sd_fatfs.c

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/* Includes ------------------------------------------------------------------*/
#include "sd_fatfs.h"
 
#include "log.h"
#include "sd_diskio.h"
#include "sdmmc.h"
 
/* Private variables ---------------------------------------------------------*/
 
static char sdPath[4];
 
/* Functions -----------------------------------------------------------------*/
bool SdCardMount(void)
{
    static FATFS sdFileSystem;
 
    // Message:     A function should have a single point of exit at the end
    //              [misra-c2012-15.5]
    // Reason:      Multiple and early returns are used for avoiding a complex
    //              implementation of checking the results of the intermediate
    //              operations. It also allows better code readability.
    // Risk:        A single point of exit is required by IEC 61508 and ISO
    //              26262 as part of the requirements for a modular approach.
    //              Early returns may lead to the unintentional omission of
    //              function termination code. If a function has exit points
    //              interspersed with statements that produce persistent side
    //              effects, it is not easy to determine which side effects will
    //              occur when the function is executed.
    // Prevention:  Code reviews and testing.
    // cppcheck-suppress-begin [misra-c2012-15.5]
 
    // Initialize the SD card
    if (!SdmmcInit())
    {
        LogPrint("SD card cannot be initialized.\n");
        return false;
    }
 
    // Initialize the FatFs driver
    if (FATFS_LinkDriver(SdDiskIoGetDriver(), sdPath) != 0U)
    {
        LogPrint("FatFs cannot be initialized.\n");
        return false;
    }
 
    /* Mount the SD card */
    if (FR_OK != f_mount(&sdFileSystem, (TCHAR const*)sdPath, 1))
    {
        LogPrint("SD card cannot be mounted.\n");
        return false;
    }
 
    return true;
    // cppcheck-suppress-end [misra-c2012-15.5]
}
 
void SdCardUnMount(void)
{
    (void)f_mount(NULL, (TCHAR const*)sdPath, 0);
    (void)FATFS_UnLinkDriver(sdPath);
    SdmmcDeInit();
}