topic Re: SPI using KEA128 in Kinetis Microcontrollers

SPI using KEA128

jashanm — Mon, 29 Jun 2015 07:02:18 GMT

hi all,

i am working on KITMC07XS5617EVB and KEA128 via SPI. I am initialising it but the SPI_D register is not updating, am initialising SPI0 using following code...

void SPI_INIT(){

SIM_SCGC |= SIM_SCGC_SPI0_MASK;

SPI0_C1 |= SPI_C1_SPE_MASK;

SPI0_C1 |= SPI_C1_MSTR_MASK;

SPI0_C1 |= SPI_C1_CPHA_MASK;

SPI0_C2 |= SPI_C2_SPMIE_MASK;

SPI0_S |= SPI_S_SPTEF_MASK;

SPI0_S |= SPI_S_MODF_MASK;

SPI0_S |= SPI_S_SPRF_MASK;

SPI0_S |= SPI_S_SPMF_MASK;

}

am i missing something here in SPI ???

Re: SPI using KEA128

jashanm — Tue, 30 Jun 2015 07:25:16 GMT

hi,
i am using the following code to be clear.

void SPI_INIT(){ // to initialise the SPM module...

SIM_SCGC |= SIM_PINSEL_SPI0PS_MASK;

SIM_SCGC |= SIM_SCGC_SPI0_MASK;

SPI0_BR = 0x00;

SPI0_C1 |= SPI_C1_SPE_MASK;

SPI0_C1 |= SPI_C1_MSTR_MASK;

SPI0_C1 |= SPI_C1_CPOL_MASK;

SPI0_C1 |= SPI_C1_SSOE_MASK;

SPI0_C1 |= SPI_C1_LSBFE_MASK;

SPI0_C2 |= SPI_C2_SPMIE_MASK;

SPI0_C2 |= SPI_C2_MODFEN_MASK;

SPI0_M = 0x64;

}

while(SPI_S_SPTEF_MASK){ // checking for tx buffer

SPI0_C1 = 0x5d;

SPI0_C2 = 0x80;

SPI0_D = RX; // to send the data

SPI0_C1 |= SPI_C1_SSOE_MASK;

SPI0_C2 |= SPI_C2_MODFEN_MASK;

am i missing something ??

Re: SPI using KEA128

kerryzhou — Wed, 01 Jul 2015 06:06:41 GMT

Hi Jashan Mahadevu,

Which baud do you want to define? If you you define SPI0_BR=0x00, did you calculate the baud rate, whether your SPI slave device can use this baud rate?

You code have some problem, I help you do some modifications:

void SPI_INIT(){ // to initialise the SPM module...

SIM_PINSEL0 |= SIM_PINSEL_SPI0PS_MASK; // choose PTE0, PTE1, PTE2, and PTE3. as SPI pin

SIM_SCGC |= SIM_SCGC_SPI0_MASK;

SPI0_BR = 0x00; //choose the right BR to get the proper baud rate

SPI0_C1 |= SPI_C1_MSTR_MASK;

SPI0_C1 |= SPI_C1_CPOL_MASK;

SPI0_C1 |= SPI_C1_SSOE_MASK;

SPI0_C1 |= SPI_C1_LSBFE_MASK;

SPI0_C2 |= SPI_C2_SPMIE_MASK;

SPI0_C2 |= SPI_C2_MODFEN_MASK;

SPI0_M = 0x64;

SPI0_C1 |= SPI_C1_SPE_MASK;

}

//Send Data

uint8_t SPI_WriteData(uint8_t *pWrite,uint32_t uiLength)

{

uint16_t i;

for( i=0;i<uiLength;i++)

{

while(!(SPI0_S & SPI_S_SPTEF_MASK ) );// take care, not just SPI_S_SPTEF_MASK

SPI0_D = pWrite[i];

}

return 1;

}

// Send and read data

uint8_t SPI_WriteReadData(uint8_t *pRead,uint8_t *pWrite,uint32_t uiLength)

{

uint16_t i;

for( i=0;i<uiLength;i++)

{

while(!(SPI0_S & SPI_S_SPTEF_MASK ) );

SPI0_D = pWrite[i];

while(!(SPI0_S & SPI_S_SPRF_MASK ) );

pRead[i] = SPI0_D;

}

return 1;

}

Please try again,

Wish it helps you

Have a great day,

Jingjing

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Re: SPI using KEA128

jashanm — Thu, 02 Jul 2015 06:54:58 GMT

hi jingjing,

i modified my code accordingly, it works fine! thank you.

Regards,

Jashan M