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98 lines
1.5 KiB
NASM
98 lines
1.5 KiB
NASM
; stdio
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;
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; Allows other modules to print to "standard out", that is, the console through
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; which the user is connected in a decoupled manner.
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;
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; *** REQUIREMENTS ***
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; blkdev. select the block device you want to use as stdio just before you call
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; stdioInit.
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; *** VARIABLES ***
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; Used to store formatted hex values just before printing it.
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STDIO_HEX_FMT .equ STDIO_RAMSTART
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STDIO_GETC .equ STDIO_HEX_FMT+2
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STDIO_PUTC .equ STDIO_GETC+2
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STDIO_RAMEND .equ STDIO_PUTC+2
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; Select the blockdev to use as stdio before calling this.
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stdioInit:
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push hl
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ld hl, (BLOCKDEV_GETC)
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ld (STDIO_GETC), hl
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ld hl, (BLOCKDEV_PUTC)
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ld (STDIO_PUTC), hl
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pop hl
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ret
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stdioGetC:
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ld ix, (STDIO_GETC)
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jp (ix)
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stdioPutC:
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ld ix, (STDIO_PUTC)
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jp (ix)
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; print null-terminated string pointed to by HL
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printstr:
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push af
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push hl
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.loop:
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ld a, (hl) ; load character to send
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or a ; is it zero?
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jr z, .end ; if yes, we're finished
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call stdioPutC
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inc hl
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jr .loop
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.end:
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pop hl
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pop af
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ret
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; print A characters from string that HL points to
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printnstr:
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push bc
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push hl
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ld b, a
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.loop:
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ld a, (hl) ; load character to send
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call stdioPutC
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inc hl
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djnz .loop
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.end:
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pop hl
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pop bc
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ret
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printcrlf:
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ld a, ASCII_CR
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call stdioPutC
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ld a, ASCII_LF
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call stdioPutC
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ret
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; Print the hex char in A
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printHex:
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push af
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push hl
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ld hl, STDIO_HEX_FMT
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call fmtHexPair
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ld a, 2
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call printnstr
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pop hl
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pop af
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ret
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; Print the hex pair in HL
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printHexPair:
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push af
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ld a, h
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call printHex
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ld a, l
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call printHex
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pop af
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ret
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