;
; state kept
; E current entry
-; A current address
+; R current address for reading (Al = low byte; Ah = high_nybble)
+; S current address for setting (Bl = low byte; Ah = high_nybble)
+; T top address nybble for next address set
+; B bitmask for bit operations
+; F flags: flag name weight in FT
+; printset 0x80 print every value we write into *S
;
-; prompt is `>'
+; prompt is NL CR > SPC initially, then SPC after each command
;
; data entry
-; 0-9a-f hex digit E := E<<4 | (digit value)
+; 0-9a-f hex digit E := (E & 0x0f)<<4 | (digit value)
+; = confirm value print "=", E
+; & set bitmask B := E; print "&", B
+;
+; address operations
+; . set setting address (low byte) S := TE; print R, ",", S
+; , set reading address (low byte) R := TE; print R, ",", S
+; ' set top address nybble T := E & 0x0f
+; ` set flags F := E; print "`", F
+; @ confirm addresses and bitmask print R, ",", S, "&", B
+; ~ confirm flags and high nybble print "`", F, "'", T
;
; byte operations
-; CR enter address A := E
-; = confirm value print E
-; @ confirm address print A
-; ? read and display print *A
-; ! set whole byte *A := E
+; SPC read and display print *R
+; RET, NL set whole byte printset "S", (*S := E)
+; TAB read from setting address print "s", *S
+;
; bitwise operations
-; SPC read and mask print (*A & E)
-; + bitwise or (set bits) *A := *A | E
-; - bitwise and-not (clear bits) *A := *A & ~E
-; ^ bitwise xor (toggle bits) *A := *A ^ E
+; ? read and mask print "?", (*R & B)
+; _ read and mask from setting addr printset "_", (*S & B)
+; + bitwise or (set bits) printset "+", (*S := *S | B)
+; - bitwise and-not (clear bits) printset "-", (*S := *S & ~B)
+; ^ bitwise xor (toggle bits) printset "^", (*S := *S ^ B)
+;
+; `printset' means print if `printset' flag is set, otherwise just evaluate
+ nolist
include /usr/share/gputils/header/p18f458.inc
include insn-aliases.inc
+; list
radix dec
-e equ 0x70
-a equ FSR1L
-star_a equ INDF1
-hex_temp equ 0x72
+;------------------------------------------------------------
+; variable declarations and RAM memory map
+
+r equ FSR0L
+rh equ FSR0H
+star_r equ INDF0
+
+s equ FSR1L
+sh equ FSR1H
+star_s equ INDF1
+
+perpicled_bit equ 2
+
+e equ 0x30
+t equ 0x31
+b equ 0x32
+f equ 0x33
+
+hex_temp equ 0x38
+original_op equ 0x39
+value_temp equ 0x3a
+
+f_printset_bit equ 7
+
+test_loc_a5 equ 0x40
+test_loc_5a equ 0x42
+
+;----------------------------------------
+serial_literal macro char
+; transmits char through the serial port
+; W undefined undefined
+ mov_lw char
+ rcall serial_write_char
+ endm
code
start
rcall led_green
rcall serial_setup
- set_f FSR1H
+
+ clr_f e
+ mov_lw 0x80 ; PORTA
+ mov_wf r
+ set_f rh
+ mov_wf s
+ set_f sh
+ set_f t
+ mov_lw (1<<f_printset_bit)
+ mov_wf f
+
+ mov_lw 0x5a
+ mov_wf test_loc_5a
+ mov_lw 0xa5
+ mov_wf test_loc_a5
+
+ serial_literal 10
+ serial_literal 13
+ serial_literal '>'
+
command_loop
- mov_lw '>'
- rcall serial_write_char
+ serial_literal ' '
rcall serial_read_char
+ mov_wf original_op
+
check_last set 0
checkequal macro value, label
add_lw check_last-value
check_last set minvalue
endm
- checkequal 10, command_return
- checkequal 13, command_return
- checkequal '=', command_confirm_entry
- checkequal '@', command_confirm_address
- checkequal '?', command_byte_read
- checkequal '!', command_byte_write
- checkequal ' ', command_bitwise_read_mask
- checkequal '+', command_bitwise_or
- checkequal '-', command_bitwise_and_not
