Re: [lpc2000] Re: For C novices
2006-03-31 by Clyde Stubbs
... Indeed. I d love to have a dollar for every time someone wrote such code, then complained when the code doesn t port unchanged to a different architecture
Messages
Browse messages
Page 34 of 329 · 16407 messages matched
Re: [lpc2000] Does IAR kickstart IDE support any other jtag dongles beside their?
2006-03-31 by Leon Heller
... From: tinia0 To: Sent: Friday, March 31, 2006 11:25 AM Subject: [lpc2000] Does IAR kickstart IDE
Does IAR kickstart IDE support any other jtag dongles beside their?
2006-03-31 by tinia0
Hi, I wonder if IAR Kickstart supports any other jtag dongles besideg their j-link. I ve just bought MCB2100 (with ULINK JTAG dongle) from Keil and would love
Re: For C Experts
2006-03-31 by Thiadmer Riemersma (ITB CompuPhase)
This is what The C Programming Language 2nd edition (Kernighan & Ritchie) says (page 199): A pointer to one type may be converted to a pointer to another
RE: [lpc2000] Re: For C Experts
2006-03-31 by Paul Curtis
Hi, ... Bloody hell no. Insanity. -- Paul Curtis, Rowley Associates Ltd http://www.rowley.co.uk CrossWorks for ARM, MSP430, AVR, MAXQ, and now Cortex-M3
RE: [lpc2000] Re: For C Experts
2006-03-31 by Paul Curtis
Hi, ... Are you just lucky, too, that the byte order of multi-byte items works? ;-) If you were porting from, say, a 68HC11 then you d be royally screwed with
RE: [lpc2000] Re: For C Experts
2006-03-31 by Paul Curtis
Hi, ... C90 has been a standard for 16 years which is more than long enough for engineering firms to understand that if they want to move up to 32 bits then
Re: For C Experts
2006-03-31 by brendanmurphy37
This is also non-portable. Brendan ... problem, because the union is ... you ... compilers, ... objects. ... two
Re: For C Experts
2006-03-31 by brendanmurphy37
Dave, Sorry to be blunt, but you are incorrect when you state the left and right are not the same types. This might explain why you think the compiler is in
Re: [lpc2000] Re: For C Experts
2006-03-31 by Sten
Hello, Another solution I had last night which should fix the alignment-problem, because the union is compiler will align this union to its biggest member:
Re: For C Experts
2006-03-31 by brendanmurphy37
Dave, ... should doesn t come into it! You have explicitley told the compiler exectly how you want it treated (the (int *) ). Now if you had one of those
Re: [lpc2000] DSP
2006-03-31 by David Hawkins
... I have the following book at home; ARM System Developer s Guide, First Edition : Designing and Optimizing System Software (The Morgan Kaufmann Series in
DSP
2006-03-31 by heedaf
Does anyone have a sample of C code for implementing a bandpass filter for the LPC21xx? Thanks, Dewayne
Re: Flashless LPC2210, flash download?
2006-03-31 by volunteer_sysu
Hello, Dominic I wonder whether I can use the schema of the JTAG in your document Open On-chip Debugger to make a JTAG interface. Then I can use it to debug
Re: For C Experts
2006-03-31 by jayasooriah
Hi Dave, I see the problem you raise, but I am not sure if there is a clean solution. While all arrays may be packed, this does not mean that objects are not
Re: [lpc2000] Re: For C Experts
2006-03-31 by Robert Adsett
... Another approach that makes a lot of sense its if this is going to/coming from a communications interface is to leave the structures alone (ie use the same
Re: [lpc2000] Re: For C Experts
2006-03-31 by Robert Adsett
... I used a number that don t. Most notably the one for a CRAY XMP (64 bit alignment, except for character pointers) Robert Freedom has no meaning of
Re: Speech Recognition Software
2006-03-31 by dsidlauskas1
Thanks Leon. Unfortunately I need speaker independent recognition. Just the numbers one to 9 would be useful. Dave S. ... of using ... software, ... for the
Re: [lpc2000] Re: For C Experts
2006-03-31 by Robert Adsett
... Sure they are the same type, you told the compiler they were the same type. It went away assuming that you knew what you were talking about. Silly
Re: [lpc2000] For C Experts
2006-03-31 by Robert Adsett
... As I said earlier I was curious as to what lint (in may case PC-Lint) would make of this. So I added the following to one of my files void check( void) {
Re: For C Experts
2006-03-31 by dsidlauskas1
Jaya, The vanilla cast is only to be treated as a byte packed cast if the object that is being cast is itself byte packed. In thinking about my original
Re: [lpc2000] Re: For C Experts
2006-03-31 by Robert Adsett
... ... It s more than weasel room it s an intimate and integral part of the language and has been for over 20 years. IE it s a PRE-ANSI requirement.
Re: [lpc2000] How to locate a 'const' in flash
2006-03-31 by 42Bastian Schick
... AFAIK there is no standard way to achieve this. But with all the different compilers I use, static const int a = 30; works. Or use a pragma to place a
Re: [lpc2000] Re: For C Experts
2006-03-31 by Robert Adsett
... Only if the compiler understands pragma packed(1) to mean byte alignment in the following structure. Far from a sure thing. The compiler is quite allowed
IAP doc/example error for result array size (LPC21xx) ?
