source/src/vm/msm58321.cpp

   1 /*
   2         Skelton for retropc emulator
   3
   4         Author : Takeda.Toshiya
   5         Date   : 2008.05.02-
   6
   7         [ MSM58321/MSM5832 ]
   8 */
   9
  10 #include "vm.h"
  11 #include "../emu.h"
  12 #include "msm58321.h"
  13
  14 #define EVENT_BUSY      0
  15 #define EVENT_INC       1
  16 #define EVENT_PULSE     2
  17
  18 #if defined(Q_OS_WIN)
  19 DLL_PREFIX_I struct cur_time_s cur_time;
  20 #endif
  21
  22 MSM58321::MSM58321(VM_TEMPLATE* parent_vm, EMU* parent_emu) : MSM58321_BASE(parent_vm, parent_emu)
  23 {
  24                 initialize_output_signals(&outputs_busy);
  25                 set_device_name(_T("MSM58321 RTC"));
  26 }
  27
  28 void MSM58321::initialize()
  29 {
  30         DEVICE::initialize();
  31         // init rtc
  32         memset(regs, 0, sizeof(regs));
  33         regs[5] = 8; // 24h
  34         regs[15] = 0x0f;
  35         wreg = regnum = 0;
  36         cs = true;
  37         rd = wr = addr_wr = busy = hold = false;
  38         count_1024hz = count_1s = count_1m = count_1h = 0;
  39
  40         get_host_time(&cur_time);
  41         read_from_cur_time();
  42
  43         // register events
  44 #ifdef MSM58321_START_DAY
  45         start_day = MSM58321_START_DAY;
  46 #endif
  47 #ifdef MSM58321_START_YEAR
  48         start_year = MSM58321_START_YEAR;
  49 #endif
  50         register_event(this, EVENT_BUSY, 1000000.0, true, &register_id);
  51         register_event(this, EVENT_PULSE, 1000000.0 / 8192.0, true, NULL);      // 122.1 usec
  52 }
  53
  54
  55 void MSM58321::read_from_cur_time()
  56 {
  57         // update clock
  58         int hour = (regs[5] & 8) ? cur_time.hour : (cur_time.hour % 12);
  59         int ampm = (cur_time.hour > 11) ? 4 : 0;
  60
  61         regs[ 0] = TO_BCD_LO(cur_time.second);
  62         regs[ 1] = TO_BCD_HI(cur_time.second);
  63         regs[ 2] = TO_BCD_LO(cur_time.minute);
  64         regs[ 3] = TO_BCD_HI(cur_time.minute);
  65         regs[ 4] = TO_BCD_LO(hour);
  66         regs[ 5] = TO_BCD_HI(hour) | ampm | (regs[5] & 8);
  67         regs[ 6] = cur_time.day_of_week;
  68         regs[ 7] = TO_BCD_LO(cur_time.day - start_day);
  69         regs[ 8] = TO_BCD_HI(cur_time.day - start_day) | (regs[8] & 0x0c);
  70         regs[ 9] = TO_BCD_LO(cur_time.month);
  71         regs[10] = TO_BCD_HI(cur_time.month);
  72         regs[11] = TO_BCD_LO(cur_time.year - start_year);
  73         regs[12] = TO_BCD_HI(cur_time.year - start_year);
  74 }
  75
  76 void MSM58321::write_to_cur_time()
  77 {
  78         cur_time.second = regs[0] + (regs[1] & 7) * 10;
  79         cur_time.minute = regs[2] + (regs[3] & 7) * 10;
  80         cur_time.hour = regs[4] + (regs[5] & 3) * 10;
  81         if(!(regs[5] & 8)) {
  82                 cur_time.hour %= 12;
  83                 if(regs[5] & 4) {
  84                         cur_time.hour += 12;
  85                 }
  86         }
  87 //      cur_time.day_of_week = regs[6] & 7;
  88         cur_time.day = regs[7] + (regs[8] & 3) * 10;
  89         cur_time.day += start_day;
  90         cur_time.month = regs[9] + (regs[10] & 1) * 10;
  91         cur_time.year = regs[11] + regs[12] * 10;
  92         cur_time.year += start_year;
  93         cur_time.update_year();
  94         cur_time.update_day_of_week();
  95
  96         // restart event
  97         cancel_event(this, register_id);
  98         register_event(this, EVENT_BUSY, 1000000.0, true, &register_id);
  99 }
 100
 101 void MSM58321::set_busy(bool val)
 102 {
 103         if(busy != val) {
 104                 write_signals(&outputs_busy, busy ? 0 : 0xffffffff);    // negative
 105         }
 106         busy = val;
 107 }