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annotate i2c.c @ 1483:001120e91fed nuklear_ui

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Skip loading menu ROM if Nuklear UI is enabled. Allow disabling Nuklear UI in favor of old menu ROM both at compile time and in config. Fall back to ROM UI if GL is unavailable
author Michael Pavone <pavone@retrodev.com>
date Sat, 25 Nov 2017 20:43:20 -0800
parents d94855080529
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1414
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
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diff changeset
1 #include "genesis.h"
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2 #include "util.h"
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3
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4 enum {
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5 I2C_IDLE,
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6 I2C_START,
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7 I2C_DEVICE_ACK,
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8 I2C_ADDRESS_HI,
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9 I2C_ADDRESS_HI_ACK,
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10 I2C_ADDRESS,
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11 I2C_ADDRESS_ACK,
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12 I2C_READ,
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13 I2C_READ_ACK,
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14 I2C_WRITE,
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15 I2C_WRITE_ACK
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16 };
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17
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18 char * i2c_states[] = {
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19 "idle",
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20 "start",
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21 "device ack",
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22 "address hi",
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23 "address hi ack",
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24 "address",
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25 "address ack",
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26 "read",
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27 "read_ack",
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28 "write",
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29 "write_ack"
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30 };
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31
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32 void eeprom_init(eeprom_state *state, uint8_t *buffer, uint32_t size)
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33 {
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34 state->slave_sda = 1;
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35 state->host_sda = state->scl = 0;
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36 state->buffer = buffer;
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37 state->size = size;
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38 state->state = I2C_IDLE;
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39 }
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40
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41 void set_host_sda(eeprom_state *state, uint8_t val)
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42 {
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43 if (state->scl) {
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44 if (val & ~state->host_sda) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
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45 //low to high, stop condition
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46 state->state = I2C_IDLE;
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47 state->slave_sda = 1;
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48 } else if (~val & state->host_sda) {
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49 //high to low, start condition
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50 state->state = I2C_START;
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51 state->slave_sda = 1;
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52 state->counter = 8;
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53 }
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54 }
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55 state->host_sda = val;
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56 }
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57
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58 void set_scl(eeprom_state *state, uint8_t val)
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59 {
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60 if (val & ~state->scl) {
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61 //low to high transition
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62 switch (state->state)
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63 {
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64 case I2C_START:
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65 case I2C_ADDRESS_HI:
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66 case I2C_ADDRESS:
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67 case I2C_WRITE:
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68 state->latch = state->host_sda | state->latch << 1;
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69 state->counter--;
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70 if (!state->counter) {
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71 switch (state->state & 0x7F)
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72 {
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73 case I2C_START:
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74 state->state = I2C_DEVICE_ACK;
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75 break;
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76 case I2C_ADDRESS_HI:
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77 state->address = state->latch << 8;
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78 state->state = I2C_ADDRESS_HI_ACK;
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79 break;
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80 case I2C_ADDRESS:
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81 state->address |= state->latch;
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82 state->state = I2C_ADDRESS_ACK;
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83 break;
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84 case I2C_WRITE:
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85 state->buffer[state->address] = state->latch;
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86 state->state = I2C_WRITE_ACK;
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87 break;
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88 }
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89 }
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90 break;
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91 case I2C_DEVICE_ACK:
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92 if (state->latch & 1) {
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93 state->state = I2C_READ;
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94 state->counter = 8;
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95 if (state->size < 256) {
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96 state->address = state->latch >> 1;
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97 }
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98 state->latch = state->buffer[state->address];
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99 } else {
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100 if (state->size < 256) {
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101 state->address = state->latch >> 1;
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102 state->state = I2C_WRITE;
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103 } else if (state->size < 4096) {
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104 state->address = (state->latch & 0xE) << 7;
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105 state->state = I2C_ADDRESS;
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106 } else {
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107 state->state = I2C_ADDRESS_HI;
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108 }
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109 state->counter = 8;
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110 }
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111 break;
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112 case I2C_ADDRESS_HI_ACK:
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113 state->state = I2C_ADDRESS;
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114 state->counter = 8;
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115 break;
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116 case I2C_ADDRESS_ACK:
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117 state->state = I2C_WRITE;
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118 state->address &= state->size-1;
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119 state->counter = 8;
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120 break;
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121 case I2C_READ:
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122 state->counter--;
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123 if (!state->counter) {
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124 state->state = I2C_READ_ACK;
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125 }
