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FPU comsums seeable extra power?

Question asked by Attila . on Nov 5, 2014
Latest reply on Nov 5, 2014 by Clive One
Hi  everyone!

I have a project where necessary to use FPU to proccess my AD data. If I enable the FPU in the uVision Keil, then I can see an extra noise on my power line and I get wrong values, but when I disable the FPU, values are good and the measurement is correct. I'm developing on the STM32F407 eval board. I have attached 2 picture. The same code with and without FPU. Im not allowed to tell the goal of the signals, but the blue one shows the power in AC mode. Anybody has the same or similar experience?

All the best,