1 Reply Latest reply on Apr 3, 2020 1:15 AM by GaneshD_41

    SPI Slave Select not being applied

    KaAn_4627896

      Hi!

       

      I'm trying to use the Cypress API SPI_1_SetActiveSlaveSelect-function, on a CY8C6347BZI-BLD54 using PSoC Creator 4.2 with PDL 3.1.1.

      The component name are SCB_SPI_PDL_v2_0.

      When I select m_ss1 it seems to not be applied on the corresponding hardware pin.

      The SPI component is located in SCB7, and the SCB7_SPI_CTRL register should be located at address 0x40680020 according to the datasheet.

      After I've run the following code snippet for selecting m_ss1 (SPI1_LED_CS) I get this result in the control register:

       

      while (SPI_1_IsBusBusy());
      SPI_1_SetActiveSlaveSelect(SPI_1_SPI_SLAVE_SELECT1);
      
      10000100 00000000 00000000 00000001
          ||
        SSEL[0-3]
      

       

      But SPI1_LED_CS does not go low when writing data to the SPI bus, strange enough.

      When I disconnect SPI1_DO_CS and SPI1_LED_CS from the SPI controller and control them manually it works just as expected.

      So the question is if I'm missing something here?

      SPI.PNG

        • 1. Re: SPI Slave Select not being applied
          GaneshD_41

          Hi,

           

          >>"But SPI1_LED_CS does not go low when writing data to the SPI bus, strange enough.

          --> Can you please tell us how are you testing this? Is the SPI write does not happening? Or have you seen the scope signal of the SS line?

           

          >>"When I disconnect SPI1_DO_CS and SPI1_LED_CS from the SPI controller and control them manually it works just as expected.

          So the question is if I'm missing something here?"

          --> Can you please elaborate what do you mean by "control them manually"? By disconnecting do you mean are you removing the connections of wires on the pins SPI1_DO_CS and SPI1_LED_CS?

           

          --> Have you tested SPI_Master_polling code example from the PSoC Creator Code example section? Is it working on your board? If not, can you please test it now?

           

          Thanks

          Ganesh