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acia: make GetC blocking

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This commit is contained in:
Virgil Dupras 2019-11-04 14:44:43 -05:00
parent f395297874
commit 3ef964e74d
1 changed files with 4 additions and 10 deletions
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14
kernel/acia.asm
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@ -98,17 +98,17 @@ aciaInt:
reti reti
; *** BLOCKDEV *** ; *** STDIO ***
; These function below follow the blockdev API. ; These function below follow the stdio API.
aciaGetC: aciaGetC:
push de push de
.loop:
ld a, (ACIA_BUFWRIDX) ld a, (ACIA_BUFWRIDX)
ld e, a ld e, a
ld a, (ACIA_BUFRDIDX) ld a, (ACIA_BUFRDIDX)
cp e cp e
jr z, .nothingToRead ; equal? nothing to read. jr z, .loop ; equal? nothing to read. loop
; Alrighty, buffer not empty. let's read. ; Alrighty, buffer not empty. let's read.
ld de, ACIA_BUF ld de, ACIA_BUF
@ -120,12 +120,6 @@ aciaGetC:
; And finally, fetch the value. ; And finally, fetch the value.
ld a, (de) ld a, (de)
cp a ; ensure Z
jr .end
.nothingToRead:
call unsetZ
.end:
pop de pop de
ret ret