3.6.4.23 microSD Click Example on SAM E51 Curiosity Nano Evaluation Kit

Description

This application showcases the capabilities of the microSD Click module. It demonstrates various file operations that can be performed on an SD card.

• Creating a file
• Writing data to the file
• Reading data from the file
• Creating a directory

These operations are accomplished using the MPLAB Harmony File System, SDSPI driver, and SPI PLIB.

1. Create a file and write data to it
   • The application creates a file named "mchp_sd.txt"
   • The file is opened in write mode
   • A text message is written to the file
2. Create a directory and read data from a file
   • The application creates a directory named Dir1 in the root directory
   • A new file named "mchp_sd2.txt" is created inside "Dir1"
   • The content of "mchp_sd.txt" is read and copied into "mchp_sd2.txt"

• SDSPI Driver to communicate to SD Card over SPI interface

Modules/Technology Used

Hardware Used

Software/Tools Used

This project has been verified to work with the following versions of software tools:

Refer Project Manifest present in harmony-manifest-success.yml under the project folder firmware/src/config/sam_e51_cnano.

• Refer the Release Notes to know the MPLAB X IDE and MCC Plugin version.

Because Microchip regularly updates tools, occasionally issue(s) could be discovered while using the newer versions of the tools. If the project does not seem to work and version incompatibility is suspected. It is recommended to double-check and use the same versions that the project was tested with. To download original version of MPLAB Harmony v3 packages, refer to document How to Use the MPLAB Harmony v3 Project Manifest Feature (DS90003305).

Setup

Programming Hex File

The pre-built hex file can be programmed by following the below steps.

Programming/Debugging Application Project

Running the Demo

• After power up, when the demo is running, The microSD-click shows as below.

  

• Once the application successfully creates "mchp_sd.txt" and "Dir1/mchp_sd2.txt" LED0 on the board will light up.

The success of the following file operations can be verified by connecting the SD card to a PC and examining the contents of "mchp_sd.txt" and "Dir1/mchp_sd2.txt." The contents should match in order to consider them successful:

• Creating a file
• Writing data to the file
• Reading data from the file
• Creating a directory

Instructions to Add microSD Click Functionality to the Application

The user could use this demonstration as an example to add microSD Click functionality to the MPLAB Harmony v3 based application. Follow the below steps.

1. If the user has not downloaded the microSD Click demo yet Click Here to download, otherwise go to next step.
2. Unzip the downloaded .zip file.
3. From the unzipped folder microsd/firmware/src, copy the folder click_routines to the folder firmware/src under the MPLAB Harmony v3 application project.
4. Open MPLAB X IDE.
5. Open the application project.
6. In the project explorer, right click on folder Header Files and add a sub folder click_routines by selecting Add Existing Items from Folders...

   

7. Click on Add Folder... button.

   

8. Select the click_routines folder and select Files of Types as Header Files.

   

9. Click on Add button to add the selected folder.

   

10. The microSD-click example header files gets added to the project.

    

11. In the project explorer, right click on folder Source Files and add a sub folder click_routines by selecting Add Existing Items from Folders...

    

12. Click on Add Folder... button.

    

13. Select the click_routines folder and select Files of Types as Source Files.

    

14. Click on Add button to add the selected folder.

    

15. The microSD-click example source files gets added to the project.

    

16. The microSD Click example uses the SPI, SDSPI Driver,TC0 peripherals and PORT pins. The configuration of these peripherals for the application depends on the 32-bit MCU and development board the user is using.
    • Configure SPI:
      • Add the SPI peripheral block to the MCC project graph.
      • Configure SPI Pins using MCC Pin configuration Window.
        The SPI configuration depends on:

        • 32-bit MCU
        • 32-bit MCU development board
        • The socket on which the user has mounted the microSD-click board

          Example: The microSD-click example on SAM E51 Curiosity Nano Evaluation Kit uses mikroBUS socket #1 on the Curiosity Nano Base for Click boards to mount the microSD-click board. The SPI lines from MCU coming to this socket are from the SERCOM1 peripheral on the MCU.

          

          

    • Configure SDSPI Driver:
      • Add the SDSPI Driver peripheral block to the MCC project graph.
      • Add Instance 0 to the SDSPI Driver block and connect SERCOM 1 and File System to Instance 0.

      

    • Configure File System:
      • Add the File System block to the MCC project graph.

      

    • Configure Timer:
      • Configure Timer peripheral block in the MCC project graph.
        The Timer configuration depends on:

        • 32-bit MCU

          Example: The microSD-click example on SAM E51 Curiosity Nano Evaluation Kit uses TC0 timer module on the MCU to implement the time requirement of microSD-click routines.

          

          

    • Configure Core:
      • Add the Core block to the MCC project graph.

        

    • Configure PORT Pins:
      • Configure PORT pins needed by microSD-click in the MCC Pin Configurator.
        The PORT pin configuration depends on:

        • 32-bit MCU
        • 32-bit MCU development board
        • The socket on which the user has mounted the microSD-click board

          Example: The PORT pin configuration for the microSD-click example on SAM E51 Curiosity Nano Evaluation Kit is below.

          

    The click_routines folder contain an example C source file microsd_example.c. The user could use microsd_example.c as a reference to add microSD-click functionality to the application.

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