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 void SERIAL::reset()
  14 {
  15         addr_a0 = true;
  16 }
  17
  18 void SERIAL::write_io8(uint32_t addr, uint32_t data)
  19 {
  20         switch(addr & 0xff) {
  21         case 0xa0:
  22         case 0xa1:
  23         case 0xa2:
  24         case 0xa3:
  25                 if(addr_a0) {
  26                         d_sio->write_io8(addr, data);
  27                 }
  28                 break;
  29         case 0xb0:
  30         case 0xb1:
  31         case 0xb2:
  32         case 0xb3:
  33                 if(!addr_a0) {
  34                         d_sio->write_io8(addr, data);
  35                 }
  36                 break;
  37         case 0xcd:
  38                 addr_a0 = ((data & 0x80) == 0);
  39                 d_sio->set_tx_clock(0, (4000000.0 / 13.0) / (1 << ((data >> 3) & 7)));
  40                 d_sio->set_rx_clock(0, (4000000.0 / 13.0) / (1 << ((data >> 3) & 7)));
  41                 d_sio->set_tx_clock(1, (4000000.0 / 13.0) / (1 << ((data >> 0) & 7)));
  42                 d_sio->set_rx_clock(1, (4000000.0 / 13.0) / (1 << ((data >> 0) & 7)));
  43                 break;
  44         }
  45 }
  46
  47 uint32_t SERIAL::read_io8(uint32_t addr)
  48 {
  49         switch(addr & 0xff) {
  50         case 0xa0:
  51         case 0xa1:
  52         case 0xa2:
  53         case 0xa3:
  54                 if(addr_a0) {
  55                         return d_sio->read_io8(addr);
  56                 }
  57                 break;
  58         case 0xb0:
  59         case 0xb1:
  60         case 0xb2:
  61         case 0xb3:
  62                 if(!addr_a0) {
  63                         return d_sio->read_io8(addr);
  64                 }
  65                 break;
  66         }
  67         return 0xff;
  68 }
  69
  70 #define STATE_VERSION   1
  71
  72 bool SERIAL::process_state(FILEIO* state_fio, bool loading)
  73 {
  74         if(!state_fio->StateCheckUint32(STATE_VERSION)) {
  75                 return false;
  76         }
  77         if(!state_fio->StateCheckInt32(this_device_id)) {
  78                 return false;
  79         }
  80         state_fio->StateBool(addr_a0);
  81         return true;
  82 }