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Original question:

TMS320F280049: buffdac_sine_dma example adapted to TMS320F280049

TMS320F280049: buffdac_sine_dma and spurious frequency

yann volpelier
Prodigy 180 points

Part Number: TMS320F280049
Other Parts Discussed in Thread: C2000WARE

Hi

Using the C2000Ware buffdac_sine_dma code example, I have obtained with a sampling frequency of 4MHz and 40 samples a sin wave of around 100kHz

When I change the sampling frequency to 8MHz and the samples number to 80, the sin wave is around 104kHz

Could you explain me this difference of 4kHz ?

Refer to e2e.ti.com/support/microcontrollers/c2000/f/171/t/766702

and e2e.ti.com/support/microcontrollers/c2000/f/171/t/766705

Thanks a lot

Yann