1.11 SDMMC Driver Asynchronous - SDMMC Read Write

This example application shows how to use the SDMMC driver in asynchronous mode to perform block operations on the SD Card Media.

Description

  • This example uses the SDMMC driver in asynchronous mode in both Bare-Metal to perform Block Erase/Write/Read operations on SD-Card
  • This application writes 60KB (61440 bytes) of data starting at the SD Card memory location 0x2000
  • It then reads and verifies the written data

Downloading and Building the Application

To clone or download this application from Github, go to the main page of this repository and then click Clone button to clone this repository or download as zip file. This content can also be downloaded using content manager by following these instructions.

Path of the application within the repository is apps/driver/sdmmc/async/sdmmc_read_write/firmware.

To build the application, refer to the following table and open the project using its IDE.

Project NameDescription
sam_9x75_curiosity.XMPLABX project for SAM9X75 Curiosity Development Board

Setting Up AT91Bootstrap loader

To load the application binary onto the target device, we need to use at91bootstrap loader. Refer to the at91bootstrap loader documentation for details on how to use it to bootstrap the application binaries.

Setting Up the Hardware

The following table shows the target hardware for the application projects.

Project NameDescription
sam_9x75_curiosity.XSAM9X75 Curiosity Development Board

Setting Up SAM9X75 Curiosity Development Board

Additional hardware required:
  • SD Card with FAT32 file system
Setting up the board:
  • SDMMC slot used is SD BOOT (J14)
  • Connect the UART DEBUG J35 on board to the computer using a UART-FTDI cable (to enable debug com port)
  • Connect the USB port J2 on board to the computer using a micro USB cable (to power the board)

Running the Application

  1. Build the application using its IDE
  2. The LED is turned ON when the read data from the SD Card matches with the written data
Refer to the following table for LED name:
BoardLED Name
SAM9X75 Curiosity Development BoardRGB_LED (Green)