SPI Problems - Page 2

Altera_Forum · ‎01-13-2012

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 connected them with the "loopback board".

My Code is:

//Write some data to the Slave
IOWR_ALTERA_AVALON_SPI_SLAVE_SEL(SPI_SLAVE_BASE,0x04);
//Check the TRDY bit if data is written(TRDY=0 means it is writing and
//TRDY=1 again means the data was written)
trdyNumber=(IORD_ALTERA_AVALON_SPI_STATUS(SPI_SLAVE_BASE)& ALTERA_AVALON_SPI_STATUS_TRDY_MSK)>>6;
//Read from the register
int data=(IORD_ALTERA_AVALON_SPI_RXDATA(SPI_SLAVE_BASE)&0xFF);
printf("%d",data);

I also read the manuel for the SPI Core but it doesn't work. Can somebody help my with an exsample or give me an advice?

Regards

Altera_Forum · ‎10-21-2013

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I changed the waiting completion loop like you told me and it doesn't work. I also tried instead to wait on the TRDY-Flag to wait on the RRDY-Flag because how far I understand if the RRDY-Flag is "1" it is possible to read the register. But it also doesn't work.

I`m also checked the setup in QSYS of the both SPI Cores and till the difference that one is a master and the other one is a slave they have the same setting in relation to the clock polarity and phase. So may I change the setting for the slave or the master? Or what can I do farther?

Thanks in advance for your help!

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Did You find the solution to Your problem?

Altera_Forum · ‎04-26-2017

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