494 lines
11 KiB
C
494 lines
11 KiB
C
/* *************************************
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* Includes
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* *************************************/
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#include "System.h"
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/* *************************************
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* Defines
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* *************************************/
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#define SYSTEM_MAX_TIMERS 16
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#define FILE_BUFFER_SIZE 0xC40
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#define END_STACK_PATTERN (uint32_t) 0x18022015
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#define BEGIN_STACK_ADDRESS (uint32_t*) 0x801FFF00
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#define STACK_SIZE 0x1000
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#define I_MASK (*(volatile unsigned int*)0x1F801074)
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/* *************************************
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* Local Prototypes
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* *************************************/
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static void SystemSetStackPattern(void);
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/* *************************************
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* Local Variables
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* *************************************/
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//Buffer to store any kind of files. It supports files up to 128 kB
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static uint8_t file_buffer[FILE_BUFFER_SIZE];
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//Global timer (called by interrupt)
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static volatile uint64_t global_timer;
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//Tells whether rand seed has been set
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static bool rand_seed;
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//Screen refresh flag (called by interrupt)
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static volatile bool refresh_needed;
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//Timers
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static bool one_second_timer;
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//Critical section is entered (i.e.: when accessing fopen() or other BIOS functions
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static volatile bool system_busy;
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/* *******************************************************************
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*
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* @name: void SystemInit(void)
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*
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* @author: Xavier Del Campo
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*
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* @brief: Calls main intialization routines.
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*
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* @remarks: To be called before main loop.
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*
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* *******************************************************************/
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void SystemInit(void)
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{
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//Reset global timer
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global_timer = 0;
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//Reset 1 second timer
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one_second_timer = 0;
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//PSXSDK init
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PSX_InitEx(PSX_INIT_SAVESTATE | PSX_INIT_CD);
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//Graphics init
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GsInit();
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//Clear VRAM
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GsClearMem();
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//Set Video Resolution
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#ifdef _PAL_MODE_
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GsSetVideoMode(X_SCREEN_RESOLUTION, Y_SCREEN_RESOLUTION, VMODE_PAL);
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#else
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GsSetVideoMode(X_SCREEN_RESOLUTION, Y_SCREEN_RESOLUTION, VMODE_NTSC);
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#endif //_PAL_MODE_
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//SPU init
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SsInit();
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//Set Drawing Environment
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GfxInitDrawEnv();
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//Set Display Environment
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GfxInitDispEnv();
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//Set Primitive List
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GfxSetPrimitiveList();
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//Initial value for system_busy
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system_busy = false;
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GfxSetGlobalLuminance(NORMAL_LUMINANCE);
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SystemSetStackPattern();
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}
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size_t SystemGetBufferSize(void)
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{
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return sizeof(file_buffer);
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}
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/* *******************************************************************
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*
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* @name: void SystemInit(void)
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*
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* @author: Xavier Del Campo
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*
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* @brief:
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* Calls srand() while avoiding multiple calls by setting internal
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* variable rand_seed to true. Internal variable "global_timer" is
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* used to generate the new seed.
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*
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* @remarks:
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* It is recommended to call it once user has pressed any key.
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*
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* *******************************************************************/
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void SystemSetRandSeed(void)
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{
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if(rand_seed == false)
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{
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rand_seed = true;
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//Set random seed using global timer as reference
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srand((unsigned int)global_timer);
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dprintf("Seed used: %d\n",(unsigned int)global_timer);
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}
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}
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/* *******************************************************************
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*
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* @name: bool SystemIsRandSeedSet(void)
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*
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* @author: Xavier Del Campo
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*
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* @brief:
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* Reportedly, returns whether rand seed has already been set.
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*
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* @remarks:
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*
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* @return:
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* Reportedly, returns whether rand seed has already been set.
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*
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* *******************************************************************/
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bool SystemIsRandSeedSet(void)
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{
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return rand_seed;
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}
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/* *******************************************************************
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*
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* @name: bool SystemRefreshNeeded(void)
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*
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* @author: Xavier Del Campo
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*
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* @brief:
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*
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* @remarks:
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*
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* @return:
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* Returns whether VSync flag has been enabled.
