time/rtc/source/main.c
#include <3ds.h>
#include <stdio.h>
#include <time.h>
const char* const months[12] = {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};
const char* const weekDays[7] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
const u16 daysAtStartOfMonthLUT[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 31
};
static inline bool isLeapYear(int year)
{
return (year%4) == 0 && !((year%100) == 0 && (year%400) != 0);
}
static inline int getDayOfWeek(int day, int month, int year)
{
//http://en.wikipedia.org/wiki/Calculating_the_day_of_the_week
day += 2*(3-((year/100)%4));
year %= 100;
day += year + (year/4);
day += daysAtStartOfMonthLUT[month] - (isLeapYear(year) && (month <= 1));
return day % 7;
}
int main(int argc, char **argv)
{
// Initialize services
gfxInitDefault();
//Initialize console on top screen. Using NULL as the second argument tells the console library to use the internal console structure as current one
consoleInit(GFX_TOP, NULL);
printf("\x1b[30;16HPress Start to exit.");
// Main loop
while (aptMainLoop())
{
//Scan all the inputs. This should be done once for each frame
hidScanInput();
//hidKeysDown returns information about which buttons have been just pressed (and they weren't in the previous frame)
u32 kDown = hidKeysDown();
if (kDown & KEY_START) break; // break in order to return to hbmenu
//Print current time
time_t unixTime = time(NULL);
struct tm* timeStruct = gmtime((const time_t *)&unixTime);
int hours = timeStruct->tm_hour;
int minutes = timeStruct->tm_min;
int seconds = timeStruct->tm_sec;
int day = timeStruct->tm_mday;
int month = timeStruct->tm_mon;
int year = timeStruct->tm_year +1900;
printf("\x1b[1;1H%02i:%02i:%02i", hours, minutes, seconds);
printf("\n%s %s %i %i", weekDays[getDayOfWeek(day, month, year)], months[month], day, year);
// Flush and swap framebuffers
gfxFlushBuffers();
gfxSwapBuffers();
//Wait for VBlank
gspWaitForVBlank();
}
// Exit services
gfxExit();
return 0;
}
3ds.h
Central 3DS header.
aptMainLoop
bool aptMainLoop(void)
Main function which handles sleep mode and HOME/power buttons - call this at the beginning of every f...
consoleInit
PrintConsole * consoleInit(gfxScreen_t screen, PrintConsole *console)
Initialise the console.
gfxSwapBuffers
void gfxSwapBuffers(void)
Updates the configuration of both screens.
gfxInitDefault
void gfxInitDefault(void)
Initializes the LCD framebuffers with default parameters This is equivalent to calling:
GFX_TOP
@ GFX_TOP
Top screen.
Definition: gfx.h:26
gfxExit
void gfxExit(void)
Deinitializes and frees the LCD framebuffers.
gfxFlushBuffers
void gfxFlushBuffers(void)
Flushes the data cache for the current framebuffers.
gspWaitForVBlank
#define gspWaitForVBlank()
Waits for VBlank.
Definition: gspgpu.h:151
KEY_START
@ KEY_START
Start.
Definition: hid.h:15
hidKeysDown
u32 hidKeysDown(void)
Returns a bitmask of newly pressed buttons, this frame.
hidScanInput
void hidScanInput(void)
Scans HID for input data.
u16
uint16_t u16
16-bit unsigned integer
Definition: types.h:22
u32
uint32_t u32
32-bit unsigned integer
Definition: types.h:23