How do I get this clock to update every minute with the ticker service? - pebble-sdk

Question

I am making a super simple watchface for the pebble using SDK 2. The watchface compiles and install but the clock does not update. I have attached my code below. Any ideas?
#include <pebble.h>
static Window *s_main_window;
static TextLayer *s_time_layer;
static TextLayer *s_date_layer;
static GFont s_time_font;
static BitmapLayer *s_background_layer;
static GBitmap *s_background_bitmap;
static void update_time() {
// Get a tm structure
time_t temp = time(NULL);
struct tm *tick_time = localtime(&temp);
// Create a long-lived buffer
static char buffer[] = ">00:00";
// Write the current hours and minutes into the buffer
if(clock_is_24h_style() == true) {
//Use 2h hour format
strftime(buffer, sizeof(">00:00"), ">%H:%M", tick_time);
} else {
//Use 12 hour format
strftime(buffer, sizeof(">00:00"), ">%I:%M", tick_time);
}
// Display this time on the TextLayer
text_layer_set_text(s_time_layer, buffer);
}
static void update_date(){
time_t temp = time(NULL);
struct tm *tick_time = localtime(&temp);
static char buffer[] = ">00/00/00";
strftime(buffer, sizeof(">00/00/00"), ">%D", tick_time);
text_layer_set_text(s_date_layer, buffer);
}
static void main_window_load(Window *window) {
//Create Gbitmap, then set to created bitmap layer
s_background_bitmap = gbitmap_create_with_resource(RESOURCE_ID_lenny);
s_background_layer = bitmap_layer_create(GRect(0, 0, 144, 168));
bitmap_layer_set_bitmap(s_background_layer, s_background_bitmap);
layer_add_child(window_get_root_layer(window), bitmap_layer_get_layer(s_background_layer));
// Create time TextLayer
s_time_layer = text_layer_create(GRect(5, 90, 144, 50));
text_layer_set_background_color(s_time_layer, GColorClear);
text_layer_set_text_color(s_time_layer, GColorBlack);
text_layer_set_text(s_time_layer, ">00:00");
//Create date TextLayer
s_date_layer = text_layer_create(GRect(5, 115, 144, 50));
text_layer_set_background_color(s_date_layer, GColorClear);
text_layer_set_text_color(s_date_layer, GColorBlack);
text_layer_set_text(s_date_layer, ">00/00/00");
//Create GFont
s_time_font = fonts_load_custom_font(resource_get_handle(RESOURCE_ID_arial25));
//Apply to TextLayer
text_layer_set_font(s_time_layer, s_time_font);
text_layer_set_text_alignment(s_time_layer, GTextAlignmentLeft);
text_layer_set_font(s_date_layer, s_time_font);
text_layer_set_text_alignment(s_date_layer, GTextAlignmentLeft);
// Add it as a child layer to the Window's root layer
layer_add_child(window_get_root_layer(window), text_layer_get_layer(s_time_layer));
layer_add_child(window_get_root_layer(window), text_layer_get_layer(s_date_layer));
// Make sure the time is displayed from the start
update_time();
update_date();
}
static void main_window_unload(Window *window) {
//Unload GFont
fonts_unload_custom_font(s_time_font);
// Destroy TextLayer
text_layer_destroy(s_time_layer);
//Destroy Gbitmap
gbitmap_destroy(s_background_bitmap);
//Destroy BitmapLayer
bitmap_layer_destroy(s_background_layer);
//Destroy datelayer
text_layer_destroy(s_date_layer);
}
static void tick_handler(struct tm *tick_time, TimeUnits units_changed) {
update_time();
}
static void tick_handler_date(struct tm *tick_time, TimeUnits units_changed){
update_date();
}
static void init() {
// Create main Window element and assign to pointer
s_main_window = window_create();
// Set handlers to manage the elements inside the Window
window_set_window_handlers(s_main_window, (WindowHandlers) {
.load = main_window_load,
.unload = main_window_unload
});
// Show the Window on the watch, with animated=true
window_stack_push(s_main_window, true);
// Register with TickTimerService
tick_timer_service_subscribe(MINUTE_UNIT, tick_handler);
tick_timer_service_subscribe(DAY_UNIT, tick_handler_date);
}
static void deinit() {
// Destroy Window
window_destroy(s_main_window);
}
int main(void) {
init();
app_event_loop();
deinit();
}
There is a true type font being used as well as a png. These can be replaced with anything for testing purposes as long as the reference ID's in the code are changed as well. Any help is greatly appreciated. Thanks !

Answer 1

It's because you override checking every minute and updating the time here:
tick_timer_service_subscribe(DAY_UNIT, tick_handler_date);
tick_timer_service_subscribe takes a unit and a function pointer. When you called it the second time you overrode the unit and the function pointer.
Instead you should call it once with MINUTE_UNIT and tick_handler. Then inside tick_handler write a new function called update_date_and_time. This function does what it says, updates the date and the time. You'll unnecessarily update the date most of the time, but that's okay, because you'll correctly update the time.