add a manual dst toggle

Uses a simplistic set of jump tables to toggle daylight savings on and off.

movement/movement.c

@@ -122,6 +122,107 @@ const int16_t movement_timezone_offsets[] = {
     -60,    // 40 :  -1:00:00 (Azores Standard Time)
 };
 
+/* These are approximate equivalent DST timezones for each
+ * timezone in the offset table. Unlike the full tzinfo file,
+ * the time-offsets used above are incomplete, so there are
+ * cases below where an approximate DST timezone is proposed
+ * for a timezone where no one observes DST, and cases
+ * where we can't propose an equivaent DST timezone since
+ * there isn't an appropriate one in the offset table.
+ *
+ * However, this should be good enough for anyone living in
+ * a DST-observing region to manually toggle DST without
+ * having to separately change the hour and timezone info
+ * in the time set face.
+ */
+const uint8_t movement_dst_jump_table[] = {
+    1,  // 0  UTC  + 1 = CET
+    2,  // 1  CET  + 1 = SAST
+    3,  // 2  SAST + 1 = AST
+    5,  // 3  AST  + 1 = GST
+    6,  // 4  IST  + 1 = AT
+    7,  // 5  GST  + 1 = PST
+    8,  // 6  AT   + 1 = IST
+    10, // 7  PST  + 1 = KT
+    11, // 8  IST  + 1 = MT
+    9,  // 9  Nepal has no equivalent DST timezone, but they don't observe DST anyway
+    12, // 10 KT   + 1 = TST
+    11, // 11 Myanmar has no equivalent DST timezone, but they don't observe DST anyway
+    13, // 12 TST  + 1 = CST
+    15, // 13 CST  + 1 = JST
+    14, // 14 ACWST has no equivalent DST timezone, but they don't observe DST anyway
+    17, // 15 JST  + 1 = AEST
+    18, // 16 ACST + 1 = LHST
+    19, // 17 AEST + 1 = SIT
+    18, // 18 LHST has no equivalent DST timezone, but they don't observe DST anyway
+    20, // 19 SIT  + 1 = NZST
+    22, // 20 NZST + 1 = TT
+    23, // 21 CST  + 1 = CDT
+    24, // 22 TT   + 1 = LIT
+    23, // 23 CDT is already a daylight timezone
+    24, // 24 LIT has no equivalent DST timezone, but they don't observe DST anyway
+    26, // 25 BIT  + 1 = NT
+    27, // 26 NT   + 1 = HAST
+    29, // 27 HAST + 1 = AST
+    28, // 28 MIT has no equivalent DST timezone, but they don't observe DST anyway
+    30, // 29 AST  + 1 = PST
+    31, // 30 PST  + 1 = MST
+    32, // 31 MST  + 1 = CST
+    33, // 32 CST  + 1 = EST
+    35, // 33 EST  + 1 = AST
+    36, // 34 VST  + 1 = NST
+    37, // 35 AST  + 1 = BT
+    38, // 36 NST  + 1 = NDT
+    39, // 37 BT   + 1 = 39
+    38, // 38 NDT is already a daylight timezone
+    40, // 39 FNT  + 1 = AST
+    0   // 40 AST  + 1 = UTC
+};
+
+const uint8_t movement_dst_inverse_jump_table[] = {
+    40, // 0
+    0,  // 1
+    1,  // 2
+    2,  // 3
+    4,  // 4
+    3,  // 5
+    4,  // 6
+    5,  // 7
+    6,  // 8
+    9,  // 9
+    7,  // 10
+    8,  // 11
+    10, // 12
+    12, // 13
+    14, // 14
+    13, // 15
+    16, // 16
+    15, // 17
+    16, // 18
+    17, // 19
+    19, // 20
+    21, // 21
+    20, // 22
+    21, // 23
+    24, // 24
+    25, // 25
+    25, // 26
+    26, // 27
+    28, // 28
+    27, // 29
+    29, // 30
+    30, // 31
+    31, // 32
+    32, // 33
+    34, // 34
+    33, // 35
+    34, // 36
+    35, // 37
+    36, // 38
+    37, // 39
+    39  // 40
+};
+
 const char movement_valid_position_0_chars[] = " AaBbCcDdEeFGgHhIiJKLMNnOoPQrSTtUuWXYZ-='+\\/0123456789";
 const char movement_valid_position_1_chars[] = " ABCDEFHlJLNORTtUX-='01378";
 
