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annotate megawifi.c @ 1513:8f3b6a64b658

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Initial work on MegaWiFi support
author Michael Pavone <pavone@retrodev.com>
date Mon, 15 Jan 2018 09:04:43 -0800
parents
children 4f94e0f90c83
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1513
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1 #include <stdlib.h>
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2 #include <stdint.h>
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3 #include <string.h>
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4 #include "genesis.h"
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5
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6 enum {
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7 TX_IDLE,
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8 TX_LEN1,
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9 TX_LEN2,
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10 TX_PAYLOAD,
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11 TX_WAIT_ETX
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12 };
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13 #define STX 0x7E
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14 #define ETX 0x7E
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15
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16 #define E(N) N
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17 enum {
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18 #include "mw_commands.c"
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19 CMD_ERROR = 255
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20 };
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21 #undef E
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22 #define E(N) #N
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23 static const char *cmd_names[] = {
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24 #include "mw_commands.c"
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25 [255] = "CMD_ERROR"
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26 };
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27
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28 enum {
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29 STATE_IDLE=1,
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30 STATE_AP_JOIN,
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31 STATE_SCAN,
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32 STATE_READY,
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33 STATE_TRANSPARENT
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34 };
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35
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36 #define FLAG_ONLINE
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37
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38 typedef struct {
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39 uint32_t transmit_bytes;
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40 uint32_t expected_bytes;
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41 uint32_t receive_bytes;
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42 uint32_t receive_read;
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43 uint16_t channel_flags;
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44 uint8_t scratchpad;
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45 uint8_t transmit_channel;
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46 uint8_t transmit_state;
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47 uint8_t module_state;
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48 uint8_t flags;
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49 uint8_t transmit_buffer[4096];
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50 uint8_t receive_buffer[4096];
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51 } megawifi;
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52
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53 static megawifi *get_megawifi(void *context)
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54 {
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55 m68k_context *m68k = context;
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56 genesis_context *gen = m68k->system;
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57 if (!gen->extra) {
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58 gen->extra = calloc(1, sizeof(megawifi));
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59 ((megawifi *)gen->extra)->module_state = STATE_IDLE;
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60 }
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61 return gen->extra;
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62 }
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63
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64 static void mw_putc(megawifi *mw, uint8_t v)
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65 {
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66 if (mw->receive_bytes == sizeof(mw->receive_buffer)) {
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67 return;
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68 }
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69 mw->receive_buffer[mw->receive_bytes++] = v;
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70 }
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71
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72 static void mw_puts(megawifi *mw, char *s)
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73 {
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74 uint32_t len = strlen(s);
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75 if ((mw->receive_bytes + len) > sizeof(mw->receive_buffer)) {
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76 return;
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77 }
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78 memcpy(mw->receive_buffer + mw->receive_bytes, s, len);
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79 mw->receive_bytes += len;
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80 }
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81
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82 static void process_packet(megawifi *mw)
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83 {
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84 if (mw->transmit_channel == 0) {
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85 uint32_t command = mw->transmit_buffer[0] << 8 | mw->transmit_buffer[1];
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86 uint32_t size = mw->transmit_buffer[2] << 8 | mw->transmit_buffer[3];
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87 if (size > mw->transmit_bytes - 4) {
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88 size = mw->transmit_bytes - 4;
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89 }
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90 mw->receive_read = mw->receive_bytes = 0;
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91 switch (command)
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92 {
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93 case CMD_VERSION:
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94 //LSD header
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95 mw_putc(mw, 0x7E);
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96 mw_putc(mw, 0);
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97 mw->receive_bytes += 1; //reserve space for LSB of len
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98 //cmd
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99 mw_putc(mw, 0);
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100 mw_putc(mw, CMD_OK);
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101 //length
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102 mw_putc(mw, 0);
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103 mw->receive_bytes += 1; //reserve space for LSB of len
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104 mw_putc(mw, 1);
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105 mw_putc(mw, 0);
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106 mw_puts(mw, "blastem");
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107 mw->receive_buffer[2] = mw->receive_bytes - 3;
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108 mw->receive_buffer[6] = mw->receive_bytes - 7;
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109 mw_putc(mw, 0x7E);
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110 break;
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111 case CMD_ECHO:
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112 mw->receive_bytes = mw->transmit_bytes;
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113 memcpy(mw->receive_buffer, mw->transmit_buffer, mw->transmit_bytes);
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114 break;
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115 case CMD_AP_JOIN:
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116 mw->module_state = STATE_READY;
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117 mw_putc(mw, 0x7E);
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118 mw_putc(mw, 0);
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119 mw_putc(mw, 4);
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120 //cmd
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121 mw_putc(mw, 0);
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122 mw_putc(mw, CMD_OK);
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123 //length
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124 mw_putc(mw, 0);
