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2012-03-29 by Steve Hodge
+1, Steve From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of wagnerj@proaxis.com Sent: Thursday, March 29, 2012 9:24 AM To: AVR-Chat@yahoogroups.com Subject: Re: [AVR-Chat] Re: Mixing C and assembly with special requirements. Very informative thread! Mu
2012-03-29 by wagnerj@proaxis.com
> --- In AVR-Chat@yahoogroups.com, "Tim Mitchell" wrote: >> And remember to save SREG in interrupt routines. > Unless, of course, it isn't modified. Although usually not the case, it > is possible to construct an ISR that does not modify SREG. Take, for > example, this one that t
2012-03-29 by Tim Mitchell
----Original Message---- From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Don Kinzer Sent: 29 March 2012 16:05 To: AVR-Chat@yahoogroups.com Subject: [AVR-Chat] Re: Mixing C and assembly with special requirements. > --- In AVR-Chat@yahoogroups.com, "Ti
2012-03-29 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, "Tim Mitchell" wrote: > And remember to save SREG in interrupt routines. Unless, of course, it isn't modified. Although usually not the case, it is possible to construct an ISR that does not modify SREG. Take, for example, this one that toggles an
2012-03-29 by Steve Hodge
Thanks for the help, tips and pitfalls to watch for. I've looked at the links and I think I have it more or less figured out. Steve From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Tim Mitchell Sent: Thursday, March 29, 2012 1:29 AM To: AVR-Chat@yahoo
2012-03-29 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, "Tim Mitchell" wrote: >[Y]ou have to know exactly how the compiler has >stored the structs in RAM. On a host like the AVR where there is no penalty for accessing a byte-aligned data item one generally uses the compiler option -fpack-struct to ensu
2012-03-29 by Tim Mitchell
----Original Message---- From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Don Kinzer Sent: 28 March 2012 19:17 To: AVR-Chat@yahoogroups.com Subject: [AVR-Chat] Re: Mixing C and assembly with special requirements. > --- In AVR-Chat@yahoogroups.com, "St
2012-03-28 by Steve Hodge
Thanks a lot for the info, Don. I'll check it out later today (side-tracked on something else right now). Steve From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Don Kinzer Sent: Wednesday, March 28, 2012 11:33 AM To: AVR-Chat@yahoogroups.com Subject:
2012-03-28 by Steve Hodge
Tim, this was also very helpful to me also. Thanks. Besides plain variables, what do you do to pass C arrays and C structs? Steve From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Tim Mitchell Sent: Tuesday, March 27, 2012 1:51 AM To: AVR-Chat@yahoogro
2012-03-28 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, "Don Kinzer" wrote: > I've posted a simple example available at the link below. After reviewing the example, it will probably be obvious that the structure offset/size definitions for the assembly language code represent a double maintenance issue
2012-03-28 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, "Steve Hodge" wrote: > what do you do to pass C arrays and C structs? The assembly knows nothing about C structures or even simple C types. Consequently, you have to write the code manually to index arrays and access structure elements. I've poste
2012-03-28 by fireweaver
On 3/27/2012 8:30 PM, Don Kinzer wrote: > --- In AVR-Chat@yahoogroups.com, fireweaver wrote: >> This is the version that I am using in my DRO. > It would be a lot more convenient for those trying to help you if you would put the file on DropBox or some other server so that it can
2012-03-28 by fireweaver
On 3/27/2012 11:43 AM, Don Kinzer wrote: > --- In AVR-Chat@yahoogroups.com, fireweaver wrote: >> So I should write: >> subi ZL,0xFF-low(X_actions) >> lpm ZL,Z ; > ijmp > Yes, if you want to load the value from the table entry into ZL. Also, I suspect that the instruction precedin
2012-03-28 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, fireweaver wrote: >This is the version that I am using in my DRO. It would be a lot more convenient for those trying to help you if you would put the file on DropBox or some other server so that it can be accesses with the formatting preserved. Do
2012-03-27 by wagnerj@proaxis.com
> Hi group: > The problem I initially had on using the A/D on the ATmega128 was that I > am holding an A/D input at steady state and am changing all other 7 > channels in small increments until they reached the max level then they > would start from ground again. The problem I in
2012-03-27 by Draper
Thanks for the quick response. Unfortunately this board cannot be redesigned except for the current limiting resistor. Future boards will follow the guidelines you suggested. AVcc and Vcc are both at 5V. 6.25V is feeding the regulator. All channels of the A/D are setup for inputs
