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| -rw-r--r-- | Short-beeping-noise-for-low-HP.md | 111 | ||||
| -rw-r--r-- | Tutorials.md | 2 |
2 files changed, 112 insertions, 1 deletions
diff --git a/Short-beeping-noise-for-low-HP.md b/Short-beeping-noise-for-low-HP.md new file mode 100644 index 0000000..ef46d88 --- /dev/null +++ b/Short-beeping-noise-for-low-HP.md @@ -0,0 +1,111 @@ +When your Pokémon's HP is in the red, the battle music is replaced by a continuous beeping noise. This can be quite annoying. If you want a brief alert that your HP is low, just follow this tutorial. + +Edit [audio/engine.asm](../blob/master/audio/engine.asm): + +```diff + UpdateChannels: + ... + + .Channel1: + ld a, [wLowHealthAlarm] ++ cp $ff ++ jr z, .Channel5 + bit DANGER_ON_F, a + ret nz + .Channel5: + ... +``` + +```diff + PlayDanger: + ld a, [wLowHealthAlarm] + bit DANGER_ON_F, a + ret z ++ cp $ff ++ ret z + +- ; Don't do anything if SFX is being played +- and $ff ^ (1 << DANGER_ON_F) + ld d, a + call _CheckSFX + jr c, .increment ++ ld a, d + + ; Play the high tone +- and a +- jr z, .begin ++ and $1f ++ ld hl, DangerSoundHigh ++ jr z, .applychannel + + ; Play the low tone + cp 16 ++ jr nz, .increment +- jr z, .halfway +- +- jr .increment +- +-.halfway + ld hl, DangerSoundLow +- jr .applychannel +- +-.begin +- ld hl, DangerSoundHigh + + .applychannel + xor a + ldh [rNR10], a + ld a, [hli] + ldh [rNR11], a + ld a, [hli] + ldh [rNR12], a + ld a, [hli] + ldh [rNR13], a + ld a, [hli] + ldh [rNR14], a + + .increment + ld a, d ++ and $e0 ++ ld e, a ++ ld a, d ++ and $1f + inc a + cp 30 ; Ending frame + jr c, .noreset +- xor a ++ add 2 + .noreset +- ; Make sure the danger sound is kept on +- or 1 << DANGER_ON_F ++ add e ++ jr nz, .load ++ dec a ++.load + ld [wLowHealthAlarm], a + + ; Enable channel 1 if it's off + ld a, [wSoundOutput] + and $11 + ret nz + ld a, [wSoundOutput] + or $11 + ld [wSoundOutput], a + ret + + DangerSoundHigh: + db $80 ; duty 50% + db $e2 ; volume 14, envelope decrease sweep 2 + db $50 ; frequency: $750 + db $87 ; restart sound + + DangerSoundLow: + db $80 ; duty 50% + db $e2 ; volume 14, envelope decrease sweep 2 + db $ee ; frequency: $6ee + db $86 ; restart sound +``` + +TODO: Explain changes. + +With this short edit, the noise will stop after just four beeps. It plays when your HP first turns red, and when you send out a Pokémon with low HP. diff --git a/Tutorials.md b/Tutorials.md index 6933cab..cd8201d 100644 --- a/Tutorials.md +++ b/Tutorials.md @@ -52,6 +52,7 @@ Tutorials may use diff syntax to show edits: - [Print text when you lose a trainer battle](Print-text-when-you-lose-a-trainer-battle) - [Correct grammar for plural trainers like Twins](Correct-grammar-for-plural-trainers-like-Twins) - [Custom order for the Old Pokédex mode](Custom-order-for-the-Old-Pokédex-mode) +- [Short beeping noise for low HP](Short-beeping-noise-for-low-HP) - [Remove the artificial save delay](Remove-the-artificial-save-delay) **Removing features:** @@ -98,7 +99,6 @@ Tutorials may use diff syntax to show edits: - Implement dynamic overhead+underfoot bridges - Sideways stairs, with step types for diagonal movement and collisions to trigger it - Pan the camera for cutscenes by making the player invisible -- Short beeping for low HP - Gain experience from catching Pokémon - Trainer dialog and music change for their last Pokémon - Items that act like overworld moves |