Mercurial > repos > blastem
annotate i2c.c @ 1661:c3c3b65f17aa
Updated special thanks
author | Mike Pavone <pavone@retrodev.com> |
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date | Sun, 30 Dec 2018 22:12:34 -0800 |
parents | d94855080529 |
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rev | line source |
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1414
d94855080529
Move I2C EEPROM and NOR Flash functions out of romdb.c into new files
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parents:
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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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130 state->address++; |
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131 //TODO: page mask |
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132 state->address &= state->size-1; |
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133 state->latch = state->buffer[state->address]; |
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134 break; |
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135 case I2C_WRITE_ACK: |
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136 state->state = I2C_WRITE; |
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137 state->counter = 8; |
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138 state->address++; |
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139 //TODO: page mask |
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140 state->address &= state->size-1; |
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141 break; |
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142 } |
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143 } else if (~val & state->scl) { |
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144 //high to low transition |
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145 switch (state->state & 0x7F) |
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146 { |
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147 case I2C_DEVICE_ACK: |
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148 case I2C_ADDRESS_HI_ACK: |
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149 case I2C_ADDRESS_ACK: |
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150 case I2C_READ_ACK: |
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151 case I2C_WRITE_ACK: |
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152 state->slave_sda = 0; |
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153 break; |
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154 case I2C_READ: |
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155 state->slave_sda = state->latch >> 7; |
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156 state->latch = state->latch << 1; |
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157 break; |
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158 default: |
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159 state->slave_sda = 1; |
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160 break; |
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161 } |
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162 } |
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163 state->scl = val; |
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164 } |
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165 |
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166 uint8_t get_sda(eeprom_state *state) |
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167 { |
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168 return state->host_sda & state->slave_sda; |
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169 } |
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170 |
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171 eeprom_map *find_eeprom_map(uint32_t address, genesis_context *gen) |
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172 { |
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173 for (int i = 0; i < gen->num_eeprom; i++) |
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174 { |
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175 if (address >= gen->eeprom_map[i].start && address <= gen->eeprom_map[i].end) { |
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176 return gen->eeprom_map + i; |
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177 } |
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178 } |
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179 return NULL; |
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180 } |
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181 |
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182 void * write_eeprom_i2c_w(uint32_t address, void * context, uint16_t value) |
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183 { |
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184 genesis_context *gen = ((m68k_context *)context)->system; |
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185 eeprom_map *map = find_eeprom_map(address, gen); |
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186 if (!map) { |
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187 fatal_error("Could not find EEPROM map for address %X\n", address); |
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188 } |
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189 if (map->scl_mask) { |
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190 set_scl(&gen->eeprom, (value & map->scl_mask) != 0); |
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191 } |
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|
192 if (map->sda_write_mask) { |
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193 set_host_sda(&gen->eeprom, (value & map->sda_write_mask) != 0); |
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194 } |
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195 return context; |
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|
196 } |
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197 |
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198 void * write_eeprom_i2c_b(uint32_t address, void * context, uint8_t value) |
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199 { |
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200 genesis_context *gen = ((m68k_context *)context)->system; |
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201 eeprom_map *map = find_eeprom_map(address, gen); |
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202 if (!map) { |
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203 fatal_error("Could not find EEPROM map for address %X\n", address); |
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204 } |
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|
205 |
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|
206 uint16_t expanded, mask; |
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207 if (address & 1) { |
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208 expanded = value; |
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209 mask = 0xFF; |
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210 } else { |
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211 expanded = value << 8; |
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212 mask = 0xFF00; |
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|
213 } |
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|
214 if (map->scl_mask & mask) { |
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|
215 set_scl(&gen->eeprom, (expanded & map->scl_mask) != 0); |
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216 } |
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|
217 if (map->sda_write_mask & mask) { |
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|
218 set_host_sda(&gen->eeprom, (expanded & map->sda_write_mask) != 0); |
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219 } |
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|
220 return context; |
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|
221 } |
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|
222 |
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|
223 uint16_t read_eeprom_i2c_w(uint32_t address, void * context) |
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224 { |
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|
225 genesis_context *gen = ((m68k_context *)context)->system; |
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226 eeprom_map *map = find_eeprom_map(address, gen); |
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227 if (!map) { |
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228 fatal_error("Could not find EEPROM map for address %X\n", address); |
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229 } |
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parents:
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230 uint16_t ret = 0; |
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231 if (map->sda_read_bit < 16) { |
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232 ret = get_sda(&gen->eeprom) << map->sda_read_bit; |
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233 } |
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234 return ret; |
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235 } |
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236 |
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237 uint8_t read_eeprom_i2c_b(uint32_t address, void * context) |
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238 { |
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239 genesis_context *gen = ((m68k_context *)context)->system; |
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240 eeprom_map *map = find_eeprom_map(address, gen); |
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241 if (!map) { |
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242 fatal_error("Could not find EEPROM map for address %X\n", address); |
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243 } |
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244 uint8_t bit = address & 1 ? map->sda_read_bit : map->sda_read_bit - 8; |
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245 uint8_t ret = 0; |
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246 if (bit < 8) { |
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247 ret = get_sda(&gen->eeprom) << bit; |
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248 } |
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249 return ret; |
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250 } |