aiie/apple/sy6522.h
2017-02-24 10:15:17 -05:00

55 lines
1.3 KiB
C++

#ifndef __SY6522_H
#define __SY6522_H
#include <stdint.h>
#include "ay8910.h"
// 6522 interface registers
enum {
SY_ORB = 0x00, // ORB
SY_ORA = 0x01, // ORA
SY_DDRB = 0x02, // DDRB
SY_DDRA = 0x03, // DDRA
SY_TMR1L = 0x04, // TIMER1L_COUNTER
SY_TMR1H = 0x05, // TIMER1H_COUNTER
SY_TMR1LL = 0x06, // TIMER1L_LATCH
SY_TMR1HL = 0x07, // TIMER1H_LATCH
SY_TMR2L = 0x08, // TIMER2L
SY_TMR2H = 0x09, // TIMER2H
SY_SS = 0x0a, // SERIAL_SHIFT
SY_ACR = 0x0b, // ACR
SY_PCR = 0x0c, // PCR
SY_IFR = 0x0d, // IFR
SY_IER = 0x0e, // IER
SY_ORANOHS = 0x0f // ORA_NO_HS
};
class SY6522 {
public:
SY6522();
uint8_t read(uint8_t address);
void write(uint8_t address, uint8_t val);
void update(uint32_t cycles);
private:
uint8_t ORB; // port B
uint8_t ORA; // port A
uint8_t DDRB; // data direction register
uint8_t DDRA; //
uint16_t T1_CTR; // counters
uint16_t T1_CTR_LATCH;
uint16_t T2_CTR;
uint16_t T2_CTR_LATCH;
uint8_t ACR; // Aux Control Register
uint8_t PCR; // Peripheral Control Register
uint8_t IFR; // Interrupt Flag Register
uint8_t IER; // Interrupt Enable Register
AY8910 ay8910[1]; // FIXME: an array in case we support more than one ... ?
};
#endif