Hello How can I use JTAG interface for "on chip " debugging ? My question is what hardware I need for debuging , and if I must buy an expensive tool from Atmel or I can find something on the net to replace it . I know that , the software is AVR Studio . Many Thanks Flavius AVR-Chat@yahoogroups.com wrote: There are 25 messages in this issue. Topics in this digest: 1. RE: Oscillator Lock?!?! From: "Brian Fairchild" 2. Re: back-up power supply circuit From: VA3TO 3. Re: Oh come on now... From: VA3TO 4. RE: Oscillator Lock?!?! From: David VanHorn 5. Re: back-up power supply circuit From: John Johnson 6. Re: Oscillator Lock?!?! From: John Johnson 7. Re: Oscillator Lock?!?! From: David VanHorn 8. Re: Oscillator Lock?!?! From: John Johnson 9. Re: Oscillator Lock?!?! From: David VanHorn 10. AVR Compiler: which is the best From: "markevans_1" 11. Re: AVR Compiler: which is the best From: David VanHorn 12. Re: back-up power supply circuit From: John Johnson 13. Re: AVR Compiler: which is the best From: VA3TO 14. Re: AVR Compiler: Bascom From: VA3TO 15. RE: AVR Compiler: which is the best From: "Larry Barello" 16. Re: AVR Compiler: which is the best From: John Johnson 17. Re: Hello and EMI/RFI From: "Stefan Wimmer" 18. Re: Re: Hello and EMI/RFI From: VA3TO 19. Re: Wanted: unused Dev boards, Butterfly etc.. From: "upand_at_them" 20. RE: AVR Compiler: which is the best From: "stevech" 21. Re: back-up power supply circuit From: "Wagner Lipnharski" 22. Re: AVR Compiler: which is the best From: "Wagner Lipnharski" 23. Re: Re: Hello and EMI/RFI From: John Johnson 24. Re: Re: Hello and EMI/RFI From: David VanHorn 25. Re: back-up power supply circuit From: jay marante ________________________________________________________________________ ________________________________________________________________________ Message: 1 Date: Sun, 14 Mar 2004 09:46:45 -0000 From: "Brian Fairchild" Subject: RE: Oscillator Lock?!?! They are not equal on the STK300 and there is no reason they should be equal. -----Original Message----- From: LightYearCS [mailto:lightyearcs@zippnet.net] Sent: 14 March 2004 09:27 To: AVR-Chat@yahoogroups.com Subject: RE: [AVR-Chat] Oscillator Lock?!?! Thanks for putting this behind me. I didn't think it was a problem. I only heard this from one person and a Atmel field engineer who thought he heard it. I'll probably ask in a couple other forums just to make sure. Barry -----Original Message----- From: Kathy Quinlan [mailto:kat-yahoo@kaqelectronics.dyndns.org] Sent: Sunday, March 14, 2004 12:32 AM Subject: RE: [AVR-Chat] Oscillator Lock?!?! -----Original Message----- From: LightYearCS [mailto:lightyearcs@zippnet.net] Sent: Sunday, 14 March 2004 10:39 AM Subject: [AVR-Chat] Oscillator Lock?!?! Ladies and Gentlemen: This is a rumor I heard. Even a field engineer thinks he heard of this also. It's said that if you use the same values for each of the capacitors used in the crystal oscillator circuit that sometimes the oscillator will not start up and remain in a state of lockup. Has anyone else heard of this? ROFLMAO ok the only time the 2 caps are not equal is when you are tuning the crystal (look at some old 1802 cpu designs, this was common) BUT 99% of designs these days use EQUAL caps, when caps are needed (some uC's eg the AT43USB355E does not have external caps as they are internal to the uC) I think someone is talking rubbish. Regards, Kat. [This message contained attachments] ________________________________________________________________________ ________________________________________________________________________ Message: 2 Date: Sun, 14 Mar 2004 07:28:43 -0500 From: VA3TO Subject: Re: back-up power supply circuit I like the KISS approach... Depending on your needs, you can use a SPDT relay with a mains powered coil. When the power is on, the relay is energized and the N.O. contacts closed to make the DC circuit from power supply to your MCU board. (common to the MCU board, NO to the power supply + and NC to the battery +). If the mains power cuts out, the relay will release and make the NC contacts circuit which can is wired to the battery. A big electrolytic cap across the DC input can be selected to maintain the supply voltage while the relay switches over so that your board doesn't drop out and also to help absorb the switching voltage spike. Hugh jaythesis wrote: >hi! > >does anyone have a circuit design on back-up power supply? like if >the main power is cut-off, the battery automatically takes over to >supply the MCU. can i have the design? > >thanks in advance. > >-jay > > ________________________________________________________________________ ________________________________________________________________________ Message: 3 Date: Sun, 14 Mar 2004 07:43:10 -0500 From: VA3TO Subject: Re: Oh come on now... [This message is