interrupt.h

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/*---------------------------------------------------------------------------------
 
    Interrupt registers and vector pointers
 
    Copyright (C) 2012-2017
        Alekmaul
 
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any
    damages arising from the use of this software.
 
    Permission is granted to anyone to use this software for any
    purpose, including commercial applications, and to alter it and
    redistribute it freely, subject to the following restrictions:
 
    1.  The origin of this software must not be misrepresented; you
        must not claim that you wrote the original software. If you use
        this software in a product, an acknowledgment in the product
        documentation would be appreciated but is not required.
 
    2.  Altered source versions must be plainly marked as such, and
        must not be misrepresented as being the original software.
 
    3.  This notice may not be removed or altered from any source
        distribution.
 
 
---------------------------------------------------------------------------------*/
 
#ifndef SNES_INTERRUPT_INCLUDE
#define SNES_INTERRUPT_INCLUDE
 
#include <snes/snestypes.h>
 
extern u8 vblank_flag;
 
extern u16 lag_frame_counter;
 
extern void *nmi_handler;
 
#define INT_VBLENABLE       (1 << 7) 
#define INT_HVIRQ_H         (1 << 4)   
#define INT_HVIRQ_V         (1 << 5)  
#define INT_HVIRQ_HV        (2 << 4)  
#define INT_JOYPAD_ENABLE   (1)  
#define VBL_READY           (1 << 7)     
#define HBL_READY           (1 << 6)     
#define PAD_BUSY            (1)           
 
#define REG_NMITIMEN (*(vuint8 *)0x4200)
 
/*
 
4207h/4208h - HTIMEL/HTIMEH - H-Count Timer Setting (W)
 
  15-9  Not used
  8-0   H-Count Timer Value (0..339) (+/-1 in long/short lines) (0=leftmost)
 
The H/V-IRQ flag in Bit7 of TIMEUP, Port 4211h gets set when the H-Counter gets equal to the H-Count register value.
 
4209h/420Ah - VTIMEL/VTIMEH - V-Count Timer Setting (W)
 
  15-9  Not used
  8-0   V-Count Timer Value (0..261/311, NTSC/PAL) (+1 in interlace) (0=top)
 
The H/V-IRQ flag in Bit7 of TIMEUP, Port 4211h gets set when the V-Counter gets equal to the V-Count register value.
*/
 
#define REG_RDNMI (*(vuint8 *)0x4210)
 
#define REG_TIMEUP (*(vuint8 *)0x4211)
 
#define REG_HVBJOY (*(vuint8 *)0x4212)
 
void nmiSet(void (*vblankRoutine)(void));
 
void WaitForVBlank(void);
 
#define WaitVBLFlag                   \
    while ((REG_HVBJOY & VBL_READY))  \
        ;                             \
    while (!(REG_HVBJOY & VBL_READY)) \
    {                                 \
    };
 
void WaitNVBlank(u16 ntime);
 
#endif // SNES_INTERRUPTS_INCLUDE