[ บทความ : ตัวอย่างสำหรับ AVR ตอนที่ 5 ] ทดสอบ 72 I/O Port ของ ET-AVR V1/2 และ CP-jrAVR

ตัวอย่างซอร์สโค้ดสำหรับติดต่อกับ 72 I/O Port ของบอร์ด ET-AVR V1/2 และ CP-jrAVR เป็นดังนี้

;*************************************************************************** ;* A P P L I C A T I O N N O T E F O R T H E A V R F A M I L Y * ;* ;* Number : ET-AVR V1/V2 ;* File Name :"p72io.asm" ;* Title :read analog to digital ;* Date :6/1/42 ;* Version :1.0 ;* Support telephone :712 1120-1 (ETT) ;* Support fax :3917216 (ETT) ;* Support www :www.etteam.com,www.ett.co.th ;* Target MCU :AT90S8535/AT90LS8535 ;* ;*************************************************************************** ; .include "8535def.inc" .org $0000 rjmp RESET ;Reset Handle ;**************************************************************************** ;* ;* Test/Example Program ;* ;**************************************************************************** ; .def temp = r19 ; RESET: ldi temp,low(RAMEND) out SPL,temp ;init Stack Pointer Low ldi temp,high(RAMEND) out SPL+1,temp ;init Stack Pointer High cli ;clear golbal interrupt ldi r17,0xff ;set port b,c,d as output out DDRB,r17 out DDRC,r17 out DDRD,r17 loop1: ldi r17,0b10101010 out PORTB,r17 out PORTC,r17 out PORTD,r17 rcall delay rcall delay rcall delay ldi r17,0b01010101 out PORTB,r17 out PORTC,r17 out PORTD,r17 rcall delay rcall delay rcall delay rjmp loop1 ;************************* ;* delay program * ;************************* delay: ldi r22,0x04 dly1: ldi r23,0x0ff dly2: ldi r24,0x0ff dly3: dec r24 brne dly3 dec r23 brne dly2 dec r22 brne dly1 ret

;*************************************************************************** ;* A P P L I C A T I O N N O T E F O R T H E A V R F A M I L Y * ;* * ;* Number : CP-jrAVR * ;* File Name :"p72io.asm" * ;* Title :read analog to digital * ;* Date :25/02/43 * ;* Version :1.0 * ;* Support telephone :712 1120-1 (ETT) * ;* Support fax :3917216 (ETT) * ;* Support www :www.etteam.com, www.ett.co.th * ;* Target MCU :AT90S2313/AT90LS2313 * ;* * ;*************************************************************************** ; .include "2313def.inc" .org $0000 rjmp RESET ;Reset Handle .def temp = r19 RESET: ldi temp,low(RAMEND) out SPL,temp ;init Stack Pointer Low ldi temp,high(RAMEND) out SPL+1,temp ;init Stack Pointer High ldi r17,0xff ;set port b,c,d as output out DDRB,r17 out DDRD,r17 loop: ldi r17,0b00000001 clc loop1: out PORTB,r17 out PORTD,r17 rcall delay rol r17 rjmp loop1 ;********************************** ;* delay program * ;********************************** delay: ldi r22,0x10 dly1: ldi r23,0x0ff dly2: ldi r24,0x0ff dly3: dec r24 brne dly3 dec r23 brne dly2 dec r22 brne dly1 ret

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