not in displayable format] ________________________________________________________________________ ________________________________________________________________________ Message: 4 Date: Sun, 14 Mar 2004 08:26:08 -0500 From: David VanHorn Subject: RE: Oscillator Lock?!?! At 09:46 AM 3/14/2004 +0000, Brian Fairchild wrote: >They are not equal on the STK300 and there is no reason they should be equal. Sorry, that's wrong. The two caps absolutely should be equal, unless you have a good reason for them not to be. The two caps are in series, from the crystal's point of view, and in parallel with the parasitics on the board. The formulae from the various crystal manufacturers to determine the crystal cap values all reflect this, and they all result in equal values. Even when you are tuning the crystal to a specific frequency, your goal is to arrive at equal values, but being a few pF off balance isn't as important as having the crystal on frequency, in those applications. ________________________________________________________________________ ________________________________________________________________________ Message: 5 Date: Sun, 14 Mar 2004 08:33:56 -0500 From: John Johnson Subject: Re: back-up power supply circuit Here's a rough sketch: http://homepage.mac.com/johnatl/FileSharing25.html Regards, JJ On Sunday, Mar 14, 2004, at 00:55 US/Eastern, jaythesis wrote: > hi! > > does anyone have a circuit design on back-up power supply? like if > the main power is cut-off, the battery automatically takes over to > supply the MCU. can i have the design? > > thanks in advance. > > -jay > > > > > Yahoo! Groups Links > > > > > ________________________________________________________________________ ________________________________________________________________________ Message: 6 Date: Sun, 14 Mar 2004 08:38:57 -0500 From: John Johnson Subject: Re: Oscillator Lock?!?! Not to split hairs here, but the two caps will never be equal. Regards, JJ On Saturday, Mar 13, 2004, at 21:39 US/Eastern, LightYearCS wrote: > Ladies and Gentlemen: > > > > This is a rumor I heard. Even a field engineer thinks he > heard of this also. > > > > It�s said that if you use the same values for each of the > capacitors used in the crystal oscillator circuit that sometimes the > oscillator will not start up and remain in a state of lockup. Has > anyone else heard of this? > > > > Oh, and by the way, how many SPI devices do you think the > ATmega64 can handle, hrm??J > > > > Barry > > > > > > Yahoo! Groups Links > > � To visit your group on the web, go to: > http://groups.yahoo.com/group/AVR-Chat/ > > � To unsubscribe from this group, send an email to: > AVR-Chat-unsubscribe@yahoogroups.com > > � Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. > [This message contained attachments] ________________________________________________________________________ ________________________________________________________________________ Message: 7 Date: Sun, 14 Mar 2004 08:45:54 -0500 From: David VanHorn Subject: Re: Oscillator Lock?!?! At 08:38 AM 3/14/2004 -0500, John Johnson wrote: >Not to split hairs here, but the two caps will never be equal. I think you're very much splitting hairs. Look at the crystal manufacturer's data sheets, and tell me where they show unequal values in any normal application. Or are you making the case, that like two resistors, they may be 0.001% off no matter how carefully they match them? ________________________________________________________________________ ________________________________________________________________________ Message: 8 Date: Sun, 14 Mar 2004 08:51:00 -0500 From: John Johnson Subject: Re: Oscillator Lock?!?! On Sunday, Mar 14, 2004, at 08:45 US/Eastern, David VanHorn wrote: > At 08:38 AM 3/14/2004 -0500, John Johnson wrote: > >> Not to split hairs here, but the two caps will never be equal. > Or are you making the case, that like two resistors, they may be > 0.001% off no matter how carefully they match them? Yes. I was implying that if the two caps have to be unequal for oscillation to start, it will always start. Regards, JJ ________________________________________________________________________ ________________________________________________________________________ Message: 9 Date: Sun, 14 Mar 2004 09:02:13 -0500 From: David VanHorn Subject: Re: Oscillator Lock?!?! At 08:51 AM 3/14/2004 -0500, John Johnson wrote: >On Sunday, Mar 14, 2004, at 08:45 US/Eastern, David VanHorn wrote: > >> At 08:38 AM 3/14/2004 -0500, John Johnson wrote: >> >>> Not to split hairs here, but the two caps will never be equal. >> Or are you making the case, that like two resistors, they may be >> 0.001% off no matter how carefully they match them? > >Yes. I was implying that if the two caps have to be unequal for >oscillation to start, it