Using SPI on Qsys

Read the SPI section in the embedded peripheral ip user guide (http://www.altera.com/literature/ug/ug_embedded_ip.pdf) - see section 10.

You need to write to the 'txdata' register to send commands to your slave device. This will amount to a number of function calls from your software. So, the data you wish to send will be embedded in your code, thus will end up in whatever memory your software executes from (you don't specifically need to provision the data into that memory). Yes, from what I can see of your Qsys image, it looks like you're running from on-chip memory.

So, to send the 8-bit address (1-byte) plus a further 5 bytes, this (probably) amounts to 6 function calls writing to the txdata register (depending on how your SPI interface peripheral is configured). This should result in the SPI access you're after. Note: make sure you understand the use of the 'TRDY' bit in the status register - you can't just fire 6 bytes at the txdata register.

Cheers,

Alex