General Category > Discussion - EVE

BT816 NOT START ALL THE TIMES- WHITE SCREEN

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SANDU ONICA:
Hello,
Thank you for your advice.
I don't understand why 1 from 10 start up the touchscreen fails and another 9 times working good.

Best regards,

Sandu Onica

Rudolph:
I am not sure what the actual issue is.
Well, okay, I get that you see the BT816 not starting reliably.
However, you also claim that you were using the FT800 and never had this issue.

The difference between FT80x and FT81x and beyond in regards of power down is that
you have to use the Power Down line with FT80x to wake it up.
And with FT81x and beyond it is possible to get from POWER DOWN state to ACTIVE state by SPI if EVE was brought
into POWER DOWN state by SPI and the PD_N pin is also high.

The price that you can wake up FT81x+ via SPI is a much higher "Power Down Current" since that internal voltage regulator can not be turned off.
That is not the issue, this is a feature and the remaining 0.2mA could be saved by switching off the power supply.

So your function to start a FT800 that you not had a problem with should be doing just fine starting a BT816.

My code always used the PD_N pin as a first measure in my EVE_init() und it is doing just fine with all EVEs.
Only for the case that the PD_N pin would not be connected for some reason I have this line in my EVE_init():
/* EVE_cmdWrite(EVE_CORERST,0); */ /* reset, only required for warm-start if PowerDown line is not used */

And I have it commented out since all my hardware connects the PD_N pin.

SANDU ONICA:
Hello,

I succeeded, BT 816 START without problems.
I activated PWM DISPLAY, PCLK and GPIO after writing the first display list.
Now everything is OK, thanks for everything.

Best regards,


Sandu Onica

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