arm926ejs simple interrupts

Hello everyone,

I'm a student, trying to move up from programming PIC micros to
working with ARM microcontrollers.

At the moment I have a lot of problems with the whole concept of
interrupts in ARM. Could someone tell me where I could find a simple
hello world like application that would have only the interrupt on
timer0 or something like that.

Thanks in advance,
Jani Start a New Thread

Hi Jani,

There are lots of examples in the atmel's corresponding web-site:
http://www.atmel.com/dyn/products/tools_card.asp?family_id`5&family_name=AT91SAM+32%2Dbit+ARM%2Dbased+Microcontrollers&tool_id933
You can download the complete cd.

For the sake of simplicity, I have uploaded to rapidshare an example that covers interrupts with timers
http://rapidshare.com/files/97662092/AT91SAM9260-Interrupt.zip.html

Good luck..

Mit freundlichem Gru/ Best regards

Bekir ICLI

________________________________

Von: A... [mailto:A...] Im Auftrag von kumori0
Gesendet: Donnerstag, 6. Mz 2008 21:36
An: A...
Betreff: [AT91SAM] arm926ejs simple interrupts

Hello everyone,

I'm a student, trying to move up from programming PIC micros to
working with ARM microcontrollers.

At the moment I have a lot of problems with the whole concept of
interrupts in ARM. Could someone tell me where I could find a simple
hello world like application that would have only the interrupt on
timer0 or something like that.

Thanks in advance,
Jani Start a New Thread

Google "building bare metal arm systems with GNU" to find a 10 part tutorial
that I found useful.

Steve
On Thu, Mar 6, 2008 at 10:14 PM, ICLI, Bekir (EXT) <
b...@siemens.com> wrote:

> Hi Jani,
>
> There are lots of examples in the atmel's corresponding web-site:
>
> http://www.atmel.com/dyn/products/tools_card.asp?family_id`5&family_name=AT91SAM+32%2Dbit+ARM%2Dbased+Microcontrollers&tool_id933
> You can download the complete cd.
>
> For the sake of simplicity, I have uploaded to rapidshare an example that
> covers interrupts with timers
> http://rapidshare.com/files/97662092/AT91SAM9260-Interrupt.zip.html
>
> Good luck..
>
> Mit freundlichem Gru/ Best regards
>
> Bekir ICLI
>
> ------------------------------
> *Von:* A... [mailto:A...] *Im
> Auftrag von *kumori0
> *Gesendet:* Donnerstag, 6. Mz 2008 21:36
> *An:* A...
> *Betreff:* [AT91SAM] arm926ejs simple interrupts
>
> Hello everyone,
>
> I'm a student, trying to move up from programming PIC micros to
> working with ARM microcontrollers.
>
> At the moment I have a lot of problems with the whole concept of
> interrupts in ARM. Could someone tell me where I could find a simple
> hello world like application that would have only the interrupt on
> timer0 or something like that.
>
> Thanks in advance,
> Jani
>
>
>

--
******************************
Steve Manion
S...@Metrozet.com
(626) 507-8025
(626) 437-6905

WWW.METROZET.COM
****************************** Start a New Thread

And if you want to dig a little deeper...
http://www.micrium.com/support/application_notes.html#AN1

--- In A..., "ICLI, Bekir (EXT)"
wrote:
>
> Hi Jani,
>
> There are lots of examples in the atmel's corresponding web-site:
> http://www.atmel.com/dyn/products/tools_card.asp?
family_id=605&family_name=AT91SAM+32%2Dbit+ARM%
2Dbased+Microcontrollers&tool_id=3933
> You can download the complete cd.
>
> For the sake of simplicity, I have uploaded to rapidshare an
example that covers interrupts with timers
> http://rapidshare.com/files/97662092/AT91SAM9260-Interrupt.zip.html

