trunk/src/mess/video/hd44780.c
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| 3 | 3 | Hitachi HD44780 LCD controller |
| 4 | 4 | |
| 5 | 5 | TODO: |
| 6 | | - 4-bit mode |
| 7 | 6 | - 5x10 chars |
| 8 | 7 | - dump internal CGROM |
| 9 | 8 | |
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| 87 | 86 | save_item( NAME(m_blink)); |
| 88 | 87 | save_item( NAME(m_ddram)); |
| 89 | 88 | save_item( NAME(m_cgram)); |
| 90 | | |
| 89 | save_item( NAME(m_nibble)); |
| 90 | save_item( NAME(m_data_latch)); |
| 91 | 91 | } |
| 92 | 92 | |
| 93 | 93 | |
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| 115 | 115 | m_char_size = 0; |
| 116 | 116 | m_disp_shift = 0; |
| 117 | 117 | m_blink = 0; |
| 118 | m_nibble = false; |
| 119 | m_data_latch = 0; |
| 118 | 120 | |
| 119 | 121 | set_busy_flag(1520); |
| 120 | 122 | } |
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| 223 | 225 | |
| 224 | 226 | WRITE8_MEMBER(hd44780_device::control_write) |
| 225 | 227 | { |
| 226 | | if (BIT(data, 7)) // Set DDRAM Address |
| 228 | if (m_data_len == 0) |
| 227 | 229 | { |
| 230 | m_nibble = !m_nibble; |
| 231 | |
| 232 | if (m_nibble) |
| 233 | { |
| 234 | m_data_latch = data & 0xf0; |
| 235 | return; |
| 236 | } |
| 237 | else |
| 238 | { |
| 239 | m_data_latch |= ((data>>4) & 0x0f); |
| 240 | } |
| 241 | } |
| 242 | else |
| 243 | { |
| 244 | m_data_latch = data; |
| 245 | } |
| 246 | |
| 247 | if (BIT(m_data_latch, 7)) // Set DDRAM Address |
| 248 | { |
| 228 | 249 | m_ac_mode = 0; |
| 229 | | m_ac = data & 0x7f; |
| 250 | m_ac = m_data_latch & 0x7f; |
| 230 | 251 | m_cursor_pos = m_ac; |
| 231 | 252 | set_busy_flag(37); |
| 232 | 253 | } |
| 233 | | else if (BIT(data, 6)) // Set CGRAM Address |
| 254 | else if (BIT(m_data_latch, 6)) // Set CGRAM Address |
| 234 | 255 | { |
| 235 | 256 | m_ac_mode = 1; |
| 236 | | m_ac = data & 0x3f; |
| 257 | m_ac = m_data_latch & 0x3f; |
| 237 | 258 | set_busy_flag(37); |
| 238 | 259 | } |
| 239 | | else if (BIT(data, 5)) // Function Set |
| 260 | else if (BIT(m_data_latch, 5)) // Function Set |
| 240 | 261 | { |
| 241 | 262 | // datasheet says you can't change char size after first function set without altering 4/8 bit mode |
| 242 | | if (BIT(data, 4) != m_data_len) |
| 243 | | m_char_size = BIT(data, 2); |
| 263 | if (BIT(m_data_latch, 4) != m_data_len) |
| 264 | m_char_size = BIT(m_data_latch, 2); |
| 244 | 265 | |
| 245 | | m_data_len = BIT(data, 4); |
| 246 | | m_num_line = BIT(data, 3); |
| 266 | m_data_len = BIT(m_data_latch, 4); |
| 267 | m_num_line = BIT(m_data_latch, 3); |
| 247 | 268 | set_busy_flag(37); |
| 248 | 269 | } |
| 249 | | else if (BIT(data, 4)) // Cursor or display shift |
| 270 | else if (BIT(m_data_latch, 4)) // Cursor or display shift |
| 250 | 271 | { |
| 251 | | UINT8 direct = (BIT(data, 2)) ? +1 : -1; |
| 272 | UINT8 direct = (BIT(m_data_latch, 2)) ? +1 : -1; |
| 252 | 273 | |
| 253 | | if (BIT(data, 3)) |
| 274 | if (BIT(m_data_latch, 3)) |
| 254 | 275 | m_disp_shift += direct; |
| 255 | 276 | else |
| 256 | 277 | { |
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| 260 | 281 | |
| 261 | 282 | set_busy_flag(37); |
| 262 | 283 | } |
| 263 | | else if (BIT(data, 3)) // Display on/off Control |
