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STM32F42X - TIMER + DAC + DMA: SINE WAVE

Question asked by aloisini.ennio on Mar 19, 2014
Latest reply on Mar 29, 2014 by Clive One
Dear All,
I would like to create a 1.5 MHz Sine Wave using TIMER + DAC + DMA.
I have started from the DAC_SignalsGeneration example for Discovery board and then I have modified the TIM_TimeBaseStructure.TIM_Period  from 0xFF to 1.
I have done the measurement with the oscilloscope and in the first case (Period = 0xFF) the sine wave has a frequency of 11kHz and in the second case (Period = 1) the sine wave has a frequency of 350kHz. Sincerly I thought to obtain an higher frequency because the period is 255 times lower. Could anyone explain this behaviour? 
Then I would like to know if it is possible to create a 1.5 MHz Sine Wave with Timer + DAC + DMA or if it is better to use a different solution.
Let me know!


Best regards

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