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settings.s
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settings.s
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; vim:syntax=z8a:ts=8
;
; msTERM
; settings routines manipulating dataflash
; https://github.com/jcs/mailstation-tools/blob/master/docs/flash-28SF040.pdf
;
; Copyright (c) 2019 joshua stein <[email protected]>
;
; Permission to use, copy, modify, and distribute this software for any
; purpose with or without fee is hereby granted, provided that the above
; copyright notice and this permission notice appear in all copies.
;
; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
; WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
; MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
; ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
; WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
; ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
; OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
;
.module settings
.include "mailstation.inc"
.equ SDP_LOCK, #SLOT_ADDR + 0x040a
.equ SDP_UNLOCK, #SLOT_ADDR + 0x041a
.equ settings_ident_0, 'j'
.equ settings_ident_1, 'c'
.equ settings_ident_2, 's'
.area _DATA
settings_begin:
settings_ident:
.db #settings_ident_0
.db #settings_ident_1
.db #settings_ident_2
_setting_modem_speed:
.dw #MODEM_DEFAULT_SPEED
_setting_default_source:
.db #SOURCE_WIFI
settings_end:
.area _CODE
; void settings_read(void)
_settings_read::
push bc
push de
push hl
in a, (#SLOT_DEVICE) ; store device and page
ld h, a
in a, (#SLOT_PAGE)
ld l, a
push hl
ld a, #DEVICE_DATAFLASH ; slot 4 device = dataflash
out (#SLOT_DEVICE), a
ld a, #settings_page
out (#SLOT_PAGE), a
ld hl, #SLOT_ADDR + (settings_sector * 256)
push hl
ld a, (hl)
cp #settings_ident_0 ; verify that the first 3 bytes are
jr nz, skip_loading ; our ident characters before loading
inc hl
ld a, (hl)
cp #settings_ident_1
jr nz, skip_loading
inc hl
ld a, (hl)
cp #settings_ident_2
jr nz, skip_loading
inc hl
ld bc, #settings_end - settings_begin
ld de, #settings_begin
pop hl
ldir ; ld (de), (hl), bc-- until bc == 0
push hl
skip_loading:
pop hl
pop hl
ld a, h
out (#SLOT_DEVICE), a
ld a, l
out (#SLOT_PAGE), a
pop hl
pop de
pop bc
ret
sdp:
ld a, (#SLOT_ADDR + 0x1823) ; 28SF040 Software Data Protection
ld a, (#SLOT_ADDR + 0x1820)
ld a, (#SLOT_ADDR + 0x1822)
ld a, (#SLOT_ADDR + 0x0418)
ld a, (#SLOT_ADDR + 0x041b)
ld a, (#SLOT_ADDR + 0x0419)
ret
; caller needs to read final SDP_LOCK or SDP_UNLOCK address
; void settings_write(void)
_settings_write::
push bc
push de
push hl
in a, (#SLOT_DEVICE) ; store device and page
ld h, a
in a, (#SLOT_PAGE)
ld l, a
push hl
ld a, #DEVICE_DATAFLASH ; slot 4 device = dataflash
out (#SLOT_DEVICE), a
xor a
out (#SLOT_PAGE), a ; slot 4 page = 0
call sdp
ld a, (#SDP_UNLOCK)
ld a, #settings_page
out (#SLOT_PAGE), a
ld hl, #SLOT_ADDR + (settings_sector * 256)
sector_erase:
ld (hl), #0x20 ; 28SF040 Sector-Erase Setup
ld (hl), #0xd0 ; 28SF040 Execute
sector_erase_wait:
ld a, (hl) ; wait until End-of-Write
ld b, a
ld a, (hl)
cp b
jr nz, sector_erase_wait
dump_setting_bytes:
ld de, #settings_begin
ld b, #settings_end - settings_begin
byte_program_loop:
ld a, (de)
ld c, a
ld (hl), #0x10 ; 28SF040 Byte-Program Setup
ld (hl), a ; 28SF040 Execute
byte_program:
ld a, (hl)
ld c, a
ld a, (hl) ; End-of-Write by reading it
cp c
jr nz, byte_program ; read until writing succeeds
inc hl
inc de
djnz byte_program_loop
flash_lock:
xor a ; slot page = 0
out (#SLOT_PAGE), a
call sdp
ld a, (#SDP_LOCK)
pop hl
ld a, h
out (#SLOT_DEVICE), a
ld a, l
out (#SLOT_PAGE), a
pop hl
pop de
pop bc
ret