Add time_rtc example

ctru-rs/Cargo.toml

@@ -15,6 +15,6 @@ ctru-sys = { path = "../ctru-sys", version = "0.4" }
 const-zero = "0.1.0"
 linker-fix-3ds = { git = "https://github.com/Meziu/rust-linker-fix-3ds.git" }
 pthread-3ds = { git = "https://github.com/Meziu/pthread-3ds.git" }
-libc = { git = "https://github.com/Meziu/libc.git" }
+libc = "0.2"
 bitflags = "1.0.0"
 widestring = "0.2.2"

ctru-rs/examples/time_rtc.rs

@@ -0,0 +1,118 @@
+use std::ptr;
+
+use ctru::console::Console;
+use ctru::gfx::{Gfx, Screen};
+use ctru::services::apt::Apt;
+use ctru::services::hid::{Hid, KeyPad};
+
+const MONTHS: [&str; 12] = [
+    "January",
+    "February",
+    "March",
+    "April",
+    "May",
+    "June",
+    "July",
+    "August",
+    "September",
+    "October",
+    "November",
+    "December",
+];
+
+const WEEKDAYS: [&str; 7] = [
+    "Sunday",
+    "Monday",
+    "Tuesday",
+    "Wednesday",
+    "Thursday",
+    "Friday",
+    "Saturday",
+];
+
+const MONTH_TO_WEEKDAY_TABLE: [i32; 12] = [
+    0 % 7,   //january    31
+    31 % 7,  //february   28+1(leap year)
+    59 % 7,  //march      31
+    90 % 7,  //april      30
+    120 % 7, //may        31
+    151 % 7, //june       30
+    181 % 7, //july       31
+    212 % 7, //august     31
+    243 % 7, //september  30
+    273 % 7, //october    31
+    304 % 7, //november   30
+    334 % 7, //december   3
+];
+
+fn is_leap_year(year: i32) -> bool {
+    year % 4 == 0 && !(year % 100 == 0 && year % 400 != 0)
+}
+
+/// <http://en.wikipedia.org/wiki/Calculating_the_day_of_the_week>
+fn get_day_of_week(mut day: i32, month: usize, mut year: i32) -> usize {
+    day += 2 * (3 - ((year / 100) % 4));
+    year %= 100;
+    day += year + (year / 4);
+    day += MONTH_TO_WEEKDAY_TABLE[month]
+        - if is_leap_year(year) && month <= 1 {
+            1
+        } else {
+            0
+        };
+    (day % 7).try_into().expect("day is not valid usize")
+}
+
+fn main() {
+    ctru::init();
+
+    let gfx = Gfx::default();
+    let hid = Hid::init().expect("Couldn't obtain HID controller");
+    let apt = Apt::init().expect("Couldn't obtain APT controller");
+
+    let _console = Console::init(&gfx, Screen::Top);
+
+    print!("\x1b[30;16HPress Start to exit.");
+
+    // Main loop
+    while apt.main_loop() {
+        // Scan all the inputs. This should be done once for each frame
+        hid.scan_input();
+
+        if hid.keys_down().contains(KeyPad::KEY_START) {
+            break;
+        }
+
+        // Get the current time. ctru_sys bindings should be used rather than
+        // plain libc ones, for reasons I don't understand yet...
+        let unix_time: ctru_sys::time_t = unsafe { ctru_sys::time(std::ptr::null_mut()) };
+        let time = unsafe { ptr::read(ctru_sys::gmtime(&unix_time as *const _)) };
+
+        let hours = time.tm_hour;
+        let minutes = time.tm_min;
+        let seconds = time.tm_sec;
+        let day = time.tm_mday;
+        let month = time.tm_mon;
+        let year = time.tm_year + 1900;
+
+        let month: usize = month.try_into().expect("month is not valid usize");
+
+        println!("\x1b[1;1H{:0>2}:{:0>2}:{:0>2}", hours, minutes, seconds);
+        print!(
+            "{} {} {} {}",
+            WEEKDAYS
+                .get(get_day_of_week(day, month, year))
+                .expect("invalid weekday"),
+            MONTHS[month],
+            day,
+            year
+        );
+
+        // Flush and swap framebuffers
+        gfx.flush_buffers();
+        gfx.swap_buffers();
+
+        //Wait for VBlank
+        gfx.wait_for_vblank();
+    }
+}