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| author | Miquel Sabaté Solà <mssola@mssola.com> | 2026-04-09 00:33:04 +0200 |
|---|---|---|
| committer | Miquel Sabaté Solà <mssola@mssola.com> | 2026-04-10 13:32:44 +0200 |
| commit | 1978afbc18ffb227f0ce36663648e00d1d2d7945 (patch) | |
| tree | 10584b63468ca718be84a40ef2c34ef99cb75924 /scroll/include/ppu.s | |
| parent | 21a599651c07ee021d0f211ba45add538acd0f4a (diff) | |
| download | code.nes-1978afbc18ffb227f0ce36663648e00d1d2d7945.tar.gz code.nes-1978afbc18ffb227f0ce36663648e00d1d2d7945.zip | |
Add the sound/beep.s example
This is the most simple example you can come up when it comes to
producing sound on the NES/Famicom. Basically, a single note is
delivered to the APU which is continuously on.
Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
Diffstat (limited to 'scroll/include/ppu.s')
| -rw-r--r-- | scroll/include/ppu.s | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/scroll/include/ppu.s b/scroll/include/ppu.s index 34410a0..f62d702 100644 --- a/scroll/include/ppu.s +++ b/scroll/include/ppu.s @@ -1,3 +1,15 @@ +;; WRITE_PPU_DATA is a macro that will write into PPUADDR the given address and +;; into PPUDATA the given byte value. +.macro WRITE_PPU_DATA address, value + bit $2002 + lda #.HIBYTE(address) + sta $2006 + lda #.LOBYTE(address) + sta $2006 + lda #value + sta $2007 +.endmacro + .scope PPU CONTROL = $2000 MASK = $2001 |