Mercurial > repos > blastem

comparison lc8951.c @ 2350:f8b5142c06aa

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Allow 68K to return mid-instruction. Adjust how 68K interrupt ack works so int2 busy flag timing is more correct. Fix some other SCD timing issues
author Michael Pavone <pavone@retrodev.com>
date Mon, 16 Oct 2023 23:30:04 -0700
parents 9f0c67e5c50a
children 0871f555eff6
comparison
equal deleted inserted replaced
2349:f0fc6c09517d 2350:f8b5142c06aa
291 } 291 }
292 } 292 }
293 } 293 }
294 } 294 }
295 295
296 void lc8951_resume_transfer(lc8951 *context, uint32_t cycle) 296 void lc8951_resume_transfer(lc8951 *context)
297 { 297 {
298 if (context->triggered && context->transfer_end == CYCLE_NEVER && (context->ifctrl & BIT_DOUTEN)) { 298 if (context->triggered && context->transfer_end == CYCLE_NEVER && (context->ifctrl & BIT_DOUTEN)) {
299 uint16_t transfer_size = context->regs[DBCL] | (context->regs[DBCH] << 8); 299 uint16_t transfer_size = context->regs[DBCL] | (context->regs[DBCH] << 8);
300 //HACK!!! Work around Sub CPU running longer than we would like and dragging other components with it
301 uint32_t step_diff = (context->cycle - cycle) / context->clock_step;
302 if (step_diff) {
303 context->cycle -= step_diff * context->clock_step;
304 }
305 context->transfer_end = context->cycle + transfer_size * context->cycles_per_byte; 300 context->transfer_end = context->cycle + transfer_size * context->cycles_per_byte;
306 context->next_byte_cycle = context->cycle; 301 context->next_byte_cycle = context->cycle;
307 if (step_diff) {
308 lc8951_run(context, cycle);
309 }
310 } 302 }
311 } 303 }
312 304
313 void lc8951_write_byte(lc8951 *context, uint32_t cycle, int sector_offset, uint8_t byte) 305 void lc8951_write_byte(lc8951 *context, uint32_t cycle, int sector_offset, uint8_t byte)
314 { 306 {