Lpc2000

When I set up an external edge sensitive interrupt EINT3 on an 
lpc2129 all sorts of problems happen. The jtag stops working and 
won't work again until I reprogram through the ISP.

The pin is sitting stable at about 2.8 volts when I run the following 
code. If I set up for level sensitive it is ok.

// initialise pin 0.30 (EINT3) to have a negative edge 
// triggered interrupt

PINSEL1_bit.P0_30=0x2; 
EXTMODE = 0x08;

// enable the interrupt control	
VICIntSelect &= ~(1<<VIC_EINT3);  // IRQ on external interrupt
VICVectAddr3 = (uint32_t)&ShutdownRamInterrupt;
VICVectCntl3 = 0x20 | VIC_EINT3; // vector interrupt for external 3
VICIntEnable = (1<<VIC_EINT3);    // Enable external 3 interrupt.
		
Anybody used EINT3 edge sensitive on an lpc2129

thanks Doug

Are u using IAR? I had to modify the header file I got (iolpc2129.h) 
because apparently the EINT3 channel wasn't defined.

Well assuming that you're using channel 17 for EINT3... 

#define VIC_EINT3       17

...the code looks ok. 


Otherwise try clearing the EINT3 flag before enabling the interrupt 
and let me know what happens.

Leighton



--- In lpc2000@yahoogroups.com, "douglasbolton" <doug@c...> wrote:
> When I set up an external edge sensitive interrupt EINT3 on an 
> lpc2129 all sorts of problems happen. The jtag stops working and 
> won't work again until I reprogram through the ISP.
> 
> The pin is sitting stable at about 2.8 volts when I run the 
following 

> code. If I set up for level sensitive it is ok.
> 
> // initialise pin 0.30 (EINT3) to have a negative edge 
> // triggered interrupt
> 
> PINSEL1_bit.P0_30=0x2; 
> EXTMODE = 0x08;
> 
> // enable the interrupt control	
> VICIntSelect &= ~(1<<VIC_EINT3);  // IRQ on external interrupt
> VICVectAddr3 = (uint32_t)&ShutdownRamInterrupt;
> VICVectCntl3 = 0x20 | VIC_EINT3; // vector interrupt for external 3
> VICIntEnable = (1<<VIC_EINT3);    // Enable external 3 interrupt.
> 		
> Anybody used EINT3 edge sensitive on an lpc2129
> 
> thanks Doug

--- In lpc2000@yahoogroups.com, "Leighton Rowe" <leightonsrowe@y...> 
wrote:
> Are u using IAR? I had to modify the header file I got 
(iolpc2129.h) 
> because apparently the EINT3 channel wasn't defined.
> 
> Well assuming that you're using channel 17 for EINT3... 
> 
> #define VIC_EINT3       17
> 
> ...the code looks ok. 
> 
> 
> Otherwise try clearing the EINT3 flag before enabling the interrupt 
> and let me know what happens.
> 
> Leighton
> 
> 
> 
> --- In lpc2000@yahoogroups.com, "douglasbolton" <doug@c...> wrote:
> > When I set up an external edge sensitive interrupt EINT3 on an 
> > lpc2129 all sorts of problems happen. The jtag stops working and 
> > won't work again until I reprogram through the ISP.
> > 
> > The pin is sitting stable at about 2.8 volts when I run the 
> following 
> > code. If I set up for level sensitive it is ok.
> > 
> > // initialise pin 0.30 (EINT3) to have a negative edge 
> > // triggered interrupt
> > 
> > PINSEL1_bit.P0_30=0x2; 
> > EXTMODE = 0x08;
> > 
> > // enable the interrupt control	
> > VICIntSelect &= ~(1<<VIC_EINT3);  // IRQ on external interrupt
> > VICVectAddr3 = (uint32_t)&ShutdownRamInterrupt;
> > VICVectCntl3 = 0x20 | VIC_EINT3; // vector interrupt for external 
3
> > VICIntEnable = (1<<VIC_EINT3);    // Enable external 3 interrupt.
> > 		
> > Anybody used EINT3 edge sensitive on an lpc2129
> > 
> > thanks Doug



Thanks Leighton but I'd already modified my IAR header file for the 
lpc2129.

Clearing the interrupt before the EXTMODE = 0x08 command did not do 
anything either.

The external interrupt works fine in level sensitive mode, but as 
soon as I write the EXTMODE register with 0x08 to enable level 
sensitive mode on interrupt 3 the processor goes into deep space. 

The EXTMODE register I'm writing is at 0xE01FC148 which agrees with 
the manual.

