mirror of
https://github.com/hsoft/collapseos.git
synced 2024-09-07 09:58:45 +10:00
e0bcf3473e
Rename ROWS to LINES (it's what VE uses). Also, don't use COLS and LINES as immediates in the Grid subsystem: we expect those words to be available at runtime.
56 lines
1.7 KiB
Plaintext
56 lines
1.7 KiB
Plaintext
# Protocols
|
|
|
|
Some subsystems (and in the case of KEY and EMIT, the core) re-
|
|
quire drivers to implement certain words in a certain way. For
|
|
example, the core requires drivers to implement (key) and (emit)
|
|
or else it won't know how to provide a console.
|
|
|
|
These protocols are described here.
|
|
|
|
# TTY protocol
|
|
|
|
(key) -- c Returns the next typed key on the console.
|
|
If none, block until there is one.
|
|
(emit) c -- Spit a character on the console.
|
|
|
|
# PS/2 protocol
|
|
|
|
This protocol enables communication with a device that spits
|
|
PS/2 keycodes.
|
|
|
|
(ps2kc) -- kc Returns the next typed PS/2 keycode from the
|
|
console. Blocking.
|
|
|
|
# SPI Relay protocol
|
|
|
|
This protocol enables communication with a SPI relay. This
|
|
protocol is designed to support devices with multiple endpoints.
|
|
To that end, (spie) takes a device ID argument, with a meaning
|
|
that is up to the device itself. To disable all devices, supply
|
|
0 to (spie).
|
|
|
|
We expect relay devices to support only one enabled device at
|
|
once. Enabling a specific device is expected to disable the
|
|
previously enabled one.
|
|
|
|
(spie) n -- Enable SPI device
|
|
(spix) n -- n Perform SPI exchange (push a number, get a
|
|
number back)
|
|
|
|
# Grid protocol
|
|
|
|
A grid is a device that shows as a grid of ASCII characters and
|
|
allows random access to it.
|
|
|
|
COLS -- n Number of columns in the device
|
|
LINES -- n Number of lines in the device
|
|
CELL! g pos -- Set glyph at pos
|
|
|
|
"pos" is a simple number (y * cols) + x. For example, if we
|
|
have 40 columns per line, the position (x, y) (12, 10) is 412.
|
|
|
|
A glyph is ASCII-0x20. If the resulting glyph number exceeds the
|
|
number of glyphs in the font, it's up to CELL! to ignore it.
|
|
|
|
Glyph 0 is always blank.
|