Forum Discussion

giomate's avatar
giomate
Icon for New Contributor rankNew Contributor
5 years ago

SPI-3-wire SPI_CS pin Configuration

Hi there, Im need to configurate a SPI interface on a Cyclone V. On the deplyment, i did some measurements and i noted that the SPI_SS_N is not toggling, no matter which flags i use. int_result=...
BoonBengT_Altera's avatar
BoonBengT_Altera
Icon for Moderator rankModerator
5 years ago

Hi @giomate,

Good day, just checking in by any chances did you managed to look into the recommendation above.

Please do let us know if you have any difficulties doing so.

Thank you.

Warm regards

BB

giomate's avatar
giomate
Icon for New Contributor rankNew Contributor
5 years ago

hi BoonBeng,

thanks for your support,

at the moment , i got the spi working , when i modified the general SPI transfer function on that way:

void SPI_Handler::Open(void){

IOWR_ALTERA_AVALON_SPI_CONTROL(base_address, ALTERA_AVALON_SPI_CONTROL_SSO_MSK);

}

void SPI_Handler::Close(void){

IOWR_ALTERA_AVALON_SPI_CONTROL(base_address, 0);

}

void SPI_Handler::SEN(bool sen){

if(sen){

IOWR_ALTERA_AVALON_SPI_CONTROL(base_address, 0);

}else{

IOWR_ALTERA_AVALON_SPI_CONTROL(base_address, ALTERA_AVALON_SPI_CONTROL_SSO_MSK);

}

}

however, on higher baudrates(SPI_ADF5610_TARGETCLOCK >4000000u), something is not working...

So , if the system is 80 MHz, how fast can run the SPI?

  • BoonBengT_Altera's avatar
    BoonBengT_Altera
    Icon for Moderator rankModerator
    5 years ago

    Hi @giomate,

    Per my understanding, the SPi core is design to transfer single data word at a time.
    As for the baud rates selection between clock, perhaps you can look at the relationship here.
    Hope that helps.

    Warm regards
    BB

    • BoonBengT_Altera's avatar
      BoonBengT_Altera
      Icon for Moderator rankModerator
      5 years ago

      Hi @giomate,

      Greeting and hope this message find you well, by any chances did you managed to look in documents.

      Please do let us know if there is any clarification we can help with.

      Warm regards

      BB

      • BoonBengT_Altera's avatar
        BoonBengT_Altera
        Icon for Moderator rankModerator
        5 years ago

        Hi @giomate,

        Hope this message find you well and good day, as we do not receive any response from you to the previous clarification that we have provided. Please post a response in the next 15 days to allow me to continue to support you. After 15 days, this thread will be transitioned to community support. The community users will be able to help you with your follow-up questions.

        Warm Regards
        BB