source/src/vm/z80ctc.h

   1 /*
   2         Skelton for retropc emulator
   3
   4         Author : Takeda.Toshiya
   5         Date   : 2006.08.18 -
   6
   7         [ Z80CTC ]
   8 */
   9
  10 #ifndef _Z80CTC_H_
  11 #define _Z80CTC_H_
  12
  13 #include "vm.h"
  14 #include "../emu.h"
  15 #include "device.h"
  16
  17 #define SIG_Z80CTC_TRIG_0       0
  18 #define SIG_Z80CTC_TRIG_1       1
  19 #define SIG_Z80CTC_TRIG_2       2
  20 #define SIG_Z80CTC_TRIG_3       3
  21
  22 class Z80CTC : public DEVICE
  23 {
  24 private:
  25         struct {
  26                 uint8_t control;
  27                 bool slope;
  28                 uint16_t count;
  29                 uint16_t constant;
  30                 uint8_t vector;
  31                 int clocks;
  32                 int prescaler;
  33                 bool freeze;
  34                 bool start;
  35                 bool latch;
  36                 bool prev_in;
  37                 bool first_constant;
  38                 // constant clock
  39                 uint64_t freq;
  40                 int clock_id;
  41                 int sysclock_id;
  42                 uint32_t input;
  43                 uint32_t period;
  44                 uint32_t prev;
  45                 // interrupt
  46                 bool req_intr;
  47                 bool in_service;
  48                 // output signals
  49                 outputs_t outputs;
  50         } counter[4];
  51         uint64_t cpu_clocks;
  52
  53         void input_clock(int ch, int clock);
  54         void input_sysclock(int ch, int clock);
  55         void update_event(int ch, int err);
  56
  57         // daisy chain
  58         DEVICE *d_cpu, *d_child;
  59         bool iei, oei;
  60         uint32_t intr_bit;
  61         void update_intr();
  62
  63 public:
  64         Z80CTC(VM* parent_vm, EMU* parent_emu) : DEVICE(parent_vm, parent_emu)
  65         {
  66                 memset(counter, 0, sizeof(counter));
  67                 for(int i = 0; i < 4; i++) {
  68                         initialize_output_signals(&counter[i].outputs);
  69                         counter[i].freq = 0;
  70                         counter[i].prev_in = false;
  71                 }
  72                 d_cpu = d_child = NULL;
  73                 set_device_name(_T("Z80 CTC"));
  74         }
  75         ~Z80CTC() {}
  76
  77         // common functions
  78         void reset();
  79         void write_io8(uint32_t addr, uint32_t data);
  80         uint32_t read_io8(uint32_t addr);
  81         void write_signal(int id, uint32_t data, uint32_t mask);
  82         void event_callback(int event_id, int err);
  83         void update_timing(int new_clocks, double new_frames_per_sec, int new_lines_per_frame)
  84         {
  85                 cpu_clocks = new_clocks;
  86         }
  87         void save_state(FILEIO* state_fio);
  88         bool load_state(FILEIO* state_fio);
  89         // interrupt common functions
  90         void set_context_intr(DEVICE* device, uint32_t bit)
  91         {
  92                 d_cpu = device;
  93                 intr_bit = bit;
  94         }
  95         void set_context_child(DEVICE* device)
  96         {
  97                 d_child = device;
  98         }
  99         void set_intr_iei(bool val);
 100         uint32_t get_intr_ack();
 101         void notify_intr_reti();
 102
 103         // unique functions
 104         void set_context_zc0(DEVICE* device, int id, uint32_t mask)
 105         {
 106                 register_output_signal(&counter[0].outputs, device, id, mask);
 107         }
 108         void set_context_zc1(DEVICE* device, int id, uint32_t mask)
 109         {
 110                 register_output_signal(&counter[1].outputs, device, id, mask);
 111         }
 112         void set_context_zc2(DEVICE* device, int id, uint32_t mask)
 113         {
 114                 register_output_signal(&counter[2].outputs, device, id, mask);
 115         }
 116         void set_constant_clock(int ch, uint32_t hz)
 117         {
 118                 counter[ch].freq = hz;
 119         }
 120 };
 121
 122 #endif