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r65emu/acia.h
2023-10-20 13:01:15 +01:00

62 lines
1.8 KiB
C++

#ifndef __ACIA_H__
#define __ACIA_H__
// Motorola 6850 ACIA
class ACIA {
public:
void write(Memory::address, uint8_t);
uint8_t read(Memory::address);
ACIA(serialio &s): _serial(&s) {}
void set_device(serialio *s) { _serial = s; }
// status bits
//
static const uint8_t rdrf = 1 << 0;
static const uint8_t tdre = 1 << 1;
static const uint8_t dcd = 1 << 2;
static const uint8_t cts = 1 << 3;
static const uint8_t fe = 1 << 4;
static const uint8_t ovrn = 1 << 5;
static const uint8_t pc = 1 << 6;
static const uint8_t irq = 1 << 7;
// control operations (four combinable groups)
//
static const uint8_t cd1 = 0x00; // divide by 1
static const uint8_t cd16 = 0x01; // divide by 16
static const uint8_t cd64 = 0x02; // divide by 64
static const uint8_t reset = 0x03; // master reset
static const uint8_t cd_mask = 0x03;
static const uint8_t ws7e2 = 0 << 2; // 7-bits, even parity, 2-stop
static const uint8_t ws7o2 = 1 << 2;
static const uint8_t ws7e1 = 2 << 2;
static const uint8_t ws7o1 = 3 << 2;
static const uint8_t ws8n2 = 4 << 2; // 8-bits, no parity, 2-stop
static const uint8_t ws8n1 = 5 << 2;
static const uint8_t ws8e1 = 6 << 2;
static const uint8_t ws8o1 = 7 << 2;
static const uint8_t ws_mask = 0x1c;
static const uint8_t lrts_dti = 0 << 5; // /rts, disable trans irq
static const uint8_t lrts_eti = 1 << 5; // /rts, enable
static const uint8_t hrts_dti = 2 << 5; // rts, disable
static const uint8_t lrts_dti_brk = 3 << 5; // /rts, disable, send brk
static const uint8_t tc_mask = 0x60;
static const uint8_t eri = 1 << 7; // enable receive interrupt
protected:
// overrideable device memory interface
virtual uint8_t read_status();
virtual uint8_t read_data();
virtual void write_control(uint8_t);
virtual void write_data(uint8_t);
private:
serialio *_serial;
};
#endif