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annotate i2c.c @ 1442:59e1dbb795a7

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Update README in anticipation of 0.5.1 release
author Michael Pavone <pavone@retrodev.com>
date Fri, 25 Aug 2017 20:12:21 -0700
parents d94855080529
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1414
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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) {
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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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129 state->counter = 8;
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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 }