main.lst

一个关于AVR单片机的例程

__text_start:
__start:
    002B E5CF      LDI	R28,0x5F
    002C E0D4      LDI	R29,4
    002D BFCD      OUT	0x3D,R28
    002E BFDE      OUT	0x3E,R29
    002F 51C0      SUBI	R28,0x10
    0030 40D0      SBCI	R29,0
    0031 EA0A      LDI	R16,0xAA
    0032 8308      STD	Y+0,R16
    0033 2400      CLR	R0
    0034 E6E1      LDI	R30,0x61
    0035 E0F0      LDI	R31,0
    0036 E010      LDI	R17,0
    0037 36E1      CPI	R30,0x61
    0038 07F1      CPC	R31,R17
    0039 F011      BEQ	0x003C
    003A 9201      ST	R0,Z+
    003B CFFB      RJMP	0x0037
    003C 8300      STD	Z+0,R16
    003D E5E4      LDI	R30,0x54
    003E E0F0      LDI	R31,0
    003F E6A0      LDI	R26,0x60
    0040 E0B0      LDI	R27,0
    0041 E010      LDI	R17,0
    0042 35E5      CPI	R30,0x55
    0043 07F1      CPC	R31,R17
    0044 F021      BEQ	0x0049
    0045 95C8      LPM
    0046 9631      ADIW	R30,1
    0047 920D      ST	R0,X+
    0048 CFF9      RJMP	0x0042
    0049 940E0081  CALL	_main
_exit:
    004B CFFF      RJMP	_exit
FILE: E:\avr\2.5.2\main.c
(0001) //ICC-AVR application builder : 2007-5-30 15:23:23
(0002) // Target : M16
(0003) // Crystal: 7.3728Mhz
(0004) 
(0005) #include <iom16v.h>
(0006) #include <macros.h>
(0007) 
(0008) volatile unsigned char tmp=0;
(0009) 
(0010) void port_init(void)
(0011) {
(0012)  PORTA = 0x00;
_port_init:
    004C 2422      CLR	R2
    004D BA2B      OUT	0x1B,R2
(0013)  DDRA  = 0x00;
    004E BA2A      OUT	0x1A,R2
(0014)  PORTB = 0x00;
    004F BA28      OUT	0x18,R2
(0015)  DDRB  = 0x00;
    0050 BA27      OUT	0x17,R2
(0016)  PORTC = 0x00; //m103 output only
    0051 BA25      OUT	0x15,R2
(0017)  DDRC  = 0x00;
    0052 BA24      OUT	0x14,R2
(0018)  PORTD = 0x00;
    0053 BA22      OUT	0x12,R2
(0019)  DDRD  = 0x00;
    0054 BA21      OUT	0x11,R2
    0055 9508      RET
(0020) }
(0021) 
(0022) //UART0 initialize
(0023) // desired baud rate: 9600
(0024) // actual: baud rate:9600 (0.0%)
(0025) // char size: 8 bit
(0026) // parity: Disabled
(0027) void uart0_init(void)
(0028) {
(0029)  UCSRB = 0x00; //disable while setting baud rate
_uart0_init:
    0056 2422      CLR	R2
    0057 B82A      OUT	0x0A,R2
(0030)  UCSRA = 0x00;
    0058 B82B      OUT	0x0B,R2
(0031)  UCSRC = BIT(URSEL) | 0x06;
    0059 E886      LDI	R24,0x86
    005A BD80      OUT	0x20,R24
(0032)  UBRRL = 0x2F; //set baud rate lo
    005B E28F      LDI	R24,0x2F
    005C B989      OUT	0x09,R24
(0033)  UBRRH = 0x00; //set baud rate hi
    005D BC20      OUT	0x20,R2
(0034)  UCSRB = (1<<RXCIE)|(1<<TXCIE)|(1<<RXEN)|(1<<TXEN);
    005E ED88      LDI	R24,0xD8
    005F B98A      OUT	0x0A,R24
    0060 9508      RET
_uart0_rx_isr:
    0061 922A      ST	R2,-Y
    0062 B62F      IN	R2,0x3F
    0063 922A      ST	R2,-Y
(0035) }
(0036) 
(0037) #pragma interrupt_handler uart0_rx_isr:12
(0038) void uart0_rx_isr(void)
(0039) {
(0040)  //uart has received a character in UDR
(0041)  tmp=UDR; //读取接收到的数
    0064 B02C      IN	R2,0x0C
    0065 92200060  STS	tmp,R2
(0042)  UDR=tmp; //启动发送
    0067 90200060  LDS	R2,tmp
    0069 B82C      OUT	0x0C,R2
    006A 9029      LD	R2,Y+
    006B BE2F      OUT	0x3F,R2
    006C 9029      LD	R2,Y+
    006D 9518      RETI
_uart0_tx_isr:
    006E 922A      ST	R2,-Y
    006F B62F      IN	R2,0x3F
    0070 922A      ST	R2,-Y
(0043) }
(0044) 
(0045) /*
(0046) #pragma interrupt_handler uart0_udre_isr:13
(0047) void uart0_udre_isr(void)
(0048) {
(0049)  //character transferred to shift register so UDR is now empty
(0050)  UDR='x'; //是空就让，传输完成接着就会进入本中断。
(0051) }
(0052) */
(0053) 
(0054) #pragma interrupt_handler uart0_tx_isr:14
(0055) void uart0_tx_isr(void)
(0056) {
(0057)  //character has been transmitted
(0058)  UDR=tmp;
    0071 90200060  LDS	R2,tmp
    0073 B82C      OUT	0x0C,R2
    0074 9029      LD	R2,Y+
    0075 BE2F      OUT	0x3F,R2
    0076 9029      LD	R2,Y+
    0077 9518      RETI
(0059) }
(0060) 
(0061) //call this routine to initialize all peripherals
(0062) void init_devices(void)
(0063) {
(0064)  //stop errant interrupts until set up
(0065)  CLI(); //disable all interrupts
_init_devices:
    0078 94F8      BCLR	7
(0066)  port_init();
    0079 DFD2      RCALL	_port_init
(0067)  uart0_init();
    007A DFDB      RCALL	_uart0_init
(0068) 
(0069)  MCUCR = 0x00;
    007B 2422      CLR	R2
    007C BE25      OUT	0x35,R2
(0070)  GICR  = 0x00;
    007D BE2B      OUT	0x3B,R2
(0071)  TIMSK = 0x00; //timer interrupt sources
    007E BE29      OUT	0x39,R2
(0072)  SEI(); //re-enable interrupts
    007F 9478      BSET	7
    0080 9508      RET
(0073)  //all peripherals are now initialized
(0074) }
(0075) 
(0076) void main(void)
(0077) {
(0078)  init_devices();  //主程序里面只初始化
_main:
    0081 DFF6      RCALL	_init_devices
(0079)  UDR=tmp;
    0082 90200060  LDS	R2,tmp
    0084 B82C      OUT	0x0C,R2
(0080)  while(1)
FILE: <library>
    0085 CFFF      RJMP	0x0085
    0086 9508      RET