How to use DMA function to achieve FTM input capture?

[tianyunfang]

How to use DMA function to achieve  FTM  input capture?

In interrupt mode, I have achieved,but I don't know how to configue it in dma mode, following is my code,use FTM0 ch0 &ch1 measure PWM duty, in debug mode,there is no change for reg FTM0->CONTROLS[1].CnV,but not interrupt mode.

Please help me!

/****************************************************************************************************/

void DmaInit(void)
{
 uint8_t index = 0;
 
  DmaMuxInit();

 SIM->PLATCGC |= SIM_PLATCGC_CGCDMA(1);

  DMA->TCD[0].CSR &= 0xFFFFFFFF ^ DMA_TCD_CSR_DONE_MASK; 

  DMA->TCD[0].SADDR = DMA_TCD_SADDR_SADDR(&(FTM0->CONTROLS[1].CnV));     

  DMA->TCD[0].SOFF = DMA_TCD_SOFF_SOFF(0);               

  DMA->TCD[0].ATTR = DMA_TCD_ATTR_SMOD(0) | DMA_TCD_ATTR_SSIZE(1) | DMA_TCD_ATTR_DMOD(0) |       DMA_TCD_ATTR_DSIZE(1);        

 DMA->TCD[0].NBYTES.MLOFFNO = DMA_TCD_NBYTES_MLNO_NBYTES(2);

  DMA->TCD[0].SLAST = 0;

  DMA->TCD[0].DADDR = DMA_TCD_DADDR_DADDR(&(RxDmaCan1DataFifo[0]));

  DMA->TCD[0].DOFF = DMA_TCD_DOFF_DOFF(0);

  DMA->TCD[0].CITER.ELINKNO = DMA_TCD_CITER_ELINKNO_CITER(1) | DMA_TCD_CITER_ELINKNO_ELINK(0);

  DMA->TCD[0].DLASTSGA = DMA_TCD_DLASTSGA_DLASTSGA(0);

  DMA->TCD[0].BITER.ELINKNO = DMA_TCD_BITER_ELINKNO_BITER(1) | DMA_TCD_BITER_ELINKNO_ELINK(0); 
#ifndef DMA_CHANNEL_IQR

 DMA->TCD[0].CSR = DMA_TCD_CSR_BWC(0) | DMA_TCD_CSR_MAJORELINK(0) | DMA_TCD_CSR_MAJORLINKCH(0) | DMA_TCD_CSR_ESG(0) | DMA_TCD_CSR_DREQ(0) | DMA_TCD_CSR_INTHALF(0) | DMA_TCD_CSR_INTMAJOR(1) | DMA_TCD_CSR_START(0);  
#else
 DMA->TCD[0].CSR = DMA_TCD_CSR_BWC(0) | DMA_TCD_CSR_MAJORELINK(0) | DMA_TCD_CSR_MAJORLINKCH(0) | DMA_TCD_CSR_ESG(0) | DMA_TCD_CSR_DREQ(0) | DMA_TCD_CSR_INTHALF(0) | DMA_TCD_CSR_INTMAJOR(0) | DMA_TCD_CSR_START(0);  
#endif

  DMA->SERQ = DMA_SERQ_SERQ(0);

#ifndef DMA_CHANNEL_IQR

 INT_SYS_EnableIRQ(DMA0_IRQn);
#endif
}

/****************************************************************************************************/

static void DmaMuxInit (void)
{

 PCC->PCCn[PCC_DMAMUX_INDEX] |= PCC_PCCn_CGC_MASK; 
 

 DMAMUX->CHCFG[0] &= ~DMAMUX_CHCFG_ENBL(1);

 DMAMUX->CHCFG[0] |= DMAMUX_CHCFG_SOURCE(36);

 DMAMUX->CHCFG[0] |= DMAMUX_CHCFG_ENBL(1);

}

/****************************************************************************************************/

void FTM0_init(void)
{
  PCC->PCCn[PCC_FTM0_INDEX] &= ~PCC_PCCn_CGC_MASK;  /* Ensure clk disabled for config */
  PCC->PCCn[PCC_FTM0_INDEX] |= PCC_PCCn_PCS(1) |  PCC_PCCn_CGC_MASK; /* Clock Src=1, 8 MHz SOSCDIV1_CLK */
                                   /* Enable clock for FTM regs */
  FTM0->MODE |= FTM_MODE_WPDIS_MASK;  /* Write protect to registers disabled (default) */
  FTM0->SC = 0x000C0107;    

                                   /* Enable PWM channel 0 input*/
                             /* Enable PWM channel 1 input*/                      

                              /* Enable PWM channel 2 output*/
                             /* Enable PWM channel 3 output*/
                             /* TOIE (Timer Overflow Interrupt Ena) = 1 (enable) */
                             /* CPWMS (Center aligned PWM Select) = 0 (default, up count) */
                             /* CLKS (Clock source) = 0 (default, no clock; FTM disabled) */
                             /* PS (Prescaler factor) = 7. Prescaler = 128 */
  FTM0->COMBINE = 0x00000004;/* FTM mode settings used: DECAPENx = 1, DECAP = 0£¬MCOMBINEx = 0, COMBINEx=0  */
  FTM0->POL = 0x00000000;    /* Polarity for all channels is active high (default) */
  FTM0->MOD = 62500 - 1 ;    /* FTM1 counter final value (used for PWM mode) */
                             /* FTM1 Period = MOD-CNTIN+0x0001 ~= 62500 ctr clks  */
                             /* 8MHz /128 = 62.5kHz ->  ticks -> 1Hz */
}

/****************************************************************************************************/

void FTM0_CH0_IC_init(void)
{
  FTM0->CONTROLS[0].CnSC = 0x00000059;  /* FTM0 ch6: Input Capture fall edge */
                                        /* CHIE (Chan Interrupt Ena) = 1 (enable) */
                                        /* MSB:MSA (chan Mode Select)=0b01, Continue */
                                        /* ELSB:ELSA (ch Edge/Level Select)=0b10, fall*/
                                       /* DMA enable */
}

/****************************************************************************************************/

void FTM0_CH1_IC_init(void)
{
  FTM0->CONTROLS[1].CnSC = 0x00000045;  /* FTM0 ch7: Input Capture rising edge */
                                        /* CHIE (Chan Interrupt Ena) = 1 (enable) */
                                        /* MSB:MSA (chan Mode Select)=0b00, Continue */
                                        /* ELSB:ELSA (ch Edge/Level Select)=0b01, rise*/
                                       /* DMA enable */
}

[tianyunfang]

By the way, DMA interrupt is ok!