1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/dssleep.c	Fri Mar 13 00:39:12 2009 -0700
     1.3 @@ -0,0 +1,35 @@
     1.4 +#include <nds.h>
     1.5 +
     1.6 +/* 
     1.7 +by Mighty Max and melw,
     1.8 +after http://forum.gbadev.org/viewtopic.php?t=12011
     1.9 +*/
    1.10 +
    1.11 +int needLidSleep(void) {
    1.12 +  // when reading keys
    1.13 +  if (IPC->buttons & 0x0080) {
    1.14 +    /* hinge is closed */
    1.15 +    
    1.16 +    /* Step 1: Turn off all interrupts but vblank for waking up */
    1.17 +    unsigned long oldIE = REG_IE;
    1.18 +    REG_IE = IRQ_VBLANK;
    1.19 +
    1.20 +    /* Step 2: Power off most of the system */
    1.21 +    powerOFF(POWER_LCD);
    1.22 +
    1.23 +    /* Step 3: Wait one vblank at a time until the ARM7 tells us
    1.24 +       that the lid is no longer closed */
    1.25 +    while (IPC->buttons & 0x0080) {
    1.26 +      swiWaitForVBlank();
    1.27 +    }
    1.28 +
    1.29 +    /* Step 4: Wait a bit more (necessary?) */
    1.30 +    swiWaitForVBlank();
    1.31 +
    1.32 +    /* Step 5: Restore old machine state */
    1.33 +    powerON(POWER_LCD);
    1.34 +    REG_IE = oldIE;
    1.35 +    return 1;
    1.36 +  }
    1.37 +  return 0;
    1.38 +}