【GMT43智能液晶模块】例程十三：FATFS实验——文件操作

实验原理：

　　STM32F429上带有SDIO控制器，GMT43液晶模块上将SDIO连接到TF卡座。本实验

将Micro SD卡插入TF卡座上即可。通过FATFS创建test.txt文件，并且写入数据0-255，然后

读出并显示在液晶屏上。

示例截图：

源代码下载链接：

链接：https://pan.baidu.com/s/1raoiNl6 密码：5w39

GMT43购买链接：

核心代码：

int main(void)

{

    FRESULT res;

    rcc.initialize();

    ads7843.initialize();

    SDRAM_Init();

    SDRAM_GPIOConfig();

    FMC_SDRAMWriteProtectionConfig(FMC_Bank2_SDRAM,DISABLE);

    lcd_tft.initialize();

    systick.initialize();

    GUI_Init();

    GUI_SetBkColor(GUI_BLACK);

    GUI_Clear();

    pwm.initialize();

    GUI_Delay();

    LCD_ON;

    if(SD_Init() != ){

        GUI_SetColor(GUI_RED);

        GUI_SetFont(&GUI_FontFixedsys16);

        GUI_DispStringHCenterAt("SD Error!",/,/);

        while();

    }

    res = f_mount(&fatfs,"0:",);

    if(res != RES_OK){

        GUI_SetColor(GUI_RED);

        GUI_SetFont(&GUI_FontFixedsys16);

        GUI_DispStringHCenterAt("f_mount Error!",/,/);

        while();

    }

    power_on.check_touch();

    frame.process();

}

static void frame_process(void)

{

    FIL file;                                                                //文件对象

    int i,j;

    unsigned int counter;

    GUI_CURSOR_Show();

    WM_SetCreateFlags(WM_CF_MEMDEV);

    GUI_CreateDialogBox(_aDialogCreate, GUI_COUNTOF(_aDialogCreate), _cbDialog, WM_HBKWIN, , );

    sprintf(buffer,"Is to write and read\r\n");

    MULTIEDIT_AddText(hItem,buffer);

    memset(buffer,,sizeof(buffer));

    GUI_Exec();

    f_open(&file,"0:/test.txt",FA_READ | FA_WRITE | FA_OPEN_ALWAYS);

    f_lseek(&file,);

    for(i = ;i < ;i++){

        write_buffer[i] = i % ;

    }

    f_write(&file,write_buffer,,&counter);                          //将缓冲器中的内容写入源文件

    f_lseek(&file,);                                                     //移动读指针到文件首

    f_read(&file,read_buffer,,&counter);

    f_close(&file);

    MULTIEDIT_SetText(hItem,buffer);                                   //上次显示的文本清空

    sprintf(buffer,"Complete\r\n");

    MULTIEDIT_AddText(hItem,buffer);

    memset(buffer,,sizeof(buffer));

    sprintf(buffer,"write data:\r\n");

    MULTIEDIT_AddText(hItem,buffer);

    memset(buffer,,sizeof(buffer));

    for(i = ;i < ;i++){

        for(j=;j < ;j++){

            sprintf(buffer," %02X",write_buffer[i*+j]);

            MULTIEDIT_AddText(hItem,buffer);

            memset(buffer,,sizeof(buffer));

        }

        sprintf(buffer,"\r\n");

        MULTIEDIT_AddText(hItem,buffer);

        memset(buffer,,sizeof(buffer));

    }

    sprintf(buffer,"read data:\r\n");

    MULTIEDIT_AddText(hItem,buffer);

    memset(buffer,,sizeof(buffer));

    for(i = ;i < ;i++){

        for(j=;j < ;j++){

            sprintf(buffer," %02X",read_buffer[i*+j]);

            MULTIEDIT_AddText(hItem,buffer);

            memset(buffer,,sizeof(buffer));

        }

        sprintf(buffer,"\r\n");

        MULTIEDIT_AddText(hItem,buffer);

        memset(buffer,,sizeof(buffer));

    }

    while(){

        GUI_Exec();

    }

}