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CCS/TMS320F28027: Problem in Plotting of different frequency sine waves

ADDAGUDURU SURYA KIRAN
Intellectual 770 points

Part Number: TMS320F28027

Tool/software: Code Composer Studio

Sir/Madam,

I created a lookup table for sine wave and value is called after a calculated interval with help of CPU timers to obtain required frequency of sine wave. When I am plotting in ccs graphs although the interval in the CPU timers is changed the frequency of the sine wave is not changing i.e.., the plot of 50 Hz and 100 Hz sine wave is same for fixed period (20 milli seconds) why it is so??