6 static unsigned char rtc_mystery_reg[3];
7 unsigned char ricoh_memory[0x0F];
8 unsigned char ricoh_alarm[0x0F];
10 void put_rtc_byte(uint32_t address_, uint8_t value, uint8_t rtc_type) {
11 uint32_t address = address_ & 0x3F;
13 if (rtc_type == RTC_TYPE_MSM) {
16 rtc_mystery_reg[address - 0x0D] = value & (0x01 | 0x08);
20 rtc_mystery_reg[address - 0x0D] = value;
27 int rtc_bank = (rtc_mystery_reg[0] & 0x03);
28 if ((rtc_bank & 0x02) && address < 0x0D) {
29 if (rtc_bank & 0x01) {
30 // Low nibble of value -> high nibble in RTC memory
31 ricoh_memory[address] &= 0x0F;
32 ricoh_memory[address] |= ((value & 0x0F) << 4);
35 // Low nibble of value -> low nibble in RTC memory
36 ricoh_memory[address] &= 0xF0;
37 ricoh_memory[address] |= (value & 0x0F);
41 else if ((rtc_bank & 0x01) && address < 0x0D) {
42 // RTC alarm stuff, no idea what this is supposed to be for.
48 ricoh_alarm[address] = 0;
52 ricoh_alarm[address] &= (value & (0x08 ^ 0xFF));
57 ricoh_alarm[address] = (value & (0x0C ^ 0xFF));
60 ricoh_alarm[address] = (value & (0x0E ^ 0xFF));
63 ricoh_alarm[address] = value;
66 //printf("Write to Ricoh alarm @%.2X: %.2X -> %.2X\n", address, value, ricoh_alarm[address]);
69 else if (address >= 0x0D) {
70 rtc_mystery_reg[address - 0x0D] = value;
76 uint8_t get_rtc_byte(uint32_t address_, uint8_t rtc_type) {
77 uint32_t address = address_ & 0x3F;
81 struct tm *rtc_time = localtime(&t);
83 if (rtc_type == RTC_TYPE_RICOH) {
84 int rtc_bank = (rtc_mystery_reg[0] & 0x03);
85 if ((rtc_bank & 0x02) && address < 0x0D) {
86 // Get low/high nibble from memory (bank 2/3)
87 return ((ricoh_memory[address] >> (rtc_bank & 0x01) ? 4 : 0) & 0x0F);
89 else if ((rtc_bank & 0x01) && address < 0x0D) {
90 // Get byte from alarm
91 return ricoh_alarm[address];
96 case 0x00: // Seconds low?
97 return rtc_time->tm_sec % 10;
98 case 0x01: // Seconds high?
99 return rtc_time->tm_sec / 10;
100 case 0x02: // Minutes low?
101 return rtc_time->tm_min % 10;
102 case 0x03: // Minutes high?
103 return rtc_time->tm_min / 10;
104 case 0x04: // Hours low?
105 return rtc_time->tm_hour % 10;
106 case 0x05: // Hours high?
107 if (rtc_type == RTC_TYPE_MSM) {
108 if (rtc_mystery_reg[2] & 4) {
109 return (((rtc_time->tm_hour % 12) / 10) | (rtc_time->tm_hour >= 12) ? 0x04 : 0x00);
112 return rtc_time->tm_hour / 10;
115 if (ricoh_alarm[10] & 0x01) {
116 return rtc_time->tm_hour / 10;
119 return (((rtc_time->tm_hour % 12) / 10) | (rtc_time->tm_hour >= 12) ? 0x02 : 0x00);
123 case 0x06: // Day low?
124 if (rtc_type == RTC_TYPE_MSM)
125 return rtc_time->tm_mday % 10;
127 return rtc_time->tm_wday;
128 case 0x07: // Day high?
129 if (rtc_type == RTC_TYPE_MSM)
130 return rtc_time->tm_mday / 10;
132 return rtc_time->tm_mday % 10;
133 case 0x08: // Month low?
134 if (rtc_type == RTC_TYPE_MSM)
135 return (rtc_time->tm_mon + 1) % 10;
137 return rtc_time->tm_mday / 10;
138 case 0x09: // Month high?
139 if (rtc_type == RTC_TYPE_MSM)
140 return (rtc_time->tm_mon + 1) / 10;
142 return (rtc_time->tm_mon + 1) % 10;
143 case 0x0A: // Year low?
144 if (rtc_type == RTC_TYPE_MSM)
145 return rtc_time->tm_year % 10;
147 return (rtc_time->tm_mon + 1) / 10;
148 case 0x0B: // Year high?
149 if (rtc_type == RTC_TYPE_MSM)
150 return rtc_time->tm_year / 10;
152 return rtc_time->tm_year % 10;
153 case 0x0C: // Day of week?
154 if (rtc_type == RTC_TYPE_MSM)
155 return rtc_time->tm_wday;
157 return rtc_time->tm_year / 10;
158 case 0x0D: // Mystery register D-F?
161 if (rtc_type == RTC_TYPE_MSM) {
162 return rtc_mystery_reg[address - 0x0D];
165 if (address == 0x0D) return rtc_mystery_reg[address - 0x0D];