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Why so difficult generating squarewave outputsignal?

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Hi, I just can't make this work.

I just want to output a 1 Hz squarewave through Dac1

and receive it through cable to  ach0.

Can't make it work...

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Solution
Accepted by topic author laskar01

Of course it doesn't work. You don't understnd dataflow. The top loop will not start until the bottom finishes and when the bottom finishes, it will immediately stop the top loop. Remove the data dependency between the two loops (i.e. don't wire from one to the other).

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