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： 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(80);    GUI_Delay(200);    LCD_ON;    if(SD_Init() != 0){        GUI_SetColor(GUI_RED);        GUI_SetFont(&GUI_FontFixedsys16);        GUI_DispStringHCenterAt("SD Error!",480/2,272/2);        while(1);    }    res = f_mount(&fatfs,"0:",1);    if(res != RES_OK){        GUI_SetColor(GUI_RED);        GUI_SetFont(&GUI_FontFixedsys16);        GUI_DispStringHCenterAt("f_mount Error!",480/2,272/2);                while(1);    }        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, 0, 0);    sprintf(buffer,"Is to write and read\r\n");    MULTIEDIT_AddText(hItem,buffer);    memset(buffer,0,sizeof(buffer));    GUI_Exec();    f_open(&file,"0:/test.txt",FA_READ | FA_WRITE | FA_OPEN_ALWAYS);    f_lseek(&file,0);     for(i = 0;i < 512;i++){        write_buffer[i] = i % 256;    }    f_write(&file,write_buffer,512,&counter);                          //将缓冲器中的内容写入源文件        f_lseek(&file,0);                                                     //移动读指针到文件首    f_read(&file,read_buffer,512,&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,0,sizeof(buffer));    sprintf(buffer,"write data:\r\n");    MULTIEDIT_AddText(hItem,buffer);    memset(buffer,0,sizeof(buffer));    for(i = 0;i < 64;i++){        for(j=0;j < 8;j++){            sprintf(buffer," %02X",write_buffer[i*8+j]);                MULTIEDIT_AddText(hItem,buffer);            memset(buffer,0,sizeof(buffer));        }        sprintf(buffer,"\r\n");        MULTIEDIT_AddText(hItem,buffer);        memset(buffer,0,sizeof(buffer));    }    sprintf(buffer,"read data:\r\n");    MULTIEDIT_AddText(hItem,buffer);    memset(buffer,0,sizeof(buffer));    for(i = 0;i < 64;i++){        for(j=0;j < 8;j++){            sprintf(buffer," %02X",read_buffer[i*8+j]);                MULTIEDIT_AddText(hItem,buffer);            memset(buffer,0,sizeof(buffer));        }        sprintf(buffer,"\r\n");        MULTIEDIT_AddText(hItem,buffer);        memset(buffer,0,sizeof(buffer));    }    while(1){        GUI_Exec();    }}