Sampling method to generate three-phase SPWM wave open-loop speed control procedures for the carrier frequency 20KHz, or carrier period is 50μs. DSP crystal 10MHz, internal 4 multiplier, the clock frequency of 40MHz, counting cycle 25ns. Assuming wave frequency modulation by external input (1 ~ 50Hz), and converted into a suitable format

laowai
......\laowai.c
......\laowai.pjt
......\laowai_t.c
......\SPWM16.c
......\采样SPWM程序.doc

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