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SPI 1 Chip Select and eHRPWM in OMAP-L138

Subramanian R
Prodigy 30 points
Other Parts Discussed in Thread: OMAP-L138, OMAPL138

Hi,

We are planning to use eHRPWM outputs in OMAP-L138 as PWM outputs for 4 Wire-Stepper Motor interface. This eHRPWM outputs are multiplexed with SPI 1 and SPI 0 interface. Another requirement is to configure OMAP-L138 as SPI 1  Slave interface with CS4.

Actually, SPI 1 interface CS 0/1 is used as eHRPWM outputs. SPI 1 CS 2/3 is used as UART 1 interface which we use as debug port. The next available Chip select is SCS4 and we are configuring OMAP as SPI - Slave.

Kindly confirm whether this configuration is feasible. We understand Pin MUX registers allow individual ChipSelect configuration for OMAP SPI 1 interface.

Thanks and Regards

R.Subramanian

  • 0
    TI__Mastermind 43660 points

    Hello Subramanian,

    Welcome to the TI E2E forum. I hope you will find many good answers here and in the TI.com documents and in the TI Wiki Pages (for processor issues). Be sure to search those for helpful information and to browse for the questions others may have asked on similar topics (e2e.ti.com).

    Actually, SPI 1 interface CS 0/1 is used as eHRPWM outputs. SPI 1 CS 2/3 is used as UART 1 interface which we use as debug port. The next available Chip select is SCS4 and we are configuring OMAP as SPI - Slave.

    Yes, this configuration is possible on OMAPL138. As you mentioned above, it could be implemented with the use of pinmux registers. Please refer section 11.5.10 Pin Multiplexing Control Registers (PINMUX0-PINMUX19) in device TRM.

    Further you can use any of the eight chip selects of SPI1 interface to access the SPI slave connected to this bus.

    Regards,

    Senthil

  • 0 in reply to Senthilkumar Srinivasan
    Prodigy 30 points
    Dear Senthil,
    Thanks for your reply. Is it possible to have SPI 1 as Bus master with SCS4 as chip select? Other chip selects are used for eHRPWM , UART, I2C0 etc.

    Thanks and Regards,
    R.Subramanian
  • 0 in reply to Subramanian R
    TI__Mastermind 43660 points
    Hello Subramanian,

    Yes, you can use SPI1 as bus master with SCS4 as chip select to access the SPI slave.

    Regards,
    Senthil