关于FTM输出波形

mscs13179 · 发表于 2015-1-22 10:18:06

主要代码如下

｛
。。
      PORTA_PCR18 = PORT_PCR_MUX(4);//PTA18 as FTM_CLKIN0

               //init the SIM clock, using FTM0_CH6
      SIM_SCGC6 |= SIM_SCGC6_FTM0_MASK;
      FTM0_STATUS;
      FTM0_STATUS = 0;
      //prescale = 1, clock source = bus clock
      FTM0_CNTIN = 0;

      FTM0_C6SC = FTM_CnSC_MSA_MASK|FTM_CnSC_ELSA_MASK; //ELSB:ELSA= 0b01, MSB:MSA= 0b01 means output compare, tougle output on match
      FTM0_C6V = 1;
      FTM0_MOD = (periph_clk_mhz/2)/SIM_CLK -1; //generate 2MHz CLK

      FTM0_MODE |= FTM_MODE_FTMEN_MASK;
      FTM0_OUTMASK &= ~FTM_OUTMASK_CH6OM_MASK;
      FTM0_SC = FTM_SC_PS(0)|
               FTM_SC_CLKS(1);
｝
想通过FTM产生一个2MHZ的clk

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