- 7seg is a subdevice of the VIA 6522 now, registering to

  a small sub-bus

1 files changed, 46 insertions, 0 deletions

diff --git a/emu/6522.h b/emu/6522.h
new file mode 100644
index 0000000..853bd3e
--- /dev/null
+++ b/emu/6522.h
@@ -0,0 +1,46 @@
+#ifndef VIA_6522_H
+#define VIA_6522_H
+
+#include "device.h"
+#include "bus.h"
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#ifdef WITH_GUI
+#include <SDL.h>
+#endif
+
+// the VIA connects to sub-devices itself via the bus. It also
+// has things like timers and internal registers
+// the VIA is initialized with a base address, the addresses for
+// the registers are relative to this base.
+enum {
+	PORTA = 0x01,
+	DDRA  = 0x03
+};
+
+typedef struct via_6522_t
+{
+	device_t base;
+	
+	uint16_t addr;
+	
+	uint8_t ddra;
+
+	bool debug;
+	
+	bus_t bus;
+} via_6522_t;
+
+void via_6522_init( via_6522_t *via, uint16_t addr, bool initialize );
+void via_6522_register( via_6522_t *via, device_t *device );
+
+uint8_t via_6522_read( void *obj, uint16_t addr );
+void via_6522_write( void *obj, uint16_t addr, uint8_t data );
+#ifdef WITH_GUI
+void via_6522_draw( void *obj, SDL_Renderer *renderer );
+#endif
+void via_6522_deinit( void *obj );
+
+#endif