delay.lis

用的avr icc 开发的atmega16的超声波测距仪模型。

                        .module delay.c
                        .area text(rom, con, rel)
 0000                   .dbfile D:\NEW\ECHO\delay.c
 0000                   .dbfunc e ds_delay _ds_delay fV
 0000           ;              n -> R16
                        .even
 0000           _ds_delay::
 0000                   .dbline -1
 0000                   .dbline 5
 0000           ; #define DELAY_C
 0000           ; #include "includes.h"
 0000           ; #define XTAL 4    //晶振频率，单位MHz
 0000           ; void ds_delay(unsigned char n)//speciel delay for ds18b20
 0000           ;   {            //7.3752MHz n=254>>> t=99us 
 0000                   .dbline 6
 0000 01C0              xjmp L5
 0002           L2:
 0002                   .dbline 6
 0002           L3:
 0002                   .dbline 6
 0002 0A95              dec R16
 0004           L5:
 0004                   .dbline 6
 0004           ;    for( ;n!=0;n--);
 0004 0023              tst R16
 0006 E9F7              brne L2
 0008                   .dbline -2
 0008                   .dbline 7
 0008           ;   }
 0008           L1:
 0008                   .dbline 0 ; func end
 0008 0895              ret
 000A                   .dbsym r n 16 c
 000A                   .dbend
 000A                   .dbfunc e delay_1us _delay_1us fV
                        .even
 000A           _delay_1us::
 000A                   .dbline -1
 000A                   .dbline 10
 000A           ;   
 000A           ; void delay_1us(void)                 //1us延时函数
 000A           ;   {
 000A                   .dbline 11
 000A           ;    asm("nop");
 000A 0000              nop
 000C                   .dbline -2
 000C                   .dbline 12
 000C           ;   }
 000C           L6:
 000C                   .dbline 0 ; func end
 000C 0895              ret
 000E                   .dbend
 000E                   .dbfunc e delay_nus _delay_nus fV
 000E           ;              i -> R20,R21
 000E           ;              n -> R22,R23
                        .even
 000E           _delay_nus::
 000E 0E940000          xcall push_gset2
 0012 B801              movw R22,R16
 0014                   .dbline -1
 0014                   .dbline 15
 0014           ; 
 0014           ; void delay_nus(unsigned int n)       //N us延时函数
 0014           ;   {
 0014                   .dbline 16
 0014           ;    unsigned int i=0;
 0014 4427              clr R20
 0016 5527              clr R21
 0018                   .dbline 17
 0018           ;    for (i=0;i<n;i++)
 0018 03C0              xjmp L11
 001A           L8:
 001A                   .dbline 18
 001A F7DF              xcall _delay_1us
 001C           L9:
 001C                   .dbline 17
 001C 4F5F              subi R20,255  ; offset = 1
 001E 5F4F              sbci R21,255
 0020           L11:
 0020                   .dbline 17
 0020 4617              cp R20,R22
 0022 5707              cpc R21,R23
 0024 D0F3              brlo L8
 0026                   .dbline -2
 0026                   .dbline 19
 0026           ;    delay_1us();
 0026           ;   }
 0026           L7:
 0026 0E940000          xcall pop_gset2
 002A                   .dbline 0 ; func end
 002A 0895              ret
 002C                   .dbsym r i 20 i
 002C                   .dbsym r n 22 i
 002C                   .dbend
 002C                   .dbfunc e delay_1ms _delay_1ms fV
 002C           ;              i -> R16,R17
                        .even
 002C           _delay_1ms::
 002C                   .dbline -1
 002C                   .dbline 22
 002C           ;   
 002C           ; void delay_1ms(void)                 //1ms延时函数
 002C           ;   {
 002C                   .dbline 24
 002C 0027              clr R16
 002E 1127              clr R17
 0030 02C0              xjmp L16
 0032           L13:
 0032                   .dbline 24
 0032           L14:
 0032                   .dbline 24
 0032 0F5F              subi R16,255  ; offset = 1
 0034 1F4F              sbci R17,255
 0036           L16:
 0036                   .dbline 24
 0036           ;    unsigned int i;
 0036           ;    for (i=0;i<(unsigned int)(XTAL*143-2);i++);
 0036 0A33              cpi R16,58
 0038 E2E0              ldi R30,2
 003A 1E07              cpc R17,R30
 003C D0F3              brlo L13
 003E                   .dbline -2
 003E                   .dbline 25
 003E           ;   }
 003E           L12:
 003E                   .dbline 0 ; func end
 003E 0895              ret
 0040                   .dbsym r i 16 i
 0040                   .dbend
 0040                   .dbfunc e delay_nms _delay_nms fV
 0040           ;              i -> R20,R21
 0040           ;              n -> R22,R23
                        .even
 0040           _delay_nms::
 0040 0E940000          xcall push_gset2
 0044 B801              movw R22,R16
 0046                   .dbline -1
 0046                   .dbline 28
 0046           ;   
 0046           ; void delay_nms(unsigned int n)       //N ms延时函数
 0046           ;   {
 0046                   .dbline 29
 0046           ;    unsigned int i=0;
 0046 4427              clr R20
 0048 5527              clr R21
 004A                   .dbline 30
 004A           ;    for (i=0;i<n;i++)
 004A 03C0              xjmp L21
 004C           L18:
 004C                   .dbline 31
 004C                   .dbline 32
 004C EFDF              xcall _delay_1ms
 004E                   .dbline 33
 004E           L19:
 004E                   .dbline 30
 004E 4F5F              subi R20,255  ; offset = 1
 0050 5F4F              sbci R21,255
 0052           L21:
 0052                   .dbline 30
 0052 4617              cp R20,R22
 0054 5707              cpc R21,R23
 0056 D0F3              brlo L18
 0058                   .dbline -2
 0058                   .dbline 34
 0058           ;    {
 0058           ;       delay_1ms();
 0058           ;    }   
 0058           ;   }
 0058           L17:
 0058 0E940000          xcall pop_gset2
 005C                   .dbline 0 ; func end
 005C 0895              ret
 005E                   .dbsym r i 20 i
 005E                   .dbsym r n 22 i
 005E                   .dbend