will always start. They do NOT have to be unequal. Where does that idea come from? In order to have oscillation, you need only these things: Gain > 1.0 Phase shift at frequency of interest, 180 degrees. and a closed loop. ________________________________________________________________________ ________________________________________________________________________ Message: 10 Date: Sun, 14 Mar 2004 15:14:17 -0000 From: "markevans_1" Subject: AVR Compiler: which is the best Ok, I hope this message isnt the start of a huge thread, but I would like biased/unbiased opinions on what you guys recon is the best compiler for the AVR microcontroller. Basically I want something that is cheap, ideally comes with a fuctional IDE and is quick to code with ( has built in libraries, language maps easily to AVR, and is as high level as possible) and at the same time has the abilty to do low level stuff when speed is required ie: inline assembly. It needs to compile fast and generate small code and needs to support AVRs which have no RAM. Not too fussed about language as long as it meets all my above criteria, but I suppose I have some preference to C. Hope you can help Mark. ________________________________________________________________________ ________________________________________________________________________ Message: 11 Date: Sun, 14 Mar 2004 10:37:16 -0500 From: David VanHorn Subject: Re: AVR Compiler: which is the best At 03:14 PM 3/14/2004 +0000, markevans_1 wrote: >Ok, I hope this message isnt the start of a huge thread, but I would >like biased/unbiased opinions on what you guys recon is the best >compiler for the AVR microcontroller. Is there a bad one? The AVR was designed for C, but there's Basic, Forth, and probably others out there. ________________________________________________________________________ ________________________________________________________________________ Message: 12 Date: Sun, 14 Mar 2004 08:41:15 -0500 From: John Johnson Subject: Re: back-up power supply circuit Sorry, it's the backup.jpg file. Regards, JJ On Sunday, Mar 14, 2004, at 08:33 US/Eastern, John Johnson wrote: > Here's a rough sketch: > > http://homepage.mac.com/johnatl/FileSharing25.html > > Regards, > JJ > > On Sunday, Mar 14, 2004, at 00:55 US/Eastern, jaythesis wrote: > >> hi! >> >> does anyone have a circuit design on back-up power supply? like if >> the main power is cut-off, the battery automatically takes over to >> supply the MCU. can i have the design? >> >> thanks in advance. >> >> -jay >> >> >> >> >> Yahoo! Groups Links >> >> >> >> >> > > > > ------------------------ Yahoo! Groups Sponsor > ---------------------~--> > Upgrade to 128-bit SSL Security! > http://us.click.yahoo.com/LPJzrA/yjVHAA/TtwFAA/dN_tlB/TM > --------------------------------------------------------------------- > ~-> > > > Yahoo! Groups Links > > > > > ________________________________________________________________________ ________________________________________________________________________ Message: 13 Date: Sun, 14 Mar 2004 12:24:55 -0500 From: VA3TO Subject: Re: AVR Compiler: which is the best I never took to C and I usually prefer assembler but when it comes to the AVR, I am partial to Bascom. Todays Basic compilers are much more structured & efficient and have come a long way since the days of GOTO 100. "This is not your father's Basic" :) Bascom has a lot of built-in functions, it's quick and easy to get something up and running and there are lots of samples and support for it. You can also do inline assembler code anywhere you need it. It's inexpensive yet powerful. You can get it for US$59 from Rhombus (www.rhombus-tek.com) in the US or directly from the author (www.mselec.com) in Europe. (No commercial interest, just my biased opinion :) Hugh markevans_1 wrote: >Ok, I hope this message isnt the start of a huge thread, but I would >like biased/unbiased opinions on what you guys recon is the best >compiler for the AVR microcontroller. > >Basically I want something that is cheap, ideally comes with a >fuctional IDE and is quick to code with ( has built in libraries, >language maps easily to AVR, and is as high level as possible) and >at the same time has the abilty to do low level stuff when speed is >required ie: inline assembly. It needs to compile fast and generate >small code and needs to support AVRs which have no RAM. > >Not too fussed about language as long as it meets all my above >criteria, but I suppose I have some preference to C. > >Hope you can help >Mark. > > > > >Yahoo! Groups Links > > > > > > > > ________________________________________________________________________ ________________________________________________________________________ Message: 14 Date: Sun, 14 Mar 2004 12:28:22 -0500 From: VA3TO Subject: Re: AVR Compiler: Bascom