Mercurial > vba-linux

     1 #include <cstring>

     2 

     3 #include "../Port.h"

     4 #include "../NLS.h"

     5 #include "../common/System.h" // systemMessage

     6 #include "../common/Util.h"

     7 #include "../common/movie.h"

     8 #include "GBAGlobals.h"

     9 

    10 enum RTCSTATE { IDLE, COMMAND, DATA, READDATA };

    11 

    12 typedef struct

    13 {

    14 	u8       byte0;

    15 	u8       byte1;

    16 	u8       byte2;

    17 	u8       command;

    18 	int      dataLen;

    19 	int      bits;

    20 	RTCSTATE state;

    21 	u8       data[12];

    22 	// reserved variables for future

    23 	u8   reserved[12];

    24 	bool reserved2;

    25 	u32  reserved3;

    26 } RTCCLOCKDATA;

    27 

    28 static RTCCLOCKDATA rtcClockData;

    29 static bool         rtcEnabled = false;

    30 

    31 void rtcEnable(bool enable)

    32 {

    33 	rtcEnabled = enable;

    34 }

    35 

    36 bool rtcIsEnabled()

    37 {

    38 	return rtcEnabled;

    39 }

    40 

    41 u16 rtcRead(u32 address)

    42 {

    43 	if (rtcEnabled)

    44 	{

    45 		if (address == 0x80000c8)

    46 			return rtcClockData.byte2;

    47 		else if (address == 0x80000c6)

    48 			return rtcClockData.byte1;

    49 		else if (address == 0x80000c4)

    50 		{

    51 			return rtcClockData.byte0;

    52 		}

    53 	}

    54 

    55 	return READ16LE((&rom[address & 0x1FFFFFE]));

    56 }

    57 

    58 static u8 toBCD(u8 value)

    59 {

    60 	value = value % 100;

    61 	int l = value % 10;

    62 	int h = value / 10;

    63 	return h * 16 + l;

    64 }

    65 

    66 bool rtcWrite(u32 address, u16 value)

    67 {

    68 	if (!rtcEnabled)

    69 		return false;

    70 

    71 	if (address == 0x80000c8)

    72 	{

    73 		rtcClockData.byte2 = (u8)value; // enable ?

    74 	}

    75 	else if (address == 0x80000c6)

    76 	{

    77 		rtcClockData.byte1 = (u8)value; // read/write

    78 	}

    79 	else if (address == 0x80000c4)

    80 	{

    81 		if (rtcClockData.byte2 & 1)

    82 		{

    83 			if (rtcClockData.state == IDLE && rtcClockData.byte0 == 1 && value == 5)

    84 			{

    85 				rtcClockData.state   = COMMAND;

    86 				rtcClockData.bits    = 0;

    87 				rtcClockData.command = 0;

    88 			}

    89 			else if (!(rtcClockData.byte0 & 1) && (value & 1)) // bit transfer

    90 			{

    91 				rtcClockData.byte0 = (u8)value;

    92 				switch (rtcClockData.state)

    93 				{

    94 				case COMMAND:

    95 					rtcClockData.command |= ((value & 2) >> 1) << (7-rtcClockData.bits);

    96 					rtcClockData.bits++;

    97 					if (rtcClockData.bits == 8)

    98 					{

    99 						rtcClockData.bits = 0;

   100 						switch (rtcClockData.command)

   101 						{

   102 						case 0x60:

   103 							// not sure what this command does but it doesn't take parameters

   104 							// maybe it is a reset or stop

   105 							rtcClockData.state = IDLE;

   106 							rtcClockData.bits  = 0;

   107 							break;

   108 						case 0x62:

   109 							// this sets the control state but not sure what those values are

   110 							rtcClockData.state   = READDATA;

   111 							rtcClockData.dataLen = 1;

   112 							break;

   113 						case 0x63:

   114 							rtcClockData.dataLen = 1;

   115 							rtcClockData.data[0] = 0x40;

   116 							rtcClockData.state   = DATA;

   117 							break;

   118 						case 0x65:

   119 						{

   120 							struct tm *newtime;

   121 							time_t     long_time;

   122 

   123 							if (VBAMovieActive() || VBAMovieLoading())

   124 							{

   125 								long_time = VBAMovieGetId() + VBAMovieGetFrameCounter()/60;

   126 								newtime   = gmtime(&long_time);