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126 break;
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127 case I2C_READ_ACK:
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128 state->state = I2C_READ;
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diff changeset
129 state->counter = 8;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
130 state->address++;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
131 //TODO: page mask
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
132 state->address &= state->size-1;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
133 state->latch = state->buffer[state->address];
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
134 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
135 case I2C_WRITE_ACK:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
136 state->state = I2C_WRITE;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
137 state->counter = 8;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
138 state->address++;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
139 //TODO: page mask
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
140 state->address &= state->size-1;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
141 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
142 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
143 } else if (~val & state->scl) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
144 //high to low transition
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
145 switch (state->state & 0x7F)
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
146 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
147 case I2C_DEVICE_ACK:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
148 case I2C_ADDRESS_HI_ACK:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
149 case I2C_ADDRESS_ACK:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
150 case I2C_READ_ACK:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
151 case I2C_WRITE_ACK:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
152 state->slave_sda = 0;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
153 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
154 case I2C_READ:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
155 state->slave_sda = state->latch >> 7;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
156 state->latch = state->latch << 1;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
157 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
158 default:
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
159 state->slave_sda = 1;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
160 break;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
161 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
162 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
163 state->scl = val;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
164 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
165
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
166 uint8_t get_sda(eeprom_state *state)
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
167 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
168 return state->host_sda & state->slave_sda;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
169 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
170
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
171 eeprom_map *find_eeprom_map(uint32_t address, genesis_context *gen)
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
172 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
173 for (int i = 0; i < gen->num_eeprom; i++)
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
174 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
175 if (address >= gen->eeprom_map[i].start && address <= gen->eeprom_map[i].end) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
176 return gen->eeprom_map + i;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
177 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
178 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
179 return NULL;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
180 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
181
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
182 void * write_eeprom_i2c_w(uint32_t address, void * context, uint16_t value)
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
183 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
184 genesis_context *gen = ((m68k_context *)context)->system;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
185 eeprom_map *map = find_eeprom_map(address, gen);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
186 if (!map) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
187 fatal_error("Could not find EEPROM map for address %X\n", address);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
188 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
189 if (map->scl_mask) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
190 set_scl(&gen->eeprom, (value & map->scl_mask) != 0);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
191 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
192 if (map->sda_write_mask) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
193 set_host_sda(&gen->eeprom, (value & map->sda_write_mask) != 0);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
194 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
195 return context;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
196 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
197
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
198 void * write_eeprom_i2c_b(uint32_t address, void * context, uint8_t value)
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
199 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
200 genesis_context *gen = ((m68k_context *)context)->system;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
201 eeprom_map *map = find_eeprom_map(address, gen);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
202 if (!map) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
203 fatal_error("Could not find EEPROM map for address %X\n", address);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
204 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
205
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
206 uint16_t expanded, mask;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
207 if (address & 1) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
208 expanded = value;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
209 mask = 0xFF;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
210 } else {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
211 expanded = value << 8;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
212 mask = 0xFF00;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
213 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
214 if (map->scl_mask & mask) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
215 set_scl(&gen->eeprom, (expanded & map->scl_mask) != 0);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
216 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
217 if (map->sda_write_mask & mask) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
218 set_host_sda(&gen->eeprom, (expanded & map->sda_write_mask) != 0);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
219 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
220 return context;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
221 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
222
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
223 uint16_t read_eeprom_i2c_w(uint32_t address, void * context)
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
224 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
225 genesis_context *gen = ((m68k_context *)context)->system;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
226 eeprom_map *map = find_eeprom_map(address, gen);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
227 if (!map) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
228 fatal_error("Could not find EEPROM map for address %X\n", address);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
229 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
230 uint16_t ret = 0;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
231 if (map->sda_read_bit < 16) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
232 ret = get_sda(&gen->eeprom) << map->sda_read_bit;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
233 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
234 return ret;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
235 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
236
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
237 uint8_t read_eeprom_i2c_b(uint32_t address, void * context)
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
238 {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
239 genesis_context *gen = ((m68k_context *)context)->system;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
240 eeprom_map *map = find_eeprom_map(address, gen);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
241 if (!map) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
242 fatal_error("Could not find EEPROM map for address %X\n", address);
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
243 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
244 uint8_t bit = address & 1 ? map->sda_read_bit : map->sda_read_bit - 8;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
245 uint8_t ret = 0;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
246 if (bit < 8) {
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
247 ret = get_sda(&gen->eeprom) << bit;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
248 }
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
249 return ret;
d94855080529 Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
250 }