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app_macros.inc
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app_macros.inc
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;;
; Copyright Jacques Deschênes 2019
; This file is part of STM8_NUCLEO
;
; STM8_NUCLEO is free software: you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation, either version 3 of the License, or
; (at your option) any later version.
;
; STM8_NUCLEO is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with STM8_NUCLEO. If not, see <http://www.gnu.org/licenses/>.
;;
;--------------------------------------
TAB_WIDTH=4 ; default tabulation width
EOF=0xff ; end of file marker
NLEN_MASK=0xf ; mask to extract name len
STACK_EMPTY=RAM_SIZE-1
; boolean bit in 'flags' variable
FRUN=0 ; program running
FOPT=1 ; run time optimization flag
FSLEEP=3 ; halt resulting from SLEEP
FSTOP=4 ; STOP command flag
FCOMP=5 ; compiling flags
FAUTO=6 ; auto line numbering .
FTRACE=7 ; trace flag
LINE_HEADER_SIZE=3 ; line number 2 bytes and line length 1 byte
FIRST_DATA_ITEM=LINE_HEADER_SIZE+1 ; skip over DATA_IDX token.
MAX_LINENO=0x7fff; BASIC maximum line number
RX_QUEUE_SIZE=8
TIM2_CLK_FREQ=62500
ADR_SIZE=2 ; bytes
NAME_SIZE=2 ; bytes
STDOUT=1 ; output to uart
BUFOUT=3 ; buffered output
TOS=1 ; offset of top of stack parameter on stack
TYPE_MASK=0xf0 ; mask to extract data type, i.e. DIM variable symbol or CONST symbol
TYPE_DVAR=(1<<4); DIM variable type
TYPE_CONST=(2<<4); CONST data
NLEN_MASK=0xf ; mask to extract name len
NONE_IDX = 255 ; not a token
;--------------------------------------
; assembler flags
;-------------------------------------
; MATH_OVF=0 ; if 1 the stop on math overflow
; assume 16 Mhz Fcpu
.macro _usec_dly n
ldw x,#(16*n-2)/4 ; 2 cy
decw x ; 1 cy
nop ; 1 cy
jrne .-2 ; 2 cy
.endm
; load X register with
; entry point of dictionary
; before calling 'search_dict'
.macro _ldx_dict dict_name
ldw x,#dict_name+2
.endm
; reset BASIC pointer
; to beginning of last token
; extracted except if it was end of line
.macro _unget_token
decw y
.endm
; extract 16 bits address from BASIC code
.macro _get_addr
ldw x,y ; 1 cy
ldw x,(x) ; 2 cy
addw y,#2 ; 2 cy
.endm ; 5 cy
; alias for _get_addr
.macro _get_word
_get_addr
.endm ; 5 cy
; extract character from BASIC code
.macro _get_char
ld a,(y) ; 1 cy
incw y ; 1 cy
.endm ; 2 cy
; extract next token
.macro _next_token
_get_char
.endm ; 2 cy
; extract next command token id
.macro _next_cmd
_get_char ; 2 cy
.endm ; 2 cy
; get code address in x
.macro _code_addr
clrw x ; 1 cy
ld xl,a ; 1 cy
sllw x ; 2 cy
ldw x,(code_addr,x) ; 2 cy
.endm ; 6 cy
; call subroutine from index in a
.macro _call_code
_code_addr ; 6 cy
call (x) ; 4 cy
.endm ; 10 cy
; jump to bytecode routine
; routine must jump back to
; interp_loop
.macro _jp_code
_code_addr
jp (x)
.endm ; 8 cycles
; jump back to interp_loop
.macro _next
jp interp_loop
.endm ; 2 cycles
;------------------------------------
; board user LED control macros
;------------------------------------
.macro _led_on
bset LED_PORT,#LED_BIT
.endm
.macro _led_off
bres LED_PORT,#LED_BIT
.endm
.macro _led_toggle
bcpl LED_PORT,#LED_BIT
.endm
;------------------------------------
; BASIC pending_stack macros
;-------------------------------------
; reset pending stack
.macro _rst_pending
ldw x,#pending_stack+PENDING_STACK_SIZE
_strxz psp
.endm
; fetch TOS
.macro _last_pending
ld a,[psp]
.endm
; push operation token
; input:
; A token
.macro _push_op
_decz psp+1
ld [psp],a
.endm
; pop pending operation
; output:
; A token
.macro _pop_op
ld a,[psp]
_incz psp+1
.endm
; check for stack full
; output:
; A ==0 -> stack full
.macro _pending_full
ld a,#pending_stack
sub a,psp+1
.endm
; check for stack_empty
; output:
; A == 0 -> stack empty
.macro _pending_empty
_ldaz psp+1
sub a,#pending_stack+PENDING_STACK_SIZE
.endm
; compare a with last pushed op
.macro _cp_op
cp a,[psp]
.endm
; drop last pushed op
.macro _drop_op
_incz psp+1
.endm