I am using B-L475E-IOT01A1. I'm using B-L475E-IOT01A1 now. I want to do DAC. When I only operate DAC, it works well. However, when using DAC with TIMER and DMA, it does not work. Board itself doesn't work?

[GKIM.4]

I want to generate sine wave using DAC, TIMER, DMA.

When TIMER do update event, Board makes DAC output.

Please Help me.