mirror of
https://git.sr.ht/~rabbits/uxn
synced 2024-11-05 13:55:06 +00:00
102 lines
2.9 KiB
Tal
102 lines
2.9 KiB
Tal
( devices )
|
|
|
|
|00 @System [ &vector $2 &wst $1 &rst $1 &pad $4 &r $2 &g $2 &b $2 &debug $1 &halt $1 ]
|
|
|10 @Console [ &vector $2 &read $1 &pad $5 &write $1 &error $1 ]
|
|
|a0 @File [ &vector $2 &name $2 &length $2 &success $2 &load $2 &save $2 &stat $2 &delete $1 ]
|
|
|
|
( vectors )
|
|
|
|
|0100 @reset
|
|
(
|
|
Set the log level for helping to debug stuff.
|
|
Its value is the bitwise OR of all the following output types:
|
|
#01 prints the number of lines in the source code,
|
|
#04 dumps all defined labels at end, and
|
|
#08 prints the heap usage.
|
|
)
|
|
#0d ;asma/log-level STA
|
|
|
|
;asma-heap ;heap STA2
|
|
|
|
(
|
|
Assemble the source code into an output ROM file.
|
|
|
|
If all you want is to use asma.tal to assemble files, insert a BRK
|
|
after this statement.
|
|
)
|
|
;&source-file ;&dest-file ;asma-assemble-file JSR2
|
|
|
|
(
|
|
If an error has occurred, BRK here, otherwise continue. (The error
|
|
message will already have been printed to the Console in
|
|
asma-assemble-file.)
|
|
)
|
|
;asma/error LDA2 #0000 EQU2 JMP BRK
|
|
|
|
(
|
|
Load the output ROM over the currently running program, almost as if
|
|
we loaded the ROM with uxnemu directly!
|
|
|
|
It's not a totally pristine environment, as File/load doesn't zero out
|
|
memory beyond the end of the file. So if the assembled program assumes
|
|
that all memory above it is zero, it may misbehave.
|
|
|
|
Asma itself doesn't use the zero page, but this example code writes a
|
|
DEO2 instruction to 0x00ff. In order to execute File/load and have the
|
|
CPU continue at memory location 0x0100, we write the final DEO2
|
|
instruction there and jump there as our final act.
|
|
|
|
Just in case the assembled code is zero-length (which can occur when
|
|
assembling an empty source file), we write a BRK to the reset vector so
|
|
that will prevent an infinite loop.
|
|
)
|
|
;&dest-file .File/name DEO2
|
|
#ff00 .File/length DEO2
|
|
#0100 .File/load
|
|
LIT DEO2 #00ff STA
|
|
LIT BRK #0100 STA
|
|
#00ff JMP2
|
|
|
|
&source-file
|
|
"projects/examples/demos/piano.tal 00
|
|
&dest-file
|
|
"bin/asma-boot.rom 00
|
|
|
|
include projects/library/asma.tal
|
|
|
|
(
|
|
Heap, a large temporary area for keeping track of labels. More complex
|
|
programs need more of this space. If there's insufficient space then the
|
|
assembly process will fail, but having extra space above what the most
|
|
complex program needs provides no benefit.
|
|
|
|
This heap, and the buffers below, are free to be used to hold temporary
|
|
data between assembly runs, and do not need to be initialized with any
|
|
particular contents to use the assembler.
|
|
)
|
|
|
|
@asma-heap
|
|
|
|
|e000 &end
|
|
|
|
(
|
|
Buffer for use with loading source code.
|
|
The minimum size is the length of the longest token plus one, which is
|
|
0x21 to keep the same capability of the C assembler.
|
|
Larger sizes are more efficient, provided there is enough
|
|
heap space to keep track of all the labels.
|
|
)
|
|
|
|
@asma-read-buffer
|
|
|
|
|f800 &end
|
|
|
|
(
|
|
Buffer for use with writing output.
|
|
The minimum size is 1, and larger sizes are more efficient.
|
|
)
|
|
|
|
@asma-write-buffer
|
|
|
|
|ffff &end
|
|
|