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New uploader that can be hiding in top of memory waiting for a BLL-kind of

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loadable application over the ComLynx serial port. By Karri Kaksonen.


git-svn-id: svn://svn.cc65.org/cc65/trunk@4982 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz 2011-04-06 19:54:55 +00:00
parent 3eccb74a0a
commit d78e52fd40
3 changed files with 129 additions and 1 deletions
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3
libsrc/lynx/Makefile
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@ -64,7 +64,8 @@ OBJS = bllhdr.o \
oserror.o \
read.o \
sysuname.o \
toascii.o
toascii.o \
uploader.o
#--------------------------------------------------------------------------
# Drivers

79
libsrc/lynx/uploader.s Normal file
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@ -0,0 +1,79 @@
.include "lynx.inc"
.include "extzp.inc"
.interruptor _UpLoaderIRQ
.export __UPLOADER__: absolute = 1
load_len=_FileDestAddr
load_ptr=_FileFileLen
load_ptr2=_FileCurrBlock
.segment "UPCODE"
ComLynxReadAndExec:
ldy #4
loop0:
jsr read_byte
sta load_len-1,y
dey
bne loop0 ; get destination and length
tax ; lowbyte of length
lda load_ptr
sta load_ptr2
lda load_ptr+1
sta load_ptr2+1
loop1:
inx
bne cont1
inc load_len+1
bne cont1
jmp (load_ptr)
cont1:
jsr read_byte
sta (load_ptr2),y
sta PALETTE ; feedback ;-)
iny
bne loop1
inc load_ptr2+1
bra loop1
read_byte:
bit SERCTL
bvc read_byte
lda SERDAT
rts
_UpLoaderIRQ:
lda INTSET
and #$10
bne @L0
clc
rts
@L0:
lda SERDAT ; wait for the start sequence
bit flag ; already seen $81 ?
bpl again ; >= 0 => no
cmp #$50 ; "P" ?
bne again ; not correct, so clear flag
sei
jmp ComLynxReadAndExec
again:
stz flag
cmp #$81
bne exit
sta flag
;
; last action : clear interrupt
;
exit:
clc
rts
.segment "UPDATA"
flag:
.byte 0

48
src/ld65/cfg/lynx-uploader.cfg Normal file
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@ -0,0 +1,48 @@
SYMBOLS {
__STACKSIZE__: type = weak, value = $0800; # 2k stack
__STARTOFDIRECTORY__: type = weak, value = $00DF; # start just after loader
__BLOCKSIZE__: type = weak, value = 1024; # cart block size
__EXEHDR__: type = import;
__BOOTLDR__: type = import;
__DEFDIR__: type = import;
__UPLOADER__: type = import;
}
MEMORY {
ZP: file = "", define = yes, start = $0000, size = $0100;
HEADER: file = %O, start = $0000, size = $0040;
BOOT: file = %O, start = $0200, size = __STARTOFDIRECTORY__;
DIR: file = %O, start = $0000, size = 8;
RAM: file = %O, define = yes, start = $0200, size = $BD38 - __STACKSIZE__;
UPLDR: file = %O, define = yes, start = $BFDC, size = $005C;
}
SEGMENTS {
EXEHDR: load = HEADER, type = ro;
BOOTLDR: load = BOOT, type = ro;
DIRECTORY:load = DIR, type = ro;
STARTUP: load = RAM, type = ro, define = yes;
LOWCODE: load = RAM, type = ro, optional = yes;
INIT: load = RAM, type = ro, define = yes, optional = yes;
CODE: load = RAM, type = ro, define = yes;
RODATA: load = RAM, type = ro, define = yes;
DATA: load = RAM, type = rw, define = yes;
BSS: load = RAM, type = bss, define = yes;
UPCODE: load = UPLDR, type = ro, define = yes;
UPDATA: load = UPLDR, type = rw, define = yes;
ZEROPAGE: load = ZP, type = zp;
EXTZP: load = ZP, type = zp, optional = yes;
APPZP: load = ZP, type = zp, optional = yes;
}
FEATURES {
CONDES: segment = INIT,
type = constructor,
label = __CONSTRUCTOR_TABLE__,
count = __CONSTRUCTOR_COUNT__;
CONDES: segment = RODATA,
type = destructor,
label = __DESTRUCTOR_TABLE__,
count = __DESTRUCTOR_COUNT__;
CONDES: segment = RODATA,
type = interruptor,
label = __INTERRUPTOR_TABLE__,
count = __INTERRUPTOR_COUNT__;
}