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avra: add CBI and SBI

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This completes instruction support for the Blink tn45 example.
This commit is contained in:
Virgil Dupras 2019-12-15 20:51:31 -05:00
parent 5c43988649
commit c968995ec0
3 changed files with 46 additions and 25 deletions
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61
apps/zasm/avr.asm
View File

@ -103,6 +103,9 @@ instrNames:
.equ I_RCALL 84
.db "RCALL", 0
.db "RJMP", 0
.equ I_CBI 86
.db "CBI", 0
.db "SBI", 0
.db 0xff
; Instruction table
@ -200,6 +203,9 @@ instrTbl:
; k(12): XXXXkkkk kkkkkkkk
.db 0x08, 0b11010000, 0x00 ; RCALL k
.db 0x08, 0b11000000, 0x00 ; RJMP k
; A(5) + bit: XXXXXXXX AAAAAbbb
.db 0x09, 0b10011000, 0x00 ; CBI A, b
.db 0x09, 0b10011010, 0x00 ; SBI A, b
; Same signature as getInstID in instr.asm
; Reads string in (HL) and returns the corresponding ID (I_*) in A. Sets Z if
@ -289,7 +295,14 @@ parseInstruction:
jr c, .spitRegular
cp I_RCALL
jr c, .spitRdK8
jr .spitk12
cp I_CBI
jr c, .spitk12
; spit A(5) + bit
ld a, h
rla \ rla \ rla
or l
ld c, a
jr .spit
.spitRegular:
; Regular process which places H and L, ORring it with upcode. Works
; in most cases.
@ -454,6 +467,7 @@ argSpecs:
.db 'b', 7 ; bit + k(7)
.db 'R', 'A' ; Rd(5) + A(6)
.db 'D', 0 ; K(12)
.db 'a', 'b' ; A(5) + bit
; Parse arguments from I/O according to specs in HL
; H for first spec, L for second spec
@ -506,6 +520,8 @@ _parseArgs:
jr z, _readBit
cp 'A'
jr z, _readA6
cp 'a'
jr z, _readA5
cp 7
jr z, _readk7
cp 8
@ -514,31 +530,17 @@ _parseArgs:
jr z, _readDouble
ret ; something's wrong
; Read expr and return success only if result in under number given in A
; Z for success
_readExpr:
push ix
push bc
ld b, a
call parseExpr
jr nz, .end
ld a, b
call _IX2A
jr nz, .end
or c
ld c, a
cp a ; ensure Z
.end:
pop bc
pop ix
ret
_readBit:
ld a, 7
jr _readExpr
_readA6:
ld a, 0x3f
jr _readExpr
_readA5:
ld a, 0x1f
jr _readExpr
_readK8:
ld a, 0xff
@ -632,4 +634,23 @@ _IX2A:
; Z set from "or a"
ret
; Read expr and return success only if result in under number given in A
; Z for success
_readExpr:
push ix
push bc
ld b, a
call parseExpr
jr nz, .end
ld a, b
call _IX2A
jr nz, .end
or c
ld c, a
cp a ; ensure Z
.end:
pop bc
pop ix
ret

8
tools/tests/avra/blink_tn45.asm
View File

@ -14,8 +14,8 @@ main:
ldi r16, RAMEND}8
out SPH, r16
;sbi DDRB, 0
;cbi PORTB, 0
sbi DDRB, 0
cbi PORTB, 0
; To have a blinking delay that's visible, we have to prescale a lot.
; The maximum prescaler is 1024, which makes our TCNT0 increase
@ -37,7 +37,7 @@ toggle:
ldi r16, 0b00000010 ; TOV0
out TIFR, R16
inc r1
;cbi PORTB, 0
cbi PORTB, 0
sbrs r1, 1 ; if LED is on
;sbi PORTB, 0
sbi PORTB, 0
ret

2
tools/tests/avra/blink_tn45.expected
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@ -1 +1 @@
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