2012-03-27 by Draper
Hi group: The problem I initially had on using the A/D on the ATmega128 was that I am holding an A/D input at steady state and am changing all other 7 channels in small increments until they reached the max level then they would start from ground again. The problem I initially ha
2012-03-27 by fireweaver
On 3/27/2012 9:27 AM, Don Kinzer wrote: > > > --- In AVR-Chat@yahoogroups.com, fireweaver wrote: >> I don't know how this will appear since the >> group forbids attachments. > It got quite mangled, of course. If you don't have a server where you can store files you can use a serv
2012-03-27 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, fireweaver wrote: > So I should write: > subi ZL,0xFF-low(X_actions) > lpm ZL,Z ; ijmp Yes, if you want to load the value from the table entry into ZL. Also, I suspect that the instruction preceding the lpm should actually be subi ZL,0-low(X_actio
2012-03-27 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, fireweaver wrote: > I don't know how this will appear since the > group forbids attachments. It got quite mangled, of course. If you don't have a server where you can store files you can use a service like DropBox. An account with a 2GB limit is f
2012-03-27 by Tim Mitchell
I'm a bit of an assembly nut and have had good results mixing asm and c. (But not reserving registers, that just ties the compiler in knots) I create an asm.s file in the project and define any variables I need in one of the c files. Then using .extern in the asm file you can use
2012-03-27 by fireweaver
On 3/26/2012 3:46 PM, Don Kinzer wrote: > --- In AVR-Chat@yahoogroups.com, fireweaver wrote: >> The decoder I have does its thing in about 28 cycles. As a C >> interrupt routine, it is well over 100 cycles and may not be >> able to keep up with the encoder. > If you are willing t
2012-03-26 by fireweaver
On 3/26/2012 1:33 PM, David Kelly wrote: > On Mar 26, 2012, at 2:57 PM, fireweaver wrote: > >> I have a question of some concern to me, perhaps you could help. >> >> In overview, it involves mixing assembly language and C code. >> >> In detail: >> >> The CPU that I am using is AT
2012-03-26 by fireweaver
I have a question of some concern to me, perhaps you could help. In overview, it involves mixing assembly language and C code. In detail: The CPU that I am using is ATmega328 using AVR Studio 5 as a development environment. I an writing a motor control application that involves a
2012-03-26 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, fireweaver wrote: > The decoder I have does its thing in about 28 cycles. As a C > interrupt routine, it is well over 100 cycles and may not be > able to keep up with the encoder. If you are willing to post the existing assembly code and provide a
2012-03-26 by David Kelly
On Mar 26, 2012, at 2:57 PM, fireweaver wrote: > > I have a question of some concern to me, perhaps you could help. > > In overview, it involves mixing assembly language and C code. > > In detail: > > The CPU that I am using is ATmega328 using AVR Studio 5 as a development > envi
2012-03-26 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, fireweaver wrote: > Can I somehow tell the C compiler that comes with AVR > Studio that these certain five registers are reserved > for the exclusive use of the decoder and therefore avoid > using them in any way? In general, no. It is possible to
2012-03-26 by Jim Wagner
On Mar 25, 2012, at 5:58 PM, Philippe Habib wrote: > Has anyone used the Atmel sample code from ap note AVR135 to read duty cycle of a PWM input? > > I'm using it on an ATMEGa48 and running into some interaction with another timer/counter. I am using the internal oscillator at 8M
2012-03-26 by Philippe Habib
Has anyone used the Atmel sample code from ap note AVR135 to read duty cycle of a PWM input? I'm using it on an ATMEGa48 and running into some interaction with another timer/counter. I am using the internal oscillator at 8Meg as my clock. My PWM input signal goes into PB0/ICP1. I
2012-03-21 by David VanHorn
I just saw the subject line.. Damn autocorrect!! :-P
2012-03-21 by Jim Wagner
On Mar 21, 2012, at 7:23 AM, David VanHorn wrote: > On Wed, Mar 21, 2012 at 3:05 AM, STEVEN HOLDER > wrote: > > David, > > > > If you need to change the sign, you could cast the signbit as a signed char and xor with 0x80, which is the sign bit, would that do the trick as not quie
2012-03-21 by David VanHorn
On Wed, Mar 21, 2012 at 3:05 AM, STEVEN HOLDER wrote: > David, > > If you need to change the sign, you could cast the signbit as a signed char and xor with 0x80, which is the sign bit, would that do the trick as not quiet sure what you are trying to do. That won't get it for me.