Sorry...Bascom is $85 ($59 if you're a student or cross upgrading from Bascom-8051). Still a deal ! Hugh ________________________________________________________________________ ________________________________________________________________________ Message: 15 Date: Sun, 14 Mar 2004 09:51:00 -0800 From: "Larry Barello" Subject: RE: AVR Compiler: which is the best I second BASCOM as easy and quick. It is terrible for large or complex as the code generation is mediocre at best. But if you use mainly the library support (e.g. keyboard input, LCD output, one wire interface, etc), those are all written in assembly and are generally very tight. So for simple projects with little BASIC and mostly calls to library functions it actually makes very small code. You can try it out for free: a 2k limited version is available for download at www.mcselec.com I wrote a FSM multi-tasking robot control code with something like 7 tasks and five sensors and two motors all in about 180 lines of code that fit in the 2k limit. So it is pretty usable for small projects. Look here for the sample code: http://www.barello.net/ARC If you want cheap (free): GCC C compiler (www.winavr.net) but no tightly integrated IDE. But, probably the best code generation around. You do have to learn about makefiles and become familiar with how the compiler works to get the best code. So you pay for the free price with the learning curve. Imagecraft and Codevision both have tight IDEs, but I can't vouch for their quality over large projects. I believe they are adequate. Imagecraft is more traditional with libraries & linkers and that probably supports large projects better than CV which has only one file (but uses includes to simulate libraries). IAR has the expensive industrial strength compiler, but at $1800/seat it is out of my pocket book. -----Original Message----- From: VA3TO I never took to C and I usually prefer assembler but when it comes to the AVR, I am partial to Bascom. Todays Basic compilers are much more structured & efficient and have come a long way since the days of GOTO 100. "This is not your father's Basic" :) Bascom has a lot of built-in functions, it's quick and easy to get something up and running and there are lots of samples and support for it. You can also ________________________________________________________________________ ________________________________________________________________________ Message: 16 Date: Sun, 14 Mar 2004 13:04:58 -0500 From: John Johnson Subject: Re: AVR Compiler: which is the best BASCOM is great for getting results in a hurry. One of my reservations with it is it's strange behavior when you mix a keyword into a variable name. Off the top of my head: support = &h12 Might get misinterpreted because support contains the word port. Again, that's just an example off the top of my head. Another reservation is it's inability to handle complex arithmetic in an expression, for example: day = whatser / 12 * questo + 2 Again, just an example off the top of my head. I think both problems stem from the fact that it is a code generator (for lack of a better term), rather than a compiler. I generally use WinAVR. When in doubt about whether there is a problem with my C or my hardware, I sometimes use BASCOM to verify the hardware. WinAVR supports devices without RAM using assembly code. Not sure about BASCOM. There are a lot of good resources and opinions at the avrfreaks web site. Regards, JJ On Sunday, Mar 14, 2004, at 12:24 US/Eastern, VA3TO wrote: > I never took to C and I usually prefer assembler but when it comes to > the AVR, > I am partial to Bascom. Todays Basic compilers are much more > structured > & efficient and have come a long way since the days of GOTO 100. > "This is not your father's Basic" :) > Bascom has a lot of built-in functions, it's quick and easy to get > something > up and running and there are lots of samples and support for it. You > can > also > do inline assembler code anywhere you need it. It's inexpensive yet > powerful. > You can get it for US$59 from Rhombus (www.rhombus-tek.com) in the US > or directly from the author (www.mselec.com) in Europe. > > (No commercial interest, just my biased opinion :) > > Hugh > > > markevans_1 wrote: > >> Ok, I hope this message isnt the start of a huge thread, but I would >> like biased/unbiased opinions on what you guys recon is the best >> compiler for the AVR microcontroller. >> >> Basically I want something that is cheap, ideally comes with a >> fuctional IDE and is quick to code with ( has built in libraries, >> language maps easily to AVR, and is as high level as possible) and === message truncated === Do you Yahoo!? Yahoo! Mail - More reliable, more storage, less spam
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JTAG interface for debug
2004-03-15 by flavius