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SPI Code Samples

Srinivas Pratapa64690
Prodigy 50 points
Other Parts Discussed in Thread: OMAP3530

I am trying to connect touchscreen controller with OMAP 3530 over SPI.

Can anyone send some code samples that include  SPI configuration, PAD Configuration and to test SPI in loopback mode. 

  • 0
    TI__Mastermind 28045 points

    Srinivas

    Attached is a low level example which setups SPI2 (or SPI1) as a master transmitter/receiver. There is an option to enable a loopback mode.

    I used Code Composer to compile and download via JTAG to the OMAP3530 EVM which was booted to the uboot prompt.

      Paul

    spi_loopback.zip
  • 0 in reply to PaulM
    Prodigy 50 points

     

     

     

     

    Done following pad configuration:

    INPUT_ENABLE                    (1 << 8)
    PULL_INACTIVE                   (0 << 3)
    MUX_MODE_0                      (0 << 0)

    CONTROL_PADCONF_MCSPI2_CLK = (INPUT_ENABLE | PULL_INACTIVE | MUX_MODE_0);

    /*MCSPI2_CLK*/

    CONTROL_PADCONF_MCSPI2_SIMO = (INPUT_ENABLE | PULL_INACTIVE | MUX_MODE_0);

    /*MCSPI2_SIMO*/

    CONTROL_PADCONF_MCSPI2_SOMI = (INPUT_ENABLE | PULL_INACTIVE | MUX_MODE_0);

    /*MCSPI2_SOMI*/

    CONTROL_PADCONF_MCSPI2_CS0 = (INPUT_ENABLE | PULL_INACTIVE | MUX_MODE_0);

    /*MCSPI2_CS0*/

    Is this OK?

  • 0 in reply to Srinivas Pratapa64690
    TI__Mastermind 28045 points

    INPUT_ENABLE                    (1 << 8)
    PULL_INACTIVE                   (0 << 3)
    MUX_MODE_0                      (0 << 0)
    These are correct for the lower half word of the padconf register. The padconf register contains configurations for two pins so the upper half word would be left shifted by and additional 16 bits.  Also, MUX_MODE is a 3 bit field.

    CONTROL_PADCONF_MCSPI2_CLK = (INPUT_ENABLE | PULL_INACTIVE | MUX_MODE_0);
    Settings are correct but this pad configuration is in the upper word [31:16].

    CONTROL_PADCONF_MCSPI2_SIMO = (INPUT_ENABLE | PULL_INACTIVE | MUX_MODE_0);
    There is no need to enable the input for this pad unless you want to do the loopback configuration.

    CONTROL_PADCONF_MCSPI2_SOMI = (INPUT_ENABLE | PULL_INACTIVE | MUX_MODE_0); 
    Settings are correct but this pad but this pad configuration is in the upper word [31:16].

    CONTROL_PADCONF_MCSPI2_CS0 = (INPUT_ENABLE | PULL_INACTIVE | MUX_MODE_0);
    No need to have the input enabled for CS, otherwise ok. 

    For the above, I'm assuming that this is for master mode setup.

      Paul