Wake from suspend on UART activity?

ianscriven · **Joined:** Wed Nov 25, 2009 4:15 am **Posts:** 18

Hi,

Is there any reason why I can't wake WinCE (6.0) from suspend when UART activity occurs? Can I assign a sys interrupt to the RXD pin of the uart? This is how the KeyPad driver achieves this, isn't it?

Thanks,
Ian

Adeneo · **Posted:** Tue Jun 22, 2010 1:53 pm

Hi ianscriven,

You can't wake-up your platform directly with the RxD pin.
We have never tried to wake-up a board with a serial COM port but that is theoretically possible.
You can try to call KernelIoControl with IOCTL_HAL_ENABLE_WAKE and the SysIntr that correspond to the interrupt of your serial port.

HTH

If this answer solves your problem, please edit the subject of this post by adding [Solved] at the beginning of the subject.

ianscriven · **Joined:** Wed Nov 25, 2009 4:15 am **Posts:** 18

Thanks for the reply. I've added some code to the serial driver (Serial_SAM926X) to (hopefully) do this:

Code:

   ///---------------------------------------------------------------------------------
   /// Interrupt Init

   // Request sysintr for the device
   pSerialInitStructure->dwSysIntr = SYSINTR_UNDEFINED;
   if (!KernelIoControl(IOCTL_HAL_REQUEST_SYSINTR, (PVOID)&pSerialInitStructure->dwDeviceID, sizeof(pSerialInitStructure->dwDeviceID), (PVOID)&pSerialInitStructure->dwSysIntr, sizeof(pSerialInitStructure->dwSysIntr), NULL))
   {
      RETAILMSG(1, (TEXT("ERROR: Failed to request the serial sysintr for USART XX.\r\n")));
      pSerialInitStructure->dwSysIntr = SYSINTR_UNDEFINED;
      goto error;
   }
   
   // new code to enable wake on serial?
   if(!KernelIoControl(IOCTL_HAL_ENABLE_WAKE, (PVOID)&pSerialInitStructure->dwSysIntr   , sizeof(pSerialInitStructure->dwSysIntr)  , &dwResult   , sizeof(dwResult   ), 0))
   {
      RETAILMSG(1, (TEXT("IOCTL_HAL_ENABLE_WAKE failed\n\r")));
   }

This doesn't work - I'm guessing the UART is turned off when the device suspends, preventing the interrupt from being generated? If so, how can I make sure it is left enabled? I'm using USART0, so the tx/rx pins are on PIOA, which, according to this line from BSPPowerOff, should still be active?

Code:

pPMC->PMC_PCDR = ~((1 << AT91C_ID_PIOCDE) | (1 << AT91C_ID_PIOA) | (1 << AT91C_ID_AC97C) | (1 << AT91C_ID_2DGE) | (1 << AT91C_ID_EMAC));      //0xFF5BFFEB

Anyone have any ideas?

ianscriven · **Joined:** Wed Nov 25, 2009 4:15 am **Posts:** 18

Further update:

I've edited the BSPPowerOff function to keep the peripheral clock for USART0 enabled. When the system suspends, I get the message

Code:

OALPowerWakeSource enable 14

on debug rs232 - the interrupt for USART0 is 20 - it seems the USART interrupt isn't being configured as a wakeup source... what am I doing wrong?

Adeneo · **Posted:** Wed Jun 23, 2010 1:21 pm

Hi ianscriven,

To keep the clock of the Uart0, you must add (1 << AT91C_ID_US0) to your code

Code:

pPMC->PMC_PCDR = ~(
   (1 << AT91C_ID_PIOCDE) | 
   (1 << AT91C_ID_PIOA) | 
   (1 << AT91C_ID_AC97C) | 
   (1 << AT91C_ID_2DGE) | 
   (1 << AT91C_ID_EMAC) |
   (1 << AT91C_ID_US0)
);

HTH

If this answer solves your problem, please edit the subject of this post by adding [Solved] at the beginning of the subject.

ianscriven · **Joined:** Wed Nov 25, 2009 4:15 am **Posts:** 18

ianscriven wrote:

Further update:
When the system suspends, I get the message

Code:

OALPowerWakeSource enable 14

on debug rs232 - the interrupt for USART0 is 20...

Never mind this... 20d is 14h, what was I thinking...

The uart should be enabled, like you say, I have

Code:

pPMC->PMC_PCDR = ~((1 << AT91C_ID_PIOCDE) | (1 << AT91C_ID_PIOA) | (1 << AT91C_ID_AC97C) | (1 << AT91C_ID_2DGE) | (1 << AT91C_ID_EMAC) | (1 << AT91C_ID_US0));

in the BPSPowerOff function. No joy as yet though, I'll keep working on it.

Would it be easier to get WinCE to wake on USB device activity?

Adeneo · **Posted:** Thu Jun 24, 2010 11:16 am

Hi ianscriven,

Have you modified the SOCSaveAndDisableAllIntrBeforeSuspend function located in the WinCE600\PLATFORM\COMMON\SRC\SOC\ATMEL\AT91SAM926x\KERNEL\INTR\intr.c file?
You must keep alive the interrupt for your wakeup source like below (not tested).

Code:

void SOCSaveAndDisableAllIntrBeforeSuspend()
{
   RETAILMSG(1, ( L"+SOCSaveAndDisableAllIntrBeforeSuspend()\r\n" ));    
    AICResumeMask = g_pAIC->AIC_IMR;
   g_pAIC->AIC_IDCR = 0xFFFFFFFF; //mask all the interrupts
   SOCPioSaveAndDisableAllIntrBeforeSuspend();
   SOCPioControllerIntrEnable(); //Leave the interrupt for the pio controllers !
   g_pAIC->AIC_IECR = 1 << AT91C_ID_US0; //unmask UART0 interrupt
}

HTH

If this answer solves your problem, please edit the subject of this post by adding [Solved] at the beginning of the subject.

Wake from suspend on UART activity?

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