DR800 Shutdown mode - proof of concept

[Gertjan]

Originally Posted by Shaggy

The other reason I'm leaning this way is that, in my mind, calling it from a link on the SD card is only a first step. The goal I have in mind is to have the power switch configurable between the long press either doing a restart or a shutdown.

There are pros en cons for both solutions, but either of them can work fine.

A "long press" triggering a restart is hard-wired so it always works, even if the firmware and/or standby micro have failed. Downside is that it can't be replaced with a shutdown.

[Shaggy]

Originally Posted by Gertjan

A "long press" triggering a restart is hard-wired so it always works, even if the firmware and/or standby micro have failed. Downside is that it can't be replaced with a shutdown.

I didn't know that, thanks. It makes sense though.

[TGS]

@ Shaggy and GregorRichards

You guys seemed to be making progress on this but news has dried up. Anything new?

[Shaggy]

Originally Posted by TGS

@ Shaggy and GregorRichards

You guys seemed to be making progress on this but news has dried up. Anything new?

I haven't gone any further with it. GregorRichards solution works, but it requires navigating to and clicking on an icon. I was hoping to tie it to a button, but am not sure if that's realistic. As Gertjan says, the long power switch press is hardwired. I was thinking of maybe looking at swapping out the right press from locking buttons (which I never do anyway) to a shutdown. I haven't had the time to look into it to see if that's possible or not though.

[javifields]

GregorRichards' program does not work in my DR800S wth 2.0 RC2.
After executing it, the ebook does not shutdown. It remains on, but in the screen I can only see the Title of the page (SD Card - by Title... in fact in Spanish). The list of folders/books is not visible. The only way to make it working again is reseting it by
sliding the power switch to the left and holding it for some seconds.

[Shaggy]

Originally Posted by javifields

GregorRichards' program does not work in my DR800S wth 2.0 RC2.
After executing it, the ebook does not shutdown. It remains on, but in the screen I can only see the Title of the page (SD Card - by Title... in fact in Spanish). The list of folders/books is not visible. The only way to make it working again is reseting it by
sliding the power switch to the left and holding it for some seconds.

Might be something changed with the beta/RC that effected his program. I think it was originally written on the 1.0 firmware.

[javifields]

Thank you Shaggy.
If someone develops a shutdown procedure for DR800S with 2.0 RC2 I will be very grateful!

[Opensesame]

After shut down, I lost the bookmarks and also the pages I need continue ... ;-(

[Shaggy]

Originally Posted by Opensesame

After shut down, I lost the bookmarks and also the pages I need continue ... ;-(

Yeah, they said elsewhere that bookmarks/etc are only saved at certain times. If you do a hard reset, it's possible to loose recent ones. I imagine a shutdown, if not coded correctly, could cause the same problem.

Which shutdown method did you try?

[Opensesame]

Originally Posted by Shaggy

Yeah, they said elsewhere that bookmarks/etc are only saved at certain times. If you do a hard reset, it's possible to loose recent ones. I imagine a shutdown, if not coded correctly, could cause the same problem.

Which shutdown method did you try?

I used yours.

[Shaggy]

Originally Posted by Opensesame

I used yours.

Yeah, mine was a quick hack and will definitely cause problems like that. The one that GregorRichards posted is much cleaner in that it gets the applications to save/close before shutting down (mine doesn't).

Ultimately I'd like to keep working on this and make it nicer, but haven't had the time.

[gioachin]

One comment on the battery consumption. I used the program irexshutdown with 2.0-beta firmware. I compiled the code with the SDK and installed it (Note that I added the flag -P to the shutdown system call). By using it, the irex fully shuts down in about 15-20 seconds. Later when I slided the button it did the whole long booting process.
That said, I left it off for about two days and the battery went down from 48% to 35%. So I'm not sure if it actually powers down the device.

[Shaggy]

Originally Posted by gioachin

One comment on the battery consumption. I used the program irexshutdown with 2.0-beta firmware. I compiled the code with the SDK and installed it (Note that I added the flag -P to the shutdown system call). By using it, the irex fully shuts down in about 15-20 seconds. Later when I slided the button it did the whole long booting process.
That said, I left it off for about two days and the battery went down from 48% to 35%. So I'm not sure if it actually powers down the device.

Not sure what happened. When I did it with my script (which isn't safe, so don't use it), it went 18 hours without losing any battery.

[dima_tr]

Working with Notepad application as well as "Hello World" I might have gotten a hint. Every respectable app has a callback describing what to do on suspend. E.g. Notepad saves its state:

     static void on_prepare_standby( 
            eripc_context_t          *context,
            const eripc_event_info_t *info,
            void                     *user_data )
    {
        LOGPRINTF("entry");
        (void) gInstance->save();
        LOGPRINTF("exit");
    }

So, the idea is to launch an application with the lowest priority which should have in this callback

  * wait for say 5 seconds for others to prepare for suspend
  * call /sbin/shutdown

Having this app running we then can trigger a software/hardware suspend - either special menu item or use power button for 0.5 sec. The system will be switched off due to the callback in our special app. Sending "suspend" signal we guarantee everything is saved before shutdown.

What do you say?


Edit: calling unmount_sd might not work clean, e.g. Notepad does gInstance->quit(); instead of saving. And we can just try modifying GregorRichards's code by explicit call of suspend (will this work though?).

is this thread somewhat the same as your Hidden gems, dima_tr?