source/src/vm/jx/keyboard.cpp

   1 /*
   2         IBM Japan Ltd PC/JX Emulator 'eJX'
   3
   4         Author : Takeda.Toshiya
   5         Date   : 2011.05.10-
   6
   7         [ keyboard ]
   8 */
   9
  10 #include "keyboard.h"
  11 #include "../i8253.h"
  12 #include "../i8255.h"
  13 #include "../../fifo.h"
  14
  15 static const int key_table[256] = {
  16         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0e, 0x0f, 0x00, 0x00, 0x00, 0x1c, 0x00, 0x00,
  17         0x2a, 0x1d, 0x38, 0x46, 0x3a, 0x6f, 0x00, 0x00, 0x00, 0x6b, 0x00, 0x01, 0x6d, 0x6c, 0x00, 0x00,
  18         0x39, 0x4f, 0x5e, 0x54, 0x47, 0x4b, 0x48, 0x4d, 0x50, 0x00, 0x00, 0x00, 0x00, 0x52, 0x53, 0x00,
  19         0x0b, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  20         0x00, 0x1e, 0x30, 0x2e, 0x20, 0x12, 0x21, 0x22, 0x23, 0x17, 0x24, 0x25, 0x26, 0x32, 0x31, 0x18,
  21         0x19, 0x10, 0x13, 0x1f, 0x14, 0x16, 0x2f, 0x11, 0x2d, 0x15, 0x2c, 0x00, 0x00, 0x00, 0x00, 0x00,
  22         0x70, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x4e, 0x00, 0x4a, 0x71, 0x7c,
  23         0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x6e, 0x6f, 0x00, 0x00, 0x00, 0x00,
  24         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  25         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  26         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  27         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x28, 0x27, 0x33, 0x0c, 0x34, 0x35,
  28         0x1a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  29         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1b, 0x6A, 0x29, 0x0d, 0x00,
  30         0x00, 0x00, 0x65, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  31         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
  32 };
  33
  34 #define EVENT_SEND      0
  35 #define EVENT_TIMER     1
  36
  37 void KEYBOARD::initialize()
  38 {
  39         key_buf = new FIFO(8);
  40
  41 #ifdef KEYBOARD_HACK
  42         register_event(this, EVENT_SEND, 440 * 21, true, NULL);
  43 #else
  44         register_event(this, EVENT_SEND, 220, true, NULL);
  45 #endif
  46 #ifndef TIMER_HACK
  47         register_event_by_clock(this, EVENT_TIMER, 4, true, NULL);
  48 #endif
  49 }
  50
  51 void KEYBOARD::release()
  52 {
  53         key_buf->release();
  54         delete key_buf;
  55 }
  56
  57 void KEYBOARD::reset()
  58 {
  59         key_buf->clear();
  60 #ifndef KEYBOARD_HACK
  61         send_count = 0;
  62 #endif
  63         key_latched = false;
  64
  65         d_pio->write_signal(SIG_I8255_PORT_C, 0x00, 0x01); // clear keyboard latched
  66         d_pio->write_signal(SIG_I8255_PORT_C, 0x00, 0x40); // set stop bit
  67
  68         nmi_reg = 0;
  69 }
  70
  71 void KEYBOARD::write_io8(uint32_t addr, uint32_t data)
  72 {
  73         switch(addr) {
  74         case 0xa0:
  75                 nmi_reg = data;
  76                 break;
  77         }
  78 }
  79
  80 uint32_t KEYBOARD::read_io8(uint32_t addr)
  81 {
  82         switch(addr) {
  83         case 0xa0:
  84                 d_pio->write_signal(SIG_I8255_PORT_C, 0x00, 0x01);
  85                 key_latched = false;
  86                 return nmi_reg; // ???
  87 #ifdef KEYBOARD_HACK
  88         case 0xa1:
  89                 if(!key_buf->empty()) {
  90                         return key_buf->read();
  91                 }
  92                 break;
  93 #endif
  94         }
  95         return 0xff;
  96 }
  97
  98 void KEYBOARD::event_callback(int id, int err)
  99 {
 100         if(id == EVENT_SEND) {
 101 #ifdef KEYBOARD_HACK
 102                 if(!key_buf->empty()) {
 103                         // rising edge
 104                         if(nmi_reg & 0x80) {
 105                                 d_cpu->write_signal(SIG_CPU_NMI, 1, 1);
 106                         }
 107                         d_pio->write_signal(SIG_I8255_PORT_C, 0x01, 0x01);
 108                         key_latched = true;
 109                 }
 110 #else
 111                 if(send_count == 0 && !key_buf->empty()) {
 112                         int code = key_buf->read();
 113                         int parity = 1;
 114                         uint64_t bit = 1;
 115
 116                         for(int i = 0; i < 8; i++) {
 117                                 if(code & (1 << i)) {
 118                                         parity++;
 119                                 }
 120                         }
 121                         send_data = 0;
 122
 123                         #define SET_HALF_BIT(v) { \
 124                                 if(v) { \
 125                                         send_data |= bit; \
 126                                 } \
 127                                 bit <<= 1; \
 128                         }
 129                         #define SET_BIT(v) { \
 130                                 if(v) { \
 131                                         SET_HALF_BIT(1); \
 132                                         SET_HALF_BIT(0); \
 133                                 } else { \
 134                                         SET_HALF_BIT(0); \
 135                                         SET_HALF_BIT(1); \
 136                                 } \
 137                         }
 138
 139                         SET_BIT(1);     // start bit
 140                         for(int i = 0; i < 8; i++) {
 141                                 SET_BIT(code & (1 << i));
 142                         }
 143                         SET_BIT(parity & 1);
 144                         send_count = 42;
 145                 }
 146                 if(send_count) {
 147                         if(send_count == 42 && !key_latched) {
 148                                 // rising edge
 149                                 if(nmi_reg & 0x80) {
 150                                         d_cpu->write_signal(SIG_CPU_NMI, 1, 1);
 151                                 }
 152                                 d_pio->write_signal(SIG_I8255_PORT_C, 0x01, 0x01);
 153                                 key_latched = true;
 154                         }
 155                         d_pio->write_signal(SIG_I8255_PORT_C, (send_data & 1) ? 0x40 : 0, 0x40);
 156                         send_data >>= 1;
 157                         send_count--;
 158                 }
 159 #endif
 160 #ifndef TIMER_HACK
 161         } else if(id == EVENT_TIMER) {
 162                 if(!(nmi_reg & 0x20)) {
 163                         d_pit->write_signal(SIG_I8253_CLOCK_1, 1, 1);
 164                         d_pit->write_signal(SIG_I8253_CLOCK_1, 0, 0);
 165                 }
 166 #endif
 167         }
 168 }
 169
 170 void KEYBOARD::write_signal(int id, uint32_t data, uint32_t mask)
 171 {
 172 #ifndef TIMER_HACK
 173         if(id == SIG_KEYBOARD_TIMER) {
 174                 if(nmi_reg & 0x20) {
 175                         d_pit->write_signal(SIG_I8253_CLOCK_1, data, mask);
 176                 }
 177         }
 178 #endif
 179 }
 180
 181 void KEYBOARD::key_down(int code)
 182 {
 183         if(key_table[code]) {
 184                 key_buf->write(key_table[code]);
 185         }
 186 }
 187
 188 void KEYBOARD::key_up(int code)
 189 {
 190         if(key_table[code]) {
 191                 key_buf->write(key_table[code] | 0x80);
 192         }
 193 }
 194