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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** FileX Component */
/** */
/** System */
/** */
/**************************************************************************/
/**************************************************************************/
#define FX_SOURCE_CODE
/* Include necessary system files. */
#include "fx_api.h"
#include "fx_system.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _fx_system_timer_entry PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is FileX system timer function. It is called at the */
/* rate specified by FX_UPDATE_RATE_IN_SECONDS and is responsible for */
/* maintaining both the system date and time. */
/* */
/* INPUT */
/* */
/* id Not used */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* Application Initialization */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 William E. Lamie Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
VOID _fx_system_timer_entry(ULONG id)
{
UINT second;
UINT minute;
UINT hour;
UINT day;
UINT month;
UINT year;
/* Determine if the ID is valid. */
if (id == FX_TIMER_ID)
{
/* Break the current date time into separate fields for easier work! */
second = (_fx_system_time & FX_SECOND_MASK) * 2;
minute = (_fx_system_time >> FX_MINUTE_SHIFT) & FX_MINUTE_MASK;
hour = (_fx_system_time >> FX_HOUR_SHIFT) & FX_HOUR_MASK;
day = _fx_system_date & FX_DAY_MASK;
month = (_fx_system_date >> FX_MONTH_SHIFT) & FX_MONTH_MASK;
year = ((_fx_system_date >> FX_YEAR_SHIFT) & FX_YEAR_MASK) + FX_BASE_YEAR;
/* Now apply the "second" update. */
second = second + FX_UPDATE_RATE_IN_SECONDS;
/* Determine if we need to adjust the minute field. */
if (second > FX_MAXIMUM_SECOND)
{
/* Yes, we need to adjust the minute field. */
minute = minute + second / 60;
second = second % 60;
/* Determine if we need to adjust the hour field. */
if (minute > FX_MAXIMUM_MINUTE)
{
/* Yes, we need to adjust the hour field. */
hour = hour + minute / 60;
minute = minute % 60;
/* Determine if we need to adjust the day field. */
if (hour > FX_MAXIMUM_HOUR)
{
/* Yes, we need to adjust the day field. */
hour = 0;
day++;
/* Determine if we need to adjust the month field. */
switch (month)
{
case 1: /* January */
{
/* Check for end of the month. */
if (day > 31)
{
/* Move to next month. */
day = 1;
month++;
}
break;
}
case 2: /* February */
{
/* Check for leap year. We don't need to check for leap
century her (century years divisible by 400) since 2000
is and this FAT format only supports years to 2107. */
if ((year % 4) == 0)
{
/* Leap year in February... check for 29 days
instead of 28. */
if (day > 29)
{
/* Adjust the month. */
day = 1;
month++;
}
}
else
{
if (day > 28)
{
/* Adjust the month. */
day = 1;
month++;
}
}
break;
}
case 3: /* March */
{
/* Check for end of the month. */
if (day > 31)
{
/* Move to next month. */
day = 1;
month++;
}
break;
}
case 4: /* April */
{
/* Check for end of the month. */
if (day > 30)
{
/* Move to next month. */
day = 1;
month++;
}
break;
}
case 5: /* May */
{
/* Check for end of the month. */
if (day > 31)
{
/* Move to next month. */
day = 1;
month++;
}
break;
}
case 6: /* June */
{
/* Check for end of the month. */
if (day > 30)
{
/* Move to next month. */
day = 1;
month++;
}
break;
}
case 7: /* July */
{
/* Check for end of the month. */
if (day > 31)
{
/* Move to next month. */
day = 1;
month++;
}
break;
}
case 8: /* August */
{
/* Check for end of the month. */
if (day > 31)
{
/* Move to next month. */
day = 1;
month++;
}
break;
}
case 9: /* September */
{
/* Check for end of the month. */
if (day > 30)
{
/* Move to next month. */
day = 1;
month++;
}
break;
}
case 10: /* October */
{
/* Check for end of the month. */
if (day > 31)
{
/* Move to next month. */
day = 1;
month++;
}
break;
}
case 11: /* November */
{
/* Check for end of the month. */
if (day > 30)
{
/* Move to next month. */
day = 1;
month++;
}
break;
}
case 12: /* December */
{
/* Check for end of the month. */
if (day > 31)
{
/* Move to next month. */
day = 1;
month = 1;
/* Also move to next year. */
year++;
/* Check for a year that exceeds the representation
in this format. */
if (year > FX_MAXIMUM_YEAR)
{
return;
}
}
break;
}
default: /* Invalid month! */
return; /* Skip updating date/time! */
}
}
}
}
/* Now apply the new setting to the internal representation. */
/* Set the system date. */
_fx_system_date = ((year - FX_BASE_YEAR) << FX_YEAR_SHIFT) |
(month << FX_MONTH_SHIFT) | day;
/* Set the new system time. */
_fx_system_time = (hour << FX_HOUR_SHIFT) |
(minute << FX_MINUTE_SHIFT) | (second / 2);
}
}