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RTC clcok slow when turning on LTDC

aabba.1
Associate III

Hi,

I am using a custom board to do some application (https://www.waveshare.com/openh743i-c-package-b.htm). On this application I should turn on LTDC (to use it with touchgfx) and I am also using the RTC.

When I am only using RTC alone, the RTC clock is correct and I can see it on pin MCO1 via my oscilloscope a good shape.

But when I turn on RTC and LTDC, the shape is wrong frequency (clock is slower 10seconds) is different then 32.768Khz and dutyCycle is different from time to time.

aabba1_0-1702234030670.png

Can I fix this issue via S/W?

1 ACCEPTED SOLUTION

Accepted Solutions

Check if there are any LSE-related errata (maybe PC13-related?).

Try different LSE drive strengths (you may need to reset the backup domain between attempts).

JW

View solution in original post

2 REPLIES 2

Check if there are any LSE-related errata (maybe PC13-related?).

Try different LSE drive strengths (you may need to reset the backup domain between attempts).

JW

aabba.1
Associate III

it work with different LSE drive strengths... thank you