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Card detect in MMC module if no switch is used

Patrick Ruf
Genius 4965 points

Hi,

If no pin of the AM335x is muxed to the "mmcx_sdcd" signal (Card Detect) of a MMC module (like on a AM335x ICE board)  what level does the bit "CINS" respective the bit "CDPL" in the register "SD_PSTATE" reflect?

I ask this question because the bootloader in StarterWare will check if card is inserted (if (MMCSDCardPresent(&ctrlInfo)==0)).

Thanks.
Best regards,
Patrick

  • 0
    TI__Intellectual 1480 points

    Hi,

    To use Card Detect of MMC module the mmc0_sdcd pin has to be pinmuxed as below. Otherwise the behaviour is not consistent and reliable. Please refer to the example hs_mmcsd for pin mux details or below is the pinmux configuration for mmc0_sdcd pin.

         HWREG(SOC_CONTROL_REGS + CONTROL_CONF_SPI0_CS1) =
                       (5 << CONTROL_CONF_SPI0_CS1_CONF_SPI0_CS1_MMODE_SHIFT)    |
                       (0 << CONTROL_CONF_SPI0_CS1_CONF_SPI0_CS1_PUDEN_SHIFT)    |
                       (1 << CONTROL_CONF_SPI0_CS1_CONF_SPI0_CS1_PUTYPESEL_SHIFT)|
                       (1 << CONTROL_CONF_SPI0_CS1_CONF_SPI0_CS1_RXACTIVE_SHIFT);

    Thanks for point out the issue and will be corrected in next release.

    Regards,

    Ramesh D