Rewritten the irq handler

linker-files/module.scm

@@ -4,8 +4,8 @@
 	(memory firstPage (address (#x100 . #x1ff)) (section stack))
     (memory reserved (address (#x200 . #x1fff)) (type ram))
 	(memory displayPage1 (address (#x2000 . #x3fff)) (type ram))
-	(memory upperProg (address (#x4000 . #x93ff)) (type ram) (section (programStart #x4000) startup code switch idata cdata data_init_table))
+	(memory upperProg (address (#x4000 . #x935f)) (type ram) (section (programStart #x4000) startup code switch idata cdata data_init_table))
-	(memory upperData (address (#x9400 . #x99ff)) (type ram) (section cstack zdata data heap))
+	(memory upperData (address (#x9360 . #x99ff)) (type ram) (section cstack zdata data heap intrzp))
 	(memory sharedMem (address (#x9a00 . #x9bff)) (type ram)) ;;; This memory page will be used to pass parameters and data between the master and the modules, and to save the game state
 	(memory diskBuffer (address (#x9c00 . #x9eff)) (type ram))
 	(memory zeroPageBackup (address (#x9f00 . #x9fff)) (type ram) (section (zpsave #x9f00)))

linker-files/vdpin_module.scm

@@ -5,7 +5,7 @@
     (memory reserved (address (#x200 . #x1fff)) (type ram))
 	(memory displayPage1 (address (#x2000 . #x3fff)) (type ram))
 	(memory upperProg (address (#x4000 . #x7fff)) (type ram) (section (programStart #x4000) startup code switch idata cdata data_init_table))
-	(memory upperData (address (#x8000 . #x99ff)) (type ram) (section cstack zdata data heap))
+	(memory upperData (address (#x8000 . #x99ff)) (type ram) (section cstack zdata data heap intrzp))
 	(memory sharedMem (address (#x9a00 . #x9bff)) (type ram)) ;;; This memory page will be used to pass parameters and data between the master and the modules, and to save the game state
 	(memory diskBuffer (address (#x9c00 . #x9eff)) (type ram))
 	(memory zeroPageBackup (address (#x9f00 . #x9fff)) (type ram) (section (zpsave #x9f00)))

src/vddem_main.c

@@ -43,8 +43,6 @@ static uint8_t text_buf[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
 
 static volatile uint8_t key_pressed = 0;
 
-__attribute__((interrupt)) void irq_handler(void);
-
 void main(void) {
 	uint16_t moves_count = 0;
 	uint16_t score = 0;
@@ -65,7 +63,7 @@ void main(void) {
 	vdp_switch_nt(0); // Make sure VDP shows the gamegrid
 
 	// Setup the IRQ handler
-	POKEW(IRQ_HANDLER_ADDRESS, (uint16_t)irq_handler);
+	POKEW(IRQ_HANDLER_ADDRESS, (uint16_t)vdp_irq_handler);
 	
 	// Reset the game, calculate the initial score depending on which tiles we randomly get
 	score = reset_game();
@@ -192,7 +190,3 @@ void main(void) {
 
 	return; 
 }
-
-__attribute__((interrupt)) void irq_handler(void) {
-	vdp_write_interleaved_sat();
-}

src/vddlg_main.c

@@ -64,6 +64,13 @@ void main(void) {
 		
 	if(dld->score > state_page->hi_score) { // New high-score. We need to save it.
 		state_page->hi_score = dld->score;
+
+		// Update the score!
+		num_to_decbuf(state_page->hi_score, 6, score_buf);
+		decbuf_to_ascii(6, score_buf);
+		vdp_print_string(1, 13, 12, (char*)score_buf);
+		vdp_print_string(1, 8, 13, "!NEW HIGH SCORE!");
+
 		shared_page->master_command = MASTER_COMMAND_SAVE;
 	} else {
 		shared_page->master_command = MASTER_COMMAND_NONE;

src/vdgam_main.c

@@ -39,8 +39,6 @@ static state_page_data* state_page = (state_page_data*)STATE_PAGE;
 static shared_page_data *shared_page = (shared_page_data*)SHARED_PAGE;
 static uint8_t text_buf[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
 
