Hello, I would like to communicate kwikstik <--> SDcard over SPI. But it not going, the SDcard is in sockot on kwikstik.
char spi_send(char spiMsg)
{
char temp;
while(!(SPI1_SR & SPI_SR_TFFF_MASK));
{
asm("nop"); //While buffer is not empty do nothing
}
SPI1_PUSHR = spiMsg & 0xff; //Write char to SPI
while(!(SPI1_SR & SPI_SR_RFDF_MASK))
{
asm("nop");
}
temp = SPI1_POPR;
SPI1_SR = SPI_SR_TFFF_MASK | (SPI1_SR & SPI_SR_RFDF_MASK);
return temp;
}
void init_SPI1() //SPI1 for SDcard
{
SIM_SCGC5 |= SIM_SCGC5_PORTE_MASK; //Turn on clock to module
SIM_SCGC6 |= SIM_SCGC6_SPI1_MASK; //Enable SPI1 clock
PORTE_PCR6 = PORT_PCR_MUX(1);
GPIOE_PDDR |= 1<<6;
GPIOE_PSOR |= 1<<6;
//Enable 3.3V to SDcard, see kwikstik schematics
// PORTE_PCR4 = PORT_PCR_MUX(0x2); //Set PTE4 to mux 2 [SPI1_PCS0]
PORTE_PCR1 = PORT_PCR_MUX(0x2); //Set PTE3 to mux 2 [SPI1_MOSI?]
PORTE_PCR2 = PORT_PCR_MUX(0x2); //Set PTE1 to mux 2 [SPI1_SCK]
PORTE_PCR3 = PORT_PCR_MUX(0x2); //Set PTE2 to mux 2 [SPI1_MISO?]
PORTE_PCR4 = PORT_PCR_MUX(1); //PORTE1 is CS
GPIOE_PDDR |= 1<<4; //PORTE1 is output, for CS
SPI1_MCR = 0;
SPI1_MCR |= (SPI_MCR_MSTR_MASK | SPI_MCR_HALT_MASK | SPI_MCR_DCONF(0x0) | SPI_MCR_CLR_TXF_MASK | SPI_MCR_CLR_RXF_MASK); //Set SPI1 to Master & SS pin to auto SS
SPI1_TCR = SPI_TCR_SPI_TCNT(0x0);
SPI1_CTAR0 = SPI_CTAR_FMSZ(7);
SPI1_CTAR0 |= (SPI_CTAR_PBR(3) | SPI_CTAR_BR(10));
SPI1_CTAR1 = SPI_CTAR_FMSZ(7);
SPI1_CTAR1 |= (SPI_CTAR_PBR(3) | SPI_CTAR_BR(10));
SPI1_MCR &= ~SPI_MCR_HALT_MASK;
}
