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Altera_Forum
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16 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
16 years ago

I use something like that 

 IOWR(SPI_CYCLONE3_BASE, ALTERA_AVALON_SPI_TXDATA_REG, tosend);
    while (!(IORD(SPI_CYCLONE3_BASE, ALTERA_AVALON_SPI_STATUS_REG) &  0x0020));
    return IORD(SPI_CYCLONE3_BASE, ALTERA_AVALON_SPI_RXDATA_REG);