SPI Problems

Thanks again!

I just tried your code and it is compileable but it doesen't work complitly correct. The Code looks like:

--- Quote Start ---

int status=0;

int countTMT;

// select slave (not required in single slave system)

IOWR_ALTERA_AVALON_SPI_SLAVE_SEL(SPI_MASTER_BASE, SPI_SLAVE_BASE);

// assert CS

IOWR_ALTERA_AVALON_SPI_CONTROL(SPI_MASTER_BASE, ALTERA_AVALON_SPI_CONTROL_SSO_MSK);

// wait tx channel ready

do

{

status = IORD_ALTERA_AVALON_SPI_STATUS(SPI_MASTER_BASE);

}

while (((status & ALTERA_AVALON_SPI_STATUS_TRDY_MSK) == 0) && (status & ALTERA_AVALON_SPI_STATUS_RRDY_MSK) == 0);

// (optional) data possibly to be transmitted back from slave to master upon request

IOWR_ALTERA_AVALON_SPI_TXDATA(SPI_SLAVE_BASE, 0x01);

// tx data

IOWR_ALTERA_AVALON_SPI_TXDATA(SPI_MASTER_BASE, 0x10);

// this will initiate the transfer; in the same time the slave sends out on miso pin

// the data ready in its tx register

// Wait until the interface has finished transmitting

do{

status = IORD_ALTERA_AVALON_SPI_STATUS(SPI_MASTER_BASE);

IOWR_ALTERA_AVALON_PIO_DATA(LED_PIO_BASE,countTMT & 0x01);

usleep(50000);

countTMT++;

}

while((status & ALTERA_AVALON_SPI_STATUS_TMT_MSK) == 0);

// release CS

IOWR_ALTERA_AVALON_SPI_CONTROL(SPI_MASTER_BASE, 0);

// read received data from slave

int data_rx = IORD_ALTERA_AVALON_SPI_RXDATA(SPI_SLAVE_BASE);

// data_rx must match data_tx

printf("Daten aus dem Slave:%d\n",data_rx);

// (optional) read answer from master

int recvd_answer = IORD_ALTERA_AVALON_SPI_RXDATA(SPI_MASTER_BASE);

// recvd_answer must match data_answer

printf("Daten aus dem Master:%d\n",recvd_answer);

--- Quote End ---

The result is:

--- Quote Start ---

Daten aus dem Slave:0

Daten aus dem Master:0

--- Quote End ---

I don't understand why it doesn't work because it should.

Maybe you can help me one more time. Thanks for your helt!

Regards