diff options
Diffstat (limited to 'Source/System.c')
| -rw-r--r-- | Source/System.c | 145 |
1 files changed, 129 insertions, 16 deletions
diff --git a/Source/System.c b/Source/System.c index b158004..833c80f 100644 --- a/Source/System.c +++ b/Source/System.c @@ -14,6 +14,7 @@ #define END_STACK_PATTERN (uint32_t) 0x18022015 #define BEGIN_STACK_ADDRESS (uint32_t*) 0x801FFF00 #define STACK_SIZE 0x1000 +#define I_MASK (*(unsigned int*)0x1F801074) /* ************************************* * Local Prototypes @@ -21,6 +22,8 @@ static void SystemCheckTimer(bool * timer, uint64_t * last_timer, uint8_t step); static void SystemSetStackPattern(void); +static void SystemEnableVBlankInterrupt(void); +static void SystemDisableVBlankInterrupt(void); /* ************************************* * Local Variables @@ -41,16 +44,21 @@ static bool five_hundred_ms_timer; //Emergency mode flag. Toggled on pad connected/disconnected static bool emergency_mode; //Critical section is entered (i.e.: when accessing fopen() or other BIOS functions -static bool system_busy; +static volatile bool system_busy; //Timer array. static TYPE_TIMER timer_array[SYSTEM_MAX_TIMERS]; -/* ************************************* +/* ******************************************************************* + * * @name: void SystemInit(void) - * @date: 19/05/2016 + * * @author: Xavier Del Campo - * @brief: - * *************************************/ + * + * @brief: Calls main intialization routines. + * + * @remarks: To be called before main loop. + * + * *******************************************************************/ void SystemInit(void) { @@ -97,6 +105,22 @@ void SystemInit(void) StartRCnt(RCntCNT2); } +/* ******************************************************************* + * + * @name: void SystemInit(void) + * + * @author: Xavier Del Campo + * + * @brief: + * Calls srand() while avoiding multiple calls by setting internal + * variable rand_seed to true. Internal variable "global_timer" is + * used to generate the new seed. + * + * @remarks: + * It is recommended to call it once user has pressed any key. + * + * *******************************************************************/ + void SystemSetRandSeed(void) { if(rand_seed == false) @@ -109,32 +133,81 @@ void SystemSetRandSeed(void) } } +/* ******************************************************************* + * + * @name: bool SystemIsRandSeedSet(void) + * + * @author: Xavier Del Campo + * + * @brief: + * Reportedly, returns whether rand seed has already been set. + * + * @remarks: + * + * @return: + * Reportedly, returns whether rand seed has already been set. + * + * *******************************************************************/ + bool SystemIsRandSeedSet(void) { return rand_seed; } -bool SystemDMAReady(void) -{ - return (*((unsigned int*)0x1F801814) & 1<<28); -} - -bool SystemDMABusy(void) -{ - return !SystemDMAReady(); -} +/* ******************************************************************* + * + * @name: bool SystemRefreshNeeded(void) + * + * @author: Xavier Del Campo + * + * @brief: + * + * @remarks: + * + * @return: + * Returns whether VSync flag has been enabled. + * + * *******************************************************************/ bool SystemRefreshNeeded(void) { return refresh_needed; } +/* ******************************************************************* + * + * @name: void ISR_SystemDefaultVBlank(void) + * + * @author: Xavier Del Campo + * + * @brief: + * + * @remarks: + * Called from VSync interrupt. Called 50 times a second in PAL mode, + * 60 times a second in NTSC mode. + * + * *******************************************************************/ + void ISR_SystemDefaultVBlank(void) { refresh_needed = true; SystemIncreaseGlobalTimer(); } +/* ******************************************************************* + * + * @name: void SystemIncreaseGlobalTimer(void) + * + * @author: Xavier Del Campo + * + * @brief: + * Increases internal variable responsible for time handling. + * + * @remarks: + * Usually called from ISR_SystemDefaultVBlank(). + * + * *******************************************************************/ + void SystemIncreaseGlobalTimer(void) { global_timer++; @@ -201,6 +274,9 @@ bool SystemLoadFileToBuffer(char * fname, uint8_t * buffer, uint32_t szBuffer) FILE *f; int32_t size; + // Wait for possible previous operation from the GPU before entering this section. + while( (SystemIsBusy() == true) || (GfxIsGPUBusy() == true) ); + if(fname == NULL) { dprintf("SystemLoadFile: NULL fname!\n"); @@ -210,6 +286,9 @@ bool SystemLoadFileToBuffer(char * fname, uint8_t * buffer, uint32_t szBuffer) memset(buffer,0,szBuffer); system_busy = true; + + SystemDisableVBlankInterrupt(); + f = fopen(fname, "r"); if(f == NULL) @@ -219,7 +298,7 @@ bool SystemLoadFileToBuffer(char * fname, uint8_t * buffer, uint32_t szBuffer) return false; } - fseek(f, 0, SEEK_END); + fseek(f, 0, SEEK_END); size = ftell(f); @@ -236,6 +315,8 @@ bool SystemLoadFileToBuffer(char * fname, uint8_t * buffer, uint32_t szBuffer) fclose(f); + SystemEnableVBlankInterrupt(); + system_busy = false; dprintf("File \"%s\" loaded successfully!\n",fname); @@ -275,7 +356,7 @@ bool SystemGetEmergencyMode(void) return emergency_mode; } -bool SystemIsBusy(void) +volatile bool SystemIsBusy(void) { return system_busy; } @@ -515,3 +596,35 @@ int32_t SystemIndexOf_U8(uint8_t value, uint8_t * array, uint32_t from, uint32_t return -1; } + +void SystemCyclicHandler(void) +{ + if(UpdatePads() == false) + { + SystemSetEmergencyMode(true); + } + else + { + SystemSetEmergencyMode(false); + } + + SystemRunTimers(); + + SystemUserTimersHandler(); + + SystemDisableScreenRefresh(); + + MemCardHandler(); + + SystemCheckStack(); +} + +void SystemDisableVBlankInterrupt(void) +{ + I_MASK &= ~(0x0001); +} + +void SystemEnableVBlankInterrupt(void) +{ + I_MASK |= (0x0001); +} |