pwm_ctc.lst

avr单片机pwm功能的使用

__start:
__text_start:
    001A EFCF      LDI	R28,0xFF
    001B E0D2      LDI	R29,2
    001C BFCD      OUT	0x3D,R28
    001D BFDE      OUT	0x3E,R29
    001E 51C0      SUBI	R28,0x10
    001F 40D0      SBCI	R29,0
    0020 EA0A      LDI	R16,0xAA
    0021 8308      STD	Y+0,R16
    0022 2400      CLR	R0
    0023 E0E0      LDI	R30,0
    0024 E0F1      LDI	R31,1
    0025 E011      LDI	R17,1
    0026 30E0      CPI	R30,0
    0027 07F1      CPC	R31,R17
    0028 F011      BEQ	0x002B
    0029 9201      ST	R0,Z+
    002A CFFB      RJMP	0x0026
    002B 8300      STD	Z+0,R16
    002C E3E4      LDI	R30,0x34
    002D E0F0      LDI	R31,0
    002E E0A0      LDI	R26,0
    002F E0B1      LDI	R27,1
    0030 E010      LDI	R17,0
    0031 33E4      CPI	R30,0x34
    0032 07F1      CPC	R31,R17
    0033 F021      BEQ	0x0038
    0034 95C8      LPM
    0035 9631      ADIW	R30,1
    0036 920D      ST	R0,X+
    0037 CFF9      RJMP	0x0031
    0038 D03C      RCALL	_main
_exit:
    0039 CFFF      RJMP	_exit
FILE: F:\avrprojs\pwm_ctc\pwm_ctc.c
(0001) //ICC-AVR application builder : 2008-8-4 下午 05:07:24
(0002) // Target : M48
(0003) // Crystal: 1.0000Mhz
(0004) 
(0005) #include <iom48v.h>
(0006) #include <macros.h>
(0007) 
(0008) void port_init(void)
(0009) {
(0010)  PORTB = 0x00;
_port_init:
    003A 2422      CLR	R2
    003B B825      OUT	0x05,R2
(0011)  DDRB  = 0x00;
    003C B824      OUT	0x04,R2
(0012)  PORTC = 0x00; //m103 output only
    003D B828      OUT	0x08,R2
(0013)  DDRC  = 0x00;
    003E B827      OUT	0x07,R2
(0014)  PORTD = 0x00;
    003F B82B      OUT	0x0B,R2
(0015)  DDRD  = 0x60;
    0040 E680      LDI	R24,0x60
    0041 B98A      OUT	0x0A,R24
    0042 9508      RET
(0016) }
(0017) 
(0018) //TIMER0 initialize - prescale:8
(0019) // WGM: CTC
(0020) // desired value: 1000Hz
(0021) // actual value: 992.063Hz (-0.8%)
(0022) void timer0_init(void)
(0023) {
(0024)  TCCR0B = 0x00; //stop
_timer0_init:
    0043 2422      CLR	R2
    0044 BC25      OUT	0x25,R2
(0025)  TCNT0 = 0x01; //set count
    0045 E081      LDI	R24,1
    0046 BD86      OUT	0x26,R24
(0026)  TCCR0A = 0x72; 
    0047 E782      LDI	R24,0x72
    0048 BD84      OUT	0x24,R24
(0027)  TCCR0B = 0x0b; //start timer
    0049 E08B      LDI	R24,0xB
    004A BD85      OUT	0x25,R24
(0028)  OCR0A= 0x80;
    004B E880      LDI	R24,0x80
    004C BD87      OUT	0x27,R24
    004D 9508      RET
_timer0_compa_isr:
    004E 938A      ST	R24,-Y
    004F B78F      IN	R24,0x3F
    0050 938A      ST	R24,-Y
(0029) }
(0030) 
(0031) #pragma interrupt_handler timer0_compa_isr:15
(0032) void timer0_compa_isr(void)
(0033) {
(0034)  TCNT0=0x01;
    0051 E081      LDI	R24,1
    0052 BD86      OUT	0x26,R24
(0035)  OCR0A= 0x80;
    0053 E880      LDI	R24,0x80
    0054 BD87      OUT	0x27,R24
    0055 9189      LD	R24,Y+
    0056 BF8F      OUT	0x3F,R24
    0057 9189      LD	R24,Y+
    0058 9518      RETI
(0036)  //compare TCNT0=OCR0A
(0037) }
(0038) 
(0039) #pragma interrupt_handler timer0_compb_isr:16
(0040) void timer0_compb_isr(void)
(0041) {
_timer0_compb_isr:
    0059 9518      RETI
(0042)  //compare TCNT0=OCR0B
(0043) }
(0044) 
(0045) //call this routine to initialize all peripherals
(0046) void init_devices(void)
(0047) {
(0048)  //stop errant interrupts until set up
(0049)  CLI(); //disable all interrupts
_init_devices:
    005A 94F8      BCLR	7
(0050)  port_init();
    005B DFDE      RCALL	_port_init
(0051)  timer0_init();
    005C DFE6      RCALL	_timer0_init
(0052) 
(0053)  MCUCR = 0x00;
    005D 2422      CLR	R2
    005E BE25      OUT	0x35,R2
(0054)  EICRA = 0x00; //extended ext ints
    005F 92200069  STS	0x69,R2
(0055)  EIMSK = 0x00;
    0061 BA2D      OUT	0x1D,R2
(0056)  
(0057)  TIMSK0 = 0x06; //timer 0 interrupt sources
    0062 E086      LDI	R24,6
    0063 9380006E  STS	0x6E,R24
(0058)  TIMSK1 = 0x00; //timer 1 interrupt sources
    0065 9220006F  STS	0x6F,R2
(0059)  TIMSK2 = 0x00; //timer 2 interrupt sources
    0067 92200070  STS	0x70,R2
(0060)  
(0061)  PCMSK0 = 0x00; //pin change mask 0 
    0069 9220006B  STS	0x6B,R2
(0062)  PCMSK1 = 0x00; //pin change mask 1 
    006B 9220006C  STS	0x6C,R2
(0063)  PCMSK2 = 0x00; //pin change mask 2
    006D 9220006D  STS	0x6D,R2
(0064)  PCICR = 0x00; //pin change enable 
    006F 92200068  STS	0x68,R2
(0065)  PRR = 0x00; //power controller
    0071 92200064  STS	0x64,R2
(0066)  SEI(); //re-enable interrupts
    0073 9478      BSET	7
    0074 9508      RET
(0067)  //all peripherals are now initialized
(0068) }
(0069) void main()
(0070) {
(0071) init_devices();
_main:
    0075 DFE4      RCALL	_init_devices
(0072) 
(0073) while(1)
FILE: <library>
    0076 CFFF      RJMP	0x0076
    0077 9508      RET