How to creat a file in SD card using MQX MFS?

botaoyang — Sun, 26 Apr 2015 11:54:00 GMT

I am trying to use MFS to creat a file in SD card ,

I have run the demo project mfs_sdcard twrk60d100m, it does not work; then I add a line

fd_ptr = fopen("a:myfile.txt","w+");

in the project(this is learned from the MQX MFS Manual), this does not work too.

so I am preatty confused of using the MFS to creat a file.

I am using TWR K60D100m, Codewarrior10.6, MQX4.1

Re: How to creat a file in SD card using MQX MFS?

DavidS — Mon, 27 Apr 2015 15:47:01 GMT

Hi Botao,

Please review the C:\Freescale\Freescale_MQX_4_1_1\demo\web_hvac project.

It has option to log data to USB stick but the process would be same if modified to use SD Card.

I'm attaching the logging_task.c file for reference.

Note it uses "a" and not "w+". I think I recall that version of MQX might have had issue with using "w+".

Regards,

David

Re: How to creat a file in SD card using MQX MFS?

botaoyang — Thu, 30 Apr 2015 08:01:22 GMT

Now， I think my problem can be more specific.

By my understanding, the process of using MFS over SD card is like this :

(1) install ESDHC driver;

(2) get the device pointer of SD card;

(3) install MFS over SD card;

(4) use MFS;

In this order, I have write a test MQX project, the main progress is as follows. the test result is I can not open the MFS by using this "MFS_fd = fopen("a:",NULL);", also the MFS installing progress returns a successful result wihout insert a SD card. still creating a file in SD card is failed, even using "a".

I am seeking the cause of this problem desperately, please pay enough attention to my question and give me same useful tips. I am anxious of this , for this problem have delayed the progress of my project.

thank you very much.

FILE_PTR esdhc_fd,MFS_fd;

ESDHC_COMMAND_STRUCT command;

bool sdhc;

_mqx_int error_code;

uint32_t param,rca,sector;

uint8_t buffer[512];

printf("*********************************\n");

printf("******sd card test project*******\n");

printf("*********************************\n");

esdhc_fd = fopen("esdhc:",NULL);

if(NULL==esdhc_fd)

{

printf("open esdhc failed.\n");

}

else

{

printf("open esdhc successed.\n");

}

/* Initialize and detect card */

if (ESDHC_OK != ioctl (esdhc_fd, IO_IOCTL_ESDHC_INIT, NULL))

{

printf("init esdhc failed.\n");

}

else

{

printf("init esdhc successed.\n");

}

/* SDHC check */

sdhc = FALSE;

param = 0;

if (ESDHC_OK != ioctl (esdhc_fd, IO_IOCTL_ESDHC_GET_CARD, &param))

{

printf("find no sd card.\n");

}

if ((ESDHC_CARD_SD == param) || (ESDHC_CARD_SDHC == param) || (ESDHC_CARD_SDCOMBO ==

param) || (ESDHC_CARD_SDHCCOMBO == param))

{

if ((ESDHC_CARD_SDHC == param) || (ESDHC_CARD_SDHCCOMBO == param))

{

sdhc = TRUE;

printf("find a sd card.\n");

}

else

{

/* Not SD memory card */

printf("find no sd card.\n");

}

/* Install MFS over SD card driver */

error_code = _io_mfs_install(esdhc_fd, "a:", (_file_size)0);

if ((error_code != MFS_NO_ERROR)&&(error_code != MFS_NOT_A_DOS_DISK))

{

printf("Error initializing MFS: %s\n", MFS_Error_text((uint32_t)error_code));

}

else

{

printf("intalll MFS over SD card successed.\n");

}

MFS_fd = fopen("a:",NULL);

if(NULL==MFS_fd)

{

printf("open MFS failed.\n");

}

else

{

printf("open MFS successed.\n");

}

fopen("a:myfile.txt","a");

MQX Software SolutionsのトピックHow to creat a file in SD card using MQX MFS?

How to creat a file in SD card using MQX MFS?

Re: How to creat a file in SD card using MQX MFS?

Re: How to creat a file in SD card using MQX MFS?