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JMan.1
JMan.1
Visitor II
January 4, 2021
Question

Dac output of stm32h7 at startup

  • January 4, 2021
  • 2 replies
  • 727 views

Hi,

I have a problem When I use Dac output of stm32h7 . Dac output go high (3.3v) for 200ms and then it go to adjusted value. Why?

How can I prevent this event?

This topic has been closed for replies.

2 replies

TDK
TDK
January 4, 2021

The answer will depend on your code. To avoid a bad value on the pin, ensure the DAC is completely set up prior to assigning the DAC alternate function mode to the pin. I don't think this is possible with HAL by default.

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Tesla DeLorean
Tesla DeLorean
Guru
January 4, 2021

Depends on where the 200ms comes from, if it is from spinning up the HSE and PLL, you'd probably want to configure critical pins early. The earliest opportunity being in the Reset_Handler.

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