topic Re: k70 with MQX 4.1 . SD card read issue (For bigger file Size > 1MB) in MQX Software Solutions

k70 with MQX 4.1 . SD card read issue (For bigger file Size > 1MB)

sohamd — Fri, 24 May 2019 04:46:14 GMT

I am trying to read data from SD card (Sandisk 4 GB) using eSDHC driver . I am not able to read complete file if file size is more than 1 MB..

I tried below:

1) decrease the speed in the sdhc conf structure (mqx/bsp/<board>/init_sdhc0.c file).

const ESDHC_INIT_STRUCT _bsp_esdhc0_init = {

0, /* ESDHC device number */

25000000, /* ESDHC baudrate */ >>>>>>>>>>>>>>> change this to the 4000000 <<<<<<<<<<

BSP_SYSTEM_CLOCK /* ESDHC clock source */

};

Also change to baudrate = 10000000, baudrate = 1000000, baudrate = 100000, baudrate = 10000, baudrate = 1000, baudrate = 100 .

if (ESDHC_OK != ioctl (sdcard_ptr->COM_DEVICE, IO_IOCTL_ESDHC_GET_BAUDRATE_MAX, &baudrate))

{

return FALSE;

}

//baudrate = 10000000; <-- Here i did the change

if (param > baudrate)

{

param = baudrate;

}

if (ESDHC_OK != ioctl (sdcard_ptr->COM_DEVICE, IO_IOCTL_ESDHC_SET_BAUDRATE, &param))

{

return FALSE;

}

2) disable and enable interrupt

In esdhc_read() beginning at around line 1554:

#if ESDHC_IS_HANDLING_CACHE
_int_disable();
if (head_len)
{
_DCACHE_INVALIDATE_LINE(head);
_mem_copy(head, data_ptr, head_len);
}
if (body_len)
{
_DCACHE_INVALIDATE_MBYTES(body, body_len);
}
if (tail_len)
{
_DCACHE_INVALIDATE_LINE(tail);
_mem_copy(tail, ((uint8_t *)data_ptr) + head_len + body_len, tail_len);
}
_int_enable();
#endif
{
_DCACHE_INVALIDATE_LINE(tail);
_mem_copy(tail, ((uint8_t *)data_ptr) + head_len + body_len, tail_len);
}

In esdhc_write() beginning at around line 1692:

_int_disable();
/* Flush caches */
if (head_len)
{
_mem_copy(data_ptr, head, head_len);
_DCACHE_FLUSH_LINE(head);
}
if (body_len)
{
_DCACHE_FLUSH_MBYTES(body, body_len);
}
if (tail_len)
{
_mem_copy(((uint8_t*)data_ptr) + head_len + body_len, tail, tail_len);
_DCACHE_FLUSH_LINE(tail);
}
_int_enable();

But still no luck ..

Can anyone please help me where I am doing wrong / or any other solutions ??

Re: k70 with MQX 4.1 . SD card read issue (For bigger file Size > 1MB)

danielchen — Tue, 28 May 2019 07:09:39 GMT

Hi soham:

This issue maybe related with MQX-4146.

It is a known issue that MQX 4.1 has some MFS issues.

I woulds suggest you update to MQX 4.2, and patch MQX 4.2.0.2.

I hope it helps

Regards

Daniel

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Re: k70 with MQX 4.1 . SD card read issue (For bigger file Size > 1MB)

sohamd — Tue, 28 May 2019 07:55:34 GMT

Thanks for your reply.

Unfortunately In our project we can not update MQX 4.2 immediately .

Can you tell me the changes /(file name ). I am trying to compare the difference in between 4.1 and 4.2

It will be great if you can tell me the specific file/files name regarding this bug fix

Re: k70 with MQX 4.1 . SD card read issue (For bigger file Size > 1MB)

sohamd — Tue, 28 May 2019 08:18:50 GMT

Also my problem is very sporadic .. it will fail after 20-30 times of file read write

Re: k70 with MQX 4.1 . SD card read issue (For bigger file Size > 1MB)

danielchen — Tue, 28 May 2019 08:30:29 GMT

Hi Soham:

You can compare below folder.

Freescale_MQX_4_2\mfs\source

Sorry I don't know the exact files.

Regards

Daniel

Re: k70 with MQX 4.1 . SD card read issue (For bigger file Size > 1MB)

sohamd — Tue, 28 May 2019 08:34:28 GMT

Thanks :smileyhappy: .

I will check and post my result

Re: k70 with MQX 4.1 . SD card read issue (For bigger file Size > 1MB)

sohamd — Tue, 28 May 2019 12:48:53 GMT

Hi Daniel ,

I can see in 4.1 ,

file name mfs_init.c function name _io_mfs_write() line number , approx. 813 ..looks like

#if MQX_USE_IO_OLD
    file_ptr->ERROR = errcode;
    /* Check for EOF. The MFS EOF must be translated to the standard EOF */
    if (result == MFS_NO_ERROR && errcode == MFS_EOF)
    {
        file_ptr->FLAGS |= IO_FLAG_AT_EOF;
        /* Update the file size in the old IO structure */
        file_ptr->SIZE = handle->SIZE; <------ here update the file_ptr size
    }

return (errcode == 0 || errcode == MFS_EOF) ? result : IO_ERROR;

4.2

the file size updated by

    /* Update location and file size in the FIO structure - legacy compatibility */
    file_ptr->LOCATION = handle->LOCATION;
    file_ptr->SIZE = handle->DIR_ENTRY->FILE_SIZE;

    /* Check for EOF. The MFS EOF must be translated to the standard EOF */
    if (result == 0 && errcode == MFS_EOF)
    {
        file_ptr->FLAGS |= IO_FLAG_AT_EOF;
    }

I took the changes , but still not resolves my issue ...approx. 20-30 iteration ,my file read operation is failing .

Any idea ?

Re: k70 with MQX 4.1 . SD card read issue (For bigger file Size > 1MB)

danielchen — Thu, 30 May 2019 06:47:25 GMT

I would suggest you first test this issue with MQX 4.2, and patch. If this version fixed this issue, then you can merge this fix to your code.

Regards

Daniel

Re: k70 with MQX 4.1 . SD card read issue (For bigger file Size > 1MB)

sohamd — Thu, 30 May 2019 08:34:24 GMT

sure , let me test that