Mercurial > repos > simple16
annotate controller.s16 @ 39:52d601e13ea4
WIP documentation
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Wed, 06 Apr 2016 12:15:25 -0700 |
| parents | 44c057a640b2 |
| children |
| rev | line source |
|---|---|
| 32 | 1 ldim vectors, r0 |
| 2 ldimh vectors, r0 | |
| 3 setvbr r0 | |
| 4 ;load palette | |
| 5 ldim 0, r0 | |
| 6 ldimh $FF,r0 | |
| 7 outi $E, r0 | |
| 8 ldim colors, r1 | |
| 9 ldimh colors, r1 | |
| 10 | |
| 11 ;copy 3 colors for 1st palette | |
| 12 ldim 0, r2 | |
| 13 ldim 3, r3 | |
| 14 ldim copy_data, r12 | |
| 15 ldimh copy_data, r12 | |
| 16 call r12, r13 | |
| 17 | |
| 18 ;setup writes to 2nd palette | |
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19 ldim $20, r0 |
| 32 | 20 ldimh $FF,r0 |
| 21 outi $E, r0 | |
| 22 | |
| 23 ;copy 3 colors for 2nd palette | |
| 24 ldim 3, r3 | |
| 25 call r12, r13 | |
| 26 | |
|
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27 |
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28 ;zero out name table |
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29 ldim $00, r0 |
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30 ldim $60, r0 |
| 32 | 31 outi $E, r0 |
| 32 | |
| 33 ldim write_zeros, r11 | |
| 34 ldimh write_zeros, r11 | |
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35 ldim 0, r3 |
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36 ldimh $20, r3 |
| 32 | 37 call r11, r13 |
| 38 | |
| 39 ;setup writes to tile data area | |
| 40 ldim 0, r0 | |
| 41 outi $E, r0 | |
| 42 | |
| 43 ;zero out first tile | |
| 44 ldim $10, r3 | |
| 45 call r11, r13 | |
| 46 | |
| 47 ;copy tiles | |
| 48 ldim $C0, r3 | |
| 49 ldimh 0, r3 | |
| 50 call r12, r13 | |
| 51 | |
| 52 | |
| 53 | |
| 54 ;copy tile map to ram | |
| 55 ldim 0, r0 | |
| 56 ldimh $C0, r0 | |
| 57 | |
| 58 ldim map, r1 | |
| 59 ldimh map, r1 | |
| 60 | |
| 61 ldim 0, r2 | |
| 62 ldim 27, r3 | |
| 63 | |
| 64 ldim memcpy16, r10 | |
| 65 ldimh memcpy16, r10 | |
| 66 call r10, r13 | |
| 67 | |
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68 ;make a second copy of tile map for controller #2 |
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69 ldim $36, r0 |
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70 ldimh $C0, r0 |
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71 ldim 0, r2 |
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72 ldim 27, r3 |
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73 call r10, r13 |
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74 |
| 32 | 75 ;enable vertical interrupts |
| 76 ori 2, sr | |
| 77 | |
| 78 ;vscroll reg | |
| 79 ldim 0, r0 | |
| 80 ldimh $C6, r0 | |
| 81 outi $C, r0 | |
| 82 ;hscroll reg + enable display | |
| 83 ldim 0, r0 | |
| 84 ldimh $80, r0 | |
| 85 outi $D, r0 | |
| 86 | |
| 87 forever: | |
| 88 bra forever | |
| 89 | |
| 90 copy_data: | |
| 91 ld16 r1, r2, r4 | |
| 92 outi $F, r4 | |
| 93 | |
| 94 addi 2, r2 | |
| 95 addi -1, r3 | |
| 96 bne copy_data | |
| 97 mov r13, pc | |
| 98 | |
| 99 memcpy16: | |
| 100 ld16 r1, r2, r4 | |
| 101 str16 r0, r2, r4 | |
| 102 | |
| 103 addi 2, r2 | |
| 104 addi -1, r3 | |
| 105 bne memcpy16 | |
| 106 mov r13, pc | |
| 107 | |
| 108 write_zeros: | |
| 109 ldim 0, r4 | |
| 110 zloop: | |
| 111 outi $f, r4 | |
| 112 | |
| 113 addi -1, r3 | |
| 114 bne zloop | |
| 115 mov r13, pc | |
| 116 | |
| 117 | |
| 118 | |
| 119 vectors: | |
| 120 dc.w 0 | |
| 121 dc.w vint_handler | |
| 122 | |
| 123 vint_handler | |
| 124 setuer r13 | |
| 125 ;handler code goes here | |
| 126 | |
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127 ;VRAM address of first element of diagram |
| 32 | 128 ldim $84, r0 |
| 129 ldimh $60, r0 | |
| 130 | |
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131 ;distance between rows |
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132 ldim 128, r5 |
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133 ldimh 0, r5 |
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134 |
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135 ;RAM address of map |
| 32 | 136 ldim 0, r1 |
| 137 ldimh $C0, r1 | |
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138 |
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139 ;index |
| 32 | 140 ldim 0, r2 |
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141 |
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142 ;iteration count |
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143 ldim 3, r6 |
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144 |
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145 ldim copy_rows, r9 |
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146 ldimh copy_rows, r9 |
| 32 | 147 |
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148 call r9, r8 |
| 32 | 149 |
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150 ;VRAM address of first element of 2nd diagram |
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151 ldim $AC, r0 |
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152 ldimh $60, r0 |
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153 ldim 3, r6 |
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154 call r9, r8 |
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155 |
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156 |
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157 |
| 32 | 158 |
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159 ;update map for next frame |
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160 |
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161 ;read controller 1 |
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162 ini $0, r0 |
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163 ;r1 = map |
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164 |
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165 ldim update_map, r10 |
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166 ldimh update_map, r10 |
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167 call r10, r10 |
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168 |
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169 ;read controller 2 |
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170 ini $1, r0 |
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171 ldim $36, r1 |
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172 ldimh $C0, r1 |
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173 |
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174 ldim update_map, r10 |
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175 ldimh update_map, r10 |
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176 call r10, r10 |