>
> Good luck..
>
> Mit freundlichem Gru/ Best regards
>
> Bekir ICLI
>
>
>
> ________________________________
>
> Von: A... [mailto:A...] Im
Auftrag von kumori0
> Gesendet: Donnerstag, 6. Mz 2008 21:36
> An: A...
> Betreff: [AT91SAM] arm926ejs simple interrupts
>
>
>
> Hello everyone,
>
> I'm a student, trying to move up from programming PIC micros to
> working with ARM microcontrollers.
>
> At the moment I have a lot of problems with the whole concept of
> interrupts in ARM. Could someone tell me where I could find a simple
> hello world like application that would have only the interrupt on
> timer0 or something like that.
>
> Thanks in advance,
> Jani
>



Start a New Thread

Thanks everyone,

I will try and digest all those links and examples today. Would do it
sooner but was at CEBIT...

Jani

--- In A..., "willoughby_jon"
wrote:
>
> And if you want to dig a little deeper...
> http://www.micrium.com/support/application_notes.html#AN1
>
> --- In A..., "ICLI, Bekir (EXT)"
> wrote:
> >
> > Hi Jani,
> >
> > There are lots of examples in the atmel's corresponding web-site:
> > http://www.atmel.com/dyn/products/tools_card.asp?
> family_id=605&family_name=AT91SAM+32%2Dbit+ARM%
> 2Dbased+Microcontrollers&tool_id=3933
> > You can download the complete cd.
> >
> > For the sake of simplicity, I have uploaded to rapidshare an
> example that covers interrupts with timers
> > http://rapidshare.com/files/97662092/AT91SAM9260-Interrupt.zip.html
>
> >
> > Good luck..
> >
> > Mit freundlichem Gru/ Best regards
> >
> > Bekir ICLI
> >
> >
> >
> > ________________________________
> >
> > Von: A... [mailto:A...] Im
> Auftrag von kumori0
> > Gesendet: Donnerstag, 6. Mz 2008 21:36
> > An: A...
> > Betreff: [AT91SAM] arm926ejs simple interrupts
> >
> >
> >
> > Hello everyone,
> >
> > I'm a student, trying to move up from programming PIC micros to
> > working with ARM microcontrollers.
> >
> > At the moment I have a lot of problems with the whole concept of
> > interrupts in ARM. Could someone tell me where I could find a simple
> > hello world like application that would have only the interrupt on
> > timer0 or something like that.
> >
> > Thanks in advance,
> > Jani
>



Start a New Thread

Hi Jani,

It is most probably set in the cstartup assembly code..
As an example:

msr CPSR_c, #ARM_MODE_SYS

sets the CPSR to supervisor mode.

if you write:
msr CPSR_c, #ARM_MODE_SYS | I_BIT | F_BIT
Where
#define I_BIT 0x80
#define F_BIT 0x40
is, than you set your CPSR to supervisor mode, with interrupts (both) disabled.

Look for msr commands in your code..

Mit freundlichem Gru/ Best regards
Bekir ICLI

________________________________

Von: A... [mailto:A...] Im Auftrag von kumori0
Gesendet: Freitag, 4. April 2008 11:01
An: A...
Betreff: [AT91SAM] Re: arm926ejs simple interrupts

Thanks, this should be the problem. I now have one very newbie
question. How do I change the CPSR value in code? I can't find the
memory location for it in AT91SAM9260 definitions where the memory
addresses are. Do I have to use some assembly command?

