SPI issue on KL26Z when reading L3GD20

omarvallecasas — Mon, 31 Aug 2015 18:35:17 GMT

Hello, we're working with KL26Z and trying to read Gyro L3GD20 by SPI protocol. When configuring as spi0_init(); L3GD20_init(); and reading with spi_read(L3G_OUT); signal observed in MISO doesn't change (See image from SCLK: orange and MISO: blue). That's why we think maybe we're missing something as a flag from KL26Z. Maybe someone can give us a clue.

Thanks in advance,

Omar

void spi0_init (void){

/*A comunicação SPI0 se dá pela PORTA C */

*CHIP SELECT (SPIO_PCS0) : PTC4

*CLOCK (SPI0_SCK) : PTC5

*MOSI (SPI0_MOSI) : PTC6

*MISO (SPI0_MISO) : PTC7

SIM_SCGC5 |= SIM_SCGC5_PORTC_MASK;

SIM_SCGC4 |= SIM_SCGC4_SPI0_MASK;

PORTC_PCR4 |= PORT_PCR_MUX(0x2);

PORTC_PCR5 |= PORT_PCR_MUX(0x2);

PORTC_PCR6 |= PORT_PCR_MUX(0x2);

PORTC_PCR7 |= PORT_PCR_MUX(0x2);

/* Inicialização da SPI em Master Mode 16-bit e FIFO = 0 */

SPI0_C1 |= (SPI_C1_MSTR_MASK | SPI_C1_SSOE_MASK );//Set SPI0 to Master & SS pin to auto SS

SPI0_BR |= (SPI_BR_SPPR(0x02) | SPI_BR_SPR(0x08)); //Set baud rate prescale divisor to 3 & set baud rate divisor to 64 for baud rate of 15625 hz

//Enable SPI0

SPI0_C2 |= (SPI_C2_MODFEN_MASK|SPI_C2_SPIMODE_MASK); //Master SS pin acts as slave select output

SPI0_C1 |= (SPI_C1_SPE_MASK); // Enable SPI module

}

void spi_write (unsigned char ADDR_REGISTER ,unsigned char DATA_REGISTER)

{

* Fluxo : Envia o endereço do registrador; Envia o dado.

while (!(SPI0_S & SPI_S_SPTEF_MASK));

SPI0_DH = 0x00| ADDR_REGISTER; // RW\ = 0; MS\ = 1

SPI0_DL = DATA_REGISTER;

}

char spi_read (unsigned char L3G_OUT){

* Fluxo : Envia o endereço do registrador a ser lido; Lê o dado (é enviado para o buffer SPI0_DL).

spi_write(0x80|L3G_OUT /*RW\ = 1 MS\ = 0*/, 0xFF /*dado falso (ignorado)*/ );

while (!(SPI0_S & SPI_S_SPRF_MASK));

return SPI0_DL;

SPI0_S &= ~SPI_S_SPRF_MASK;

}

void L3GD20_init (void){

spi_write(L3GX_CTRL_REG1, 0x0F);

spi_write(L3GX_CTRL_REG2, 0x00);

spi_write(L3GX_CTRL_REG4, 0x30);

}

Re: SPI issue on KL26Z when reading L3GD20

Hui_Ma — Wed, 02 Sep 2015 05:17:50 GMT

Hi,

I would recommend to refer attached KL25 SPI example code.

KL26 is using the same SPI module with KL25.

Wish it helps.

Have a great day,
Ma Hui

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topic SPI issue on KL26Z when reading L3GD20 in Kinetis Microcontrollers

SPI issue on KL26Z when reading L3GD20

Re: SPI issue on KL26Z when reading L3GD20