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34 lines
1.1 KiB
NASM
34 lines
1.1 KiB
NASM
; The following program was built and converted into Verilog hex-dump
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; format with the following commands. Your assembler may use slightly
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; different syntax or command-line options.
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;
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; Note that the call to xxd and awk must sit on one line or it won't work.
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;
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; a from example.asm to example.bin
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; xxd -g 8 -c 8 example.bin | \
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; awk -e '{print substr($2,15,2)substr($2,13,2)substr($2,11,2) \
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; substr($2,9,2)substr($2,7,2)substr($2,5,2)substr($2,3,2) \
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; substr($2,1,2);}' >example.hex
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;
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adv $F00, $CC
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jal 1, main ; Call our main program, setting
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; X1 to point at our string.
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byte "Hello world!",13,10,0
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align 4
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main: jal 2, writeStr ; Write the string the console.
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csrrwi 0, 2, $0FF ; End the simulation successfully.
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writeStr: lb 3, 0(1) ; Get next byte to transmit
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beq 3, 0, done ; If we're done, return.
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ori 3, 3, $100 ; Set start bit.
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slli 3, 3, 3 ; Send it via OUTPUT.
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csrrw 0, 3, $0FF
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addi 1, 1, 1 ; Advance to the next byte.
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jal 0, writeStr ; Repeat as often as necessary.
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done: jalr 0, 0(2)
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adv $1000, 0
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