| 284 | else if (BIT(m_data_latch, 3)) // Display on/off Control |
| 264 | 285 | { |
| 265 | | m_display_on = BIT(data, 2); |
| 266 | | m_cursor_on = BIT(data, 1); |
| 267 | | m_blink_on = BIT(data, 0); |
| 286 | m_display_on = BIT(m_data_latch, 2); |
| 287 | m_cursor_on = BIT(m_data_latch, 1); |
| 288 | m_blink_on = BIT(m_data_latch, 0); |
| 268 | 289 | |
| 269 | 290 | set_busy_flag(37); |
| 270 | 291 | } |
| 271 | | else if (BIT(data, 2)) // Entry Mode set |
| 292 | else if (BIT(m_data_latch, 2)) // Entry Mode set |
| 272 | 293 | { |
| 273 | | m_direction = (BIT(data, 1)) ? +1 : -1; |
| 294 | m_direction = (BIT(m_data_latch, 1)) ? +1 : -1; |
| 274 | 295 | |
| 275 | | m_shift_on = BIT(data, 0); |
| 296 | m_shift_on = BIT(m_data_latch, 0); |
| 276 | 297 | |
| 277 | 298 | set_busy_flag(37); |
| 278 | 299 | } |
| 279 | | else if (BIT(data, 1)) // return home |
| 300 | else if (BIT(m_data_latch, 1)) // return home |
| 280 | 301 | { |
| 281 | 302 | m_ac = 0; |
| 282 | 303 | m_cursor_pos = 0; |
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| 285 | 306 | m_disp_shift = 0; |
| 286 | 307 | set_busy_flag(1520); |
| 287 | 308 | } |
| 288 | | else if (BIT(data, 0)) // clear display |
| 309 | else if (BIT(m_data_latch, 0)) // clear display |
| 289 | 310 | { |
| 290 | 311 | m_ac = 0; |
| 291 | 312 | m_cursor_pos = 0; |
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| 299 | 320 | |
| 300 | 321 | READ8_MEMBER(hd44780_device::control_read) |
| 301 | 322 | { |
| 302 | | return (m_busy_flag << 7) | (m_ac & 0x7f); |
| 323 | if (m_data_len == 0) |
| 324 | { |
| 325 | m_nibble = !m_nibble; |
| 326 | |
| 327 | if (m_nibble) |
| 328 | return (m_busy_flag << 7) | (m_ac & 0x70); |
| 329 | else |
| 330 | return (m_ac<<4) & 0xf0; |
| 331 | } |
| 332 | else |
| 333 | { |
| 334 | return (m_busy_flag << 7) | (m_ac & 0x7f); |
| 335 | } |
| 303 | 336 | } |
| 304 | 337 | |
| 305 | 338 | void hd44780_device::update_ac(void) // m_data_bus_flag was left as global so old savestates will work |
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| 324 | 357 | return; |
| 325 | 358 | } |
| 326 | 359 | |
| 360 | if (m_data_len == 0) |
| 361 | { |
| 362 | m_nibble = !m_nibble; |
| 363 | |
| 364 | if (m_nibble) |
| 365 | { |
| 366 | m_data_latch = data & 0xf0; |
| 367 | return; |
| 368 | } |
| 369 | else |
| 370 | { |
| 371 | m_data_latch |= ((data>>4) & 0x0f); |
| 372 | } |
| 373 | } |
| 374 | else |
| 375 | { |
| 376 | m_data_latch = data; |
| 377 | } |
| 378 | |
| 327 | 379 | if (m_ac_mode == 0) |
| 328 | | m_ddram[m_ac] = data; |
| 380 | m_ddram[m_ac] = m_data_latch; |
| 329 | 381 | else |
| 330 | | m_cgram[m_ac] = data; |
| 382 | m_cgram[m_ac] = m_data_latch; |
| 331 | 383 | |
| 332 | 384 | m_data_bus_flag = 1; |
| 333 | 385 | update_ac(); |
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| 343 | 395 | else |
| 344 | 396 | data = m_cgram[m_ac]; |
| 345 | 397 | |
| 398 | if (m_data_len == 0) |
| 399 | { |
| 400 | m_nibble = !m_nibble; |
| 401 | |
| 402 | if (m_nibble) |
| 403 | return data & 0xf0; |
| 404 | else |
| 405 | data = (data<<4) & 0xf0; |
| 406 | } |
| 407 | |
| 346 | 408 | m_data_bus_flag = 2; |
| 347 | 409 | update_ac(); |
| 348 | 410 | |