source/src/vm/mz2800/serial.cpp

   1 /*
   2         SHARP MZ-2800 Emulator 'EmuZ-2800'
   3
   4         Author : Takeda.Toshiya
   5         Date   : 2015.01.17 -
   6
   7         [ serial ]
   8 */
   9
  10 #include "serial.h"
  11 #include "../z80sio.h"
  12
  13 namespace MZ2800 {
  14
  15 void SERIAL::reset()
  16 {
  17         addr_a0 = true;
  18 }
  19
  20 void SERIAL::write_io8(uint32_t addr, uint32_t data)
  21 {
  22         switch(addr & 0xff) {
  23         case 0xa0:
  24         case 0xa1:
  25         case 0xa2:
  26         case 0xa3:
  27                 if(addr_a0) {
  28                         d_sio->write_io8(addr, data);
  29                 }
  30                 break;
  31         case 0xb0:
  32         case 0xb1:
  33         case 0xb2:
  34         case 0xb3:
  35                 if(!addr_a0) {
  36                         d_sio->write_io8(addr, data);
  37                 }
  38                 break;
  39         case 0xcd:
  40                 addr_a0 = ((data & 0x80) == 0);
  41                 d_sio->set_tx_clock(0, (4000000.0 / 13.0) / (1 << ((data >> 3) & 7)));
  42                 d_sio->set_rx_clock(0, (4000000.0 / 13.0) / (1 << ((data >> 3) & 7)));
  43                 d_sio->set_tx_clock(1, (4000000.0 / 13.0) / (1 << ((data >> 0) & 7)));
  44                 d_sio->set_rx_clock(1, (4000000.0 / 13.0) / (1 << ((data >> 0) & 7)));
  45                 break;
  46         }
  47 }
  48
  49 uint32_t SERIAL::read_io8(uint32_t addr)
  50 {
  51         switch(addr & 0xff) {
  52         case 0xa0:
  53         case 0xa1:
  54         case 0xa2:
  55         case 0xa3:
  56                 if(addr_a0) {
  57                         return d_sio->read_io8(addr);
  58                 }
  59                 break;
  60         case 0xb0:
  61         case 0xb1:
  62         case 0xb2:
  63         case 0xb3:
  64                 if(!addr_a0) {
  65                         return d_sio->read_io8(addr);
  66                 }
  67                 break;
  68         }
  69         return 0xff;
  70 }
  71
  72 #define STATE_VERSION   1
  73
  74 bool SERIAL::process_state(FILEIO* state_fio, bool loading)
  75 {
  76         if(!state_fio->StateCheckUint32(STATE_VERSION)) {
  77                 return false;
  78         }
  79         if(!state_fio->StateCheckInt32(this_device_id)) {
  80                 return false;
  81         }
  82         state_fio->StateBool(addr_a0);
  83         return true;
  84 }
  85
  86 }