Re: PXA270 - Sleep & Wake
- From: pietdesomere@xxxxxxxxx (Piet)
- Date: 2 May 2005 05:18:42 -0700
Has GPIO 0 been configured as an input in the GPDR register?
P
"Jim Merkle" <jimmerkle@xxxxxxxxxxx> wrote in message news:<eeUlY$QTFHA.3308@xxxxxxxxxxxxxxxxxxxx>...
> I'm having difficulty putting my PXA270 to sleep and then waking it via
> GPIO_0.
> In order to more rapidly test this, I put the following module into my
> loader, which can be invoked as a command:
> No attempt is being made in this example to preserve any specific state,
> conserve power, or preserve SDRAM. Should the processor wake from sleep,
> the loader will display the reset cause and the values of the PSSR and RCSR
> registers.
>
> // Prototype assembly function that pokes R0 into CP14, register 7
> extern "C" void WritePWRMODE(DWORD dwSleepMode);
> #define PWRMODE_SLEEP 0x00000003 // Value for cp14: Reg7 to induce sleep.
>
> // Perform minimal steps necessary to configure the PXA270 for sleep and
> // wake up from the Philips, then initiate a sleep.
> STATUS CmdSleep(int argc, char * argv[])
> {
> volatile PMRC_REGS * pPmrcRegs = (PMRC_REGS *)PWR_BASE_U_VIRTUAL;
>
> // Configure the state of the GPIO outputs during sleep
> /*
> ; PGSR0: 0 .. 31
> PGSR_nEnCF33V GPIO_13 ; 0: enable 3.3V to User CF card, 1:
> turn off 3.3V
> PGSR_nEnCF50V GPIO_14 ; 0: enable 5.0V to User CF card, 1:
> turn off 5.0V
> PGSR_nEnUtilPwr GPIO_22 ; 0: enable 5V supply, 1: dissable 5V
> supply
> PGSR_FF_nRTS GPIO_27 ; For "normal" RS-232, we want this line
> high, for RS-485, we want this low
>
> ; PGSR1 32 .. 63
> nFFUART_RS422 GPIO_32 ; If we want the RS-232 transceiver
> enabled, raise this line
> PGSR_nPOE GPIO_48
> PGSR_nPWE GPIO_49
> PGSR_nPIOR GPIO_50
> PGSR_nPIOW GPIO_51
> PGSR_nPCE2 GPIO_54
>
> ; PGSR2 64 .. 95
> PGSR_FF_nDTR GPIO_82
> PGSR_nPCE1 GPIO_85 ; another PCMCIA bit
>
> ; PGSR3 96 .. 120
> PGSR_EnCoreLow GPIO_100 ; 1: 1.0V core voltage
> */
> pPmrcRegs->pgsr0 = GPIO_13 | GPIO_14 | GPIO_22 | GPIO_27;
> pPmrcRegs->pgsr1 = GPIO_48 | GPIO_49 | GPIO_50 | GPIO_51 | GPIO_54;
> //pPmrcRegs->pgsr1 = GPIO_32 | GPIO_48 | GPIO_49 | GPIO_50 | GPIO_51 |
> GPIO_54;
> pPmrcRegs->pgsr2 = GPIO_82 | GPIO_85;
> //pPmrcRegs->pgsr3 = GPIO_100;
> pPmrcRegs->pgsr3 = 0;
>
> // Configure the wake-up event
> pPmrcRegs->prer = GPIO_0; // (GPIO_0 rising edge) 0x00000001
> pPmrcRegs->pfer = GPIO_0; // (GPIO_0 falling edge) 0x00000001
> pPmrcRegs->pwer = GPIO_0; // (GPIO_0 event) 0x00000001
>
> // Configure the PCMCIA output drive, 13Mhz oscillator during sleep
> pPmrcRegs->pcfr=0;
>
> // Sleep Configuration register
> // Set Ramp up for power domains, ignore VDD_FAULT, Keep P1 domain
> powered with clocks running
> //pPmrcRegs->pslr = BIT_31|BIT_30|BIT_27|BIT_26|BIT_22|BIT_3;
> pPmrcRegs->pslr = 0xCC400008;
>
> printf("CmdSleep: Going to sleep...\r\n");
>
> // Wait for the last character in the above line to get out
> msWait(1); // wait one millisecond
>
> WritePWRMODE(PWRMODE_SLEEP); // Initate SLEEP (0x03 - regular sleep)
>
> // Do not return!!!
> while(1);
>
> return STATUS_SUCCESS;
> } // CmdSleep
>
> The processor appears to be sleeping peacefully, but it refuses to wake when
> pulsed on GPIO_0. I can tell the processor has entered sleep since the
> settings in PGSRx have taken effect, driving each of the GPIOs to its
> requested state. (There's still the possibility we have a hardware
> problem...)
>
> Any ideas?
>
> Thank you,
>
> Jim Merkle
.
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