main.lst

一个关于AVR单片机的例程

__start:
__text_start:
    002A E5CF      LDI	R28,0x5F
    002B E0D4      LDI	R29,4
    002C BFCD      OUT	0x3D,R28
    002D BFDE      OUT	0x3E,R29
    002E 51C0      SUBI	R28,0x10
    002F 40D0      SBCI	R29,0
    0030 EA0A      LDI	R16,0xAA
    0031 8308      STD	Y+0,R16
    0032 2400      CLR	R0
    0033 E6E0      LDI	R30,0x60
    0034 E0F0      LDI	R31,0
    0035 E010      LDI	R17,0
    0036 36E0      CPI	R30,0x60
    0037 07F1      CPC	R31,R17
    0038 F011      BEQ	0x003B
    0039 9201      ST	R0,Z+
    003A CFFB      RJMP	0x0036
    003B 8300      STD	Z+0,R16
    003C E5E4      LDI	R30,0x54
    003D E0F0      LDI	R31,0
    003E E6A0      LDI	R26,0x60
    003F E0B0      LDI	R27,0
    0040 E010      LDI	R17,0
    0041 35E4      CPI	R30,0x54
    0042 07F1      CPC	R31,R17
    0043 F021      BEQ	0x0048
    0044 95C8      LPM
    0045 9631      ADIW	R30,1
    0046 920D      ST	R0,X+
    0047 CFF9      RJMP	0x0041
    0048 940E004B  CALL	_main
_exit:
    004A CFFF      RJMP	_exit
FILE: D:\桌面\实验教程\LED应用\红绿灯闪烁2\main.c
(0001) #include <iom8v.h> //和单片机类型相对应的头文件，选择Atmega8做实验；
(0002) #include <macros.h>
(0003) void delay_1ms(void); //函数声明，本实验中会用到这两个函数
(0004) void delay_nms(unsigned int n);
(0005) void main(void) //主函数
(0006) {
(0007) OSCCAL=0X9E;//系统时钟校准，不同的芯片和不同的频率，
_main:
    004B E98E      LDI	R24,0x9E
    004C BF81      OUT	0x31,R24
(0008) DDRB=0B00000011; //定义B口的PB0、PB1为输出口
    004D E083      LDI	R24,3
    004E BB87      OUT	0x17,R24
(0009) PORTB=0B00000001; //PB0口输出高电平，PB1口输出低电平，绿灯亮
    004F E081      LDI	R24,1
    0050 BB88      OUT	0x18,R24
(0010) delay_nms(5000); //延时5秒
    0051 E808      LDI	R16,0x88
    0052 E113      LDI	R17,0x13
    0053 D019      RCALL	_delay_nms
(0011) PORTB=0B00000010; //PB1口输出高电平，PB0口输出低电平，关闭绿灯，红灯亮
    0054 E082      LDI	R24,2
    0055 BB88      OUT	0x18,R24
(0012) delay_nms(5000); //延时5秒
    0056 E808      LDI	R16,0x88
    0057 E113      LDI	R17,0x13
    0058 D014      RCALL	_delay_nms
    0059 C007      RJMP	0x0061
(0013) while(1) //程序一直执行该循环 
(0014) {
(0015)   PORTB^=0B00000011; //翻转PB0和PB1口
    005A E083      LDI	R24,3
    005B B228      IN	R2,0x18
    005C 2628      EOR	R2,R24
    005D BA28      OUT	0x18,R2
(0016)   delay_nms(1000);
    005E EE08      LDI	R16,0xE8
    005F E013      LDI	R17,3
    0060 D00C      RCALL	_delay_nms
    0061 CFF8      RJMP	0x005A
    0062 9508      RET
(0017) }
(0018) }
(0019) void delay_1ms(void)//1ms延时函数
(0020) {
(0021) unsigned int i;
(0022) for (i=0;i<150;i++)
_delay_1ms:
  i                    --> R16
    0063 2700      CLR	R16
    0064 2711      CLR	R17
    0065 C002      RJMP	0x0068
    0066 5F0F      SUBI	R16,0xFF
    0067 4F1F      SBCI	R17,0xFF
    0068 3906      CPI	R16,0x96
    0069 E0E0      LDI	R30,0
    006A 071E      CPC	R17,R30
    006B F3D0      BCS	0x0066
    006C 9508      RET
_delay_nms:
  i                    --> R20
  n                    --> R22
    006D 940E0085  CALL	push_gset2
    006F 01B8      MOVW	R22,R16
(0023) {
(0024) } 
(0025) }
(0026) void delay_nms(unsigned int n)//延时n毫秒
(0027) {
(0028) unsigned int i;
(0029) for (i=0;i<n;i++)//执行n次1毫秒延时
    0070 2744      CLR	R20
    0071 2755      CLR	R21
    0072 C003      RJMP	0x0076
(0030) delay_1ms(); 
FILE: <library>
    0073 DFEF      RCALL	_delay_1ms
    0074 5F4F      SUBI	R20,0xFF
    0075 4F5F      SBCI	R21,0xFF
    0076 1746      CP	R20,R22
    0077 0757      CPC	R21,R23
    0078 F3D0      BCS	0x0073
    0079 940E007C  CALL	pop_gset2
    007B 9508      RET
pop_gset2:
    007C E0E2      LDI	R30,2
    007D 940C008B  JMP	pop
push_gset5:
    007F 92FA      ST	R15,-Y
    0080 92EA      ST	R14,-Y
push_gset4:
    0081 92DA      ST	R13,-Y
    0082 92CA      ST	R12,-Y
push_gset3:
    0083 92BA      ST	R11,-Y
    0084 92AA      ST	R10,-Y
push_gset2:
    0085 937A      ST	R23,-Y
    0086 936A      ST	R22,-Y
push_gset1:
    0087 935A      ST	R21,-Y
    0088 934A      ST	R20,-Y
    0089 9508      RET
pop_gset1:
    008A E0E1      LDI	R30,1
pop:
    008B 9149      LD	R20,Y+
    008C 9159      LD	R21,Y+
    008D FDE0      SBRC	R30,0
    008E 9508      RET
    008F 9169      LD	R22,Y+
    0090 9179      LD	R23,Y+
    0091 FDE1      SBRC	R30,1
    0092 9508      RET
    0093 90A9      LD	R10,Y+
    0094 90B9      LD	R11,Y+
    0095 FDE2      SBRC	R30,2
    0096 9508      RET
    0097 90C9      LD	R12,Y+
    0098 90D9      LD	R13,Y+
    0099 FDE3      SBRC	R30,3
    009A 9508      RET
    009B 90E9      LD	R14,Y+
    009C 90F9      LD	R15,Y+
    009D 9508      RET