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7d568bd782
Add _TRA!, _THA!, _TRB!, _THB! routines to easily handle those pins' value without stepping on other pins like the drivers previously did. For SDC driver, it's going to be important soon because it turns out that I can't get away with "always on" CS, so I'll need a scheme where it's important that TH/TR pins have stable values.
13 lines
453 B
Plaintext
13 lines
453 B
Plaintext
CODE _TRB! HL POP, chkPS, ( B0 -> B6, B1 -> B2 )
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L RR, RLA, RLA, RLA, RLA, L RR, RLA, RLA, RLA,
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0x44 ANDi, L A LDrr, CPORT_CTL INAi,
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0xbb ANDi, L ORr, CPORT_CTL OUTiA,
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;CODE
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CODE _THB! HL POP, chkPS, ( B0 -> B7, B1 -> B3 )
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L RR, RLA, RLA, RLA, RLA, L RR, RLA, RLA, RLA, RLA,
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0x88 ANDi, L A LDrr, CPORT_CTL INAi,
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0x77 ANDi, L ORr, CPORT_CTL OUTiA,
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;CODE
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CODE _D1@ CPORT_D1 INAi, PUSHA, ;CODE
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CODE _D2@ CPORT_D2 INAi, PUSHA, ;CODE
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