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Fix serial and keyboard input to be non-blocking

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maddiebaka
2026-08-23 20:36:30 -04:00
parent 0b4cb9f0b8
commit cb936d97b8
1 changed files with 11 additions and 5 deletions
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bme280_util.z80
+11 -5
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@@ -45,8 +45,12 @@ start:
call print_str_to_lcd call print_str_to_lcd
main: main:
call read_char_b call read_char_b ; never blocks now
jr nc,check_quit ; wire is idle, go look at the keyboard
call parse_char call parse_char
jr main ; drain the sio while it still has data
check_quit:
ld c,dconio ; direct console i/o, no echo ld c,dconio ; direct console i/o, no echo
ld e,0ffh ; ff polls, returning zero if no key ld e,0ffh ; ff polls, returning zero if no key
call bdos call bdos
@@ -124,13 +128,15 @@ found_point:
ld (hl),00h ; null terminate, discarding the rest ld (hl),00h ; null terminate, discarding the rest
ret ret
read_char_b: read_char_b: ; carry set with the char in a, carry clear if nothing waiting
wait:
in a,(siob_ctrl) in a,(siob_ctrl)
bit 0,a bit 0,a
jr z,wait jr z,no_char
in a,(siob_data) in a,(siob_data)
scf ; flag a as a real character
ret
no_char:
or a ; clears carry, a holds status not data
ret ret
parse_char: ; char should be in register a parse_char: ; char should be in register a