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Altera_Forum's avatar
Altera_Forum
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15 years ago

Nios2 SPI

Hi, I'm having some trouble reading from my IO expander with the SPI core from Altera :confused: Can anybody provide me with an example on how to issue a correct read to the spi inter...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

and how would that work without the standard command?

I'm an altera newbee and have the same problem.

i need to send 7 bit reg-addr.+1bit r/w and 16 bit data

I'm trying with 

 
#include
<altera_avalon_spi_regs.h>
#include <altera_avalon_spi.h>
 
 
main{
int test;
 
while (!(IORD_ALTERA_AVALON_SPI_STATUS(SPI_BASE) & ALTERA_AVALON_SPI_STATUS_TRDY_MSK));
 
IOWR_ALTERA_AVALON_SPI_TXDATA(SPI_BASE, 0xFFFF);
 
while (!(IORD_ALTERA_AVALON_SPI_STATUS(SPI_BASE) & ALTERA_AVALON_SPI_STATUS_TRDY_MSK));
 
test=IORD_ALTERA_AVALON_SPI_RXDATA(SPI_BASE);
 
 
 
 
}

but the thinks i write dont match with the read data... :(

Any help?