[ บทความ : ตัวอย่างสำหรับ AVR ตอนที่ 6 ] ทดสอบ Timer ของ ET-AVR V1/2

ตัวอย่างซอร์สโค้ดสำหรับติดต่อกับ TIMER ของบอร์ด ET-AVR V1/2 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		:"timer0.asm"
;* Title		:rs232 echo
;* 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   $000 
             rjmp  RESET	        ;Reset Handle

            .org   $009                 ;Timer0 overflow Handle
             rjmp  TIM0_OVF

;****************************************************************************
;*
;* 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

            sei                         ;set golbal interrupt
            ldi     temp,0b00000001     ;set timer0 interrupt
            out     TIMSK,temp  
                          
            ldi     temp,0xFF           ;set PORTD.1 output port 
            out     DDRB,temp
                      
            ldi     temp,0x00            
            out     TCNT0,temp          ;initial value of timer/counter0

            ldi     temp,0b00000101     ;set set prescale and start timer/counter0
            out     TCCR0,temp     
            
            ldi     temp,0xFF
loop:       rjmp    loop
                    

TIM0_OVF:   com     temp
            out     PORTB,temp 
            reti






;***************************************************************************
;* 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		:"timer20v.asm"
;* Title		:rs232 echo
;* 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    $000 
             rjmp   RESET	         ;Reset Handle

            .org    $004                 ;Timer0 overflow Handle
             rjmp   TIM2_OVF

;****************************************************************************
;*
;* 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

            sei                         ;set golbal interrupt
            ldi     temp,0b01000000     ;set timer2 interrupt
            out     TIMSK,temp  
                          
            ldi     temp,0xFF           ;set PORTC output port 
            out     DDRB,temp
                      
            ldi     temp,0x00            
            out     TCNT2,temp          ;initial value of timer/counter2          

            ldi     temp,0b00000101     ;set set prescale and start timer/counter1
            out     TCCR2,temp     
            
            ldi     temp,0xFF
loop:       rjmp    loop
                    

TIM2_OVF:   com     temp
            out     PORTB,temp 
            reti






;***************************************************************************
;* 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		:"timer10v.asm"
;* Title		:rs232 echo
;* 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    $000 
             rjmp   RESET	         ;Reset Handle

            .org    $008                 ;Timer0 overflow Handle
             rjmp   TIM1_OVF

;****************************************************************************
;*
;* 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

            sei                         ;set golbal interrupt
            ldi     temp,0b00000100     ;set timer1 interrupt
            out     TIMSK,temp  
                          
            ldi     temp,0xFF           ;set PORTD output port 
            out     DDRD,temp
                      
            ldi     temp,0x00            
            out     TCNT1H,temp         ;initial value of timer/counter1 
            out     TCNT1L,temp          

            ldi     temp,0b00000010     ;set set prescale and start timer/counter1
            out     TCCR1B,temp     
            
            ldi     temp,0xFF
loop:       rjmp    loop
                    

TIM1_OVF:   com     temp
            out     PORTD,temp 
            reti

สามารถ download ไฟล์ตัวอย่างของบอร์ด พร้อม assembler ได้เลยครับ

เขียนโดย : ETT
Author : ETT team
e-mail : sales@etteam.com
วันที่ทำการปรับปรุง : ๑๖ พ.ย. ๒๕๔๓