Timer re-worked!

[lunaix-os.git] / lunaix-os / hal / rtc.c

diff --git a/lunaix-os/hal/rtc.c b/lunaix-os/hal/rtc.c
index 319ad65663eea4e2e946ed6cb3b80e4ad023850e..0e3673c2184800e39866bf335aaf674c2c8adcc8 100644 (file)
--- a/lunaix-os/hal/rtc.c
+++ b/lunaix-os/hal/rtc.c
@@ -1,4 +1,26 @@
+/**
+ * @file rtc.c
+ * @author Lunaixsky
+ * @brief RTC & CMOS abstraction. Reference: MC146818A & Intel Series 500 PCH datasheet
+ * @version 0.1
+ * @date 2022-03-07
+ * 
+ * @copyright Copyright (c) 2022
+ * 
+ */
 #include <hal/rtc.h>
+#include <lunaix/time.h>
+#include <klibc/string.h>
+
+void
+rtc_init() {
+    uint8_t regA = rtc_read_reg(RTC_REG_A | WITH_NMI_DISABLED);
+    regA = (regA & ~0x7f) | RTC_FREQUENCY_1024HZ | RTC_DIVIDER_33KHZ;
+    rtc_write_reg(RTC_REG_A | WITH_NMI_DISABLED, regA);
+
+    // Make sure the rtc timer is disabled by default
+    rtc_disable_timer();
+}
 
 uint8_t
 rtc_read_reg(uint8_t reg_selector)
@@ -7,22 +29,47 @@ rtc_read_reg(uint8_t reg_selector)
     return io_inb(RTC_TARGET_PORT);
 }
 
+void
+rtc_write_reg(uint8_t reg_selector, uint8_t val)
+{
+    io_outb(RTC_INDEX_PORT, reg_selector);
+    io_outb(RTC_TARGET_PORT, val);
+}
+
 uint8_t
 bcd2dec(uint8_t bcd)
 {
-    return (bcd >> 4) * 10 + (bcd & 0x0f);
+    return ((bcd & 0xF0) >> 1) + ((bcd & 0xF0) >> 3) + (bcd & 0xf);
+}
+
+int
+rtc_date_same(datetime_t* a, datetime_t* b) {
+    return a->year == b->year &&
+           a->month == b->month &&
+           a->day == b->day &&
+           a->weekday == b->weekday &&
+           a->minute == b->minute &&
+           a->second == b->second;
 }
 
 void
-rtc_get_datetime(rtc_datetime* datetime)
+time_getdatetime(datetime_t* datetime)
 {
-    datetime->year = rtc_read_reg(RTC_REG_YRS);
-    datetime->month = rtc_read_reg(RTC_REG_MTH);
-    datetime->day = rtc_read_reg(RTC_REG_DAY);
-    datetime->weekday = rtc_read_reg(RTC_REG_WDY);
-    datetime->hour = rtc_read_reg(RTC_REG_HRS);
-    datetime->minute = rtc_read_reg(RTC_REG_MIN);
-    datetime->second = rtc_read_reg(RTC_REG_SEC);
+    datetime_t current;
+    
+    do
+    {
+        while (rtc_read_reg(RTC_REG_A) & 0x80);
+        memcpy(&current, datetime, sizeof(datetime_t));
+
+        datetime->year = rtc_read_reg(RTC_REG_YRS);
+        datetime->month = rtc_read_reg(RTC_REG_MTH);
+        datetime->day = rtc_read_reg(RTC_REG_DAY);
+        datetime->weekday = rtc_read_reg(RTC_REG_WDY);
+        datetime->hour = rtc_read_reg(RTC_REG_HRS);
+        datetime->minute = rtc_read_reg(RTC_REG_MIN);
+        datetime->second = rtc_read_reg(RTC_REG_SEC);
+    } while (!rtc_date_same(datetime, &current));
 
     uint8_t regbv = rtc_read_reg(RTC_REG_B);
 
@@ -38,10 +85,21 @@ rtc_get_datetime(rtc_datetime* datetime)
 
 
     // To 24 hour format
-    if (!RTC_24HRS_ENCODED(regbv)) {
-        datetime->hour = (datetime->hour >> 7) ? (12 + datetime->hour & 0x80)
-                                               : (datetime->hour & 0x80);
+    if (!RTC_24HRS_ENCODED(regbv) && (datetime->hour >> 7)) {
+        datetime->hour = (12 + datetime->hour & 0x80);
     }
 
     datetime->year += RTC_CURRENT_CENTRY * 100;
+}
+
+void
+rtc_enable_timer() {
+    uint8_t regB = rtc_read_reg(RTC_REG_B | WITH_NMI_DISABLED);
+    rtc_write_reg(RTC_REG_B | WITH_NMI_DISABLED, regB | RTC_TIMER_ON);
+}
+
+void
+rtc_disable_timer() {
+    uint8_t regB = rtc_read_reg(RTC_REG_B | WITH_NMI_DISABLED);
+    rtc_write_reg(RTC_REG_B | WITH_NMI_DISABLED, regB & ~RTC_TIMER_ON);
 }
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