Jani

--- In A... , "ICLI, Bekir (EXT)"
wrote:
>
> Hi Jani,
>
> Looking at your CPSR, you are masking I and F (bits 6-7) bits. That
means, both fiq and irq interrupts are masked..
> Mit freundlichem Gru/ Best regards
> Bekir ICLI
> ________________________________
>
> Von: A... [mailto:A... ] Im
Auftrag von kumori0
> Gesendet: Freitag, 4. April 2008 10:31
> An: A...
> Betreff: [AT91SAM] Re: arm926ejs simple interrupts
>
> Hello everyone,
>
> I'm still trying to get the interrupts working. I have implemented the
> code from the examples that I got but so far they're still not working.
>
> When I check the registers with jtag I can see that there is an
> interrupt pending (return (pAic->AIC_IPR & (0x1 << irq_id));) but for
> some reason the active interrupt (return (pAic->AIC_ISR & (0x1 <<
> irq_id));) is always 0.
>
> When I look at the interrupt mask, to see which interrupts are enabled
> I can see that the PIT interrupt and the software interrupt are
> enabled (SYS value of AIC_IMR=1).
>
> I also tried to trigge the interrupts manually by writing 1 in
> AIC_ISCR but nothing happens.
>
> You can see my source code here:
> aic.c - http://pastebin.com/m61920f16 >
> aic.h - http://pastebin.com/m2653e9ef >
> main.c - http://pastebin.com/m51a7958b >
> main.h - http://pastebin.com/m63a31dd0 >
> pit.c - http://pastebin.com/m13cd9e02 >
> pit.h - http://pastebin.com/m54f75450 >
> CS1275.c(hw init) - http://pastebin.com/m2fe34e30
> The value of my CPSR is: 00100000 00000000 00000000 11010011
>
> I'm runing my code through debugger, does that disable interrupts?
>
> Let me know if more info about configuration and/or source code is
> needed.
>
> Thanks in advance,
> Jani
> Start a New Thread

For the IAR compiler there is an intrisic function
__enable_interrupt();
For all interrupts. You can also set fiq and irq separately with
something like
__enable_irq()
__enable_fiq()
There are of course corresponding __disable commands
Hope this helps.
/johan

kumori0 skrev:
> Thanks, this should be the problem. I now have one very newbie
> question. How do I change the CPSR value in code? I can't find the
> memory location for it in AT91SAM9260 definitions where the memory
> addresses are. Do I have to use some assembly command?
>
> Jani
>
> --- In A... ,
> "ICLI, Bekir (EXT)"
> wrote:
> >
> > Hi Jani,
> >
> > Looking at your CPSR, you are masking I and F (bits 6-7) bits. That
> means, both fiq and irq interrupts are masked..
> >
> >
> > Mit freundlichem Gru/ Best regards
> > Bekir ICLI
> >
> >
> >
> >
> > ________________________________
> >
> > Von: A...
> [mailto:A... ] Im
> Auftrag von kumori0
> > Gesendet: Freitag, 4. April 2008 10:31
> > An: A...
> > Betreff: [AT91SAM] Re: arm926ejs simple interrupts
> >
> >
> >
> > Hello everyone,
> >
> > I'm still trying to get the interrupts working. I have implemented the
> > code from the examples that I got but so far they're still not working.
> >
> > When I check the registers with jtag I can see that there is an
> > interrupt pending (return (pAic->AIC_IPR & (0x1 << irq_id));) but for
> > some reason the active interrupt (return (pAic->AIC_ISR & (0x1 <<
> > irq_id));) is always 0.
> >
> > When I look at the interrupt mask, to see which interrupts are enabled
> > I can see that the PIT interrupt and the software interrupt are
> > enabled (SYS value of AIC_IMR=1).
> >
> > I also tried to trigge the interrupts manually by writing 1 in
> > AIC_ISCR but nothing happens.
> >
> > You can see my source code here:
> > aic.c - http://pastebin.com/m61920f16
> >
> > aic.h - http://pastebin.com/m2653e9ef
> >
> > main.c - http://pastebin.com/m51a7958b
> > >
> > main.h - http://pastebin.com/m63a31dd0
> > >
> > pit.c - http://pastebin.com/m13cd9e02
> >
> > pit.h - http://pastebin.com/m54f75450
> >
> > CS1275.c(hw init) - http://pastebin.com/m2fe34e30
>
> >
> >
> > The value of my CPSR is: 00100000 00000000 00000000 11010011
> >
> > I'm runing my code through debugger, does that disable interrupts?
> >
> > Let me know if more info about configuration and/or source code is
> > needed.
> >
> > Thanks in advance,
> > Jani
> >

--
Johan Ingvast, PhD, CEO BioServo Technologies AB
Mob. +46 70 34 34 498 http://www.bioservo.com
Pub. pgp sign.: http://www.md.kth.se/~ingvast/Ingvast_public_key.asc

Start a New Thread

Hello everyone,

I'm still trying to get the interrupts working. I have implemented the
code from the examples that I got but so far they're still not working.

