topic Re: Can't get this to work in Kinetis Microcontrollers

Can't get this to work

neilporven — Tue, 05 Jul 2016 17:39:46 GMT

The following is an example from the FatFs website:

FRESULT set_timestamp (

char *obj, /* Pointer to the file name */

int year,

int month,

int mday,

int hour,

int min,

int sec

)

{

FILINFO fno;

fno.fdate = (WORD)(((year - 1980) * 512U) | month * 32U | mday);

fno.ftime = (WORD)(hour * 2048U | min * 32U | sec / 2U);

return f_utime(obj, &fno);

If I try to use WORD, the compiler throws the following error:

called object 'WORD' is not a function or function pointer

How can I do the typecast WORD?

Thanks you,

Neil

Re: Can't get this to work

JHinkle — Tue, 05 Jul 2016 18:55:34 GMT

WORD in the code above ..

#define WORD unsigned long

Hope that helps.

Joe

Re: Can't get this to work

JHinkle — Tue, 05 Jul 2016 19:07:11 GMT

I noticed in FatFS that WORD is some places was actually referring to the WORD size of the micro -- Thats why I gave you a 32 bit value.

Looking at the maximum values for date and time from the equations you could also place the values into unsigned short int (16 bit).

I don't use a realtime clock -- so I fake a date/time based on the number of time tics since the micro started.

Here's my code.

dword xTaskGetTickCount(void);

DWORD get_fattime (void)

{

dword TM = xTaskGetTickCount(); // this is tics

word days, hours, min, sec;

TM *= portTICK_PERIOD_MS; // now have msec

TM /= 1000; // now seconds

days = TM / (60 *60 *24);

TM -= days * (60 * 60 * 24);

hours = TM / (60 * 60);

TM -= hours * (60 * 60);

min = TM / 60;

TM -= min * 60;

sec = TM;

if(sec > 60)

sec = 0;

return ((DWORD)(2016 - 1980) << 25) // Year 2014

| ((DWORD)7 << 21) // Month 7

| ((DWORD)(10+days) << 16) // Mday 10

| ((DWORD)hours << 11) // Hour 16

| ((DWORD)min << 5) // Min 0

| ((DWORD)sec >> 1); // Sec 0

}

The DWORD is from FatFS and is defined as

#define DWORD unsigned long.

Joe

Re: Can't get this to work

kerryzhou — Wed, 06 Jul 2016 06:11:18 GMT

Hi Neil Porven,

If you download the Fatfs source code from its official website:

FatFs - Generic FAT File System Module

You will find a header file named as: integer.h

The content in the integer.h is:

#ifndef _FF_INTEGER

#define _FF_INTEGER

#ifdef _WIN32 /* FatFs development platform */

#include <windows.h>

#include <tchar.h>

typedef unsigned __int64 QWORD;

#else /* Embedded platform */

/* These types MUST be 16-bit or 32-bit */

typedef int INT;

typedef unsigned int UINT;

/* This type MUST be 8-bit */

typedef unsigned char BYTE;

/* These types MUST be 16-bit */

typedef short SHORT;

typedef unsigned short WORD;

typedef unsigned short WCHAR;

/* These types MUST be 32-bit */

typedef long LONG;

typedef unsigned long DWORD;

/* This type MUST be 64-bit (Remove this for C89 compatibility) */

typedef unsigned long long QWORD;

#endif

So, you can include the integer.h in your set_timestamp function file.

Wish it helps you!

If you still have question, please contact me!

Have a great day,
Jingjing

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