C code question !! / NIOS II / SPI interface

Hi there, after a lot of searching i have found the code you requested :)

The data is sent 1 byte at a time, i have called it data, good luck with it ;)

int SPI (int data)

{

/*

* Discard any stale data present in the RXDATA register, in case

* previous communication was interrupted and stale data was left

* behind.

*/

IORD_ALTERA_AVALON_SPI_RXDATA(SPI_0_NVRAM_BASE);

// initiate SS_N

IOWR_ALTERA_AVALON_SPI_CONTROL(SPI_0_NVRAM_BASE, ALTERA_AVALON_SPI_CONTROL_SSO_MSK);

// transmit a byte, set write enable latch

while (!(IORD_ALTERA_AVALON_SPI_STATUS(SPI_0_NVRAM_BASE) & ALTERA_AVALON_SPI_STATUS_TRDY_MSK));

IOWR_ALTERA_AVALON_SPI_TXDATA(SPI_0_NVRAM_BASE, data);

// wait for all bytes to be send

while(!(IORD_ALTERA_AVALON_SPI_STATUS(SPI_0_NVRAM_BASE) & ALTERA_AVALON_SPI_STATUS_TMT_MSK));

// release SS_N

IOWR_ALTERA_AVALON_SPI_CONTROL(SPI_0_NVRAM_BASE, ~ALTERA_AVALON_SPI_CONTROL_SSO_MSK);

}