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⇱ avrでシリアル #アセンブラ - Qiita

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@ohisama@github

avrでシリアル

2
Last updated at Posted at 2018-02-27

概要

avrでシリアルやってみた。
attiny85でアセンブラで書いた。

環境

avr studio 4
attiny85 1mhz
tera term
usb-serial

回路図

👁 image

サンプルコード

9600ボーで「U」を送る。

;software 232c send
.include "tn85def.inc"
.cseg
.org 	0

reset:
	rjmp	setup
	reti
	reti
	reti
	reti
	reti
	reti
	reti
	reti
	reti
	reti
	reti
	reti
	reti
	reti

wait:
	clr 	r0
	ldi 	r17, 4
wait1:
	dec 	r0
	brne	wait1
	dec 	r17
	brne	wait1
	ret

wait100:
	ldi 	r17, 28
	subi	r17, 1
	brcc	PC - 1
	dec 	r18
	ret

setup:
	ldi 	r16, high(RAMEND)
	out 	SPH, r16
	ldi 	r16, low(RAMEND)
	out 	SPL, r16
	sbi 	DDRB, PB1
	sbi 	PORTB, PB1
send_loop:
	cbi		PORTB, PB1 	;start
	rcall wait100
	sbi		PORTB, PB1	;bit0
	rcall wait100
	cbi		PORTB, PB1	;bit1
	rcall wait100
	sbi		PORTB, PB1	;bit2
	rcall wait100
	cbi		PORTB, PB1	;bit3
	rcall wait100
	sbi		PORTB, PB1	;bit4
	rcall wait100
	cbi		PORTB, PB1	;bit5
	rcall wait100
	sbi		PORTB, PB1	;bit6
	rcall wait100
	cbi		PORTB, PB1	;bit7
	rcall wait100
	cbi		PORTB, PB1	;stop
	rcall wait100
	sbi		PORTB, PB1
	rcall wait
	rjmp	send_loop

結果

👁 image

以上。

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