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*
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* *******************************************************************/
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bool SystemRefreshNeeded(void)
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{
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return refresh_needed;
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}
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/* *******************************************************************
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*
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* @name: void ISR_SystemDefaultVBlank(void)
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*
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* @author: Xavier Del Campo
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*
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* @brief:
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*
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* @remarks:
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* Called from VSync interrupt. Called 50 times a second in PAL mode,
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* 60 times a second in NTSC mode.
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*
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* *******************************************************************/
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void ISR_SystemDefaultVBlank(void)
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{
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refresh_needed = true;
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SystemIncreaseGlobalTimer();
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}
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/* *******************************************************************
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*
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* @name: void SystemIncreaseGlobalTimer(void)
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*
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* @author: Xavier Del Campo
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*
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* @brief:
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* Increases internal variable responsible for time handling.
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*
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* @remarks:
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* Usually called from ISR_SystemDefaultVBlank().
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*
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* *******************************************************************/
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void SystemIncreaseGlobalTimer(void)
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{
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global_timer++;
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}
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/* *******************************************************************
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*
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* @name: uint64_t SystemGetGlobalTimer(void)
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*
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* @author: Xavier Del Campo
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*
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* @brief: Returns internal global timer value.
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*
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* *******************************************************************/
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uint64_t SystemGetGlobalTimer(void)
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{
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return global_timer;
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}
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/* *******************************************************************
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*
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* @name: void SystemDisableScreenRefresh(void)
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*
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* @author: Xavier Del Campo
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*
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* @brief: Resets VBlank IRQ flag.
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*
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* *******************************************************************/
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void SystemDisableScreenRefresh(void)
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{
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refresh_needed = false;
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}
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/* *******************************************************************
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*
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* @name: bool System1SecondTick(void)
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*
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* @author: Xavier Del Campo
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*
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* @return: bool variable with a 1-cycle-length pulse that gets
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* set each second.
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*
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* *******************************************************************/
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bool System1SecondTick(void)
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{
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return !(global_timer % REFRESH_FREQUENCY);
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}
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/* ****************************************************************************************
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*
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* @name bool SystemLoadFileToBuffer(char* fname, uint8_t* buffer, uint32_t szBuffer)
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*
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* @author: Xavier Del Campo
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*
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* @brief: Given an input path, it fills a buffer pointed to by "buffer" with
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* maximum size "szBuffer" with data from CD-ROM.
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*
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* @return: true if file has been loaded successfully, false otherwise.
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*
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* ****************************************************************************************/
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bool SystemLoadFileToBuffer(char* fname, uint32_t init_pos, uint8_t* buffer, uint32_t szBuffer)
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{
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FILE *f;
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int32_t size;
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// Wait for possible previous operation from the GPU before entering this section.
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while( (SystemIsBusy() == true) || (GfxIsGPUBusy() == true) );
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if(fname == NULL)
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{
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dprintf("SystemLoadFile: NULL fname!\n");
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return false;
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}
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memset(buffer,0,szBuffer);
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system_busy = true;
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SystemDisableVBlankInterrupt();
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f = fopen(fname, "r");
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if(f == NULL)
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{
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dprintf("SystemLoadFile: file could not be found!\n");
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//File couldn't be found
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return false;
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}
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fseek(f, init_pos, SEEK_END);
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size = ftell(f);
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if(size > szBuffer)
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{
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dprintf("SystemLoadFile: Exceeds file buffer size (%d bytes)\n",size);
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//Bigger than 128 kB (buffer's max size)
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return false;
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}
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fseek(f, init_pos, SEEK_SET); //f->pos = 0;
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fread(buffer, sizeof(char), size, f);
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fclose(f);
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SystemEnableVBlankInterrupt();
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system_busy = false;
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dprintf("File \"%s\" loaded successfully!\n",fname);
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return true;
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}
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void SystemSetBusyFlag(bool value)
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{
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system_busy = value;
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}
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/* ****************************************************************************************
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*
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* @name bool SystemLoadFile(char*fname)
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*
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* @author: Xavier Del Campo
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*
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* @brief: Given an input file name, it loads its conents into internal buffer.
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*
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* @return: true if file has been loaded successfully, false otherwise.
