

I am currently using an atxmega128a1 to communicate USART with a mcp2122 ir encoder/decoder. My issue is that while the jtagice mkii is plugged into my atxmega the atxmega outputs USART and PWM signals properly to the mcp2122, but the moment I remove the jtagice mkii the PWM, USART output, and USART input begins to reveal a pulsing tendency whereby the PWM/USART will run for a set period and not run for a set period (in repetition). I believe this a reset issue with the atxmega128a1. Currently I am pulling up the reset pin on the atxmega128a1. I am under the impression that this should be sufficient in order to ensure that the atxmega128a1 does not reset periodically, but it is quite possible that I am incorrect.

My code is attached if you wish to analyze it.

AVR forum :: RE: avr butterfly LCD driver asm+ show character

Author: zbaird
Posted: Mar 10, 2010 - 11:28 PM (GMT 1)
Topic Replies: 7

The initialization has to be done to prep the LCD for use. No way around that one.

The calibration just tweaks the internal oscillator so it's running as close to specs as it can. You don't really care about this for many applications, and unless you're doing some critical timing and/or higher speed communications this probably won't be necessary. And, as Cliff says, if you use the Atmel bootloader, it does the calibration prior to running your program (because it uses serial communications). One of my tutorials tells exactly what the bootloader does.

For quick and dirty apps I never calibrate, and I've never had any problems on serial communication. Perhaps my bevy of Butterflies have calibration bytes that are particularly close to being correct. Better safe than sorry, of course, or be willing to consider bad clock rates as the source of problems. Lots of folks here like to post dire warnings on using the internal oscillator for apps with serial communications.

If your prof/lab teacher/whatever has said you need to calibrate, I believe there's an app note, plus there's the source code for the Butterfly, plus its port to GCC, plus other calibration examples available. As Cliff says, show the C source to a compiler and let it spit out the assembler version. Cleaning up compiler output is an interesting exercise in and of itself. But my guess is that even with a working calibration routine your situation won't change.

<edit> Whoops! - brain fart. The Butterfly source (and port) does not include the calibration - it's part of the bootloader, and that source is not included. Sorry.
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Chuck Baird
What would Scooby do?
http://www.zbaird.com

AVR forum :: ks108glcd and a atmega16

Author: XM128A1
Subject: ks108glcd and a atmega16
Posted: Mar 10, 2010 - 11:27 PM (GMT 1)
Topic Replies: 0

hi
i have some problems with a ks108glcd and a atmega16 programmed in bascom avr.
this is my first glcd project and first i used a atmega32 but it died (i think it whas esd) so i changed to a atmega16,

her is my code

Code:

$regfile = "m16def.DAT"

$crystal = 8000000

$baud = 9600

$hwstack = 32

$swstack = 8

$framesize = 24

$lib "glcdKS108.lbx"                                        'Include the library for the KS-108 controler

Config Graphlcd = 128 * 64sed , Dataport = Portb , Controlport = Portd , Ce = 3 , Ce2 = 4 , Cd = 0 , Rd = 1 , Reset = 5 , Enable = 2

'The dataport is the portname that is connected to the data lines of the LCD

'The controlport is the portname which pins are used to control the lcd

'CE =CS1 Chip select

'CE2=CS2 Chip select second chip

'CD=Data/instruction

'RD=Read

'RESET = reset

'ENABLE= Chip Enable

Dim X As Byte , Y As Byte

'Clear the screen will both clear text and graph display

Cls

'Other options are :

' CLS TEXT   to clear only the text display

' CLS GRAPH  to clear only the graphical part

Cursor Off

Wait 1

'locate works like the normal LCD locate statement

' LOCATE LINE,COLUMN LINE can be 1-8 and column 0-30

Locate 1 , 1

'Show some text

Lcd "hello world"

'And some othe text on line 2

Locate 2 , 1 : Lcd "lcd modul version 3,0"

Locate 3 , 1 : Lcd "made 10/03/10"

Locate 16 , 1 : Lcd "driven by a atmega32"

End

then i gets this error messege

Code:

error:61  line:66   label not found [_lcd_control   ] ,in file:c:\program\mcs electronics\bascom avr\glcd.bas

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AVR FREAK
BASCOM FREAK
SIMPSONS FREAK

AVR forum :: RE: V-USB Software USB Fails on 30% of ATTiny45

Author: vsovereign
Posted: Mar 10, 2010 - 11:20 PM (GMT 1)
Topic Replies: 35

Hi, I'm interested in this topic since I'm using ATtiny45 and V-USB.
One of the sample projects, EasyLogger, is using ATtiny45 and V-USB. It works just fine.
But when I tried using another example, this time HID to connect to the device, it fails.
Enumeration works. Device is recognized and name properly displayed. But then after several seconds it says that there is a problem and that device will not function properly.
Any ideas?

General Electronics :: Lost Topic

Author: ignoramus
Subject: Lost Topic
Posted: Mar 10, 2010 - 11:17 PM (GMT 1)
Topic Replies: 0

I was in the process of posting a response ( see below) to a question on a light curtain when the server suffered a glitch.
I do not see the topic in the list any more.

In any case the response to the post follows:

"Google for Erwin Sick that will give you an idea of whatprofessional safety light curains and remote reflective and transmissive componentslook like and do.

