2021-06-19 20:11:26 +00:00
|
|
|
/// @file
|
2021-06-19 19:26:05 +00:00
|
|
|
/// A lightweight library for printing on the C64.
|
2021-06-19 20:28:44 +00:00
|
|
|
///
|
2021-06-19 19:26:05 +00:00
|
|
|
/// Printing with this library is done by calling print_ function for each element
|
2020-12-21 07:57:41 +00:00
|
|
|
// Commodore 64 PRG executable file
|
|
|
|
.file [name="struct-ptr-26.prg", type="prg", segments="Program"]
|
|
|
|
.segmentdef Program [segments="Basic, Code, Data"]
|
|
|
|
.segmentdef Basic [start=$0801]
|
|
|
|
.segmentdef Code [start=$80d]
|
|
|
|
.segmentdef Data [startAfter="Code"]
|
|
|
|
.segment Basic
|
2019-09-04 21:09:27 +00:00
|
|
|
:BasicUpstart(main)
|
2020-06-27 18:32:09 +00:00
|
|
|
.label print_screen = $400
|
2019-09-04 21:09:27 +00:00
|
|
|
.label print_char_cursor = 2
|
2020-12-21 07:57:41 +00:00
|
|
|
.segment Code
|
2019-09-04 21:09:27 +00:00
|
|
|
main: {
|
|
|
|
.label file = $4000
|
|
|
|
.label uSize = 4
|
2021-05-10 19:27:14 +00:00
|
|
|
// file->bufEdit = (BYTE*)4
|
2019-09-04 21:09:27 +00:00
|
|
|
lda #<4
|
|
|
|
sta file
|
|
|
|
lda #>4
|
|
|
|
sta file+1
|
2020-02-23 08:44:36 +00:00
|
|
|
// uSize = *ptrw
|
2019-09-04 21:09:27 +00:00
|
|
|
ldy #$1e
|
2019-09-04 21:11:35 +00:00
|
|
|
lda file
|
|
|
|
sta.z $fe
|
|
|
|
lda file+1
|
|
|
|
sta.z $ff
|
2019-09-04 21:09:27 +00:00
|
|
|
lda ($fe),y
|
|
|
|
sta.z uSize
|
|
|
|
iny
|
|
|
|
lda ($fe),y
|
|
|
|
sta.z uSize+1
|
2020-04-13 18:00:13 +00:00
|
|
|
// print_uint(uSize)
|
|
|
|
jsr print_uint
|
2020-02-23 08:44:36 +00:00
|
|
|
// }
|
2019-09-04 21:09:27 +00:00
|
|
|
rts
|
|
|
|
}
|
2020-04-13 18:00:13 +00:00
|
|
|
// Print a unsigned int as HEX
|
2021-08-10 15:48:55 +00:00
|
|
|
// void print_uint(__zp(4) unsigned int w)
|
2020-04-13 18:00:13 +00:00
|
|
|
print_uint: {
|
2019-09-04 21:09:27 +00:00
|
|
|
.label w = 4
|
2021-06-12 18:57:35 +00:00
|
|
|
// print_uchar(BYTE1(w))
|
2020-03-22 21:26:39 +00:00
|
|
|
ldx.z w+1
|
2020-06-27 18:32:09 +00:00
|
|
|
lda #<print_screen
|
2019-09-04 21:09:27 +00:00
|
|
|
sta.z print_char_cursor
|
2020-06-27 18:32:09 +00:00
|
|
|
lda #>print_screen
|
2019-09-04 21:09:27 +00:00
|
|
|
sta.z print_char_cursor+1
|
2020-04-13 18:06:30 +00:00
|
|
|
jsr print_uchar
|
2021-06-12 18:57:35 +00:00
|
|
|
// print_uchar(BYTE0(w))
|
2020-03-22 21:26:39 +00:00
|
|
|
ldx.z w
|
2020-04-13 18:06:30 +00:00
|
|
|
jsr print_uchar
|
2020-02-23 08:44:36 +00:00
|
|
|
// }
|
2019-09-04 21:09:27 +00:00
|
|
|
rts
|
|
|
|
}
|
2020-04-13 18:00:13 +00:00
|
|
|
// Print a char as HEX
|
2021-08-10 15:48:55 +00:00
|
|
|
// void print_uchar(__register(X) char b)
|
2020-04-13 18:06:30 +00:00
|
|
|
print_uchar: {
|
2020-02-23 08:44:36 +00:00
|
|
|
// b>>4
|
2019-09-04 21:09:27 +00:00
|
|
|
txa
|
|
|
|
lsr
|
|
|
|
lsr
|
|
|
|
lsr
|
|
|
|
lsr
|
2020-02-23 08:44:36 +00:00
|
|
|
// print_char(print_hextab[b>>4])
|
2019-09-04 21:09:27 +00:00
|
|
|
tay
|
|
|
|
lda print_hextab,y
|
2020-03-07 21:38:40 +00:00
|
|
|
// Table of hexadecimal digits
|
2019-09-04 21:09:27 +00:00
|
|
|
jsr print_char
|
2024-01-02 18:45:16 +00:00
|
|
|
// b&0xf
|
2019-09-04 21:09:27 +00:00
|
|
|
lda #$f
|
|
|
|
axs #0
|
2024-01-02 18:45:16 +00:00
|
|
|
// print_char(print_hextab[b&0xf])
|
2019-09-04 21:09:27 +00:00
|
|
|
lda print_hextab,x
|
|
|
|
jsr print_char
|
2020-02-23 08:44:36 +00:00
|
|
|
// }
|
2019-09-04 21:09:27 +00:00
|
|
|
rts
|
|
|
|
}
|
|
|
|
// Print a single char
|
2021-08-10 15:48:55 +00:00
|
|
|
// void print_char(__register(A) char ch)
|
2019-09-04 21:09:27 +00:00
|
|
|
print_char: {
|
2020-02-23 08:44:36 +00:00
|
|
|
// *(print_char_cursor++) = ch
|
2019-09-04 21:09:27 +00:00
|
|
|
ldy #0
|
|
|
|
sta (print_char_cursor),y
|
2020-02-23 08:44:36 +00:00
|
|
|
// *(print_char_cursor++) = ch;
|
2019-09-04 21:09:27 +00:00
|
|
|
inc.z print_char_cursor
|
|
|
|
bne !+
|
|
|
|
inc.z print_char_cursor+1
|
|
|
|
!:
|
2020-02-23 08:44:36 +00:00
|
|
|
// }
|
2019-09-04 21:09:27 +00:00
|
|
|
rts
|
|
|
|
}
|
2020-12-21 07:57:41 +00:00
|
|
|
.segment Data
|
2019-09-04 21:09:27 +00:00
|
|
|
print_hextab: .text "0123456789abcdef"
|