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remove back-channel from audio thread for now

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It needs some more thought before committing to it.
This commit is contained in:
Dennis Ranke
2022-04-24 15:52:19 +02:00
parent 491bf88ade
commit 2bf8938183
5 changed files with 9 additions and 35 deletions
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10
site/content/docs.md
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@@ -23,9 +23,7 @@ The memory has to be imported as `env` `memory` and has a maximum size of 256kb
00070-00078: reserved
00078-12c78: frame buffer
12c78-12c7c: sound registers/work area base address (for sndGes function)
12c7c-12c80: reserved
12c80-12ca0: sound data (synced from sound thread)
12ca0-13000: reserved
12c7c-13000: reserved
13000-13400: palette
13400-13c00: font
13c00-14000: reserved
@@ -283,8 +281,7 @@ MicroW8 actually runs two instances of your module. On the first instance, it ca
second instance, it calls `snd` instead with an incrementing sample index and expects that function to return sound samples for the left and right
channel at 44100 Hz. If your module does not export a `snd` function, it calls the api function `sndGes` instead.
As the only means of communication, 32 bytes starting at address 0x00050 are copied from main to sound memory after `upd` returns. At the same time,
32 bytes starting at 0x12c80 are copied from sound to main memory.
As the only means of communication, 32 bytes starting at address 0x00050 are copied from main to sound memory after `upd` returns.
By default, the `sndGes` function generates sound based on the 32 bytes at 0x00050. This means that in the default configuration those 32 bytes act
as sound registers. See the `sndGes` function for the meaning of those registers.
@@ -302,11 +299,12 @@ This implements a sound chip, generating sound based on 32 bytes of sound regist
The spec of this sound chip are:
- 4 channels
- 4 channels with individual volume control (0-15)
- rect, saw, tri, noise wave forms selectable per channel
- each wave form supports some kind of pulse width modulation
- each channel has an optional automatic low pass filter, or can be sent to one of two manually controllable filters
- each channel can select between a narrow and a wide stereo positioning. The two stereo positions of each channel are fixed.
- optional ring modulation
This function requires 1024 bytes of working memory, the first 32 bytes of which are interpreted as the sound registers.
The base address of its working memory can be configured by writing the address to 0x12c78. It defaults to 0x00050.