Hello again,
2008/12/10 Kees Grinwis <[EMAIL PROTECTED]>:
> I suggest to have a look at the attached source of a simple test
> application related to the implementation of the retrieval of the
> current time from the operating system before continuing reading this
> posting.
Whoops, I'd forgotten to include the file itself. Corrected with this mail...
--
Greetingz
Kees
#include <time.h>
#include <stdio.h>
unsigned char cmosram[256];
#if defined linux || defined __linux
#define RPCEMU_UNIX
#define RPCEMU_LINUX
#endif
#if defined WIN32 || defined _WIN32
#define RPCEMU_WIN32
#endif
struct rpcemu_cmostime {
int tick; // centiseconds
int second;
int minute;
int hour;
int monthday;
int month;
int year;
};
/**
* Function updates the given <code>struct rpcemu_cmostime</code> with the
* current system time.
*
* The actual implementation is platform specific.
*
* @param *cmostime The structure that should be populated
*
*/
void cmosgetsystemtime(struct rpcemu_cmostime *cmostime) {
#if defined RPCEMU_UNIX
time_t systemtime;
struct tm *tm_systemtime;
/* First get the current system time and convert it to a tm struct */
systemtime = time(NULL);
tm_systemtime = gmtime(&systemtime);
/* Populate the rpcemu_cmostime structure */
cmostime->year = tm_systemtime->tm_year; /* N.B. Year is not used in the CMOS clock... */
cmostime->month = tm_systemtime->tm_mon;
cmostime->monthday = tm_systemtime->tm_mday;
cmostime->hour = tm_systemtime->tm_hour;
cmostime->minute = tm_systemtime->tm_min;
cmostime->second = tm_systemtime->tm_sec;
cmostime->tick = 0; /* Initialise the tick counter */
#endif
#if defined RPCEMU_WIN32
SYSTEMTIME systemtime;
/* Get the system time from the Win32 API */
GetLocalTime(&systemtime);
/* Populate the rpcemu_cmostime structure */
cmostime->year = systemtime.wYear; /* N.B. Year is not used in the CMOS clock... */
cmostime->month = systemtime.wMonth;
cmostime->monthday = systemtime.wDay;
cmostime->hour = systemtime.wHour;
cmostime->minute = systemtime.wMinute;
cmostime->second = systemtime.wSecond;
cmostime->tick = systemtime.wMillisendos / 10; /* Tick counter is in centiseconds */
#endif
#if !defined RPCEMU_UNIX && !defined RPCEMU_WIN32
printf("No CMOS support\n");
// [KG][TODO] Should this be an assert?
#endif
}
/**
* Updates the global cmos RAM array with the contents of the given
* <code>struct rpcemu_cmostime</code>
*
* @param *cmostime The structure to be used
*
*/
void cmosupdatetimer(struct rpcemu_cmostime cmostime) {
int c,d;
d = cmostime.tick % 10;
c = cmostime.tick / 10;
cmosram[1] = d | (c << 4);
d = cmostime.second % 10;
c = cmostime.second / 10;
cmosram[2] = d | (c << 4);
d = cmostime.minute % 10;
c = cmostime.minute / 10;
cmosram[3] = d | (c << 4);
d = cmostime.hour % 10;
c = cmostime.hour / 10;
cmosram[4] = d | (c << 4);
d = cmostime.monthday % 10;
c = cmostime.monthday / 10;
cmosram[5] = d | (c << 4);
d = cmostime.month % 10;
c = cmostime.month / 10;
cmosram[6] = d | (c << 4);
/* The time is stored in BCD format in the CMOS clock, so when assuming
* hexadecimals the time should be printed correctly for us humans
*/
printf("M%2x - D%2x\n", cmosram[6], cmosram[5]);
printf("%2x:%2x:%2x\n", cmosram[4], cmosram[3], cmosram[2]);
}
int main(void) {
struct rpcemu_cmostime cmostime;
cmosgetsystemtime(&cmostime);
cmosupdatetimer(cmostime);
return 0;
}
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