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177 |
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178 reti r13 |
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179 |
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180 update_map: |
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181 ldim offsets, r2 |
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182 ldimh offsets, r2 |
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183 ;index |
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184 ldim 0, r3 |
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185 ;mask to test bits |
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186 ldim 1, r4 |
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187 ;constant $2000 |
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188 ldim 0, r9 |
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189 ldimh $20, r9 |
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190 ;limit |
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191 ldim 12, r5 |
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192 modify_loop |
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193 ;load offset |
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194 ld8 r2, r3, r6 |
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195 ;load existing value |
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196 ld16 r1, r6, r7 |
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197 ;test for button pressed |
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198 and r0, r4, r8 |
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199 beq not_pressed |
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200 or r9, r7, r7 |
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201 bra store_modified |
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202 not_pressed |
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203 not r9, r9 |
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204 and r9, r7, r7 |
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205 not r9, r9 |
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206 store_modified |
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207 str16 r1, r6, r7 |
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208 ;shift mask to the left |
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209 add r4, r4, r4 |
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210 addi 1, r3 |
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211 cmp r3, r5 |
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212 bne modify_loop |
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213 |
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214 mov r10, pc |
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215 |
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216 copy_rows |
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217 outi $E, r0 |
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218 |
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219 ;copy row of updated tile map |
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220 ldim 9, r3 |
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221 call r12, r13 |
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222 |
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223 add r5, r0, r0 |
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224 addi -1, r6 |
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44c057a640b2
Display state of both controllers in controller test ROM
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diff
changeset
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225 bne copy_rows |
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44c057a640b2
Display state of both controllers in controller test ROM
Michael Pavone <pavone@retrodev.com>
parents:
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diff
changeset
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226 mov r8, pc |
| 32 | 227 |
| 228 offsets: | |
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34
4a093f15fb1b
Finish controller test for controller 1
Michael Pavone <pavone@retrodev.com>
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229 dc.b 34 ;Z |
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Michael Pavone <pavone@retrodev.com>
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230 dc.b 32 ;Y |
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Michael Pavone <pavone@retrodev.com>
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231 dc.b 30 ;X |
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Michael Pavone <pavone@retrodev.com>
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232 dc.b 52 ;C |
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233 dc.b 50 ;B |
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234 dc.b 48 ;A |
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235 dc.b 44 ;Mode |
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236 dc.b 26 ;Start |
| 32 | 237 |
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34
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238 dc.b 22 ;Right |
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Michael Pavone <pavone@retrodev.com>
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239 dc.b 18 ;Left |
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Finish controller test for controller 1
Michael Pavone <pavone@retrodev.com>
parents:
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240 dc.b 38 ;Down |
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parents:
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241 dc.b 2 ;Up |
| 32 | 242 |
| 243 colors: | |
| 244 dc.w $000 | |
| 245 dc.w $777 | |
| 246 dc.w $333 | |
| 247 ;second palette | |
| 248 dc.w $000 | |
| 249 dc.w $FFF | |
| 250 dc.w $00F | |
|
35
5a5e02d1acf1
No need to initialize name table with starting values other than zero as we copy the relevant parts during VBlank anyway
Michael Pavone <pavone@retrodev.com>
parents:
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changeset
|
251 tiles: |
|
5a5e02d1acf1
No need to initialize name table with starting values other than zero as we copy the relevant parts during VBlank anyway
Michael Pavone <pavone@retrodev.com>
parents:
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changeset
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252 incbin buttons.tiles |
| 32 | 253 map: |
| 254 dc.w 0, 1, 0, 0, 0, 0, 0, 0, 0 | |
| 255 dc.w 3, 0, 4, 0, 5, 0, 7, 8, 9 | |
| 256 dc.w 0, 2, 0, 0, 6, 0, 10, 11, 12 | |
| 257 |