From 2d072d0d8f72c710ef10f620a9b2c9be604826a7 Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Tue, 15 Mar 2022 18:54:42 +0100
Subject: Add datetime device (always starts at 0)

---
 Makefile   |  2 +-
 src/main.c | 21 ++++++++++++++++++++-
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 3f68019..100c861 100644
--- a/Makefile
+++ b/Makefile
@@ -45,7 +45,7 @@ CFLAGS         += $(INC_FLAGS)
 CFLAGS         += $(CONFIG)
 LDFLAGS        := $(ARCH) $(SPECS)
 LDLIBS         := $(LIBGBA)
-RELEASE_CFLAGS := -DNDEBUG -O3
+RELEASE_CFLAGS := -DNDEBUG -O2
 DEBUG_CFLAGS   := -DDEBUG -O2 -g
 
 .PHONY: clean run
diff --git a/src/main.c b/src/main.c
index e73a740..296373f 100644
--- a/src/main.c
+++ b/src/main.c
@@ -10,6 +10,7 @@ WITH REGARD TO THIS SOFTWARE.
 */
 
 #include <string.h>
+#include <time.h>
 
 #include "common.h"
 #include "bitmap.h"
@@ -69,6 +70,8 @@ WITH REGARD TO THIS SOFTWARE.
 #define PROF_INIT()
 #endif
 
+static time_t seconds = 0;
+
 typedef enum {
     CONTROL_CONTROLLER,
     CONTROL_MOUSE,
@@ -200,9 +203,19 @@ audio_talk(Device *d, u8 b0, u8 w) {
 
 void
 datetime_talk(Device *d, u8 b0, u8 w) {
-    (void)d;
     (void)b0;
     (void)w;
+    struct tm *t = gmtime(&seconds);
+    t->tm_year += 1900;
+    DEVPOKE16(0x0, t->tm_year);
+    d->dat[0x2] = t->tm_mon;
+    d->dat[0x3] = t->tm_mday;
+    d->dat[0x4] = t->tm_hour;
+    d->dat[0x5] = t->tm_min;
+    d->dat[0x6] = t->tm_sec;
+    d->dat[0x7] = t->tm_wday;
+    DEVPOKE16(0x08, t->tm_yday);
+    d->dat[0xa] = t->tm_isdst;
 }
 
 void
@@ -461,6 +474,7 @@ int main(void) {
     // Main loop.
     uxn_eval(&u, PAGE_PROGRAM);
     PROF_INIT();
+    u8 frame_counter = 0;
     while(true) {
         bios_vblank_wait();
         PROF(handle_input(&u), input_cycles);
@@ -468,6 +482,11 @@ int main(void) {
         PROF(sound_mix(), mix_cycles);
         PROF_SHOW();
         PROF(flipbuf(&ppu), flip_cycles);
+        frame_counter++;
+        if (frame_counter == 60) {
+            seconds++;
+            frame_counter = 0;
+        }
     }
 
     return 0;
-- 
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