am335x starter kit dev board, how to wake up from "dmtimer 1ms"?

cahide sen

I am using dmtimer project inside the starterware and my target is am335x starter kit.

so far i haven't found a way to eliminate the dependency on UART0 initialization so that 1ms timer interrupt would work.

this makes me think that the wakeup source is UART0. the technical reference tells that dmtimer 1ms could be a wakeup source too.

how could i replace dmtimer 1ms as the wakeup source, instead of UART0?

I am checking out TIOCP_CFG Register (offset = 10h) for possibility.

thank you in advance,

over 10 years ago

0 cahide sen over 10 years ago

Prodigy 130 points

btw, i am using IAR Embedded Workbench, not linux.

0 Biser Gatchev-XID over 10 years ago in reply to cahide sen

TI__Guru**** 393215 points

Moving this to the Starterware forum.

0 Lalindra Jayatilleke over 10 years ago

TI__Mastermind 30365 points

Cahide,

Which version of Starterware are you using?

Note that there is another timer example that is part of the AM335xSK demo program (evmskAM335x\demo). The example seems to have a dmtimer_1ms based wakeup.

http://processors.wiki.ti.com/index.php/AM335x_StarterWare_Power_management

Just FYI, there is another e2e thread where someone had posted some baremetal code on using the dmtimer_1ms timer which might be of some guidance.

https://e2e.ti.com/support/arm/sitara_arm/f/791/t/238858

Lali

0 cahide sen over 10 years ago in reply to Lalindra Jayatilleke

Prodigy 130 points

starterware version = 02_00_01_01

initializeTimer1() in the demoTimer.c in demo folder, these registers are manipulated as last actions:

/* wake up configs */ => TIOCP_CFG Register
HWREG(0x44e31010) = 0x214;

/* enable overflow int */
HWREG(0x44e3101c) = 0x2;

/* enable overflow wakeup */ => TWER Register
HWREG(0x44e31020) = 0x2;

i integrated the actions above, however no change. I still have to rely on on {UART0 initialization and usag}e to wake up.

any other register to manipulate so that "1ms dmtimer" wakes up the system, not UART0?

thanks,

0 cahide sen over 10 years ago in reply to cahide sen

Prodigy 130 points

btw, "1ms dmtimer" functions fine in my application.
only problem is that "1ms Dmtimer ISR" won't fire unless I initialize UART0 and send at least one message via UART0.
I want to get rid of the dependency on UART0.thanks,

0 Lalindra Jayatilleke over 10 years ago in reply to cahide sen

TI__Mastermind 30365 points

Cahide,

In the demo project, did you try the PM examples and did they have a dependency on the UART as well? DS1 and DS0 uses dmtimer_1ms for wakeup and Standby uses dmtimer_6. The demo has options to wakeup on timer, touch screen, UART or GPIO. Where are you checking the dmtimer_1ms ISR status (register location)?

http://processors.wiki.ti.com/index.php/AM335x_StarterWare_Power_management

Lali

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am335x starter kit dev board, how to wake up from "dmtimer 1ms"?