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*
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* ****************************************************************************************/
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bool SystemLoadFile(char*fname)
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{
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return SystemLoadFileToBuffer(fname,0,file_buffer,sizeof(file_buffer));
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}
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/* ******************************************************************
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*
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* @name uint8_t* SystemGetBufferAddress(void)
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*
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* @author: Xavier Del Campo
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*
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* @return: Reportedly, returns internal buffer initial address.
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*
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* *****************************************************************/
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uint8_t* SystemGetBufferAddress(void)
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{
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return file_buffer;
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}
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/* ******************************************************************
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*
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* @name void SystemClearBuffer(void)
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*
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* @author: Xavier Del Campo
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*
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* @return: Fills internal buffer with zeros
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*
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* *****************************************************************/
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void SystemClearBuffer(void)
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{
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memset(file_buffer, 0, sizeof(file_buffer));
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}
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/* ******************************************************************
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*
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* @name uint32_t SystemRand(uint32_t min, uint32_t max)
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*
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* @author: Xavier Del Campo
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*
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* @return: random number between "min" and "max".
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*
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* @remarks: rand seed must be set before using this function, or
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* you will predictable values otherwise!
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*
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* *****************************************************************/
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uint32_t SystemRand(uint32_t min, uint32_t max)
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{
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return rand() % (max - min + 1) + min;
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}
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/* ***********************************************************************
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*
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* @name volatile bool SystemIsBusy(void)
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*
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* @author: Xavier Del Campo
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*
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* @return: returns system busy flag.
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*
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* ***********************************************************************/
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volatile bool SystemIsBusy(void)
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{
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return system_busy;
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}
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bool SystemArrayCompare(unsigned short* arr1, unsigned short* arr2, size_t sz)
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{
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size_t i;
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for(i = 0; i < sz; i++)
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{
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if(arr1[i] != arr2[i])
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{
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return false;
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}
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}
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return true;
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}
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void SystemPrintStackPointerAddress(void)
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{
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#ifdef PSXSDK_DEBUG // Used to avoid unused variable warning
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void * ptr = NULL;
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fix16_t used_bytes = fix16_from_int((int)((void*)BEGIN_STACK_ADDRESS - (void*)&ptr));
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fix16_t stackPercent = fix16_sdiv(used_bytes,fix16_from_int((int)STACK_SIZE));
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stackPercent = fix16_smul(stackPercent, fix16_from_int((int)100));
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dprintf("stackPercent: %d\n", stackPercent);
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dprintf("Stack begin pointer: 0x%08X\n"
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"Stack pointer address: 0x%08X\n"
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"Used %d%% of stack size.\n"
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"\tUsed bytes: %d\n",
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(void*)BEGIN_STACK_ADDRESS,
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(void*)&ptr,
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fix16_to_int(stackPercent),
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fix16_to_int(used_bytes) );
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#endif // PSXSDK_DEBUG
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}
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void SystemCheckStack(void)
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{
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uint32_t * ptrStack = BEGIN_STACK_ADDRESS;
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uint32_t data;
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ptrStack -= STACK_SIZE;
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data = (*ptrStack);
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if(data != END_STACK_PATTERN)
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{
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dprintf("Stack overflow?\n");
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while(1);
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}
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}
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void SystemSetStackPattern(void)
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{
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uint32_t * ptrStack = BEGIN_STACK_ADDRESS;
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ptrStack -= STACK_SIZE;
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*ptrStack = END_STACK_PATTERN;
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}
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int32_t SystemIndexOfStringArray(char* str, char** array)
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{
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int32_t i;
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for(i = 0; array[i] != NULL; i++)
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{
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dprintf("String to find: %s\nEntry: %s\n", str, array[i]);
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if(strcmp(str, array[i]) == 0)
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{
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dprintf("Match! Returning index %d...\n", i);
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return i;
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}
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}
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return -1;
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}
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void SystemCyclicHandler(void)
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{
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SystemDisableScreenRefresh();
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SystemCheckStack();
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}
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void SystemDisableVBlankInterrupt(void)
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{
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I_MASK &= ~(0x00000001);
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}
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void SystemEnableVBlankInterrupt(void)
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{
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I_MASK |= (0x00000001);
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}
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