pisentry has been switched to use a TFT display for its system build. This addresses getting the TFT display working so it can be used for pifile and a template metabuild has been pushed for pifile. However, pifile still needs all the internals added, not to mention UI apps, appropriate for managing a file server.

The UI is now working quite well. It shows all mount points with the total and available space graphed in percentages. This is different than the previous description and doesn't show the status bar as described. Instead,

Now it's time to show I/O activity.

Trying to read disk activity - it's not easy to figure out how to do this. One way is to see what iostat does. In summary:

First time setup¶

1. Open /sys/block/<device>/stat and read (it's one line)
   1. device is sda1, sdb2, etc, which is what they'll look like under /media/usb and /media/smb
2. Parse file
   1. see read_sysfs_file_stat_work()
   2. see https://www.kernel.org/doc/Documentation/block/stat.txt
3. saveread and write IOs as lastRead
   1. read again after 20ms, save as currentRead
   2. compute change from lastRead to currentRead, store as lastChange
   3. move currentRead to lastRead, clear currentRead

Iteration¶

1. Open /sys/block/<device>/stat and read (it's one line)
   1. device is sda1, sdb2, etc, which is what they'll look like under /media/usb and /media/smb
2. Parse file
3. saveread and write IOs as currentRead
4. compute change from lastRead to currentRead, store as currentChange
5. compute percentage change from lastChange to currentChange - display it.
6. move currentChange to lastChange
7. move currentRead to lastRead

I dropped all of the I/O stuff. It's only purpose was to show disk I/O activity and it's hardly worth the effort since file system activity is not really based on mount points - you have to map between the two. It's just extra work for little benefit here.

So now the statuswidget is just a fullscreen popup window that shows the exports file. This allows the user to see which devices are being exported from the PiStore system. The window gets hidden and revealed by touching the left of middle columns of the display (or hitting the TAB key) and the app can be quit by touch the right column of the display (or typing Ctrl-Q or the home key, which is the ESC key on PiBox).

System is now in test. It boots and starts okay but has some problems with moving between windows and the fonts are too big.

The UI is cleaned up for the small touchscreen, with touchscreen regions used now (instead of ABS position). I also fixed fonts to be more readable on small screens.

The only thing left to is make the app only look at mounts under /media/usb or /media/smb. Right now it shows all mount points including the the mmc boot device.

All known bugs fixed.
Changes committed and pushed.
Closing issue.