Library Description

The library covers all the necessary functions for the usage of the microSD Click board. It holds card detection function.

Key functions:

• uint8_t microsd_cardDetection() - Function checks if the user has inserted the memory card.

Examples description

The application is composed of the three sections :

• System Initialization - Initializes SPI module, LOG and GPIO structures, sets CS pin as output and AN pin as input.
• Application Initialization - Initalizes SPI driver and makes an initial log.
• Application Task - This is an example that shows the capabilities of the microSD click board by reading CID and CSD values of a memory card and logging them on USART terminal.

void applicationTask()
{
    mikrobus_logWrite( "", _LOG_LINE );
    mikrobus_logWrite( "________________________", _LOG_LINE );
    mikrobus_logWrite( "  Begin demonstration!  ", _LOG_LINE );
    mikrobus_logWrite( "", _LOG_LINE );

    mikrobus_logWrite( "  Insert  microSD  Card ", _LOG_LINE );
    mikrobus_logWrite( "------------------------", _LOG_LINE );

    if( microsd_cardDetection() )
    {
        mikrobus_logWrite( "Memory card not detected", _LOG_LINE );
        mikrobus_logWrite( "------------------------", _LOG_LINE );
    }
    else
    {
        mikrobus_logWrite( " Memory  card  detected ", _LOG_LINE );
        mikrobus_logWrite( "------------------------", _LOG_LINE );
        mmcErr = Mmc_Init();
        if( mmcErr == 0 )
        {
            mikrobus_logWrite( "     MMC  Init-OK     ", _LOG_LINE );
            mikrobus_logWrite( "------------------------", _LOG_LINE );
            mmcErr = Mmc_Read_Cid( regVal );
            if( mmcErr == 0 )
            {
                mikrobus_logWrite( "CID : ", _LOG_TEXT );
                for( i = 0; i <= 15; i++ )
                {
                    IntToHex( regVal[ i ], logTxt );
                    mikrobus_logWrite( logTxt, _LOG_TEXT );
                }
            mikrobus_logWrite( "", _LOG_LINE );
            mikrobus_logWrite( "------------------------", _LOG_LINE );
            }
            else
            {
                mikrobus_logWrite( "    CID-error    ", _LOG_LINE );
                mikrobus_logWrite( "------------------------", _LOG_LINE );
            }
            mmcErr = Mmc_Read_Csd( regVal );
            if(mmcErr == 0)
            {
                mikrobus_logWrite("CSD : ", _LOG_TEXT);
                for( i=0; i <= 15; i++ )
                {
                    IntToHex( regVal[ i ], logTxt  );
                    mikrobus_logWrite( logTxt, _LOG_TEXT );
                }
                mikrobus_logWrite("", _LOG_LINE );
                mikrobus_logWrite( "------------------------", _LOG_LINE );
            }
            else
            {
                mikrobus_logWrite("    CSD-error    ", _LOG_LINE );
                mikrobus_logWrite( "------------------------", _LOG_LINE );
            }
         }
        else
        {
            mikrobus_logWrite( "   MMC  Init-error   ", _LOG_LINE );
            mikrobus_logWrite( "------------------------", _LOG_LINE );
        }

    mikrobus_logWrite( "  Demonstration  over!  ", _LOG_LINE );
    mikrobus_logWrite( "________________________", _LOG_LINE );
    mikrobus_logWrite( "", _LOG_LINE );
    Delay_ms( 5000 );
}

Additional Functions :

• Mmc_Init() - Initializes MMC through hardware SPI interface.
• Mmc_Read_Cid( regVal ) - The function reads 16-byte CID register.
• Mmc_Read_Csd( regVal ) - The function reads 16-byte CSD register.

Other mikroE Libraries used in the example:

• SPI
• Mmc
• Mmc_FAT16
• UART
• Conversions

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 click or RS232 click to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.