RE: [avr-gcc-list] Legal registers
Out of interest, why not just reserve the register, as per:
http://www.nongnu.org/avr-libc/user-manual/FAQ.html#faq_regbind
For example
#include avr/io.h
#include avr/signal.h
#include avr/interrupt.h
register unsigned char counter asm(r3);
int main()
{
EICRA |= (1ISC01);
EIMSK |= (1INT0);
sei();
for(;;)
PORTA = counter;
return 0;
}
SIGNAL(SIG_INTERRUPT0)
{
counter++;
}
this example compiles ok, but I strangely believe that the register modifier
is not really intended to be used globally - for example I've not tested if
it actually stops gcc from using r3 in an externally linked file.
Regards,
Ben
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Haase
Bjoern (PT-BEU/EMT) *
Sent: Monday, 6 June 2005 3:26 PM
To: avr-gcc-list@nongnu.org
Subject: AW: [avr-gcc-list] Legal registers
For implementing, e.g. a context switch between two tasks you will have to
safe *all* registers and the stack pointer. There is a distinction between
different uses of the lower and the higher registers concerning the calling
convention (the called function may safely overwrite a certain subset of
registers without saving them), but that does not prevent gcc to take profit
of all of the registers.
Yours,
Björn
-Ursprüngliche Nachricht-
Von: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Im
Auftrag von Ron
Gesendet: Sonntag, 5. Juni 2005 10:03
An: avr-gcc-list@nongnu.org
Betreff: [avr-gcc-list] Legal registers
Hi All. Does it somewhere specify that avrgcc and its library routines
should only use a subset of the AVR registers (say 0,1,18-31), or can
the whole 32 be used if required? I ask because it would save a deal of
pushing and popping in a preemptive os if you knew for sure register
subset x would never be used.
Ron Kreymborg
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[avr-gcc-list] Legal registers
IMO this should work given that
1.) you mark r3 to be a fixed register by gcc's compile switches
2.) for all of the externally linked files you have been using these compile
switches
3.) all other assembler source files follow this convention
.
IMO, it will only be possible to do this with registers r2...r7 . All of the
other registers are possibly used for specialized purposes like parameter
passing and may not be marked as fixed without causing problems, IIRC.
Yours,
Björn
-Ursprüngliche Nachricht-
Von: Ben Mann [mailto:[EMAIL PROTECTED]
Gesendet: Montag, 6. Juni 2005 10:11
An: Haase Bjoern (PT-BEU/EMT) *; avr-gcc-list@nongnu.org; 'Ron'
Betreff: RE: [avr-gcc-list] Legal registers
Out of interest, why not just reserve the register, as per:
http://www.nongnu.org/avr-libc/user-manual/FAQ.html#faq_regbind
For example
#include avr/io.h
#include avr/signal.h
#include avr/interrupt.h
register unsigned char counter asm(r3);
int main()
{
EICRA |= (1ISC01);
EIMSK |= (1INT0);
sei();
for(;;)
PORTA = counter;
return 0;
}
SIGNAL(SIG_INTERRUPT0)
{
counter++;
}
this example compiles ok, but I strangely believe that the register modifier
is not really intended to be used globally - for example I've not tested if
it actually stops gcc from using r3 in an externally linked file.
Regards,
Ben
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Haase
Bjoern (PT-BEU/EMT) *
Sent: Monday, 6 June 2005 3:26 PM
To: avr-gcc-list@nongnu.org
Subject: AW: [avr-gcc-list] Legal registers
For implementing, e.g. a context switch between two tasks you will have to
safe *all* registers and the stack pointer. There is a distinction between
different uses of the lower and the higher registers concerning the calling
convention (the called function may safely overwrite a certain subset of
registers without saving them), but that does not prevent gcc to take profit
of all of the registers.
