Allow setting timezone offset in beats app

firmware/apps/beats.c

@@ -8,7 +8,12 @@
 #include "libs/beats.h"
 #include <stdio.h>
 
-int ticks;
+#define CURRENT_UTC_OFFSET 4
+
+static int ticks;
+static int setting_offet=0;
+
+static int16_t utc_offset = CURRENT_UTC_OFFSET;
 
 //! Initialize the beats.
 void beats_init() {
@@ -20,17 +25,28 @@ int beats_exit() {
     return 0;
 };
 
-//! Draw the beats.
+static void draw_setting_offset() {
-void beats_draw() {
+    lcd_cleardigit(7);
+    lcd_char(6, 'u');
+    lcd_char(5, 't');
+    lcd_char(4, 'c');
+    lcd_cleardigit(3);
+    lcd_char(2, utc_offset > -1 ? ' ' : '-');
+    uint16_t unsigned_offset = utc_offset > 0 ? utc_offset : (0 - utc_offset);
+    lcd_digit(1, (unsigned_offset / 10) % 10);
+    lcd_digit(0, unsigned_offset % 10);
+}
+
+static void draw_beats(int forced) {
     ticks++;
     // don't re-draw unless 30 seconds have passed
     // a "beat" is 86.4 seconds but I can't think of a good way to keep track
     // of how far along we are in a beat
-    if (ticks < 4 * 30 && ticks != 0) {
+    if (!forced && ticks < 4 * 30 && ticks != 0) {
         return;
     }
     ticks = 0;
-    uint16_t beats = clock2beats(RTCHOUR, RTCMIN, RTCSEC);
+    uint16_t beats = clock2beats(RTCHOUR, RTCMIN, RTCSEC, utc_offset);
    
     lcd_digit(7, (beats / 100) % 10);
     lcd_digit(6,(beats / 10) % 10);
@@ -42,7 +58,34 @@ void beats_draw() {
     lcd_char(0, 's');
 };
 
+//! Draw the beats.
+void beats_draw(int forced) {
+    if(sidebutton_set()){
+        setting_offet=!setting_offet;
+        forced = 1;
+    }
+
+    if (setting_offet) {
+        draw_setting_offset();
+    } else {
+        draw_beats(forced);
+    }
+}
+
 //! A button has been pressed for the beats.
 int beats_keypress(char ch) {
-    return 1;
+    if(setting_offet) {
+        switch(ch) {
+        case '-':
+            utc_offset--;
+            return 1;
+        case '+':
+            utc_offset++;
+            return 1;
+        default:
+            return 0;
+        }
+    } else {
+        return 0;
+    }
 };

firmware/libs/beats.c

@@ -10,13 +10,11 @@
 
 #include <stdint.h>
 
-#define UTC_OFFSET 4
+uint16_t clock2beats(uint16_t hours, uint16_t minutes, uint16_t seconds, int16_t utc_offset) {
-
-uint16_t clock2beats(uint16_t hours, uint16_t minutes, uint16_t seconds) {
     uint32_t beats = seconds;
     beats += 60 * minutes;
     beats += (uint32_t)hours * 60 * 60; //explicit hour cast to work with 16-bit MSP430 arch
-    beats += (UTC_OFFSET + 1) * 60 * 60; // offset from utc + 1 since beats in in UTC+1
+    beats += (utc_offset + 1) * 60 * 60; // offset from utc + 1 since beats in in UTC+1
 
     beats /= 86.4; // convert to beats
     beats %= 1000; // truncate to 3 digits for overflow
@@ -29,6 +27,8 @@ uint16_t clock2beats(uint16_t hours, uint16_t minutes, uint16_t seconds) {
 #include <stdio.h>
 #include <time.h>
 
+#define UTC_OFFSET 4
+
 int main(void) {
     time_t rawtime;
     struct tm * timeinfo;
@@ -36,8 +36,7 @@ int main(void) {
     time(&rawtime);
     timeinfo = localtime(&rawtime);
     printf("Current local time and date: %s", asctime(timeinfo));
-    printf("%u\n", timeinfo->tm_hour);
+    uint16_t beats = clock2beats(timeinfo->tm_hour, timeinfo->tm_min, timeinfo->tm_sec, UTC_OFFSET);
-    uint16_t beats = clock2beats(timeinfo->tm_hour, timeinfo->tm_min, timeinfo->tm_sec);
     printf("@%u\n", beats);
 }
 

firmware/libs/beats.h

@@ -8,4 +8,4 @@
   https://en.wikipedia.org/wiki/Swatch_Internet_Time
 */
 
-uint16_t clock2beats(uint16_t hours, uint16_t minutes, uint16_t seconds);
+uint16_t clock2beats(uint16_t hours, uint16_t minutes, uint16_t seconds, int16_t utc_offset);