about SPI of MKL05Z32,Why receive data is "\0" ?

[thoomanwang]

I use MKL05Z32 SPI interface with another device communications, MKL05 as Master, why the received data is always "\ 0"?

[thoomanwang]

Use MKL05 SPI interface communication, choose pin cs signal output began to output data after how long?

[adriancano]

Hi,

Can you please share the configuration you are using for the SPI module?

Best Regards,

Adrian

[thoomanwang]

void SPI_InitMater( void )

{

  // enable clock gate for spi module

   SIM_SCGC4 |= SIM_SCGC4_SPI0_MASK;

   // enable PORT

   SIM_SCGC5 |= SIM_SCGC5_PORTA_MASK|SIM_SCGC5_PORTB_MASK;

   // disable SPI

   SPI0_C1 &= ~SPI_C1_SPE_MASK;

   // configure I/O to SPI function

   /*

  PORTA_PCR5 &= ~PORT_PCR_MUX_MASK;

  PORTA_PCR5 |= PORT_PCR_MUX(3)|PORT_PCR_DSE_MASK;  //Use PTA5 as SPI0_SS_b

  */

    PORTA_PCR6 &= ~PORT_PCR_MUX_MASK;

  PORTA_PCR6 |= PORT_PCR_MUX(3)|PORT_PCR_DSE_MASK;  //Use PTA6 as SPI0_MISO

    PORTA_PCR7 &= ~PORT_PCR_MUX_MASK;

  PORTA_PCR7 |= PORT_PCR_MUX(3)|PORT_PCR_DSE_MASK;  //Use PTA7 as SPI0_MOSI

    PORTB_PCR0 &= ~PORT_PCR_MUX_MASK;

  PORTB_PCR0 = PORT_PCR_MUX(3)|PORT_PCR_DSE_MASK;    //Use PTB0 as SPI0_SCK

  SPI0_C1 |= SPI_C1_MSTR_MASK;

  //SPI0_BR = 0x02;

  //SPI0_BR = (SPI_BR_SPPR(0x06) | SPI_BR_SPR(0x00));//速率1.713MHz

  //SPI0_BR = (SPI_BR_SPPR(0x02) | SPI_BR_SPR(0x02));

  SPI0_BR = (SPI_BR_SPPR(0x02) | SPI_BR_SPR(0x03));//436.907KHz

  SPI0_C1 |= SPI_C1_SSOE_MASK; 

  SPI0_C2 |= SPI_C2_MODFEN_MASK;

  SPI0_C2 |= SPI_C2_SPC0_MASK;

  SPI0_C2 &= ~SPI_C2_SPC0_MASK;

  SPI0_C1 |= SPI_C1_CPHA_MASK;

  SPI0_C1 &= (~SPI_C1_CPHA_MASK);

  SPI0_C1 |= SPI_C1_CPOL_MASK;

  SPI0_C1 &= (~SPI_C1_CPOL_MASK);

  SPI0_C1 |= SPI_C1_LSBFE_MASK;

  SPI0_C1 &= (~SPI_C1_LSBFE_MASK);

  SPI0_C1 |= SPI_C1_SPE_MASK;

}

用的例程中的配置，slave的极性和相位都是0

[kerryzhou]

Hi Thooman wang,

     Could you tell me which your slave is?

     Can you make sure your slave is not out put "\0"?

   Waiting for your reply!

Jingjing

[thoomanwang · Accepted solution]

The problem has been resolved, please see this post https://community.freescale.com/thread/333858