9bbfce23e2
This only includes the method to set the pairs of displays individually. The functions to write a single 16 or 32 bit value have not been implemented yet, nor has the mask function.
39 lines
669 B
ArmAsm
39 lines
669 B
ArmAsm
.include "io.inc65"
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.export _hex_set_8
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.export _hex_set_16
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.export _hex_set_24
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.export _hex_enable
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.autoimport on
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.code
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; @in A: idx Stack[0]: val
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; @out A: 0 for success, 1 for failure.
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; Sets one of the 3 pairs of hex digits.
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_hex_set_8:
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phx
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cmp #$3 ; If idx >= 3 then fail
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bcc @1
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lda #$1
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rts
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@1: tax ; Move idx into x
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jsr popa ; put val into a
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sta SEVEN_SEG,x ; write to val
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lda #$0
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plx
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rts
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_hex_set_16:
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lda #$1
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rts
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_hex_set_24:
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lda #$1
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rts
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; @in A: mask
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; Set the mask for seven seg enables
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_hex_enable:
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rts |