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HIGH SPEED SPI (HSSPI) TMS320F2837xD

Arcadio Perilla
Prodigy 20 points
Other Parts Discussed in Thread: CONTROLSUITE

Hi. I'd like to know Why example 17-3 Datasheet TMS320F2837xD (2396 pages) say " Baud Rate Calculation in Non-High Speed Mode (HS_MODE=0)" and they are using LSPCLK = 50MHz.

Doesnt HSSPI mean max. freq LSPCLK = 40MHz?

Thks

  • 0
    TI__Guru 60865 points

    Hi Arcadio,

    The 40MHz limitation is actually on the SPICLK.  LSPCLK is common to other communications peripherals like McBSP and can be up to 200MHz. To get 40MHz SPICLK, you will want to set the LSPCLK to 200MHz:


  • 0 in reply to Devin Cottier
    Prodigy 60 points

    Hi,Devin

    I check the SPICCR register (page 1900 of 2396 in the TRM -spruhm8c),but I cannot find the bit of HS_MODE,any mistake?

  • 0 in reply to sewking
    TI__Guru** 109125 points

    You are right. This bit field is missing in SPICCR register in TRM as well as in header file. This will be corrected in next release of TRM and controlSUITE which is planned towards the end of this month. 

    Following should be SPICCR register definition -

    struct SPICCR_BITS {                    // bits description
        Uint16 SPICHAR:4;                   // 3:0 Character Length Control
        Uint16 SPILBK:1;                    // 4 SPI Loopback
        Uint16 HS_MODE:1;                   // 5 High Speed mode control
        Uint16 CLKPOLARITY:1;               // 6 Shift Clock Polarity
        Uint16 SPISWRESET:1;                // 7 SPI Software Reset
        Uint16 rsvd1:8;                     // 15:8 Reserved
    };

    Regards,

    Vivek Singh