Hi,

I'm using the LPC2378 on a design where low power consumption is very important. We put the MCU (LPC2378) into power down mode and we expect it will wake up from power down if RTC, USB or GPIO interrupt occurs.
The RTC and USB interrupts work fine. I also tested that the EXT interrupts (EINT0) work ok.
I can't however configure the device to wake up from power down when a GPIO interrupt occurs.
I'm using the following configuration (example for P0.2):
/* P0.2 */
PINSEL0 &= ~(0x3 << 4); /* Pin function: GPIO */
PINMODE0 &= ~(0x3 << 4); /* Pin mode: on-chip pull-up resistor. */
IO0DIR &= ~(0x1 << 2); /* Pin direction: input. */
IO0_INT_EN_F |= (0x1 << 2); /* Enable falling edge IRQ. */
IO0_INT_EN_R |= (0x1 << 2); /* Enable rising edge IRQ. */

INTWAKE = 0x0080; /* Bit 7, Activity on GPIO pins wakes up MCU. */
PCON = 0x1C | 0x02; /* Disable BOD and enter power down mode. */

I configured a pin in port 2 in a similar way but it didn't work either.

I'll appreciate your help.

Thanks in advance,
Zbigniew Start a New Thread

Z...@s3group.com napisa:
>Hi,
>
>I'm using the LPC2378 on a design where low power consumption is very important. We put the MCU (LPC2378) into power down mode and we expect it will wake up from power down if RTC, USB or GPIO interrupt occurs.
>The RTC and USB interrupts work fine. I also tested that the EXT interrupts (EINT0) work ok.
>I can't however configure the device to wake up from power down when a GPIO interrupt occurs.
>I'm using the following configuration (example for P0.2):
>/* P0.2 */
>PINSEL0 &= ~(0x3 << 4); /* Pin function: GPIO */
>PINMODE0 &= ~(0x3 << 4); /* Pin mode: on-chip pull-up resistor. */
>IO0DIR &= ~(0x1 << 2); /* Pin direction: input. */
>IO0_INT_EN_F |= (0x1 << 2); /* Enable falling edge IRQ. */
>IO0_INT_EN_R |= (0x1 << 2); /* Enable rising edge IRQ. */
>
>INTWAKE = 0x0080; /* Bit 7, Activity on GPIO pins wakes up MCU. */
>PCON = 0x1C | 0x02; /* Disable BOD and enter power down mode. */
>
>I configured a pin in port 2 in a similar way but it didn't work either.
>
>I'll appreciate your help.

As I understanding UM it is not passible.
See:

UM10211
page 4:
• Processor wakeup from Power Down mode via any interrupt able to operate during
Power Down mode (includes external interrupts, RTC interrupt, and Ethernet wakeup
interrupt).

No GPIO ;-(

And see chapter 3 page 23 Fig. 8

Albert





Start a New Thread

> a...@vp.pl napisa:
> >Z...@s3group.com napisa:
> >>Hi,
> >>
> >>I'm using the LPC2378 on a design where low power consumption is very
> important. We put the MCU (LPC2378) into power down mode and we expect it
> will wake up from power down if RTC, USB or GPIO interrupt occurs.
> >>The RTC and USB interrupts work fine. I also tested that the EXT
> interrupts (EINT0) work ok.
> >>I can't however configure the device to wake up from power down when a
> GPIO interrupt occurs.
> >>I'm using the following configuration (example for P0.2):
> >>/* P0.2 */
> >>PINSEL0 &= ~(0x3 << 4); /* Pin function: GPIO */
> >>PINMODE0 &= ~(0x3 << 4); /* Pin mode: on-chip pull-up resistor. */
> >>IO0DIR &= ~(0x1 << 2); /* Pin direction: input. */
> >>IO0_INT_EN_F |= (0x1 << 2); /* Enable falling edge IRQ. */
> >>IO0_INT_EN_R |= (0x1 << 2); /* Enable rising edge IRQ. */
> >>
> >>INTWAKE = 0x0080; /* Bit 7, Activity on GPIO pins wakes up MCU.
> */
> >>PCON = 0x1C | 0x02; /* Disable BOD and enter power down mode. */
> >>
> >>I configured a pin in port 2 in a similar way but it didn't work either.
> >>
> >>I'll appreciate your help.
> >
> >As I understanding UM it is not passible.
>
> I was blind ;-)
> You must use EINT3 to configure GPIO wakeup.
>
> See :
> http://www.standardics.nxp.com/support/documents/microcontrollers/zip/code
> .bundle.lpc23xx.lpc24xx.uvision.zip
> File pwrman.c
>
> Albert Bartoszko
>
Hi Albert,

Thanks for referencing me to the sample code. It turned out that the UM specifies the bit 8 in the INTWAKE register as reserve while in fact it should be set so a GPIO interrupt could wake up the MCU from power down.
Again, thanks a lot,
Zbigniew

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