2012-03-21 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, David VanHorn wrote: >I need the distortion to be positive or negative.. I've never used avrasm before but I just tried this and it seems to work. .equ SignBit = (0-1) .equ Thing = 5 .db Thing,(Thing + (3*SignBit)), (Thing - (3*SignBit)), Thing Do
2012-03-21 by STEVEN HOLDER
David, If you need to change the sign, you could cast the signbit as a signed char and xor with 0x80, which is the sign bit, would that do the trick as not quiet sure what you are trying to do. Regards ________________________________ From: David V To: AVR-Chat@yahoogroups.com Se
2012-03-21 by David V
All this time working with the AVR, and I've never had to do this... I need a way to change the sign on a term in a .db statement. Something like this: (which does not work..) .equ SignBit = -1; .db Thing,(Thing + (3*SignBit)), (Thing - (3*SignBit)), Thing .and so on.. Otherwise,
2012-03-14 by jrader30
Thank you, Clark, and Jim. I shortened the leads and moved it closer to the Avr dragon board, and that corrected it. I had just read several of the dips using the zif socket I installed on the dragon board with no problem. Ran the leads from the socket to the new chip installed o
2012-03-14 by Jim Wagner
On Mar 13, 2012, at 8:57 PM, Clark Martin wrote: > > On Mar 13, 2012, at 5:48 PM, jrader30 wrote: > > > I wanted to use the Attiny85-su soic chip in place of the larger dip version, all specs are the same as size is supposed to be the only dofference. Using Avr studio 5.1 and the
2012-03-14 by Clark Martin
On Mar 13, 2012, at 5:48 PM, jrader30 wrote: > I wanted to use the Attiny85-su soic chip in place of the larger dip version, all specs are the same as size is supposed to be the only dofference. Using Avr studio 5.1 and the Avr dragon to program. Avr studio says "unable to enter
2012-03-14 by Chuck Hackett
> From: John Samperi > .... > >Sorry for talking to myself so much :-) ... > > That's not what's worrying me, the answering to yourself is a sign of > madness they say... :-) Darn, you obviously know me ... :-) > I don't have one of those chips but I may be able to try it on a M6
2012-03-13 by jrader30
I wanted to use the Attiny85-su soic chip in place of the larger dip version, all specs are the same as size is supposed to be the only dofference. Using Avr studio 5.1 and the Avr dragon to program. Avr studio says "unable to enter programming mode, the read id does not match th
2012-03-13 by John Samperi
At 02:18 AM 14/03/2012, you wrote: >Sorry for talking to myself so much :-) ... That's not what's worrying me, the answering to yourself is a sign of madness they say... :-) I don't have one of those chips but I may be able to try it on a M644p a little later. Regards John Samper
2012-03-13 by Chuck Hackett
> From: Chuck Hackett > .... Sorry for talking to myself so much :-) ... I placed "uint8_t test = EICRA;" after setting EICRA and "test" did have the expected 0x20 in it ... but AVR Studio still shows the EICRA as 0x00 so I think I've confirmed that the Dragon or AVR Studio has a
2012-03-13 by Chuck Hackett
> From: Chuck Hackett > .... > Just found the (non) problem: Apparently AVR Studio (Version 4.18, build > 716) has a bug in it? > .... False alarm, the interrupt is still not working so I'm guessing that the EICRA register really isn't getting set and is still 0x00 ... So origina
2012-03-13 by Chuck Hackett
> From: Chuck Hackett Added info: I am using AVR Studio and a Dragon for the JTAG debug connection. If I attempt to change the EICRA register with AVR Studio it changes but is back to 0x00 after the next statement execution (the statement does not modify the EIARA register). ....
2012-03-13 by Chuck Hackett
I am trying to enable external interrupt 2 to trigger on a falling edge on an ATMega1284p but I am unable to get the proper bits in the EICRA register. I'm using the following: (1) EIMSK &= ~_BV( INT2 ); // Disable external interrupt 2 (2) EICRA &= ~(_BV( ISC21 ) | _BV( ISC20 ));
2012-03-09 by Tim Mitchell
The stuck bit is a weird one, I did change the chip and it was fine then. But I've been using AVR's since they started making them and never seen anything like that before. -- Tim Mitchell
2012-03-08 by Mike Bronosky
Blame it on the sun storm. Mike -- Linux since March 2004 www.counter.li.org Registered Linux User: #482134 Taking up Linux Ubuntu and give-up the Windos habit. Hasta la Vista, Baby. I won't be back! [Non-text portions of this message have been removed]
2012-03-08 by David VanHorn
> I fixed the second problem, it turned out to be a problem with the oscillator - it was not set to "full swing" and an LED power supply near the processor was causing the oscillator to stop and do unpredictable things. Very strange symptoms though. From a better console: I've se
2012-03-08 by Dave
The low power oscillator is evil. Tim Mitchell wrote: >It's not in any debugger... I found out what was going on by writing values to eeprom then reading it back using AVRISP. > > >I fixed the second problem, it turned out to be a problem with the oscillator - it was not set to "
2012-03-08 by Zack Widup
It's possibly a bad chip. Does only one Mega88 have this problem? Have you tried substituting another? Bad Chips DO get sold once in a while. Zack On Thu, Mar 8, 2012 at 10:42 AM, Dave wrote: > ** > > > Is this by chance in the debugger or jtag ice? > > > Tim Mitchell wrote: > >