@@ -613,13 +714,13 @@ void cb_fast_tick(void) {
     // Notice: is it possible that two or more buttons have an identical timestamp? In this case
     // only one of these buttons would receive the long press event. Don't bother for now...
     if (movement_state.light_down_timestamp > 0)
-        if (movement_state.fast_ticks - movement_state.light_down_timestamp == MOVEMENT_LONG_PRESS_TICKS + 1) 
+        if (movement_state.fast_ticks - movement_state.light_down_timestamp == MOVEMENT_LONG_PRESS_TICKS + 1)
             event.event_type = EVENT_LIGHT_LONG_PRESS;
     if (movement_state.mode_down_timestamp > 0)
-        if (movement_state.fast_ticks - movement_state.mode_down_timestamp == MOVEMENT_LONG_PRESS_TICKS + 1) 
+        if (movement_state.fast_ticks - movement_state.mode_down_timestamp == MOVEMENT_LONG_PRESS_TICKS + 1)
             event.event_type = EVENT_MODE_LONG_PRESS;
     if (movement_state.alarm_down_timestamp > 0)
-        if (movement_state.fast_ticks - movement_state.alarm_down_timestamp == MOVEMENT_LONG_PRESS_TICKS + 1) 
+        if (movement_state.fast_ticks - movement_state.alarm_down_timestamp == MOVEMENT_LONG_PRESS_TICKS + 1)
             event.event_type = EVENT_ALARM_LONG_PRESS;
     // this is just a fail-safe; fast tick should be disabled as soon as the button is up, the LED times out, and/or the alarm finishes.
     // but if for whatever reason it isn't, this forces the fast tick off after 20 seconds.

movement/movement.h

@@ -62,7 +62,8 @@ typedef union {
         bool clock_mode_24h : 1;            // indicates whether clock should use 12 or 24 hour mode.
         bool use_imperial_units : 1;        // indicates whether to use metric units (the default) or imperial.
         bool alarm_enabled : 1;             // indicates whether there is at least one alarm enabled.
-        uint8_t reserved : 6;               // room for more preferences if needed.
+        bool dst_active : 1;                // indicates whether daylight savings time is active
+        uint8_t reserved : 5;               // room for more preferences if needed.
     } bit;
     uint32_t reg;
 } movement_settings_t;
@@ -128,6 +129,8 @@ typedef struct {
 } movement_event_t;
 
 extern const int16_t movement_timezone_offsets[];
+extern const uint8_t movement_dst_jump_table[];
+extern const uint8_t movement_dst_inverse_jump_table[];
 extern const char movement_valid_position_0_chars[];
 extern const char movement_valid_position_1_chars[];
 

movement/watch_faces/settings/set_time_face.c

@@ -26,8 +26,8 @@
 #include "set_time_face.h"
 #include "watch.h"
 
-#define SET_TIME_FACE_NUM_SETTINGS (7)
+#define SET_TIME_FACE_NUM_SETTINGS (8)
-const char set_time_face_titles[SET_TIME_FACE_NUM_SETTINGS][3] = {"HR", "M1", "SE", "YR", "MO", "DA", "ZO"};
+const char set_time_face_titles[SET_TIME_FACE_NUM_SETTINGS][3] = {"HR", "M1", "SE", "YR", "MO", "DA", "ZO", "DS"};
 
 static bool _quick_ticks_running;
 
@@ -66,6 +66,16 @@ static void _handle_alarm_button(movement_settings_t *settings, watch_date_time
             settings->bit.time_zone++;
             if (settings->bit.time_zone > 40) settings->bit.time_zone = 0;
             break;
+        case 7: // daylight savings time
+            if (settings->bit.dst_active) {  // deactivate DST
+                date_time.unit.hour = (date_time.unit.hour + 24 - 1) % 24;
+                settings->bit.time_zone = movement_dst_inverse_jump_table[settings->bit.time_zone];
+            } else {  // activate DST
+                date_time.unit.hour = (date_time.unit.hour + 1) % 24;
+                settings->bit.time_zone = movement_dst_jump_table[settings->bit.time_zone];
+            }
+            settings->bit.dst_active = !settings->bit.dst_active;
+            break;
     }
     watch_rtc_set_date_time(date_time);
 }
@@ -146,7 +156,7 @@ bool set_time_face_loop(movement_event_t event, movement_settings_t *settings, v
         watch_clear_indicator(WATCH_INDICATOR_24H);
         watch_clear_indicator(WATCH_INDICATOR_PM);
         sprintf(buf, "%s  %2d%02d%02d", set_time_face_titles[current_page], date_time.unit.year + 20, date_time.unit.month, date_time.unit.day);
-    } else {
+    } else if (current_page < 7) {  // zone
         if (event.subsecond % 2) {
             watch_clear_colon();
             sprintf(buf, "%s        ", set_time_face_titles[current_page]);
@@ -154,6 +164,10 @@ bool set_time_face_loop(movement_event_t event, movement_settings_t *settings, v
             watch_set_colon();
             sprintf(buf, "%s %3d%02d  ", set_time_face_titles[current_page], (int8_t) (movement_timezone_offsets[settings->bit.time_zone] / 60), (int8_t) (movement_timezone_offsets[settings->bit.time_zone] % 60) * (movement_timezone_offsets[settings->bit.time_zone] < 0 ? -1 : 1));
         }
+    } else { // daylight savings
+        watch_clear_colon();
+        if (settings->bit.dst_active) sprintf(buf, "%s   dsT y", set_time_face_titles[current_page]);
+        else sprintf(buf, "%s   dsT n", set_time_face_titles[current_page]);
     }
 
     // blink up the parameter we're setting