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TM4C1294NCPDT: SSI Code for direct Register configuration

Vijay Balaji
Prodigy 130 points
Part Number: TM4C1294NCPDT

Hi,

I want direct register configuration for SPI configure in TM4C1294NCPDT controller.

Any example code is suggest me.

Thanks & Regard,

Vijay

  • 0
    TI__Guru**** 191886 points

    Hi,

     We provide TivaWare SDK with peripheral drivers to abstract users from the hardware. We don't have any examples that use DRM (direct register manipulation) style of coding. However, you can easily look at any one of the SPI API source code to understand how SPI registers are used for operations. You can also refer to the datasheet. The device datasheet contains the full registers description. It is a matter of writing and reading the registers at their specified addresses. Below is a snippet of code to write data to the SPI data register. Refer to C:\ti\TivaWare_C_Series-2.2.0.295\driverlib\ssi.c file. 

    void
SSIDataPut(uint32_t ui32Base, uint32_t ui32Data)
{
    //
    // Check the arguments.
    //
    ASSERT(_SSIBaseValid(ui32Base));
    ASSERT((ui32Data & (0xfffffffe << (HWREG(ui32Base + SSI_O_CR0) &
                                       SSI_CR0_DSS_M))) == 0);

    //
    // Wait until there is space.
    //
    while(!(HWREG(ui32Base + SSI_O_SR) & SSI_SR_TNF))
    {
    }

    //
    // Write the data to the SSI.
    //
    HWREG(ui32Base + SSI_O_DR) = ui32Data;
}

  • 0 in reply to Charles Tsai
    Prodigy 130 points

    Hi Charles,

    I am aware of the availability of APIs and how they operate. However, when I examined the API code, I discovered that the register address differed significantly from the datasheet's direct register address.

    How can I use DRM (direct register manipulation) to send and receive data and configure SPI (SSI)? What are the specific steps in the process?

    Thanks & Regards,

    Vijay

  • 0 in reply to Vijay Balaji
    TI__Guru**** 191886 points

    The base addresses for QSSI modules are listed in the datasheet.  You need to use these registers. They are matching the hw_memmap.h file. 

  • 0 in reply to Charles Tsai
    Prodigy 130 points

    Hi Charles,

    What are the Steps to follow to Configure the SSI Register?
    can you explain the Step by step Register Configure method?

    Thanks & Regards,

    Vijay

  • 0 in reply to Vijay Balaji
    TI__Guru**** 191886 points

    Why don't you run a simple example in C:\ti\TivaWare_C_Series-2.2.0.295\examples\peripherals\ssi\spi_master.c and single step through the source code and it gives you step by step how the APIs use DRM to setup all the registers. 

    Just to give you a simple example to write to a register. Let's say you want to write a random value 0x1234 to the SSIDR register in the SSI0 module. 

    HWREG(SSI0_BASE + SSI_O_DR) = 0x1234; 

  • 0 in reply to Charles Tsai
    Prodigy 130 points

    Hi Charles,

    Thanks for helping.

    Regards,

    Vijay