How should i configure MKM33 AFE?

davidmartínezag — Mon, 31 Aug 2015 14:10:09 GMT

Hi!!!

Currently i am working using a MKM33. I try to configure the AFE but i don't get that works. In my projects the main configuration for all is:

	SIM_Init (SIM_MODULE_ALL_PERIPH_ON_CONFIG);

/* clock mode 1:1:1, 24MHz

SIM_SetClkMode (SYSCLK_MODE0);

SIM_SetClkDiv (SYSCLK_DIV1);

FLL_Init (FLL_MODULE_FEI_24MHZ_CONFIG);

From this configuration I have to do the rest of peripherals configuration. if someone could help me I will be very grateful.

Thanks for advance.

David

Re: How should i configure MKM33 AFE?

isaacavila — Fri, 04 Sep 2015 16:14:33 GMT

Hi David,

According to what i am seeing in your code, your are using KM128SWDRV_R4_0_0 software version for KM family. If so, there is a useful example that shows all the configuration for AFE peripheral for polling and interrupt mode and low power as well. (<FREESCALE_PATH>\KM128SWDRV_R4_0_0\build\cw_10_6\projects)

In this example, KM is configured as follows:

void main(void)
{
  /* initialize SIM module                                                    */
  SIM_Init  (SIM_MODULE_ALL_PERIPH_ON_CONFIG);
  /* clock mode 2:1:1, 48MHz                                                  */
  SIM_SetClkMode (SYSCLK_MODE1);
  SIM_SetClkDiv  (SYSCLK_DIV1);
  FLL_Init  (FLL_MODULE_FEE_48MHZ_CONFIG);
  /* sets 32 KHz RTC Oscillator as the source of the PLL and enable PLL       */
  PLL_Enable (PLL32KREF_SRC1);
  /* VREF module must be initialized after SIM module                         */
  VREF_Init (VREF_MODULE_CHOP_ON_1V75_0V4_HPWR_CONFIG,
             VREF_SWITCH_S1_L_S2_L_S3_L_BUFF_ON);
  /* AFE_CH1 init                                                             */
  SIM_SelAfePllClk (SIM_MCG_PLL_CLK);
  AFE_ChInit (CH0, AFE_CH_SWTRG_CCM_PGAOFF_CONFIG(DEC_OSR64), 0, PRI_LVL0, NULL);
  AFE_Init   (AFE_MODULE_RJFORMAT_CONFIG(AFE_PLL_CLK, AFE_DIV2, 12288000));
  /* initialize UART and FreeMASTER                                           */
  PORT_Init (PORTI, PORT_MODULE_ALT2_MODE, PIN0|PIN1);
  UART_Init (UART1, UART_MODULE_POLLMODE_CONFIG(38400,48e6));
  FMSTR_Init();
  diagnostic_setup ();
  /* trigger AFE conversions                                                  */
  AFE_SwTrigger (CH0);
  /* main loop                                                                */
  while (1)
  {
    if (AFE_ChReady(CH0))
    {
      result = AFE_ChRead (CH0);
      FMSTR_Recorder ();
    }
    FMSTR_Poll ();
  }
}

In this configuration, FreeMaster is used so you can ommit FMSTR_ functions.

I hope this can help you.

If you have any specific doubt please let me know it.

Regards,

Isaac

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Re: How should i configure MKM33 AFE?

davidmartínezag — Wed, 09 Sep 2015 07:18:50 GMT

Thanks Isaacavila!!!

Are you from Spain?

Anyway i used that configuration. The isuue is that my board doesn't external clock, i am using the internal clock of the microcontroller, this means that FLL is busy for the general configuration, then i can't use it. My idea is use the PLL for the AFE but I can't do it.

thanks for advance!!!

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