Yours,
Björn
-Ursprüngliche Nachricht-
Von: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Im
Auftrag von Ron
Gesendet: Sonntag, 5. Juni 2005 10:03
An: avr-gcc-list@nongnu.org
Betreff: [avr-gcc-list] Legal registers
Hi All. Does it somewhere specify that avrgcc and its library routines
should only use a subset of the AVR registers (say 0,1,18-31), or can
the whole 32 be used if required? I ask because it would save a deal of
pushing and popping in a preemptive os if you knew for sure register
subset x would never be used.
Ron Kreymborg
___
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Re: [avr-gcc-list] WinAVR- Windows 98 issues
Hi, On Fri, 03 Jun 2005 17:07:03 +0530, E. Weddington [EMAIL PROTECTED] wrote: Royce Sharal Pereira wrote: Hi, I just observed, that while installing winAVR on Win 98 SE, the directories are not added to the path, inspite of ticking it in the install options. As a result, the compiler or make.exe etc cant be found... This problem is not there with Win XP. --Royce. Even after reboot? Yes, I selected the reboot Now option at the end of the installation. And the paths were still not added. I also checked with path command at the DOS prompt Thanks, --Royce. -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ ___ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
[avr-gcc-list] bootloader help
Hello all, Perhaps there is ready documentation on bootloader, but I have not been able to get what I wanted. How does one declare a programme to be bootloader program? that is the code must be loaded in the bootsection when I program the chip using avrisp. How does one set the starting address of this code? this is needed as there are different boot loader program sizes. I want to laod programme in the boot section which will test a port bit and jump to if not low. From I want to laod a sample program which may pulse an LED. How can I do this? Thank you all. Regards Nayani P __ Discover Yahoo! Use Yahoo! to plan a weekend, have fun online and more. Check it out! http://discover.yahoo.com/ ___ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
Re: [avr-gcc-list] WinAVR- Windows 98 issues
Royce Sharal Pereira wrote: Hi, On Fri, 03 Jun 2005 17:07:03 +0530, E. Weddington [EMAIL PROTECTED] wrote: Royce Sharal Pereira wrote: Hi, I just observed, that while installing winAVR on Win 98 SE, the directories are not added to the path, inspite of ticking it in the install options. As a result, the compiler or make.exe etc cant be found... This problem is not there with Win XP. --Royce. Even after reboot? Yes, I selected the reboot Now option at the end of the installation. And the paths were still not added. I also checked with path command at the DOS prompt And this is with the latest WinAVR release? Thanks Eric ___ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
Re: [avr-gcc-list] WinAVR- Windows 98 issues
Hi, On Mon, 06 Jun 2005 20:39:05 +0530, E. Weddington [EMAIL PROTECTED] wrote: Royce Sharal Pereira wrote: Hi, On Fri, 03 Jun 2005 17:07:03 +0530, E. Weddington [EMAIL PROTECTED] wrote: Royce Sharal Pereira wrote: Hi, I just observed, that while installing winAVR on Win 98 SE, the directories are not added to the path, inspite of ticking it in the install options. As a result, the compiler or make.exe etc cant be found... This problem is not there with Win XP. --Royce. Even after reboot? Yes, I selected the reboot Now option at the end of the installation. And the paths were still not added. I also checked with path command at the DOS prompt And this is with the latest WinAVR release? Yes WinAVR-20050214-install.exe. But I'm curious no one else experienced this...probably I'm doing something wrong? Thanks, --Royce. -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ ___ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
[avr-gcc-list] Looking for bootloader
Hello, I have several avr's connected by an RS-485 serial line. I'm looking for a bootloader that will work with avrdude and can be compiled under gcc, and which I can modify to properly handle talking over my bus. I've found a couple gcc bootloaders so far, but none of them seem to work with avrdude. Thanks. ___ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
Re: [avr-gcc-list] Looking for bootloader
Isn't avrdude an isp? Not a bootloader type programmer? I could be totally off the mark. My suggestion given this type of configuration would be to roll your own bootloader code and loader app. Then you can build the bus controlling logic into the bootloader. (ie for selecting which avr to prog) I'd be suprised if there was code out there. Regards Neil Davey Hello, I have several avr's connected by an RS-485 serial line. I'm looking for a bootloader that will work with avrdude and can be compiled under gcc, and which I can modify to properly handle talking over my bus. I've found a couple gcc bootloaders so far, but none of them seem to work with avrdude. Thanks. ___ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list -- -- Neil Davey Griffith University School of Microelectronic Engineering Nathan Campus Phone: 07-3875-7008 Fax: 07-3875-5112 School of Psychology - ACNRC Mt Gravatt Campus Phone: 07-3875-3395 -- ___ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
