From 2fdb5e638e023408697be8950e776e8f8ffd2590 Mon Sep 17 00:00:00 2001
From: FIX94 <fix94.1@gmail.com>
Date: Fri, 8 Apr 2016 23:10:13 +0200
Subject: added experimental save support (only tested with EEPROM)

---
 gba/source/main.c | 134 ++++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 114 insertions(+), 20 deletions(-)

(limited to 'gba/source/main.c')

diff --git a/gba/source/main.c b/gba/source/main.c
index 9d05189..567165a 100644
--- a/gba/source/main.c
+++ b/gba/source/main.c
@@ -7,12 +7,15 @@
 #include <gba_sio.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include "libSave.h"
 
-u32 getGameSize(void)
+u8 save_data[0x20000] __attribute__ ((section (".sbss")));
+
+s32 getGameSize(void)
 {
 	if(*(vu32*)(0x08000004) != 0x51AEFF24)
-		return 0;
-	u32 i;
+		return -1;
+	s32 i;
 	for(i = (1<<20); i < (1<<25); i<<=1)
 	{
 		vu16 *rompos = (vu16*)(0x08000000+i);
@@ -30,6 +33,8 @@ u32 getGameSize(void)
 	}
 	return i;
 }
+#define JOY_WRITE 2
+#define JOY_READ 4
 //---------------------------------------------------------------------------------
 // Program entry point
 //---------------------------------------------------------------------------------
@@ -49,43 +54,132 @@ int main(void) {
 	u32 i;
 	iprintf("\x1b[9;10HROM Dumper\n");
 	iprintf("\x1b[10;5HPlease look at the TV\n");
-	REG_HS_CTRL |= 6;
+	REG_HS_CTRL |= (JOY_WRITE|JOY_READ);
+	u32 prevIrqMask = REG_IME;
 	while (1) {
-		if((REG_HS_CTRL&4))
+		if((REG_HS_CTRL&JOY_READ))
 		{
-			REG_HS_CTRL |= 4;
-			u32 gamesize = getGameSize();
+			irqDisable(IRQ_VBLANK);
+			REG_IME = 0;
+			REG_HS_CTRL |= (JOY_WRITE|JOY_READ);
+			s32 gamesize = getGameSize();
+			u32 savesize = SaveSize(save_data,gamesize);
 			REG_JOYTR = gamesize;
-			while((REG_HS_CTRL&4) == 0) ;
-			REG_HS_CTRL |= 4;
-			if(gamesize == 0)
+			//wait for a cmd receive for safety
+			while((REG_HS_CTRL&JOY_WRITE) == 0) ;
+			REG_HS_CTRL |= (JOY_WRITE|JOY_READ);
+			REG_JOYTR = savesize;
+			//wait for a cmd receive for safety
+			while((REG_HS_CTRL&JOY_WRITE) == 0) ;
+			REG_HS_CTRL |= (JOY_WRITE|JOY_READ);
+			if(gamesize == -1)
 			{
 				REG_JOYTR = 0;
+				REG_IME = prevIrqMask;
+				irqEnable(IRQ_VBLANK);
 				continue; //nothing to read
 			}
 			//game in, send header
 			for(i = 0; i < 0xC0; i+=4)
 			{
 				REG_JOYTR = *(vu32*)(0x08000000+i);
-				while((REG_HS_CTRL&4) == 0) ;
-				REG_HS_CTRL |= 4;
+				while((REG_HS_CTRL&JOY_READ) == 0) ;
+				REG_HS_CTRL |= (JOY_WRITE|JOY_READ);
 			}
+			REG_JOYTR = 0;
 			//wait for other side to choose
-			while((REG_HS_CTRL&2) == 0) ;
-			REG_HS_CTRL |= 2;
-			if(REG_JOYRE == 0)
+			while((REG_HS_CTRL&JOY_WRITE) == 0) ;
+			REG_HS_CTRL |= (JOY_WRITE|JOY_READ);
+			u32 choseval = REG_JOYRE;
+			if(choseval == 0)
 			{
 				REG_JOYTR = 0;
+				REG_IME = prevIrqMask;
+				irqEnable(IRQ_VBLANK);
 				continue; //nothing to read
 			}
-			//dump the game
-			for(i = 0; i < gamesize; i+=4)
+			else if(choseval == 1)
 			{
-				REG_JOYTR = *(vu32*)(0x08000000+i);
-				while((REG_HS_CTRL&4) == 0) ;
-				REG_HS_CTRL |= 4;
+				//dump the game
+				for(i = 0; i < gamesize; i+=4)
+				{
+					REG_JOYTR = *(vu32*)(0x08000000+i);
+					while((REG_HS_CTRL&JOY_READ) == 0) ;
+					REG_HS_CTRL |= (JOY_WRITE|JOY_READ);
+				}
+			}
+			else if(choseval == 2)
+			{
+				//backup save
+				switch (savesize){
+				case 0x200:
+					GetSave_EEPROM_512B(save_data);
+					break;
+				case 0x2000:
+					GetSave_EEPROM_8KB(save_data);
+					break;
+				case 0x8000:
+					GetSave_SRAM_32KB(save_data);
+					break;
+				case 0x10000:
+					GetSave_FLASH_64KB(save_data);
+					break;
+				case 0x20000:
+					GetSave_FLASH_128KB(save_data);
+					break;
+				default:
+					break;
+				}
+				REG_JOYTR = savesize;
+				//wait for a cmd receive for safety
+				while((REG_HS_CTRL&JOY_WRITE) == 0) ;
+				REG_HS_CTRL |= (JOY_WRITE|JOY_READ);
+				//send the save
+				for(i = 0; i < savesize; i+=4)
+				{
+					REG_JOYTR = *(vu32*)(save_data+i);
+					while((REG_HS_CTRL&JOY_READ) == 0) ;
+					REG_HS_CTRL |= (JOY_WRITE|JOY_READ);
+				}
+			}
+			else if(choseval == 3)
+			{
+				REG_JOYTR = savesize;
+				//receive the save
+				for(i = 0; i < savesize; i+=4)
+				{
+					while((REG_HS_CTRL&JOY_WRITE) == 0) ;
+					REG_HS_CTRL |= (JOY_WRITE|JOY_READ);
+					*(vu32*)(save_data+i) = REG_JOYRE;
+				}
+				//write it
+				switch (savesize){
+				case 0x200:
+					PutSave_EEPROM_512B(save_data);
+					break;
+				case 0x2000:
+					PutSave_EEPROM_8KB(save_data);
+					break;
+				case 0x8000:
+					PutSave_SRAM_32KB(save_data);
+					break;
+				case 0x10000:
+					PutSave_FLASH_64KB(save_data);
+					break;
+				case 0x20000:
+					PutSave_FLASH_128KB(save_data);
+					break;
+				default:
+					break;
+				}
+				REG_JOYTR = 0;
+				//wait for a cmd receive for safety
+				while((REG_HS_CTRL&JOY_WRITE) == 0) ;
+				REG_HS_CTRL |= (JOY_WRITE|JOY_READ);
 			}
 			REG_JOYTR = 0;
+			REG_IME = prevIrqMask;
+			irqEnable(IRQ_VBLANK);
 		}
 		Halt();
 	}
-- 
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