mirror of
https://github.com/QB64-Phoenix-Edition/QB64pe.git
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6e01fc8dce
Added new _STRCMP and _STRICMP commands for quick string comparisons. Cleaned up QB64 to finish removing the QUI (quick user insert) code and folders. Altered UCASE and LCASE routines to be faster in some situations for us.
31 lines
1.2 KiB
Plaintext
31 lines
1.2 KiB
Plaintext
The {{KW|WAIT}} statement waits until the value read from an I/O port has certain bits set.
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{{PageSyntax}}
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:{{KW|WAIT}} {{Parameter|port%}}, {{Parameter|andMask%}}[, {{Parameter|xorMask%}}]
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{{PageDescription}}
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* The {{KW|WAIT}} statement reads a value from {{Parameter|port%}} using {{KW|INP}}.
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* If {{Parameter|xorMask%}} is specified, the value is {{KW|XOR}}'d with {{Parameter|xorMask%}}. It has the effect of "toggle these bits".
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* The value is then {{KW|AND}}'d with {{Parameter|andMask%}}. It has the effect of "check if these bits are set".
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* If the final value is non-zero, {{KW|WAIT}} returns. Otherwise, another value is read from {{Parameter|port%}} and checked again.
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* The {{KW|WAIT}} statement returns immediately if {{Parameter|port%}} is not supported.
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{{PageExamples}}
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:Waiting for vertical retrace
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{{CodeStart}}' Either statement can be used to try to reduce screen flickering.
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' If both statements are used, try changing the order.
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WAIT &H3DA, 8 ' finishes whenever the screen isn't being written to
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WAIT &H3DA, 8, 8 ' finishes whenever the screen is being written to
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{{CodeEnd}}
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{{PageSeeAlso}}
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* {{KW|INP}}, {{KW|OUT}}
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* [[Scancodes]]
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{{PageNavigation}} |