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Altera_Forum
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13 years ago

SPI with NIOS2 in qsys

Hi, I want to implement SPI in Qsys with one side NIOS 2. Well in SPI core of altera there is a function " int alt_avalon_spi_command(alt_u32 base, alt_u32 slave,alt_u32 write_length,c...
Altera_Forum's avatar
Altera_Forum
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13 years ago

Hi,

Have a look at the data sheet for the SPI memory you're using. You'll find that the write requires you to send at least two bytes, but for this example let's assume it's just two. The first would be the address and the second the byte to write to that address. With a read you send a byte as the address and then read one as the response. The NIOS has no idea what's out there on your SPI bus so it's up to you to send (and receive) the bytes required by your memory or other SPI devices.

Mark.