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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
14 years ago

Your code contains several mistakes:

IOWR_ALTERA_AVALON_SPI_SLAVE_SEL(SPI_SLAVE_BASE,0x04)

This doesn't write data to the slave, but it selects (enables) slave whose address is 4 for receiving data

SPI slave is not supposed to transmit data autonomously. It sends data upon

reception of a master request.

You both send and receive data on slave.

I think you meant send with master and receive with slave.