Something is going very wrong with the processor since I have to 
reprogram the flash with the ISP to get it working again. No matter 
what I do the JTAG is finished.

I've now got it down to any write to the EXTMODE register causes the 
processor to fail.

Even writing the reset value of 0x0 to it causes a problem. Below is 
the IAR assembler used to write the register with 0x0. I can't see 
anything wrong with this. However as soon as the register is written, 
see you later from the processor.

//  273 	EXTMODE = 0x0;		
   LDR         R3,??LPC210xInitExtIntPin_0+8  ;; 0xe01fc148
   MOV         R1,#+0x0
   STR         R1,[R3, #+0]


Has anybody else out there accessed the EXTMODE register on an 
lpc2129??

Hey Doug,

I meant clearing the flags after setting EXTMODE as
suggested on pg.68.

EXTMODE = 0x08; //only controls the sensitivity
EXTINT = 0x08;  //clear EINT3 flag
...
...
VICIntEnable = (1<<VIC_EINT3);    // Enable external 3
interrupt.

Your 2nd reply (which just came) looks kinda spooky.
What kind-off exception r u getting? If EINT0-2 can
work on edge sensitive mode, then I wouldn't give up
on EINT3 quite yet. There's must be a way to get
around to it.

Good luck,
Leighton



		
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--- In lpc2000@yahoogroups.com, Leighton Rowe <leightonsrowe@y...> 
wrote:
> Hey Doug,
> 
> I meant clearing the flags after setting EXTMODE as
> suggested on pg.68.
> 
> EXTMODE = 0x08; //only controls the sensitivity
> EXTINT = 0x08;  //clear EINT3 flag
> ...
> ...
> VICIntEnable = (1<<VIC_EINT3);    // Enable external 3
> interrupt.
> 
> Your 2nd reply (which just came) looks kinda spooky.
> What kind-off exception r u getting? If EINT0-2 can
> work on edge sensitive mode, then I wouldn't give up
> on EINT3 quite yet. There's must be a way to get
> around to it.
> 
> Good luck,
> Leighton


Leighton

I've tried all of the above and even tried another board with no luck.

As soon as I write EXTMODE to a value the JTAG aborts. If I program 
flash and run the processor hangs.

I'm at a loss to where to go from here. For my current application I 
can run using level sensitive (using reset value of EXTMODE). However 
I would like to know why writing to this register causes such a 
problem.

--- In lpc2000@yahoogroups.com, "douglasbolton" <doug@c...> wrote:
> I've now got it down to any write to the EXTMODE register causes 
the 
> processor to fail.
> 
> Even writing the reset value of 0x0 to it causes a problem. Below 
is 
> the IAR assembler used to write the register with 0x0. I can't see 
> anything wrong with this. However as soon as the register is 
written, 
> see you later from the processor.
> 
> //  273 	EXTMODE = 0x0;		
>    LDR         R3,??LPC210xInitExtIntPin_0+8  ;; 0xe01fc148
>    MOV         R1,#+0x0
>    STR         R1,[R3, #+0]
> 
> 
> Has anybody else out there accessed the EXTMODE register on an 
> lpc2129??

The errata sheet mentions an issue with writing to EXTPOLAR or 
EXTMODE.

Karl Olsen

--- In lpc2000@yahoogroups.com, "Karl Olsen" <kro@p...> wrote:
> --- In lpc2000@yahoogroups.com, "douglasbolton" <doug@c...> wrote:
> > I've now got it down to any write to the EXTMODE register causes 
> the 
> > processor to fail.
> > 
> > Even writing the reset value of 0x0 to it causes a problem. Below 
> is 
> > the IAR assembler used to write the register with 0x0. I can't 
see 
> > anything wrong with this. However as soon as the register is 
> written, 
> > see you later from the processor.
> > 
> > //  273 	EXTMODE = 0x0;		
> >    LDR         R3,??LPC210xInitExtIntPin_0+8  ;; 0xe01fc148
> >    MOV         R1,#+0x0
> >    STR         R1,[R3, #+0]
> > 
> > 
> > Has anybody else out there accessed the EXTMODE register on an 
> > lpc2129??
> 
> The errata sheet mentions an issue with writing to EXTPOLAR or 
> EXTMODE.
> 
> Karl Olsen


Thank you Karl. I hadn't read the the errata for a while and missed 
that one. 

Anybody else using edge sensitive interrupts should note -

Make sure you do actually write 0x0 to VPBDIV before actually writing 
to EXTMODE. If you just write to EXTMODE at reset when VPBDIV is 0x0 
there still is a problem.