mirror of
https://github.com/0Nera/BMOSP.git
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82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
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/**
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* rtc.c
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* Часы реального времени
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*
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* Функции даты и времени с точностью до секунды
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*
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*/
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#include <lock.h>
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#include <log.h>
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#include <stdint.h>
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#include <sys.h>
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#include <tool.h>
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#define CMOS_ADDR_PORT 0x70
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#define CMOS_DATA_PORT 0x71
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static int century_register = 0;
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static uint8_t century = 20;
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static inline uint8_t read_cmos(uint8_t addr) {
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outb(CMOS_ADDR_PORT, addr);
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return inb(CMOS_DATA_PORT);
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}
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static inline int get_update_in_progress_flag( ) {
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outb(CMOS_ADDR_PORT, 0x0A);
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return (inb(CMOS_DATA_PORT) & 0x80);
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}
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time_t rtc_get_time( ) {
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uint8_t last_second, last_minute, last_hour, last_day, last_month, last_year;
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time_t rtc_time;
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while (get_update_in_progress_flag( ))
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;
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rtc_time.second = read_cmos(0x00);
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rtc_time.minutes = read_cmos(0x02);
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rtc_time.hours = read_cmos(0x04);
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rtc_time.day = read_cmos(0x07);
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rtc_time.month = read_cmos(0x08);
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rtc_time.year = read_cmos(0x09);
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if (century_register != 0) { rtc_time.year += century * 100; }
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do {
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last_second = rtc_time.second;
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last_minute = rtc_time.minutes;
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last_hour = rtc_time.hours;
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last_day = rtc_time.day;
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last_month = rtc_time.month;
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last_year = rtc_time.year;
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while (get_update_in_progress_flag( ))
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;
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rtc_time.second = read_cmos(0x00);
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rtc_time.minutes = read_cmos(0x02);
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rtc_time.hours = read_cmos(0x04);
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rtc_time.day = read_cmos(0x07);
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rtc_time.month = read_cmos(0x08);
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rtc_time.year = read_cmos(0x09);
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if (century_register != 0) { rtc_time.year += century * 100; }
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} while ((last_second != rtc_time.second) || (last_minute != rtc_time.minutes) || (last_hour != rtc_time.hours) ||
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(last_day != rtc_time.day) || (last_month != rtc_time.month) || (last_year != rtc_time.year));
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uint8_t reg_b = read_cmos(0x0B);
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// Преобразуем BCD значения в бинарные, если необходимо
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if (!(reg_b & 0x04)) {
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rtc_time.second = (rtc_time.second & 0x0F) + ((rtc_time.second / 16) * 10);
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rtc_time.minutes = (rtc_time.minutes & 0x0F) + ((rtc_time.minutes / 16) * 10);
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rtc_time.hours = ((rtc_time.hours & 0x0F) + (((rtc_time.hours & 0x70) / 16) * 10)) | (rtc_time.hours & 0x80);
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rtc_time.day = (rtc_time.day & 0x0F) + ((rtc_time.day / 16) * 10);
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rtc_time.month = (rtc_time.month & 0x0F) + ((rtc_time.month / 16) * 10);
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rtc_time.year = (rtc_time.year & 0x0F) + ((rtc_time.year / 16) * 10);
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}
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return rtc_time;
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}
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