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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** FileX Component */ |
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/** */ |
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/** System */ |
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/** */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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#define FX_SOURCE_CODE |
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/* Include necessary system files. */ |
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#include "fx_api.h" |
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#include "fx_system.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _fx_system_timer_entry PORTABLE C */ |
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/* 6.1 */ |
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/* AUTHOR */ |
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/* */ |
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/* William E. Lamie, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function is FileX system timer function. It is called at the */ |
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/* rate specified by FX_UPDATE_RATE_IN_SECONDS and is responsible for */ |
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/* maintaining both the system date and time. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* id Not used */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* None */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* None */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Application Initialization */ |
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/* */ |
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/* RELEASE HISTORY */ |
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/* */ |
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/* DATE NAME DESCRIPTION */ |
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/* */ |
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/* 05-19-2020 William E. Lamie Initial Version 6.0 */ |
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/* 09-30-2020 William E. Lamie Modified comment(s), */ |
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/* resulting in version 6.1 */ |
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/* */ |
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/**************************************************************************/ |
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315446404 |
VOID _fx_system_timer_entry(ULONG id) |
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{ |
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UINT second; |
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UINT minute; |
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UINT hour; |
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UINT day; |
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UINT month; |
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UINT year; |
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/* Determine if the ID is valid. */ |
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✓✓ |
315446404 |
if (id == FX_TIMER_ID) |
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{ |
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/* Break the current date time into separate fields for easier work! */ |
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315446403 |
second = (_fx_system_time & FX_SECOND_MASK) * 2; |
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315446403 |
minute = (_fx_system_time >> FX_MINUTE_SHIFT) & FX_MINUTE_MASK; |
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315446403 |
hour = (_fx_system_time >> FX_HOUR_SHIFT) & FX_HOUR_MASK; |
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315446403 |
day = _fx_system_date & FX_DAY_MASK; |
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315446403 |
month = (_fx_system_date >> FX_MONTH_SHIFT) & FX_MONTH_MASK; |
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year = ((_fx_system_date >> FX_YEAR_SHIFT) & FX_YEAR_MASK) + FX_BASE_YEAR; |
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/* Now apply the "second" update. */ |
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second = second + FX_UPDATE_RATE_IN_SECONDS; |
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/* Determine if we need to adjust the minute field. */ |
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✓✓ |
315446403 |
if (second > FX_MAXIMUM_SECOND) |
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{ |
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/* Yes, we need to adjust the minute field. */ |
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73936801 |
minute = minute + second / 60; |
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73936801 |
second = second % 60; |
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/* Determine if we need to adjust the hour field. */ |
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✓✓ |
73936801 |
if (minute > FX_MAXIMUM_MINUTE) |
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{ |
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/* Yes, we need to adjust the hour field. */ |
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26439913 |
hour = hour + minute / 60; |
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26439913 |
minute = minute % 60; |
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/* Determine if we need to adjust the day field. */ |
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✓✓ |
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if (hour > FX_MAXIMUM_HOUR) |
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{ |
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/* Yes, we need to adjust the day field. */ |
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25668424 |
hour = 0; |
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25668424 |
day++; |
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/* Determine if we need to adjust the month field. */ |
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✓✓✓✓
✓✓✓✓
✓✓✓✓
✓ |
25668424 |
switch (month) |
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{ |
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case 1: /* January */ |
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{ |
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/* Check for end of the month. */ |
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✓✓ |
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if (day > 31) |
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{ |
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/* Move to next month. */ |
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day = 1; |
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month++; |
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} |
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break; |
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} |
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case 2: /* February */ |
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{ |
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/* Check for leap year. We don't need to check for leap |
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century her (century years divisible by 400) since 2000 |
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is and this FAT format only supports years to 2107. */ |
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✓✓ |
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if ((year % 4) == 0) |
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{ |
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/* Leap year in February... check for 29 days |
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instead of 28. */ |
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✓✓ |
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if (day > 29) |
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{ |
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/* Adjust the month. */ |
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day = 1; |
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month++; |
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} |
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} |
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else |
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{ |
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✓✓ |
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if (day > 28) |
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{ |
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/* Adjust the month. */ |
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day = 1; |
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month++; |
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} |
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} |
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break; |
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} |
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case 3: /* March */ |
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{ |
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/* Check for end of the month. */ |
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✓✓ |
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if (day > 31) |
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{ |
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/* Move to next month. */ |
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day = 1; |
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month++; |
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} |
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break; |
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} |
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case 4: /* April */ |
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{ |
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/* Check for end of the month. */ |
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✓✓ |
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if (day > 30) |
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{ |
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/* Move to next month. */ |
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day = 1; |
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month++; |
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} |
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break; |
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} |
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case 5: /* May */ |
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{ |
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/* Check for end of the month. */ |
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✓✓ |
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if (day > 31) |
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{ |
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/* Move to next month. */ |
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day = 1; |
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month++; |
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} |
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break; |
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} |
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case 6: /* June */ |
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{ |
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/* Check for end of the month. */ |
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✓✓ |
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if (day > 30) |
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{ |
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/* Move to next month. */ |
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day = 1; |
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month++; |
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} |
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break; |
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} |
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case 7: /* July */ |
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{ |
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/* Check for end of the month. */ |
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✓✓ |
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if (day > 31) |
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{ |
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/* Move to next month. */ |
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day = 1; |
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month++; |
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} |
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break; |
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} |
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case 8: /* August */ |
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{ |
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/* Check for end of the month. */ |
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✓✓ |
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if (day > 31) |
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{ |
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/* Move to next month. */ |
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day = 1; |
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month++; |
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} |
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break; |
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} |
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case 9: /* September */ |
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{ |
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/* Check for end of the month. */ |
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✓✓ |
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if (day > 30) |
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{ |
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/* Move to next month. */ |
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day = 1; |
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month++; |
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} |
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break; |
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} |
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case 10: /* October */ |
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{ |
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/* Check for end of the month. */ |
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✓✓ |
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if (day > 31) |
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{ |
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/* Move to next month. */ |
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day = 1; |
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month++; |
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} |
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break; |
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} |
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case 11: /* November */ |
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{ |
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/* Check for end of the month. */ |
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✓✓ |
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if (day > 30) |
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{ |
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/* Move to next month. */ |
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day = 1; |
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month++; |
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} |
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break; |
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} |
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25551332 |
case 12: /* December */ |
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{ |
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/* Check for end of the month. */ |
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✓✓ |
25551332 |
if (day > 31) |
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{ |
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/* Move to next month. */ |
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25548572 |
day = 1; |
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25548572 |
month = 1; |
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/* Also move to next year. */ |
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25548572 |
year++; |
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/* Check for a year that exceeds the representation |
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in this format. */ |
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✓✓ |
25548572 |
if (year > FX_MAXIMUM_YEAR) |
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{ |
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25548481 |
return; |
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} |
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} |
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break; |
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} |
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86400 |
default: /* Invalid month! */ |
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86400 |
return; /* Skip updating date/time! */ |
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} |
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} |
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} |
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} |
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/* Now apply the new setting to the internal representation. */ |
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/* Set the system date. */ |
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289811522 |
_fx_system_date = ((year - FX_BASE_YEAR) << FX_YEAR_SHIFT) | |
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289811522 |
(month << FX_MONTH_SHIFT) | day; |
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/* Set the new system time. */ |
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289811522 |
_fx_system_time = (hour << FX_HOUR_SHIFT) | |
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289811522 |
(minute << FX_MINUTE_SHIFT) | (second / 2); |
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} |
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} |
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