90 lines
2.0 KiB
ArmAsm
90 lines
2.0 KiB
ArmAsm
;;; SET.TIME utility for The Cricket!
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;;; Prompts for time and sends Cricket "Set Time" sequence.
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.setcpu "6502"
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.linecont +
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.feature string_escapes
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.include "apple2.inc"
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.include "apple2.mac"
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.include "../../inc/apple2.inc"
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.include "../../inc/macros.inc"
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.include "../../inc/ascii.inc"
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.org $2000
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.proc main
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jsr zstrout
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scrcode "\rTime: HH:MM:SS XM\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08"
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.byte 0
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jsr GETLN2
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;; Configure SSC
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lda #%00001011 ; no parity/echo/interrupts, RTS low, DTR low
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sta COMMAND
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lda #%10011110 ; 9600 baud, 8 data bits, 2 stop bits
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sta CONTROL
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;; Clock Commands
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;; Set Time "ST HH:MM:SS:XM"
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lda #HI('S')
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jsr sendbyte
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lda #HI('T')
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jsr sendbyte
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lda #HI(' ')
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jsr sendbyte
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ldx #0
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loop: lda INPUT_BUFFER,x
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jsr sendbyte
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inx
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cmp #HI(ASCII_CR)
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bne loop
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rts
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.endproc
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;; Write byte in A to SSC
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.proc sendbyte
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pha
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: lda STATUS
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and #(1 << 4) ; transmit register empty? (bit 4)
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beq :- ; nope, keep waiting
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pla
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sta TDREG
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rts
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.endproc
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;;; ------------------------------------------------------------
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;;; Output a high-ascii, null-terminated string.
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;;; String immediately follows the JSR.
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.proc zstrout
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ptr := $A5
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pla ; read address from stack
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sta ptr
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pla
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sta ptr+1
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bne skip ; always (since data not on ZP)
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next: jsr COUT
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skip: inc ptr
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bne :+
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inc ptr+1
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: ldy #0
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lda (ptr),y
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bne next
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lda ptr+1 ; restore address to stack
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pha
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lda ptr
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pha
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rts
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.endproc
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;;; ------------------------------------------------------------
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