   127 							}

   128 							else

   129 							{

   130 								time(&long_time);      /* Get time as long integer. */

   131 								newtime = localtime(&long_time); /* Convert to local time. */

   132 							}

   133 

   134 							rtcClockData.dataLen = 7;

   135 							rtcClockData.data[0] = toBCD(newtime->tm_year);

   136 							rtcClockData.data[1] = toBCD(newtime->tm_mon+1);

   137 							rtcClockData.data[2] = toBCD(newtime->tm_mday);

   138 							rtcClockData.data[3] = 0;

   139 							rtcClockData.data[4] = toBCD(newtime->tm_hour);

   140 							rtcClockData.data[5] = toBCD(newtime->tm_min);

   141 							rtcClockData.data[6] = toBCD(newtime->tm_sec);

   142 							rtcClockData.state   = DATA;

   143 							break;

   144 						}

   145 						case 0x67:

   146 						{

   147 							struct tm *newtime;

   148 							time_t     long_time;

   149 

   150 							if (VBAMovieActive() || VBAMovieLoading())

   151 							{

   152 								long_time = VBAMovieGetId() + VBAMovieGetFrameCounter()/60;

   153 								newtime   = gmtime(&long_time);

   154 							}

   155 							else

   156 							{

   157 								time(&long_time);      /* Get time as long integer. */

   158 								newtime = localtime(&long_time); /* Convert to local time. */

   159 							}

   160 

   161 							rtcClockData.dataLen = 3;

   162 							rtcClockData.data[0] = toBCD(newtime->tm_hour);

   163 							rtcClockData.data[1] = toBCD(newtime->tm_min);

   164 							rtcClockData.data[2] = toBCD(newtime->tm_sec);

   165 							rtcClockData.state   = DATA;

   166 							break;

   167 						}

   168 						default:

   169 							systemMessage(0, N_("Unknown RTC command %02x"), rtcClockData.command);

   170 							rtcClockData.state = IDLE;

   171 							break;

   172 						}

   173 					}

   174 					break;

   175 				case DATA:

   176 					if (rtcClockData.byte1 & 2)

   177 					{}

   178 					else

   179 					{

   180 						rtcClockData.byte0 = (rtcClockData.byte0 & ~2) |

   181 						                     ((rtcClockData.data[rtcClockData.bits >> 3] >>

   182 						                       (rtcClockData.bits & 7)) & 1)*2;

   183 						rtcClockData.bits++;

   184 						if (rtcClockData.bits == 8*rtcClockData.dataLen)

   185 						{

   186 							rtcClockData.bits  = 0;

   187 							rtcClockData.state = IDLE;

   188 						}

   189 					}

   190 					break;

   191 				case READDATA:

   192 					if (!(rtcClockData.byte1 & 2))

   193 					{}

   194 					else

   195 					{

   196 						rtcClockData.data[rtcClockData.bits >> 3] =

   197 						    (rtcClockData.data[rtcClockData.bits >> 3] >> 1) |

   198 						    ((value << 6) & 128);

   199 						rtcClockData.bits++;

   200 						if (rtcClockData.bits == 8*rtcClockData.dataLen)

   201 						{

   202 							rtcClockData.bits  = 0;

   203 							rtcClockData.state = IDLE;

   204 						}

   205 					}

   206 					break;

   207 				default:

   208 					break;

   209 				}

   210 			}

   211 			else

   212 				rtcClockData.byte0 = (u8)value;

   213 		}

   214 	}

   215 	return true;

   216 }

   217 

   218 void rtcReset()

   219 {

   220 	memset(&rtcClockData, 0, sizeof(rtcClockData));

   221 

   222 	rtcClockData.byte0   = 0;

   223 	rtcClockData.byte1   = 0;

   224 	rtcClockData.byte2   = 0;

   225 	rtcClockData.command = 0;

   226 	rtcClockData.dataLen = 0;

   227 	rtcClockData.bits    = 0;

   228 	rtcClockData.state   = IDLE;

   229 }

   230 

   231 void rtcSaveGame(gzFile gzFile)

   232 {

   233 	utilGzWrite(gzFile, &rtcClockData, sizeof(rtcClockData));

   234 }

   235 

   236 void rtcReadGame(gzFile gzFile)

   237 {

   238 	utilGzRead(gzFile, &rtcClockData, sizeof(rtcClockData));

   239 }

   240
author	Robert McIntyre <rlm@mit.edu>
date	Sun, 04 Mar 2012 20:32:31 -0600
parents	f9f4f1b99eed
children