Mercurial > repos > blastem
diff vdp.c @ 2358:4b2ac43c106e
Give debugger expression engine access to VDP and Sub CPU values. Add basic variable support
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Sat, 28 Oct 2023 00:52:10 -0700 |
| parents | bc17ece8dd00 |
| children | 04d29635d238 |
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--- a/vdp.c Fri Oct 27 23:49:04 2023 -0700 +++ b/vdp.c Sat Oct 28 00:52:10 2023 -0700 @@ -716,13 +716,10 @@ context->address, context->cd, cd_name(context->cd), (context->flags & FLAG_PENDING) ? "word" : (context->flags2 & FLAG2_BYTE_PENDING) ? "byte" : "none", context->vcounter, context->hslot*2, (context->flags2 & FLAG2_VINT_PENDING) ? "true" : "false", - (context->flags2 & FLAG2_HINT_PENDING) ? "true" : "false", vdp_control_port_read(context)); + (context->flags2 & FLAG2_HINT_PENDING) ? "true" : "false", vdp_status(context)); printf("\nDebug Register: %X | Output disabled: %s, Force Layer: %d\n", context->test_port, (context->test_port & TEST_BIT_DISABLE) ? "true" : "false", context->test_port >> 7 & 3 ); - //restore flags as calling vdp_control_port_read can change them - context->flags = old_flags; - context->flags2 = old_flags2; } static uint8_t is_active(vdp_context *context) @@ -4831,10 +4828,8 @@ context->test_port = value; } -uint16_t vdp_control_port_read(vdp_context * context) +uint16_t vdp_status(vdp_context *context) { - context->flags &= ~FLAG_PENDING; - context->flags2 &= ~FLAG2_BYTE_PENDING; //Bits 15-10 are not fixed like Charles MacDonald's doc suggests, but instead open bus values that reflect 68K prefetch uint16_t value = context->system->get_open_bus_value(context->system) & 0xFC00; if (context->fifo_read < 0) { @@ -4848,11 +4843,9 @@ } if (context->flags & FLAG_DOT_OFLOW) { value |= 0x40; - context->flags &= ~FLAG_DOT_OFLOW; } if (context->flags2 & FLAG2_SPRITE_COLLIDE) { value |= 0x20; - context->flags2 &= ~FLAG2_SPRITE_COLLIDE; } if ((context->regs[REG_MODE_4] & BIT_INTERLACE) && !(context->flags2 & FLAG2_EVEN_FIELD)) { value |= 0x10; @@ -4876,6 +4869,14 @@ if (context->flags2 & FLAG2_REGION_PAL) { value |= 0x1; } + return value; +} + +uint16_t vdp_control_port_read(vdp_context * context) +{ + uint16_t value = vdp_status(context); + context->flags &= ~(FLAG_DOT_OFLOW|FLAG_PENDING); + context->flags2 &= ~(FLAG2_SPRITE_COLLIDE|FLAG2_BYTE_PENDING); //printf("status read at cycle %d returned %X\n", context->cycles, value); return value; }