You might wih to consider the following:

use reflective method abd use a cube corner reflector ( like the passive reflectors on oldfashined pushbikes)

use a square wave to drive the LED/LASERDIODE in order to eliminate effects of environmental optical interference and noise
use synchronous demodulation/detection driven by the same signal whihc is energizing your light source.( synchronous detection is a cheap and effective way of selecting only the signal you want to extract google "lock in amplifier " for insight)"

AVR GCC forum :: RE: Preprocessor macro substitutions/calculations

Author: skeeve
Subject: Re: RE: Preprocessor macro substitutions/calculations
Posted: Mar 10, 2010 - 11:15 PM (GMT 1)
Topic Replies: 4

david.prentice wrote:

However when the pre-processor finds a #if (expression), it will evaluate this (possibly with 64 bit accuracy) e.g. #if ( 2.1 + 2 == 4.1)

Note that there is no guarantee that that expression would be true.
I expect that it usually would, but not necessarily always.
_________________
Michael Hennebry
Iluvatar is the better part of Valar.

General Electronics :: RE: What kind of dimmer is this one ?

Author: ignoramus
Subject: RE: What kind of dimmer is this one ?
Posted: Mar 10, 2010 - 10:57 PM (GMT 1)
Topic Replies: 4

It looks like typical solid state relay mosfet configuration for AC switching.
The fets are not a part of the optical path so the circuit needs additional ISOLATED +Vcc suppl to effect gate drive.
While it does function it might be cheaper to go with the technology intended for this kind of work.. a triac and an opto triac trigger

AVR forum :: RE: overflow with big arrays?

Author: clawson
Subject: RE: overflow with big arrays?
Posted: Mar 10, 2010 - 10:56 PM (GMT 1)
Topic Replies: 11

Well the worry in that is the 3798 bytes in .bss - that's a big chunk out of your 4096. In fact .data is 244 so 244+3798 = 4042 so that's close to all of SRAM even before you consider stack space for CALL/RET and automatics (rule of thumb - leave 25% for those)

But your numbers don't add up. If your unpopulated arrays were only as given in the first post it's already been calculated that it'd only occupy 706 bytes so you have a whole load more arrays you aren't telling us about or the dimensions of the ones you have are not as you said in the first post.

Cliff
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AVR forum :: RE: ADC conversion on ATTiny25 dependence from Vcc?

Author: mitko_drifta
Subject: RE: ADC conversion on ATTiny25 dependence from Vcc?
Posted: Mar 10, 2010 - 10:54 PM (GMT 1)
Topic Replies: 5

I just read in the manual, that the ADC needs between 50 and 200 KHz. I run my AVR at 8 MHz and the ADC prescaler is set at 2, which results in 4 MHz. So maybe the problem is that it runs too fast. Gonna try it out on Friday and then report. Thanks for the help!modules/PNphpBB2/images/smiles/icon_smile.gif" alt="Smile" border="0" />

AVR studio 4 forum :: RE: Controlling 2 GLCDs with one ATMega

Author: clawson
Subject: RE: Controlling 2 GLCDs with one ATMega
Posted: Mar 10, 2010 - 10:51 PM (GMT 1)
Topic Replies: 1

I've not looked at the code but does the actual hardware interaction with the KS0108 not boil down to just one or two routines? If so you can just put a "gate" on those and have a global switch set to 1 or 2 then if (controller==1) do IO to one controller else the other.

Of course if they have littered the low level stuff all over the place this would be trickier but on the whole most drivers will be written to have just one low level h/w access routine.

EDIT: Your in luck it looks like they isolated it all within ks0108WriteCommand1() and ks0108WriteData1(). So just make a last minute decision in those routines which controller you are talking to.

Actually this is complicated a bit because these routines are already effectively doing:

Code:

   if(chip == CHIP1) {

   } else if(chip == CHIP2) {

because a single module already has two different controller chips on it - so maybe just split this 4 ways now? (chip1/2 on module1 and chip3/4 on module 2)
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General Electronics :: RE: AC Switching Question

Author: ignoramus
Posted: Mar 10, 2010 - 10:51 PM (GMT 1)
Topic Replies: 4

It would be cheaper to use something intended for the jobsince the opto trnasistor as shown may not withstand reversal of polarity so that You would need to econce it within a fourdiode bridge.

Check out http://www.futurlec.com/LED/MOC3021.shtml as the right opto device to trigger larger Triacs. Of itself MOC3021 is good for 100mA.

AVR forum :: RE: Initializing STA013

Author: Jepael
Posted: Mar 10, 2010 - 10:39 PM (GMT 1)
Topic Replies: 4

It can't be 0x83. That would mean read address, when write address is 0x82.

Datasheet says write address is 0x86 and read address is 0x87 (the 7-bit address without read-write bit (marked x) being 1000 011x).

At least you should tell us how you got it working.

AVR forum :: RE: how to use HyperTerminal with USB port (merged)

Author: husdat
Subject: RE: how to use HyperTerminal with USB port
Posted: Mar 10, 2010 - 10:34 PM (GMT 1)
Topic Replies: 5

sorry,
my school network got lagged, and prompted me to click Submit twice.

{yep, that happens now and then. Two threads merged, some cleanup ... Plons(mod) }

General Electronics :: RE: Single Wire Unidirectional Serial Protocol for Long Distance

Author: ka7ehk
Posted: Mar 10, 2010 - 10:15 PM (GMT 1)
Topic Replies: 13

And Lee's definitions are still valid.

Jim
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Jim Wagner
Oregon Research Electronics, Consulting Div.
Tangent, OR, USA