RE: [avr-gcc-list] Looking for bootloader
Hi, I hope you do find one. I would not automatically expect one to be readily available - RS485 is half duplex and can feature timing issues in the driver control lines. If the devices are on a bus you must have a device address packed in with the programming data - this can be both rather application specific and rule out common programming software. Ben -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Michael Giambalvo Sent: Tuesday, 7 June 2005 9:02 AM To: Neil Davey Cc: AVR-GCC-list@nongnu.org Subject: Re: [avr-gcc-list] Looking for bootloader Sorry, I should have been more explicit. I'm running on a short time frame, so I don't really have time to write a bootloader and the programmer app for it. My application can handle the bus logic, then reset into the bootloader when the bus is cleared for programming. The modification I would need to make to the bootloader's code amounts to setting a pin high before each transmit and low when the transmit is complete - a very simple modification, I just need the source so I can do it. As I said, I don't have time to develop the programming app, and using avrstudio isn't an option. I'm hoping for a bootloader that supports the stk500, avr910, or somesuch protocol like that, and could be used directly with avrdude (or uisp for that matter) I'd be really surprised if such a project didn't exist. I've found a couple of bootloaders already that work with avrstudio. Anyone have any good leads? Is there an open source port of the butterfly bootloader to gcc? I believe that works with avrdude. On 6/6/05, Neil Davey [EMAIL PROTECTED] wrote: Isn't avrdude an isp? Not a bootloader type programmer? I could be totally off the mark. My suggestion given this type of configuration would be to roll your own bootloader code and loader app. Then you can build the bus controlling logic into the bootloader. (ie for selecting which avr to prog) I'd be suprised if there was code out there. Regards Neil Davey Hello, I have several avr's connected by an RS-485 serial line. I'm looking for a bootloader that will work with avrdude and can be compiled under gcc, and which I can modify to properly handle talking over my bus. I've found a couple gcc bootloaders so far, but none of them seem to work with avrdude. Thanks. ___ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list -- -- Neil Davey Griffith University School of Microelectronic Engineering Nathan Campus Phone: 07-3875-7008 Fax: 07-3875-5112 School of Psychology - ACNRC Mt Gravatt Campus Phone: 07-3875-3395 -- ___ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list ___ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
[avr-gcc-list] Array element in inline assembly
Could someone help me out, I want to use the load an array element into a register. When I do this: asm(lds r16, array+n::); Where n is the array element I want, it works fine. But what I want to do it this: asm(lds r16, array[element]::); That gives me the following error: Error: garbage at end of file I've also tried passing it as an arguement, but can't seem to figure out what constraint to use: asm(lds r16, %0: =x (array[element]):); I've tried every constraint for x in the manual, but none of them seem to work. Is there a newer version of the inline assembly manual that I haven't found? The one I'm using is: http://www.nongnu.org/avr-libc/user-manual/inline_asm.html Any help would be appreciated. Thanks ___ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
Re: [avr-gcc-list] Array element in inline assembly
Matt McLellan [EMAIL PROTECTED] wrote: asm(lds r16, array[element]::); That gives me the following error: Error: garbage at end of file Sure, assembler is not C. ;-) You'd need to compute the address yourself in assembler. I've also tried passing it as an arguement, but can't seem to figure out what constraint to use: asm(lds r16, %0: =x (array[element]):); lds is probably the wrong operation to try. If you want the compiler to do the address calculation on your behalf, rather let it pass you the fetched value in a register. p.s.: This is supposed to be a closed list, so without a subscription, you risk missing answers. -- cheers, Jorg .-.-. --... ...-- -.. . DL8DTL http://www.sax.de/~joerg/NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-) ___ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
