; =============================================================================
; Nintendo Entertainment System hardware symbols
; =============================================================================

; -----------------------------------------------------------------------------
; PPU registers
; -----------------------------------------------------------------------------

PPUCTRL             = $2000
PPUMASK             = $2001
PPUSTATUS           = $2002
OAMADDR             = $2003
OAMDATA             = $2004
PPUSCROLL           = $2005
PPUADDR             = $2006
PPUDATA             = $2007

OAMDMA              = $4014

; -----------------------------------------------------------------------------
; Controller ports
;
; $4016:
;   Write: controller strobe
;   Read:  controller port 1
;
; $4017:
;   Read:  controller port 2
;   Write: APU frame counter
; -----------------------------------------------------------------------------

JOY1                = $4016
JOY2                = $4017

; -----------------------------------------------------------------------------
; APU pulse channel 1
; -----------------------------------------------------------------------------

APUPULSE1CTRL       = $4000
APUPULSE1SWEEP      = $4001
APUPULSE1TIMERLO    = $4002
APUPULSE1TIMERHI    = $4003

; -----------------------------------------------------------------------------
; APU pulse channel 2
; -----------------------------------------------------------------------------

APUPULSE2CTRL       = $4004
APUPULSE2SWEEP      = $4005
APUPULSE2TIMERLO    = $4006
APUPULSE2TIMERHI    = $4007

; -----------------------------------------------------------------------------
; APU triangle channel
; -----------------------------------------------------------------------------

APUTRIANGLECTRL     = $4008
APUTRIANGLETIMERLO  = $400A
APUTRIANGLETIMERHI  = $400B

; -----------------------------------------------------------------------------
; APU noise channel
; -----------------------------------------------------------------------------

APUNOISECTRL        = $400C
APUNOISEPERIOD      = $400E
APUNOISELENGTH      = $400F

; -----------------------------------------------------------------------------
; APU DMC channel
; -----------------------------------------------------------------------------

APUDMCCTRL          = $4010
APUDMCDIRECT        = $4011
APUDMCADDR          = $4012
APUDMCLENGTH        = $4013

; -----------------------------------------------------------------------------
; APU status and frame counter
;
; $4015:
;   Write: enable or disable the five APU channels
;   Read:  channel and interrupt status
;
; $4017:
;   Write: APU frame-counter mode and IRQ inhibit
;   Read:  controller port 2
; -----------------------------------------------------------------------------

APUSTATUS           = $4015
APUFRAMECOUNTER     = $4017

; -----------------------------------------------------------------------------
; Controller masks
; -----------------------------------------------------------------------------

PAD_RIGHT           = $01
PAD_LEFT            = $02
PAD_DOWN            = $04
PAD_UP              = $08
PAD_START           = $10
PAD_SELECT          = $20
PAD_B               = $40
PAD_A               = $80

PAD_HORIZONTAL      = PAD_LEFT | PAD_RIGHT
PAD_VERTICAL        = PAD_UP | PAD_DOWN
PAD_DPAD            = PAD_HORIZONTAL | PAD_VERTICAL