From 9490b470f3c0ac2357b60a56a893ab86556af634 Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Sat, 2 Jan 2021 20:23:52 +0100
Subject: added VIA added some more opcodes (SEI, CLI)

---
 emu/6522.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 57 insertions(+), 11 deletions(-)

(limited to 'emu/6522.c')

diff --git a/emu/6522.c b/emu/6522.c
index df9144d..7cde206 100644
--- a/emu/6522.c
+++ b/emu/6522.c
@@ -22,14 +22,37 @@ void via_6522_init( via_6522_t *via, uint16_t addr, bool initialize )
 	
 	if( initialize ) {
 		via->ddra = 0x00;
+		via->ddrb = 0x00;
+		via->pcr = 0x00;
+		via->ier = 0x00;
 	}
 	
-	bus_init( &via->bus );
+	bus_init( &via->busa );
+	bus_init( &via->busb );
 }
 
-void via_6522_register( via_6522_t *via, device_t *device )
+void via_6522_reset( via_6522_t *via )
 {
-	bus_register( &via->bus, device, 0, 0 );
+	via->ddra = 0x00;
+	via->ddrb = 0x00;
+	via->pcr = 0x00;
+	via->ier = 0x00;
+}
+
+void via_6522_register( via_6522_t *via, int bus, device_t *device )
+{
+	switch( bus ) {
+		case PORTA:
+			bus_register( &via->busa, device, 0, 0 );
+			break;
+
+		case PORTB:
+			bus_register( &via->busb, device, 0, 0 );
+			break;
+
+		default:
+			fprintf( stderr, "ERROR: unable to register to VIA 6522 bus, use PORTA or PORTB\n" );
+	}
 }
 
 uint8_t via_6522_read( void *obj, uint16_t addr )
@@ -42,18 +65,38 @@ void via_6522_write( void *obj, uint16_t addr, uint8_t data )
 	via_6522_t *via = (via_6522_t *)obj;
 
 	switch( addr - via->addr ) {
-		case DDRA:
-			via->ddra = data;
-			break;
-
 		case PORTA:
 			data &= via->ddra;
-			for( int i = 0; i < via->bus.nof_devices; i++ ) {
-				device_t *device = via->bus.devices[i].device;
+			for( int i = 0; i < via->busa.nof_devices; i++ ) {
+				device_t *device = via->busa.devices[i].device;
 				device->vtable->write( device, 0, data );
 			}
 			break;
+
+		case PORTB:
+			data &= via->ddrb;
+			for( int i = 0; i < via->busb.nof_devices; i++ ) {
+				device_t *device = via->busb.devices[i].device;
+				device->vtable->write( device, 0, data );
+			}
+			break;
+
+		case DDRB:
+			via->ddrb = data;
+			break;
+			
+		case DDRA:
+			via->ddra = data;
+			break;
 		
+		case PCR:
+			via->pcr = data;
+			break;
+			
+		case IER:
+			via->ier = data;
+			break;
+				
 		default:
 			fprintf( stderr, "ERROR: VIA 6522 not implemented address '%04X', data: '%02X'\n", addr, data );
 			break;
@@ -65,7 +108,8 @@ void via_6522_draw( void *obj, SDL_Renderer *renderer )
 {
 	via_6522_t *via = (via_6522_t *)obj;
 
-	via->bus.base.vtable->draw( &via->bus, renderer );
+	via->busa.base.vtable->draw( &via->busa, renderer );
+	via->busb.base.vtable->draw( &via->busb, renderer );
 }
 #endif
 
@@ -73,6 +117,8 @@ void via_6522_deinit( void *obj )
 {
 	via_6522_t *via = (via_6522_t *)obj;
 
-	bus_deinit( &via->bus );
+	bus_deinit( &via->busa );
+	bus_deinit( &via->busb );
+	
 	device_deinit( &via->base );
 }
-- 
cgit v1.2.3-54-g00ecf