Core Ink screen fades on reset
ciconde last edited by ciconde
I thought that ePaper kept the last drawing despite power off.
My screen ink starts to fade away and gets dim grey in less than 3 seconds after I press the reset button. Is it the expected behavior or I have a faulty unit?
ciconde last edited by
For a quick comparison, here it is when power is on:
felmue last edited by felmue
when run from battery a reset (cut power) is not the same as a shutdown (power off). I see the same fading when I reset my M5CoreInk with the reset button on the back. However when I do a shutdown (programmatically) the content on the screen stays and doesn't fade away.
Note: In UIFlow you can use
Power - Power offto do the shutdown.
fonix232 last edited by
A reset will trigger a power cycle, which in turn resets the SPI connection to the e-ink display. The display has a controller built-in, which at this point is also power cycled, and most likely runs the initialisation of the screen. So when you press the reset button, the display thinks it needs to get into a "ready for new data" state, which is why it "fades".
If you want to work this around, I'd recommend storing the screen contents every time you write to the screen, to storage that is preserved during a power cycle (basically, dump that 200x200 4b array onto the flash), and make sure that your startup handling "updates" the screen with that content immediately after the device is initialised.
ajb2k3 last edited by
In UIFlow you need to use the Set HV block to before screen draw before powering the coreink off otherwise you get the fading on shutdown.