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root / proj / libs / rtc / src / rtc.c @ 368

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#include <lcom/lcf.h>
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#include "rtc.h"
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#include "utils.h"
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#include "errors.h"
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// RTC IRQ Line
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#define KBC_IRQ   8  /* @brief KBC IRQ Line */
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// RTC Ports
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#define RTC_ADDR_REG        0x70
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#define RTC_DATA_REG        0x71
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// RTC Registers (Byte)
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#define RTC_SEC             0
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#define RTC_SEC_ALARM       1
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#define RTC_MIN             2
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#define RTC_MIN_ALARM       3
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#define RTC_HOUR            4
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#define RTC_HOUR_ALARM      5
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#define RTC_WEEK_DAY        6
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#define RTC_MONTH_DAY       7
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#define RTC_MONTH           8
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#define RTC_YEAR            9
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#define RTC_REG_A           10
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#define RTC_REG_B           11
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#define RTC_REG_C           12
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#define RTC_REG_D           13
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// Register A
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#define RS0     BIT(0)  /** @brief Rate selector */
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#define RS1     BIT(1)  /** @brief Rate selector */
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#define RS2     BIT(2)  /** @brief Rate selector */
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#define RS3     BIT(3)  /** @brief Rate selector */
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#define UIP     BIT(7)  /** @brief Update in progress */
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// Register B
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#define DSE             BIT(0)  /** @brief Enable Daylight Saving Time */
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#define HOUR_FORM       BIT(1)  /** @brief Set to 1 for 24h format (0-23), 0 to 12h format (1-12) */
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#define DM              BIT(2)  /** @brief Set to 1 if registers are in binary, 0 if in BCD */
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#define SQWE            BIT(3)  /** @brief Enable square wave generation */
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#define UIE             BIT(4)  /** @brief Enable Update interrupts */
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#define AIE             BIT(5)  /** @brief Enable alarm interrupts */
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#define PIE             BIT(6)  /** @brief Enable periodic interrupts */
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#define SET             BIT(7)  /** @brief Set to 1 to inhibit updates of time/date registers */
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// Register C
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#define UF      BIT(4)  /** @brief Update Interrupt Pending */
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#define AF      BIT(5)  /** @brief Alarm Interrupt Pending */
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#define PF      BIT(6)  /** @brief Periodic Interrupt Pending */
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#define IRQF    BIT(7)  /** @brief IRQ Line Active */
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// Register D
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#define VRT     BIT(7)  /** @brief Valid RAM/time - If set to 0 RTC reading aren't valid */
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int (subscribe_rtc_interrupt)(uint8_t interrupt_bit, int *interrupt_id) {
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    if (interrupt_id == NULL) return NULL_PTR;
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    *interrupt_id = interrupt_bit;
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    if (sys_irqsetpolicy(KBC_IRQ, IRQ_REENABLE | IRQ_EXCLUSIVE, interrupt_id)) return SBCR_ERROR;
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    return SUCCESS;
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}
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int (rtc_read_register)(uint32_t reg, uint8_t *data) {
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    if (sys_outb(RTC_ADDR_REG, reg)) return WRITE_ERROR;
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    if (util_sys_inb(RTC_DATA_REG, data)) return READ_ERROR;
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    return SUCCESS;
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}
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int (rtc_write_register)(uint32_t reg, uint8_t data) {
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    if (sys_outb(RTC_ADDR_REG, reg)) return WRITE_ERROR;
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    if (sys_outb(RTC_DATA_REG, data)) return WRITE_ERROR;
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    return SUCCESS;
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}
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int (rtc_check_update)(void) {
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    uint8_t data;
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    int r;
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    if ((r = rtc_read_register(RTC_REG_A, &data))) return r;
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    return (data & UIP) != 0;
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}
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int (rtc_set_updates)(int on) {
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    uint8_t data;
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    int r;
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    if (on) {
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        if ((r = rtc_read_register(RTC_REG_B, &data))) return r;
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        data &= ~SET;
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        if ((r = rtc_write_register(RTC_REG_B, data))) return r;
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    } else {
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        while (rtc_check_update());
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        if ((r = rtc_read_register(RTC_REG_B, &data))) return r;
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        data |= SET;
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        if ((r = rtc_write_register(RTC_REG_B, data))) return r;
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    }
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    return SUCCESS;
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}
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int (rtc_read_time)(uint8_t *time) {
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    int r;
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    //if ((r = rtc_set_updates(false))) return r;
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    while (rtc_check_update());
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    uint8_t hour, min, sec;
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    if ((r = rtc_read_register(RTC_SEC, &sec)))    return r;
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    if ((r = rtc_read_register(RTC_MIN, &min)))    return r;
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    if ((r = rtc_read_register(RTC_HOUR, &hour)))  return r;
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    //if ((r = rtc_set_updates(true))) return r;
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    time[0] = BCD_FIRST(sec)*10   + BCD_SECOND(sec);
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    time[1] = BCD_FIRST(min)*10   + BCD_SECOND(min);
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    time[2] = BCD_FIRST(hour)*10  + BCD_SECOND(hour);
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    return SUCCESS;
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}
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int (rtc_read_date)(uint8_t *date) {
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    int r;
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    //if ((r = rtc_set_updates(false))) return r;
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    while (rtc_check_update());
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    uint8_t year, month, day, weekday;
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    if ((r = rtc_read_register(RTC_WEEK_DAY,    &weekday)))     return r;
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    if ((r = rtc_read_register(RTC_MONTH_DAY,   &day)))         return r;
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    if ((r = rtc_read_register(RTC_MONTH,       &month)))       return r;
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    if ((r = rtc_read_register(RTC_YEAR,        &year)))        return r;
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    //if ((r = rtc_set_updates(true))) return r;
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    date[0] = weekday;
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    date[1] = BCD_FIRST(day)*10     + BCD_SECOND(day);
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    date[2] = BCD_FIRST(month)*10   + BCD_SECOND(month);
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    date[3] = BCD_FIRST(year)*10    + BCD_SECOND(year);
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    return SUCCESS;
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}