2006-03-31 by phmaresh4
All - I ve just joined this board to see if there s any info on IAP issues. There seems to be ... a lot. But one particular that I haven t seen mentioned
Re: [lpc2000] Re: For C Experts
2006-03-31 by David Hawkins
Here s a another couple of comments to provide you some context for this type of problem, i.e., of interpreting the contents of a binary data stream; Machine
Re: For C Experts
2006-03-31 by garycordelli
Dave, Just a postscript: this is not an academic notion to which I allude, but a common error in just the kind of code I am paid to fix every day. The
Re: For C Experts
2006-03-31 by jayasooriah
Dave, If I understand you (now more correctly): because byte packing is default, you want a vanilla cast (without __packed prefix) to be treated as byte packed
Re: For C Experts
2006-03-31 by sonny945852001
Dave, x[4] = *ip; I thought array index in C starts at zero so valid index for x is only 0,1,2,3 ? Sonny
Re: For C Experts
2006-03-31 by dsidlauskas1
Jaya, I don t think I m asking it to connect the two statements. What I m expecting it to do is to recognize that buf is a byte packed object (the defalt for
Re: For C Experts
2006-03-31 by dsidlauskas1
Cordeg, Thanks for taking the time to comment. You ve presented a though case, but I m not going to let my compiler off so easily :-). In your case I think the
Re: For C Experts
2006-03-31 by dsidlauskas1
Richard, The best Fortran programs are written after you spill the box of cards; rewriting the code may be faster and better. Been there. Done that. Thanks
Re: For C Experts
2006-03-31 by jayasooriah
Dave, I think what you are asking of the compiler is to connect the two statements in the for() loop. Compilers do not have this capability. Even if it did,
Re: For C Experts
2006-03-31 by garycordelli
Dave: While what you said may sound reasonable to humans, it is demonstrably not so certain in software. :-) To be specific, what you have in your original
Re: For C Experts
2006-03-31 by Guillermo Prandi
This is indeed a strange piece of code: char buf[]={1,2,3,4,5,6,7,8}; int *ip, x[10]; for (i=0; i
Re: For C Experts
2006-03-31 by rtstofer
... I guess I don t see why the compiler should do anything. You asked it to cast the ADDRESS of a byte in memory to an int * which is an address (by
Re: For C Experts
2006-03-31 by dsidlauskas1
Jaya, Since the compiler knows that buf is a byte aligned object, woutldn t it be resonable for the compiler to treat (int *)&buf[i] as (__packed int *)&buf[i]
Re: For C Experts
2006-03-31 by dsidlauskas1
Brendan, You make a good case in your second paragraph. The exampe I ve presented is just a toy problem. The real case is porting a lot of old Z80 code where
Re: For C Experts
2006-03-30 by dsidlauskas1
Jaya, Thanks. The x[4] was a blunder on my part when I wrote the message. Make it x[10]. Your second point is the key issue. Why can t the compiler understand
Re: For C Experts
2006-03-30 by dsidlauskas1
ints are not always word aligned. For example: #pragma packed(1) struct eg { char x; int y; char z; int w; }test; One of the integers in this structure is not
Re: For C Experts
2006-03-30 by jayasooriah
Dave, The satement x[4] = ... trashes memory where the the fifth element of the array x[] would normally exist, because you have declared it as x[4]
Re: For C Experts
2006-03-30 by dsidlauskas1
Whoops, too much MatLab lately. Make it x[10].
Re: For C Experts
2006-03-30 by dsidlauskas1
Ed, Yes, __packed works, but I m porting a bunch of old 8 bit code that doesn t have this sort of problems and its hard to find all of the places where its
Re: For C Experts
2006-03-30 by dsidlauskas1
OK. To the intent. I ve got a lot of code written for an 8 bit Z80 controller to port. It does a lot of parsing of data out of communications buffers, thus
Re: For C Experts
2006-03-30 by jayasooriah
Dave, To us the unaligned pointer assignment is obvious when we look at it in context. To the compiler, that line alone is not enough to say that assignment is
Re: For C Experts
2006-03-30 by brendanmurphy37
Dave, O.K. but your explicit type cast is effectively saying to the compiler I know what I m doing . I don t have any good C reference to hand, so I can t
Printf-like function for serial port and other examples for GNU-Keil
2006-03-30 by tinia0
Hi, I m seeking for printf-like function for serial port (interrupt driven). Also would be happy to learn from as many examples as possible. I m using Keil
Re: For C Experts
2006-03-30 by dsidlauskas1
Brendan, The information to the compiler is in the line: ip = (int *)&buf[i]; Where it should be clear that the pointer is to an unaligned int. Dave S.
Re: For C Experts
2006-03-30 by jayasooriah
Hello Dave, I see two errors in the program that the KEIL compiler (justifiably IMHO) does not pick up. The first error, assignment #1 in for loop, explicitly
Re: [lpc2000] Flashless LPC2210, flash download?
2006-03-30 by Robert Adsett
... Well, you could use the serial ISP to bootstrap the programming routines into RAM. That s how some serial ISPs work even for internal flash. The ST10 as