possible wake up sources from standby?

kmh

Prodigy 20 points

Hello team,

what are the possible wake up sources from standby mode? We are a little bit confused from TecRefManual Spruh73f:

8.1.4.5 Wakeup Sources/Events

Following events will wake up the device from Deep sleep(low power) modes. These are part of the

Wakeup Power domain and remain always ON.

• GPIO0 bank

• dmtimer1_1ms (timer based wakeup)

• USB2PHY (USB resume signaling from suspend) – Both USB ports supported.

• TSC (touch screen controller, ADC monitor functions )

• UART0 (Infra-red support)

• I2C0

These wake events apply on any of the deep sleep modes and standby mode.

so this are possible wake up sources

8.1.4.6.2 Sleep Sequencing

6. Any peripheral interrupt will trigger a wake interrupt to CortexM3 via Cortex A8 MPU’s WKUP signal

(INTR2 shown on the diagram).

so any peripherial interrupt can be used to wake up from standby

25.1.3 Unsupported GPIO Features

The wake-up feature of the GPIO modules is only supported on GPIO0.

so only GPIO0 ports are able to wake up

From test we know that e.g. GPIO1.28 is able to wake up system from standby.

Can anybody provide clarification on which peripherial are able to wake up from standby?

over 12 years ago

0 Biser Gatchev-XID over 12 years ago

TI__Guru**** 393215 points

Hi Klaus,

Here you can find more information: http://processors.wiki.ti.com/index.php/AM335x_Power_Management_Standby_User%27s_Guide

0 zzw over 12 years ago in reply to Biser Gatchev-XID

Prodigy 120 points

hi,Klaus:

how I can set gpio0 wake up in linux, I do that this:

         static struct gpio_keys_button lcd_cape_gpio_buttons[] = {
   {
       .code                   = KEY_BACK,
       .gpio                   = GPIO_TO_PIN(0, 16),
       .active_low             = true,
       .desc                   = "back",
       .type                   = EV_KEY,
       .wakeup                 = 1,
   },
   {
       .code                   = KEY_MENU,
       .gpio                   = GPIO_TO_PIN(0, 17),
       .active_low             = true,
       .desc                   = "menu",
       .type                   = EV_KEY,
       .wakeup                 = 1,
   },
   {
       .code                   = KEY_POWER,
       .gpio                   = GPIO_TO_PIN(0, 31),
       .active_low             = true,
       .desc                   = "power",
       .type                   = EV_KEY,
       .wakeup                 = 1,
   },
};

but I can't wake up from these KEY, pls give me more info.

other question, as I know we should set register to configure wake up function,which file in linux bsp do this work?

0 Sandhya Satyanarayana over 12 years ago in reply to zzw

TI__Intellectual 1165 points

Hi,

I suppose you want to wakeup from standby through gpio0.

Please refer the wiki page below for the kernel and CM3 firmware versions to be used for standby support on AM335x.

http://processors.wiki.ti.com/index.php/AM335x_Power_Management_Standby_User%27s_Guide

In standby, wakeup is possible via any peripheral interrupt (any activity on gpio0 key that can generate an interrupt ) to Cortex-A8.

Regards

Sandhya

0 Dav01 over 12 years ago in reply to Sandhya Satyanarayana

Expert 2300 points

Follow up question. In the datasheet it reads "Up to Two Interrupt Inputs per Bank.", does this mean that only 2 GPIO's (of BANK0) can be used to wake from deepsleep0?

Or can any number of pins be used to trigger a wakeup and later be read to know where it came from?

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possible wake up sources from standby?