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);
}
