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sms/kbd: still advancing on ps2ctl 

next step: implement ST.
This commit is contained in:
Virgil Dupras 2020-05-18 20:55:10 -04:00
parent e0bc14e55c
commit 6a55a04f22
1 changed files with 19 additions and 0 deletions
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19
recipes/sms/kbd/ps2ctl.fs
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@ -50,6 +50,8 @@ Z: pointer to the next scan code to push to the 595 )
0 CONSTANT LQ
4 CONSTANT LR
0x100-100 CONSTANT TIMER_INITVAL
( We need a lot of labels in this program... )
VARIABLE L5 VARIABLE L6 VARIABLE L7 VARIABLE L8
H@ ORG !
L1 FLBL, ( main )
@ -114,3 +116,20 @@ L2 ' BRTS FLBL! ( processbit )
19 0x1 ANDI, ( only keep the first flag )
GPIOR0 0 CBI,
CLT, ( ready to receive another bit )
( We've received a bit. reset timer )
L2 FLBL, ( RCALL resetTimer )
( Which step are we at? )
18 TST,
L5 FLBL, ( BREQ processbits0 )
18 1 CPI,
L6 FLBL, ( BREQ processbits1 )
18 2 CPI,
L7 FLBL, ( BREQ processbits2 )
( step 3: stop bit )
18 CLR, ( happens in all cases )
( DATA has to be set )
19 TST, ( was DATA set? )
L1 ' BREQ FLBL! ( loop, not set? error, don't push to buf )
( push r17 to the buffer )