Sega Genesis Dev Kit (SGDK)

[Chilly Willy]

I'd add the directories to the dependencies, then have one rule to make them. If they exist, the dependencies are met and the rule isn't used; if they don't, the rule creates them.

[Stef]

Not sure if that work but i should try I agree the way i did in the makefile is not very elegant but i could not figure any other way to do what i want to do (basically having all object files in separate "out" directory).

[bioloid]

I can't find the setVBlankCallback/setHBlankCallback in the sdk, it has been removed/renamed ?

[bioloid]

SYS_setVIntCallback ok!

[Stef]

Yeah they have been renamed :p

[lingh]

Hey, what about save support in sgdk, is there any?
Can somebody write me example with SRAM?

[Stef]

The current version does not have direct support for SRAM (the incoming one will have) but you can give a shot on this topic which explain how use SRAM with SGDK :
viewtopic.php?t=1227

[lingh]

Ok, that was easy. My project seems to work fine.
http://www.mediafire.com/download.php?2kc1ckum0p5kef8

Am i understand all correct?
And i have 1 more question. In this thread people saying, what you cannot use sram in the game over 2 Mb. How exactly you can get around this?

you need to disable ints, turn on the sram, read/write it, turn off the sram, then enable ints.

I am total noob now in this, but what this ints exactly?

[TmEE co.(TM)]

interrupts
VBL (frame) and HBL (line)

[lingh]

interrupts
VBL (frame) and HBL (line)

Ok, i found function void SYS_setInterruptMaskLevel (u16 value) in documentation.
So i need to disable this Vertical interrupt (V-INT) Horizontal interrupt (H-INT) interrupts?

[Stef]

Exactly
Use

Code: Select all

SYS_setInterruptMaskLevel(7)

to prevent any VDP interrupt then use

Code: Select all

SYS_setInterruptMaskLevel(3)

to re enable them. We don't care about the external interrupt.

[Chilly Willy]

Exactly
Use

Code: Select all

SYS_setInterruptMaskLevel(7)

to prevent any VDP interrupt then use

Code: Select all

SYS_setInterruptMaskLevel(3)

to re enable them. We don't care about the external interrupt.

Unless you're using the light gun support in the controller code, then you need to use level 1, not level 3.

Not a big deal... you'll know if you're using a light gun as you need to look if they're available and then set the controller support to turn on the gun(s).

[Stef]

Exactly
Use

Code: Select all

SYS_setInterruptMaskLevel(7)

to prevent any VDP interrupt then use

Code: Select all

SYS_setInterruptMaskLevel(3)

to re enable them. We don't care about the external interrupt.

Unless you're using the light gun support in the controller code, then you need to use level 1, not level 3.

Not a big deal... you'll know if you're using a light gun as you need to look if they're available and then set the controller support to turn on the gun(s).

External is not level 2 ? but as we don't need it we usually set mask interrupt to 3 (so horizontal interrupt are not masked)

[bioloid]

about, HBlank method: 0x40000010 is used to set APLAN scrolling on the GFX_CTRL_PORT, what's the address of the BPLAN please ?

[Stef]

I guess you are speaking about the default configuration in SGDK ?
Here're the infos taken from vdp.h file :

Code: Select all

#define WPLAN                   0xB000
#define HSCRL                   0xB800
#define SLIST                   0xBC00
#define APLAN                   0xC000
#define BPLAN                   0xE000