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Altera_Forum's avatar
Altera_Forum
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14 years ago

SPI Problems

Hi, I'm trying to get handle with the SPI on a Nios II Core but I don't get it. I have a SPI master and a SPI Slave that I can try to transmit some data from the master to the slave. I connecte...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

Hi siedler2011,

I'm facing the same problems that you've already faced. I'm implementing an SPI Slave Controller on my DE1-SOC Altera Board. My master is represented by a Microcontroller that should send data to DE1-SOC board. i'm obtaining the same values that you've obtained for the status register. "Statusregister of the Slave: 0x310".

I'm using this code to implement the slave SPI Controller on my board:

int main(void)

{

alt_u32 rddata=0x0;

alt_u32 status;

IOWR_ALTERA_AVALON_SPI_STATUS(SPI_BASE,0x0000);

IOWR_ALTERA_AVALON_SPI_TXDATA(SPI_BASE,0x1001);

IORD_ALTERA_AVALON_SPI_RXDATA(SPI_BASE);

while(1)

{

do

{

status = IORD_ALTERA_AVALON_SPI_STATUS(SPI_BASE);

}

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

(status & ALTERA_AVALON_SPI_STATUS_RRDY_MSK) == 0);

rddata= IORD_ALTERA_AVALON_SPI_RXDATA(SPI_BASE);

IOWR_ALTERA_AVALON_SPI_TXDATA(SPI_BASE, rddata);

}

Do you think it could work? I think i ve the same problems that you had with the SS_n signal. Could you help me ? Could you provide me code that you've used on your board set as SLAVE in the communication ?

Thanks