-__attribute__((interrupt)) void irq_handler(void);
-
 void main(void) {
 	uint16_t moves_count = 0;
 	uint16_t score = 0;
@@ -61,7 +59,7 @@ void main(void) {
 	vdp_switch_nt(0); // Make sure VDP shows the gamegrid
 
 	// Setup the IRQ handler
-	POKEW(IRQ_HANDLER_ADDRESS, (uint16_t)irq_handler);
+	POKEW(IRQ_HANDLER_ADDRESS, (uint16_t)vdp_irq_handler);
 
 	// Reset the game, calculate the initial score depending on which tiles we randomly get
 	score = reset_game();
@@ -193,8 +191,3 @@ void main(void) {
 
 	return; 
 }
-
-__attribute__((interrupt)) void irq_handler(void) {
-	vdp_write_interleaved_sat();
-}
-

src/vdp_utils.h

@@ -15,5 +15,6 @@ void vdp_switch_nt(uint8_t nt_idx);
 void vdp_print_string(uint8_t nt_idx, uint8_t x, uint8_t y, char *str);
 void vdp_set_tile(uint8_t nt_idx, uint8_t x, uint8_t y, uint8_t tile_idx);
 void vdp_write_interleaved_sat(void);
+void vdp_irq_handler(void);
 
 #endif /* _VDP_UTILS_HEADER_ */

src/vdp_utils.s

@@ -4,6 +4,10 @@
 			.extern _Zp
 			.extern VDP_MEM, VDP_REG
 
+			;;; Define a space
+			.section intrzp, noinit, root ; root, as we always require it
+			.space	0xA9
+
 			.section code,text
 
 
@@ -438,9 +442,6 @@ T_DLEN_H$:		.equ	_Zp+3
 T_DLEN_L$:		.equ	_Zp+2
 T_DATA_H$:		.equ	_Zp+1
 T_DATA_L$:		.equ	_Zp+0
-			lda		VDP_REG			; FIXME: Put this here temporarily as this is often
-									; used in interrupt handling, and we need to clear
-									; the interrupt
 
 			lda		#0x00
 			sta		zp:T_DEST_L$
@@ -490,6 +491,59 @@ WriteLoop$:
 			
 			rts
 
+_irq_save_zp:
+			ldx		#0
+			
+SaveZp$:
+			lda		zp:_Zp,x
+			sta		.sectionStart intrzp,x
+			inx
+			;cpx		#.sectionSize intrzp
+			cpx		#10		; Save only part of the ZP, we're not using more
+			bne		SaveZp$
+
+			rts
+
+_irq_restore_zp:
+			ldx		#0
+			
+RestoreZp$:
+			lda		.sectionStart intrzp,x
+			sta		zp:_Zp,x
+			inx
+			;cpx		#.sectionSize intrzp
+			cpx		#10		; Restpre only part of the ZP, we're not using more
+			bne		RestoreZp$
+
+			rts
+
+vdp_irq_handler:
+			; Save the registers
+			pha
+			txa
+			pha
+			tya
+			pha
+
+			;;; Save ZP
+			jsr		_irq_save_zp
+
+			lda		VDP_REG
+			
+			jsr		vdp_write_interleaved_sat
+
+			;;; Restore ZP
+			jsr		_irq_restore_zp
+
+			; Restore the registers
+			pla
+			tay
+			pla
+			tax
+			pla
+
+			rti
+
 ;;;;;;;;;;;;;;;;;;
 			.section data,data
 	
@@ -604,6 +658,7 @@ CurrentByteTableOffset:
 			.public vdp_set_tile
 			.public vdp_point_to_vram_xy
 			.public vdp_write_interleaved_sat
+			.public	vdp_irq_handler
 			
 			.public SpriteAttributeTable ; We'll need to set change visibility and values
 			.public NT_P0, NT_P1