EMMC in EC200U-EU

IoT Modules LTE Standard Module
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Hi everyone,
I have a few questions about the SDC interfaces on the EC200U module.

  1. Are the pin functions of SDC1 and SDC2 different from each other?
    In the LTEOPENEVBKit reference board, I noticed that SDC1 is connected to the Wi-Fi module, while SDC2 is connected to the eMMC.
    Does this mean that each interface is dedicated to specific peripherals, or can they be used interchangeably based on configuration?
  2. Are the eMMC connections on the EC200U electrically similar to standard SD card connections**? In other words, is the SDC interface for eMMC wired the same way as for SD card usage?
  3. Could someone please provide an example code for accessing eMMC on the EC200U?
    I’ve tried several approaches but I’m not getting any output or successful initialization.

Thanks!

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@fuguiwang-Q Please help to look into this issue.

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  1. Are the pin functions of SDC1 and SDC2 different from each other?
    In the LTEOPENEVBKit reference board, I noticed that SDC1 is connected to the Wi-Fi module, while SDC2 is connected to the eMMC.

Reply：In LTE OPENCPU EVB KIT, there are two interface channels, one of which is connected to WIFI and the other is connected to SD card or EMMC.
Whether these two interface channels can be used requires confirmation of the connected TE_A KIT. Confirm the support for WIFI or SD card through the TE_A Kit. For the TE_A KIT of EC200U module, only SD card is used, so only SD card or EMMC can be debugged on LTE OPENCPU EVB KIT and EC200U TE_A KIT.

Does this mean that each interface is dedicated to specific peripherals, or can they be used interchangeably based on configuration?
REPLY:NO,The hardware channel is fixed and cannot be changed.

  1. Are the eMMC connections on the EC200U electrically similar to standard SD card connections**? In other words, is the SDC interface for eMMC wired the same way as for SD card usage?
    Reply：
    Yes, their interface connection line definitions are the same. But their electrical characteristics are different. Software configuration is required.
    In addition, in LTEOPENCPUKIT, it is necessary to control the U0701 switch to control the channel and confirm whether the SDIO interface of EC200U is connected to EMMC or SD

  2. Could someone please provide an example code for accessing eMMC on the EC200U?
    I’ve tried several approaches but I’m not getting any output or successful initialization.
    Reply:
    What you need to obtain is software code documentation. It is recommended to contact Quectel’s sales team to obtain support for the corresponding FAE, or obtain information on the OPENCPU software forum