485bus.lst

我自己编写的atmega16的485通讯的范例

__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 940E004B  CALL	_main
_exit:
    004A CFFF      RJMP	_exit
FILE: J:\自编程序\M16\485bus\mian.c
(0001) #include<iom16v.h>
(0002) #include<macros.h>
(0003) //#define 485bus_recive PORTD|=0X04;
(0004) //#define 485bus_send PORTD&=0XFB;
(0005) void main (void)
(0006) {
(0007)    USART_Init();
_main:
    004B 940E0054  CALL	_USART_Init
    004D C004      RJMP	0x0052
(0008)    while(1)
(0009)    {
(0010)    USART_Transmit(USART_Recive());
    004E 940E0061  CALL	_USART_Recive
    0050 940E005D  CALL	_USART_Transmit
    0052 CFFB      RJMP	0x004E
(0011)   }}
    0053 9508      RET
FILE: J:\自编程序\M16\485bus\UART.C
(0001) #include<iom16v.h>
(0002) #include<macros.h>
(0003) #pragma interrupt_handler	USART_Recive_Complete_handler:12
(0004) #pragma interrupt_handler	USART_Data_Register_Empty_handler:13
(0005) #pragma interrupt_handler	USART_Transmit_Complete_handler:14
(0006) void USART_Init(void)
(0007) {
(0008)  //{{WIZARD_MAP(UART)
(0009)     // crystal: 8M
(0010) 	// Baud Rate: 9600
(0011) 	// Character Size: 8-bit
(0012) 	// Mode: Asynchronous
(0013) 	// Parity: Disabled
(0014) 	// Stop Bit: 1-bit
(0015) 	UBRR= 0x33;
_USART_Init:
    0054 E383      LDI	R24,0x33
    0055 B989      OUT	0x09,R24
(0016) 	
(0017) 	UCSRA = 0x00;
    0056 2422      CLR	R2
    0057 B82B      OUT	0x0B,R2
(0018) 	UCSRC = 0x86;
    0058 E886      LDI	R24,0x86
    0059 BD80      OUT	0x20,R24
(0019) 	UCSRB = 0x18;
    005A E188      LDI	R24,0x18
    005B B98A      OUT	0x0A,R24
(0020) 	//UCSRB|=0X80;//开接收结束中断
(0021) 	//UCSRB|=0X40;//开发送结束中断
(0022)     //UCSRB|=0X20;//开数据寄存器空中断
(0023) }
    005C 9508      RET
(0024) void USART_Transmit(unsigned char data)
(0025) {
(0026)    /* 等待发送缓冲器为空 */
(0027)    while ( !( UCSRA & (1<<UDRE)) );
_USART_Transmit:
  data                 --> R16
    005D 9B5D      SBIS	0x0B,5
    005E CFFE      RJMP	_USART_Transmit
(0028)   /* 将数据放入缓冲器，发送数据 */
(0029)   UDR = data;
    005F B90C      OUT	0x0C,R16
(0030) }
    0060 9508      RET
(0031) unsigned char USART_Recive(void)
(0032) {
(0033)  	/* 等待接收数据*/
(0034) 	while ( !(UCSRA & (1<<RXC)) );
_USART_Recive:
    0061 9B5F      SBIS	0x0B,7
    0062 CFFE      RJMP	_USART_Recive
(0035) 	/* 从缓冲器中获取并返回数据*/
(0036) 	return UDR;
    0063 B10C      IN	R16,0x0C
    0064 9508      RET
(0037) }
(0038) void USART_Recive_Complete_handler(void)
(0039) {
(0040) 
(0041) }
_USART_Recive_Complete_handler:
    0065 9518      RETI
(0042) void USART_Data_Register_Empty_handler(void)
(0043) {
(0044) 
(0045) }void USART_Transmit_Complete_handler(void)
_USART_Data_Register_Empty_handler:
    0066 9518      RETI
(0046) {
(0047) 
(0048) }
FILE: <library>
_USART_Transmit_Complete_handler:
    0067 9518      RETI