From d559f63c85b80abbc9a84047ea61a04a24460b5c Mon Sep 17 00:00:00 2001
From: Ry <ryanst755@gmail.com>
Date: Fri, 24 Mar 2023 23:34:04 -0700
Subject: [PATCH] Add RTC port for checking if DST is active

---
 src/bus.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/bus.c b/src/bus.c
index 83c1f20..272496d 100644
--- a/src/bus.c
+++ b/src/bus.c
@@ -94,7 +94,7 @@ int bus_io_read(void *user, uint32_t *value, uint32_t port) {
             break;
         }
 
-        case 0x80000700 ... 0x80000706: { // RTC port
+        case 0x80000700 ... 0x80000707: { // RTC port
             uint8_t setting = port & 0x000000FF;
             struct tm *now = localtime(&rtc_time);
             switch (setting) {
@@ -126,6 +126,10 @@ int bus_io_read(void *user, uint32_t *value, uint32_t port) {
                     *value = rtc_uptime;
                     break;
                 }
+                case 0x07: { // daylight savings time active
+                    *value = now->tm_isdst;
+                    break;
+                }
             }
 
             break;