- checkequal '^', command_bitwise_xor
+ ; data entry
+ checkequal '=', command_byte_confirm
+ checkequal '&', command_byte_bitmask_set
+ ; address operations
+ checkequal '.', command_address_set_setting
+ checkequal ',', command_address_set_reading
+ checkequal 39, command_address_set_high
+ checkequal '`', command_flags_set
+ checkequal '@', command_address_confirm
+ checkequal '~', command_confirm_flags_highnyb
+ ; byte operations
+ checkequal ' ', command_byte_read
+ checkequal 10, command_byte_set
+ checkequal 13, command_byte_set
+ checkequal 9, command_byte_read_fromset
+ ; bit operations
+ checkequal '?', command_bitwise_read_mask
+ checkequal '_', command_bitwise_read_mask_fromset
+ checkequal '+', command_bitwise_or
+ checkequal '-', command_bitwise_and_not
+ checkequal '^', command_bitwise_xor
checkatleast 'f'+1, command_wrong
checkatleast 'a', command_letterhexdigit
command_endswitch
bra command_loop
+;--------------------
+; command digits
+
command_letterhexdigit
add_lw 10
command_digit
mov_wf e
bra command_loop
+;--------------------
+; common routines for command loop
+
+command_endswitch_set
+ mov_wf star_s
+ bt_f_if0 f, f_printset_bit
+ bra command_endswitch_set_ifnot_print
+ mov_wf value_temp
+ mov_fw original_op
+ rcall serial_write_char
+ mov_fw value_temp
command_endswitch_phex
rcall serial_write_hex
+command_endswitch_set_ifnot_print
bra command_endswitch
-command_return
- mov_ff a,e
+;--------------------
+; address commands
+
+command_address_set_setting
+ mov_ff t,sh
+ mov_ff e,s
+ bra command_address_confirm
+
+command_address_set_reading
+ mov_ff t,rh
+ mov_ff e,r
+ bra command_address_confirm
+
+command_address_set_high
+ mov_ff e,t
+ bra command_endswitch
+
+command_flags_set
+ mov_ff e,f
+ rcall confirm_flags
bra command_endswitch
-command_confirm_entry
+command_address_confirm
+ rcall confirm_address
+ rcall confirm_bitmask
+ bra command_endswitch
+
+;----------
+confirm_address
+; prints R, ",", S
+; W undefined undefined
+; hex_temp undefined undefined
+ mov_fw rh
+ rcall serial_write_hex_digit
+ mov_fw r
+ rcall serial_write_hex
+ mov_lw ','
+ rcall serial_write_char
+ mov_fw sh
+ rcall serial_write_hex_digit
+ mov_fw s
+ rcall serial_write_hex
+ bra command_endswitch
+
+command_confirm_flags_highnyb
+ rcall confirm_flags
+ serial_literal 39
+ mov_fw t
+ rcall serial_write_hex_digit
+ bra command_endswitch
+
+;----------
+confirm_bitmask
+; prints "&", B
+; W undefined undefined
+; hex_temp undefined undefined
+ serial_literal '&'
+ mov_fw b
+ rcall serial_write_hex
+ return
+
+;----------
+confirm_flags
+; prints "`", F
+; W undefined undefined
+; hex_temp undefined undefined
+ serial_literal '`'
+ mov_fw f
+ rcall serial_write_hex
+ return
+
+;--------------------
+; byte operations
+
+command_byte_confirm
+ serial_literal '='
mov_fw e
bra command_endswitch_phex
-command_confirm_address
- mov_fw a
- bra command_endswitch_phex
+command_byte_bitmask_set
+ mov_ff e, b
+ rcall confirm_bitmask
+ bra command_endswitch
command_byte_read
- mov_fw star_a
+ mov_fw star_r
bra command_endswitch_phex
-command_byte_write
+command_byte_set
+ mov_lw 'S'
+ mov_wf original_op
mov_fw e
- mov_wf star_a
- bra command_endswitch
+ bra command_endswitch_set
+
+command_byte_read_fromset
+ serial_literal 's'
+ mov_fw star_s
+ bra command_endswitch_phex
+
+;--------------------
+; bit operations
command_bitwise_read_mask
+ serial_literal '?'
