012.lst

AVR单片机ATMEGA系列内部看门狗的实验程序。

__text_start:
__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 940E005A  CALL	_main
_exit:
    004A CFFF      RJMP	_exit
_delay_ms:
  a                    --> R20
  b                    --> R22
  i                    --> R16
    004B 940E0088  CALL	push_gset2
FILE: E:\ICCAVR\project\AVRMEG~2\icc\012-WATCHDOG\main.c
(0001) /*
(0002) 实验十二：
(0003) 	AVR内部看门口实验。
(0004) 	1、看门口实验。在主程序中周期喂狗，通过按下按键让程序无限循环，从而启动看门狗。
(0005) 	2、内部1 M晶振，程序采用单任务方式，软件延时。
(0006) 	3、进行此实验请插上JP1、JP3的所有8个短路块，JP7(LED_EN)短路块。
(0007) 	4、通过此实验可了解看门狗的设置及看门狗的喂狗等。
(0008) 
(0009) 	AVR  mega16学习板
(0010) 	www.iccavr.com
(0011) 	16:20 2007-4-9
(0012) */
(0013) 
(0014) #include "iom16v.h"
(0015) #include <macros.h>
(0016) 
(0017) /*延时函数*/
(0018) void delay_ms(unsigned char i) {
(0019) 
(0020) 	unsigned char a, b;
(0021) 	for (a = 1; a < i; a++) {
    004D E041      LDI	R20,1
    004E C006      RJMP	0x0055
(0022) 		for (b = 1; b; b++) {
    004F E061      LDI	R22,1
    0050 C001      RJMP	0x0052
    0051 9563      INC	R22
    0052 2366      TST	R22
    0053 F7E9      BNE	0x0051
    0054 9543      INC	R20
    0055 1740      CP	R20,R16
    0056 F3C0      BCS	0x004F
    0057 940E007F  CALL	pop_gset2
    0059 9508      RET
(0023) 			;
(0024) 			}
(0025) 		}
(0026) }
(0027) 
(0028) void main(void) {
(0029) 
(0030) 	DDRA = 0x00;				/*方向输入*/
_main:
    005A 2422      CLR	R2
    005B BA2A      OUT	0x1A,R2
(0031) 	PORTA = 0xFF;				/*打开上拉*/
    005C EF8F      LDI	R24,0xFF
    005D BB8B      OUT	0x1B,R24
(0032) 	DDRB = 0xFF;				/*方向输出*/
    005E BB87      OUT	0x17,R24
(0033) 	PORTB = 0xFF;				/*电平设置*/
    005F BB88      OUT	0x18,R24
(0034) 	DDRC = 0x00;
    0060 BA24      OUT	0x14,R2
(0035) 	PORTC = 0xFF;
    0061 BB85      OUT	0x15,R24
(0036) 	DDRD = 0x00;
    0062 BA21      OUT	0x11,R2
(0037) 	PORTD = 0xFF;
    0063 BB82      OUT	0x12,R24
(0038) 	
(0039) 	PORTB = 0x00;
    0064 BA28      OUT	0x18,R2
(0040) 	WDR();						/*喂狗*/
    0065 95A8      WDR
(0041) 	delay_ms(250);
    0066 EF0A      LDI	R16,0xFA
    0067 DFE3      RCALL	_delay_ms
(0042) 	WDR();						/*喂狗*/
    0068 95A8      WDR
(0043) 	delay_ms(250);
    0069 EF0A      LDI	R16,0xFA
    006A DFE0      RCALL	_delay_ms
(0044) 	PORTB = 0xFF;
    006B EF8F      LDI	R24,0xFF
    006C BB88      OUT	0x18,R24
(0045) 
(0046) 	WDTCR |= ((1 << WDTOE) | (1 << WDE));	/*启动时序*/
    006D B581      IN	R24,0x21
    006E 6188      ORI	R24,0x18
    006F BD81      OUT	0x21,R24
(0047) 	WDTCR = ((1<< WDE) | (1 << WDP2) | (1 <<WDP1));	/*设定周期为1S*/
    0070 E08E      LDI	R24,0xE
    0071 BD81      OUT	0x21,R24
    0072 C00A      RJMP	0x007D
(0048) 
(0049) 	while (1) {
(0050) 		delay_ms(250);
    0073 EF0A      LDI	R16,0xFA
    0074 DFD6      RCALL	_delay_ms
(0051) 		WDR();					/*喂狗*/
    0075 95A8      WDR
(0052) 		PORTB ^= (1 << 0);		/*PB0电平取反*/
    0076 E081      LDI	R24,1
    0077 B228      IN	R2,0x18
    0078 2628      EOR	R2,R24
    0079 BA28      OUT	0x18,R2
(0053) 		while(PINA != 0xFF);	/*检测按键*/
FILE: <library>
    007A B389      IN	R24,0x19
    007B 3F8F      CPI	R24,0xFF
    007C F7E9      BNE	0x007A
    007D CFF5      RJMP	0x0073
    007E 9508      RET
pop_gset2:
    007F E0E2      LDI	R30,2
    0080 940C008E  JMP	pop
push_gset5:
    0082 92FA      ST	R15,-Y
    0083 92EA      ST	R14,-Y
push_gset4:
    0084 92DA      ST	R13,-Y
    0085 92CA      ST	R12,-Y
push_gset3:
    0086 92BA      ST	R11,-Y
    0087 92AA      ST	R10,-Y
push_gset2:
    0088 937A      ST	R23,-Y
    0089 936A      ST	R22,-Y
push_gset1:
    008A 935A      ST	R21,-Y
    008B 934A      ST	R20,-Y
    008C 9508      RET
pop_gset1:
    008D E0E1      LDI	R30,1
pop:
    008E 9149      LD	R20,Y+
    008F 9159      LD	R21,Y+
    0090 FDE0      SBRC	R30,0
    0091 9508      RET
    0092 9169      LD	R22,Y+
    0093 9179      LD	R23,Y+
    0094 FDE1      SBRC	R30,1
    0095 9508      RET
    0096 90A9      LD	R10,Y+
    0097 90B9      LD	R11,Y+
    0098 FDE2      SBRC	R30,2
    0099 9508      RET
    009A 90C9      LD	R12,Y+
    009B 90D9      LD	R13,Y+
    009C FDE3      SBRC	R30,3
    009D 9508      RET
    009E 90E9      LD	R14,Y+
    009F 90F9      LD	R15,Y+
    00A0 9508      RET