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125 mw_putc(mw, 0);
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126 mw_putc(mw, 0x7E);
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127 break;
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128 case CMD_SYS_STAT:
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129 //LSD header
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130 mw_putc(mw, 0x7E);
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131 mw_putc(mw, 0);
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132 mw_putc(mw, 8);
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133 //cmd
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134 mw_putc(mw, 0);
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135 mw_putc(mw, CMD_OK);
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136 //length
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137 mw_putc(mw, 0);
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138 mw_putc(mw, 4);
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139 mw_putc(mw, mw->module_state);
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140 mw_putc(mw, mw->flags);
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141 mw_putc(mw, mw->channel_flags >> 8);
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142 mw_putc(mw, mw->channel_flags);
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143 mw_putc(mw, 0x7E);
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144 break;
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145 default:
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146 printf("Unhandled MegaWiFi command %s(%d) with length %X\n", cmd_names[command], command, size);
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147 break;
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148 }
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149 } else {
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150 printf("Unhandled receive of MegaWiFi data on channel %d\n", mw->transmit_channel);
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diff changeset
151 }
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diff changeset
152 mw->transmit_bytes = mw->expected_bytes = 0;
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153 }
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diff changeset
154
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155 void *megawifi_write_b(uint32_t address, void *context, uint8_t value)
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diff changeset
156 {
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diff changeset
157 if (!(address & 1)) {
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158 return context;
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159 }
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160 megawifi *mw = get_megawifi(context);
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161 address = address >> 1 & 7;
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162 switch (address)
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163 {
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164 case 0:
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165 switch (mw->transmit_state)
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166 {
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167 case TX_IDLE:
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168 if (value == STX) {
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169 mw->transmit_state = TX_LEN1;
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170 }
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171 break;
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172 case TX_LEN1:
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173 mw->transmit_channel = value >> 4;
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174 mw->expected_bytes = value << 8 & 0xF00;
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175 mw->transmit_state = TX_LEN2;
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176 break;
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177 case TX_LEN2:
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178 mw->expected_bytes |= value;
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179 mw->transmit_state = TX_PAYLOAD;
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180 break;
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181 case TX_PAYLOAD:
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182 mw->transmit_buffer[mw->transmit_bytes++] = value;
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183 if (mw->transmit_bytes == mw->expected_bytes) {
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diff changeset
184 mw->transmit_state = TX_WAIT_ETX;
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diff changeset
185 }
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diff changeset
186 break;
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diff changeset
187 case TX_WAIT_ETX:
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188 if (value == ETX) {
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diff changeset
189 mw->transmit_state = TX_IDLE;
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diff changeset
190 process_packet(mw);
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parents:
diff changeset
191 }
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diff changeset
192 break;
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parents:
diff changeset
193 }
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diff changeset
194 break;
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parents:
diff changeset
195 case 7:
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diff changeset
196 mw->scratchpad = value;
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diff changeset
197 break;
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diff changeset
198 default:
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199 printf("Unhandled write to MegaWiFi UART register %X: %X\n", address, value);
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200 }
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diff changeset
201 return context;
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diff changeset
202 }
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parents:
diff changeset
203
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diff changeset
204 void *megawifi_write_w(uint32_t address, void *context, uint16_t value)
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parents:
diff changeset
205 {
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diff changeset
206 return megawifi_write_b(address | 1, context, value);
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diff changeset
207 }
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diff changeset
208
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diff changeset
209 uint8_t megawifi_read_b(uint32_t address, void *context)
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parents:
diff changeset
210 {
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parents:
diff changeset
211
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parents:
diff changeset
212 if (!(address & 1)) {
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parents:
diff changeset
213 return 0xFF;
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parents:
diff changeset
214 }
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parents:
diff changeset
215 megawifi *mw = get_megawifi(context);
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parents:
diff changeset
216 address = address >> 1 & 7;
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parents:
diff changeset
217 switch (address)
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parents:
diff changeset
218 {
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parents:
diff changeset
219 case 0:
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parents:
diff changeset
220 if (mw->receive_read < mw->receive_bytes) {
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
221 return mw->receive_buffer[mw->receive_read++];
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parents:
diff changeset
222 }
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parents:
diff changeset
223 return 0xFF;
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
224 case 5:
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parents:
diff changeset
225 //line status
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parents:
diff changeset
226 return 0x60 | (mw->receive_read < mw->receive_bytes);
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
227 case 7:
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parents:
diff changeset
228 return mw->scratchpad;
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parents:
diff changeset
229 default:
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parents:
diff changeset
230 printf("Unhandled read from MegaWiFi UART register %X\n", address);
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parents:
diff changeset
231 return 0xFF;
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parents:
diff changeset
232 }
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parents:
diff changeset
233 }
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
234
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parents:
diff changeset
235 uint16_t megawifi_read_w(uint32_t address, void *context)
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parents:
diff changeset
236 {
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parents:
diff changeset
237 return 0xFF00 | megawifi_read_b(address | 1, context);
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
238 }