mov_fw e
- and_wfw star_a
+ and_wfw star_r
+ bra command_endswitch_phex
+
+command_bitwise_read_mask_fromset
+ serial_literal '_'
+ mov_fw e
+ and_wfw star_s
bra command_endswitch_phex
command_bitwise_or
mov_fw e
- ior_wff star_a
- bra command_endswitch
+ ior_wfw star_s
+ bra command_endswitch_set
command_bitwise_xor
mov_fw e
- xor_wff star_a
- bra command_endswitch
+ xor_wfw star_s
+ bra command_endswitch_set
command_bitwise_and_not
mov_fw e
com_w
- and_wff e
- bra command_endswitch
+ and_wfw star_s
+ bra command_endswitch_set
;----------------------------------------
led_green
- bc_f TRISD, 2 ; enable per-pic led output
- bs_f LATD, 2 ; set per-pic led output
+ bc_f TRISD, perpicled_bit
+ bs_f LATD, perpicled_bit
return
serial_setup
; W undefined undefined
; TXSTA undefined }
- mov_lw 0x26 ; asynch xmit enabled, high baud rate, 8-bit,
- mov_wf TXSTA ;
- mov_lw 129 ; 9600bps (with BRGH)
- mov_wf SPBRG
+ mov_lw (1<<TXEN) | (1<<BRGH) | (1<<TRMT)
+ mov_wf TXSTA ; asynch xmit enabled, high baud rate, 8-bit,
+ mov_lw 129
+ mov_wf SPBRG ; 9600bps (with BRGH)
serial_receive_reset ;from serial_read_if_error
- mov_lw 0x90 ; enable serial port, continuous rx, 8-bit,
- mov_wf RCSTA ; no pending errors etc.
+ mov_lw (1<<SPEN) | (1<<CREN)
+ mov_wf RCSTA ; enable serial port, continuous rx, 8-bit
return
;----------------------------------------
serial_write_char
; W character undefined
serial_write_char_loop
- bt_f_if0 PIR1,TXIF
+ bt_f_if0 PIR1, TXIF
bra serial_write_char_loop
mov_wf TXREG
return
; on errors, sets LED red and transmits *
; W undefined character read
serial_read_char_loop
- bt_f_if0 PIR1,RCIF
+ bt_f_if0 PIR1, RCIF
bra serial_read_char_loop
mov_fw RCSTA
- and_lw CREN | FERR | OERR
- xor_lw CREN
+ and_lw (1<<CREN) | (1<<FERR) | (1<<OERR)
+ xor_lw (1<<CREN)
bra_nz serial_read_if_error
mov_fw RCREG
return
; W value undefined
; hex_temp undefined undefined
mov_wf hex_temp
- rcall serial_write_hex_digit
- rcall serial_write_hex_digit
+ rcall serial_write_hex_1digit_for_both
+ rcall serial_write_hex_1digit_for_both
return
;--------------------
-serial_write_hex_digit
+serial_write_hex_1digit_for_both
; transmits top nybble of hex_temp in hex
; through serial port, as above, and swaps nybbles
; Before After
; hex_temp BBBBaaaa aaaaBBBB (BBBB was sent)
swap_f hex_temp
mov_fw hex_temp
+;...
+;--------------------
+serial_write_hex_digit
+; transmits bottom nybble of W in hex
+; W ????VVVV undefined
and_lw 0x0f
sub_lw 10
sub_lw 0
add_lw 'a'-('0'+10)
serial_write_hex_digit_ifnot_ge10
add_lw '0'+10
- rcall serial_write_char
-
- end
-
-
- end
-
- add_lw -13
- bra_z
- ; '2' '0'-1 '9'+1
- add_lw -('9'+1) ; 256-C 256-11 0C
- bra_c command_ifgtdecdigit
- add_lw ('9'+1)-('0') ; 2
- bra_nc command_ifltdecdigit
-
-
- bcf TRISC, 6, 0 ; enable TXD output (RC6)
-
-
-
- bcf TRISC, 5, 0 ; enable FCO output (RC5)
-
-
-loop
-
- ; set a bit which says how fast the led
- ; should flash and count down from 2^(that bit)
- bsf COUNTOUTER, OUTEREXP, 0
-delayouter_loop
-
-delayinner_loop
- copybit PORTB, 3, LATA, 0x08 ; A data
- copybiti PORTD, 7, TRISA, 0x08 ; A enable
- copybiti PORTA, 6, LATD, 0x10 ; D
- copybit PORTB, 4, LATC, 0x20 ; serial FC
- copybit PORTC, 7, LATC, 0x40 ; serial data
- ; 6 x copybit @6 = 24cy
-
- decfsz COUNTINNER, 1, 0 ; 1 cycle
- goto delayinner_loop ; 2 cycles (skipped or not)
-; exited delayinner_loop ; total: 27cy * 256 = 6912cy
-
- ; each cycle 0.2us
- ; so each inner loop is ~1.4ms
-
- decfsz COUNTOUTER, 1, 0
- goto delayouter_loop
-; exited delayouter_loop
-
- goto loop
+ bra serial_write_char
end
~ijackson / trains.git / commitdiff