Table of Contents

Example Summary

Sample application to read and write data onto an SD Card (SPI interface).

Peripherals Exercised

• Board_LED0 - Indicates that the board was initialized within main()
• Board_SDSPI0 - Connection to SD card

Resources & Jumper Settings

Please refer to the development board’s specific Settings and Resources section in the Getting Started Guide. For convenience, a short summary is also shown below.

Fields left blank have no specific settings for this example. For fields containing ^, see the above entry for details

Example Usage

• Run the example. Board_LED0 turns ON to indicate TI-RTOS driver initialization is complete.

• The example proceeds to read the SD card. If the input.txt file is not found, the file is created on the SD card with the following text:

  "***********************************************************************\n"
  "0         1         2         3         4         5         6         7\n"
  "01234567890123456789012345678901234567890123456789012345678901234567890\n"
  "This is some text to be inserted into the inputfile if there isn't     \n"
  "already an existing file located on the SDCard.                        \n"
  "If an inputfile already exists, or if the file was already once        \n"
  "generated, then the inputfile will NOT be modified.                    \n"
  "***********************************************************************\n"

• The input.txt file is then read and it’s contents are written to a new file called output.txt. If the file already exists on the SD card, it will be overwritten.

• The contents of the output.txt file are then written to the console.

Application Design Details

• This application demonstrates how to use TI-RTOS’s SD Card driver to read and write data onto a SD Card using standard CIO runtime system calls (fopen, fread, fwrite, etc…).

• This application uses SysStd instead of SysMin. This was done because real-time was not a concern and the size of the internal SysMin had to be large to hold the output. Please refer to the TI-RTOS User Guide’s Generating printf Output section for a comparison of the different System Support implementations.

This application uses one task:

The fatSDTask performs the following actions:

1. Creates and initializes the SDSPI driver object.

2. Open the input.txt file. If not found, create the file for reading and writing. Write the default message to the file.

3. Open the output.txt file. Content will be overwritten if found.

4. Copy the contents of input.txt to output.txt. Close both files afterwards.

5. Open output.txt, read the file and print the contents to System_printf.

6. The output.txt file and SDSPI driver are closed and the example is terminated.

References

• For GNU and IAR users, please read the following website for details about enabling semi-hosting in order to view console output.