main.lst

一个关于AVR单片机的例程

__start:
__text_start:
    0033 E5CF      LDI	R28,0x5F
    0034 E0D4      LDI	R29,4
    0035 BFCD      OUT	0x3D,R28
    0036 BFDE      OUT	0x3E,R29
    0037 51C0      SUBI	R28,0x10
    0038 40D0      SBCI	R29,0
    0039 EA0A      LDI	R16,0xAA
    003A 8308      STD	Y+0,R16
    003B 2400      CLR	R0
    003C E6E0      LDI	R30,0x60
    003D E0F0      LDI	R31,0
    003E E010      LDI	R17,0
    003F 36E0      CPI	R30,0x60
    0040 07F1      CPC	R31,R17
    0041 F011      BEQ	0x0044
    0042 9201      ST	R0,Z+
    0043 CFFB      RJMP	0x003F
    0044 8300      STD	Z+0,R16
    0045 E6E5      LDI	R30,0x65
    0046 E0F0      LDI	R31,0
    0047 E6A0      LDI	R26,0x60
    0048 E0B0      LDI	R27,0
    0049 E010      LDI	R17,0
    004A 36E5      CPI	R30,0x65
    004B 07F1      CPC	R31,R17
    004C F021      BEQ	0x0051
    004D 95C8      LPM
    004E 9631      ADIW	R30,1
    004F 920D      ST	R0,X+
    0050 CFF9      RJMP	0x004A
    0051 940E007B  CALL	_main
_exit:
    0053 CFFF      RJMP	_exit
FILE: E:\avr\2.1.6\main.c
(0001) //ICC-AVR application builder : 2007-5-29 15:21:23
(0002) // Target : M16
(0003) // Crystal: 7.3728Mhz
(0004) 
(0005) #include <iom16v.h>
(0006) #include <macros.h>
(0007) 
(0008) const unsigned char seg7_data[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};//0~F and "shut"
(0009) 
(0010) 
(0011) void port_init(void)
(0012) {
(0013)  PORTA = 0xFF;
_port_init:
    0054 EF8F      LDI	R24,0xFF
    0055 BB8B      OUT	0x1B,R24
(0014)  DDRA  = 0xFF;
    0056 BB8A      OUT	0x1A,R24
(0015)  PORTB = 0x01; //PB0，是TIMER0的外部时钟输入脚（T0），需要设为输入，并且使能内部上拉
    0057 E081      LDI	R24,1
    0058 BB88      OUT	0x18,R24
(0016)  DDRB  = 0x00;
    0059 2422      CLR	R2
    005A BA27      OUT	0x17,R2
(0017)  PORTC = 0x00; //m103 output only
    005B BA25      OUT	0x15,R2
(0018)  DDRC  = 0x00;
    005C BA24      OUT	0x14,R2
(0019)  PORTD = 0x00;
    005D BA22      OUT	0x12,R2
(0020)  DDRD  = 0x00;
    005E BA21      OUT	0x11,R2
    005F 9508      RET
(0021) }
(0022) 
(0023) //TIMER0 initialize - prescale:Falling edge
(0024) // WGM: Normal
(0025) // desired value: 1KHz
(0026) // actual value: Out of range
(0027) void timer0_init(void)
(0028) {
(0029)  TCCR0 = 0x00; //stop
_timer0_init:
    0060 2422      CLR	R2
    0061 BE23      OUT	0x33,R2
(0030)  TCNT0 = 0x00; //set count
    0062 BE22      OUT	0x32,R2
(0031)  OCR0  = 0x0A;  //set compare十进制的十，十次按键后匹配，进入这里
    0063 E08A      LDI	R24,0xA
    0064 BF8C      OUT	0x3C,R24
(0032)  TCCR0 = 0x06; //start timer
    0065 E086      LDI	R24,6
    0066 BF83      OUT	0x33,R24
    0067 9508      RET
_timer0_comp_isr:
    0068 922A      ST	R2,-Y
    0069 B62F      IN	R2,0x3F
    006A 922A      ST	R2,-Y
(0033) }
(0034) 
(0035) #pragma interrupt_handler timer0_comp_isr:20
(0036) void timer0_comp_isr(void)
(0037) {
(0038)  //compare occured TCNT0=OCR0
(0039)  //按下键OCR0次后，会进入本中断
(0040)  TCNT0 = 0x00;
    006B 2422      CLR	R2
    006C BE22      OUT	0x32,R2
    006D 9029      LD	R2,Y+
    006E BE2F      OUT	0x3F,R2
    006F 9029      LD	R2,Y+
    0070 9518      RETI
(0041) }
(0042) 
(0043) //call this routine to initialize all peripherals
(0044) void init_devices(void)
(0045) {
(0046)  //stop errant interrupts until set up
(0047)  CLI(); //disable all interrupts
_init_devices:
    0071 94F8      BCLR	7
(0048)  port_init();
    0072 DFE1      RCALL	_port_init
(0049)  timer0_init();
    0073 DFEC      RCALL	_timer0_init
(0050) 
(0051)  MCUCR = 0x00;
    0074 2422      CLR	R2
    0075 BE25      OUT	0x35,R2
(0052)  GICR  = 0x00;
    0076 BE2B      OUT	0x3B,R2
(0053)  TIMSK = 0x02; //timer interrupt sources
    0077 E082      LDI	R24,2
    0078 BF89      OUT	0x39,R24
(0054)  SEI(); //re-enable interrupts
    0079 9478      BSET	7
    007A 9508      RET
(0055)  //all peripherals are now initialized
(0056) }
(0057) 
(0058) void main(void)
(0059) {
(0060)  init_devices();
_main:
    007B DFF5      RCALL	_init_devices
    007C C008      RJMP	0x0085
(0061)  while(1)
(0062)  {
(0063)   PORTA = seg7_data[TCNT0];
FILE: <library>
    007D E584      LDI	R24,0x54
    007E E090      LDI	R25,0
    007F B7E2      IN	R30,0x32
    0080 27FF      CLR	R31
    0081 0FE8      ADD	R30,R24
    0082 1FF9      ADC	R31,R25
    0083 91E4      LPM	R30,0(Z)
    0084 BBEB      OUT	0x1B,R30
    0085 CFF7      RJMP	0x007D
    0086 9508      RET