eMMC integration

[shilpa]

I need to  incorporate eMMC in my code.But heard  that it is not compatible in nrf52. So I would like to know how to include eMMC code right from the beginning the algorithm ,working, codes etc..What should be done to avoid the non compatibility with sdk? Is there any libraries available for eMMC?

[Einar Thorsrud]

Hi,

The SDK does not have any specific support for eMMC. It has support for SD cards and MMC (version 3) via SPI, though. Perhaps some other forum members have some advice or a eMMC implementation they are willing to share?

[shilpa]

Hi,

Thanks for the reply. I heard eMMC can be interfaced by SDIO. Since SDIO .h and.c files are there in SDK , can we use those set of files for the programming ? You have mentioned some forum members for the advice, could you please specify those?

[Einar Thorsrud]

Hi,

You are right that the SDK has a SDIO driver, but no eMMC example. I am not aware of any specific forum members with eMMC experience, but with some luck some will see this thread. If not, I suggest you develop your own implementation (possibly using the SDIO driver).

[shilpa]

Hi,

In BMD300 block diagram there is no SDIO module.So will it be able to use SDIO .c and .h files for developing codes

[Einar Thorsrud]

You can still use the SDIO driver. There is no specific SDIO peripheral on the nRF52, all the driver does is to bit bang GPIOS.

[shilpa]

Hi,

For the application of eMMC, there are several other pins such as CMD,QRDY etc..which is not being used in SDIO driver. So how will it be possible ???

[Einar Thorsrud]

I would be surprised if it was not possible, but as mentioned we do not have any eMMC driver, so you will have to make it yourself.

[shilpa]

So it means that for eMMC incorporation in nrf52 SDIO drivers cannot be used and we have to create another eMMC driver our self right???

[Einar Thorsrud]

I suspect you can reuse something from the SDIO driver, but I don't have any experience with eMMC so I cannot guarantee anything. In any case the bottom line is that Nordic does not have any specific support for eMMC so you have to implement it yourself (in any way you see fit).