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49 lines
902 B
49 lines
902 B
;
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;=======================================================================
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; HDIAG Z180 UART Driver
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;=======================================================================
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;
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z2u_jptbl:
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jp z2u_cinit ; Initialize serial port
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jp z2u_cin ; Read byte
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jp z2u_cout ; Write byte
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jp z2u_cist ; Input status
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jp z2u_cost ; Output Status
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;
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;
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;
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z2u_cinit:
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; initialize port here
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or $FF ; signal failure for now
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ret
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;
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;
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;
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z2u_cin:
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call z2u_cist ; check for char ready
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jr z,z2u_cin ; if not, loop
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; read byte here
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ret ; done
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;
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;
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;
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z2u_cout:
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push af ; save incoming
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z2u_cout1:
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call z2u_cost ; ready for char?
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jr z,z2u_cout1 ; loop if not
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pop af ; restore incoming
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; write byte here
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ret ; and done
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;
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;
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;
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z2u_cist:
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; check input status here
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ret
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;
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;
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;
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z2u_cost:
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; check output status here
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ret ; a != 0 if char ready, else 0
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