When I check the registers with jtag I can see that there is an
interrupt pending (return (pAic->AIC_IPR & (0x1 << irq_id));) but for
some reason the active interrupt (return (pAic->AIC_ISR & (0x1 <<
irq_id));) is always 0.

When I look at the interrupt mask, to see which interrupts are enabled
I can see that the PIT interrupt and the software interrupt are
enabled (SYS value of AIC_IMR=1).

I also tried to trigge the interrupts manually by writing 1 in
AIC_ISCR but nothing happens.

You can see my source code here:
aic.c - http://pastebin.com/m61920f16
aic.h - http://pastebin.com/m2653e9ef
main.c - http://pastebin.com/m51a7958b
main.h - http://pastebin.com/m63a31dd0
pit.c - http://pastebin.com/m13cd9e02
pit.h - http://pastebin.com/m54f75450
CS1275.c(hw init) - http://pastebin.com/m2fe34e30

The value of my CPSR is: 00100000 00000000 00000000 11010011

I'm runing my code through debugger, does that disable interrupts?

Let me know if more info about configuration and/or source code is
needed.

Thanks in advance,
Jani
Start a New Thread

Thank you,

That helped a lot. I looked but I didn't look hard enough it seems.
I'm still trying to understand everything in C, I planed to learn more
about assembly after I can get the thing workng in c, because it
should be easier that way.

Does anyone know what

void ARM_reset(void);
void ARM_undef(void);
void ARM_swi(void);
void ARM_pAbort(void);
void ARM_dAbort(void);
void ARM_reserved(void);
void ARM_irq(void);
void ARM_fiq(void);

are for?

Jani

--- In A..., 42Bastian wrote:
>
> kumori0 schrieb:
> > I'm afraid I don't have IAR compiler, I'm using gcc, after Lynch's
> > tutorial. I have located the macros that should enable and disable the
> > interrupts in my hello world example, but I can't figure out what
> > exactly do they do.
>
> Did you look at the ARM assembly syntax ?
>
> The macros just copy the CPSR into key lock interrupts (and change to
> SYS-mode) or key into CPSR.
>
> --
> 42Bastian
>
> Note: SPAM-only account, direct mail to bs42@
>

Start a New Thread

Hi Jani,

They are the exception vector handlers, as it seems.
When there is, for example, a prefetch abort exception, the pc is loaded with the address 0xC.
And you probably have a branch to your ARM_pAbort() function at that address..

Mit freundlichem Gru/ Best regards
Bekir ICLI

________________________________

Von: A... [mailto:A...] Im Auftrag von kumori0
Gesendet: Dienstag, 8. April 2008 11:34
An: A...
Betreff: [AT91SAM] Re: arm926ejs simple interrupts

Thank you,

That helped a lot. I looked but I didn't look hard enough it seems.
I'm still trying to understand everything in C, I planed to learn more
about assembly after I can get the thing workng in c, because it
should be easier that way.

Does anyone know what

void ARM_reset(void);
void ARM_undef(void);
void ARM_swi(void);
void ARM_pAbort(void);
void ARM_dAbort(void);
void ARM_reserved(void);
void ARM_irq(void);
void ARM_fiq(void);

are for?

Jani

--- In A... , 42Bastian wrote:
>
> kumori0 schrieb:
> > I'm afraid I don't have IAR compiler, I'm using gcc, after Lynch's
> > tutorial. I have located the macros that should enable and disable the
> > interrupts in my hello world example, but I can't figure out what
> > exactly do they do.
>
> Did you look at the ARM assembly syntax ?
>
> The macros just copy the CPSR into key lock interrupts (and change to
> SYS-mode) or key into CPSR.
>
> --
> 42Bastian
>
> Note: SPAM-only account, direct mail to bs42@
> Start a New Thread