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Author Topic: Reading Tag vs External Clock  (Read 8177 times)

Rad

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Reading Tag vs External Clock
« on: January 15, 2024, 09:40:46 AM »
Hello,

In my recent project I use Riverdi RVT70HSBNWC00 (BT817Q), Arduino Maga and modified old Bridgetek FT800 library.

The problem I am facing now is reading the touch Tag when EVE is feed from the external crystal (HostCommand(FT_CLKEXT) followed by HostCommand(FT_ACTIVE) - w/o freq adjustment).
There is no a such problem when the internal clock is used (HostCommand(FT_CLKINT) followed by HostCommand(FT_ACTIVE) ).

The display behaves as normal, just the touch does not.

Any idea what could be the problem/fix?

Thanks in advance
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Rudolph

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Re: Reading Tag vs External Clock
« Reply #1 on: January 16, 2024, 04:41:48 PM »
There is no CLKINT command in the BT81x, it has been removed from the datasheet.
So there is a good chance that it does not work reliably if it works at all.

That said, I have a RVT70HSBNWC00 and the touch is fine when using CLKEXT without special provisions.

Are your logic and backlight supplies stable and provide enough current?
Really? Even in the moment when you switch on the backlight?

Have you tried calibrating it?
Have you tried reading REG_TOUCH_RAW_XY?
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