04spi.lst

这是一个SPI总线的读写程序

__start:
__text_start:
    004B EFCF      LDI	R28,0xFF
    004C E1D0      LDI	R29,0x10
    004D BFCD      OUT	0x3D,R28
    004E BFDE      OUT	0x3E,R29
    004F 51C0      SUBI	R28,0x10
    0050 40D0      SBCI	R29,0
    0051 EA0A      LDI	R16,0xAA
    0052 8308      STD	Y+0,R16
    0053 2400      CLR	R0
    0054 E0EA      LDI	R30,0xA
    0055 E0F1      LDI	R31,1
    0056 E011      LDI	R17,1
    0057 30EA      CPI	R30,0xA
    0058 07F1      CPC	R31,R17
    0059 F011      BEQ	0x005C
    005A 9201      ST	R0,Z+
    005B CFFB      RJMP	0x0057
    005C 8300      STD	Z+0,R16
    005D E8EC      LDI	R30,0x8C
    005E E0F0      LDI	R31,0
    005F E0A0      LDI	R26,0
    0060 E0B1      LDI	R27,1
    0061 E010      LDI	R17,0
    0062 39E6      CPI	R30,0x96
    0063 07F1      CPC	R31,R17
    0064 F021      BEQ	0x0069
    0065 95C8      LPM
    0066 9631      ADIW	R30,1
    0067 920D      ST	R0,X+
    0068 CFF9      RJMP	0x0062
    0069 940E00A7  CALL	_main
_exit:
    006B CFFF      RJMP	_exit
_delay_ms:
  a                    --> R20
  b                    --> R22
  i                    --> R16
    006C 940E00C7  CALL	push_gset2
FILE: E:\ICCAVR\project\AVRMEG~3\icc\004-SPI\main.c
(0001) /*
(0002) 实验四：
(0003) 	SPI接口实险，LED数据管显示。
(0004) 	1、程序通过SPI接口输出数据到HC595芯片驱动LED数据管简单显示。
(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的所有8个短路块，JP6(SPI_EN)短路块。
(0007) 	4、此实验主要教大家如何使用SPI接口，让大家学会如何将SPI口设置为主机输出接口。
(0008) 
(0009) 	AVR  mega128学习板
(0010) 	www.iccavr.com	阿发
(0011) 	0:45 2007-10-10
(0012) */
(0013) 
(0014) #include "iom128v.h"
(0015) 
(0016) unsigned char disp[] = {0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};/*数码管显示码表*/
(0017) 
(0018) /*延时函数*/
(0019) void delay_ms(unsigned char i) {
(0020) 
(0021) 	unsigned char a, b;
(0022) 	for (a = 0; a < i; a++) {
    006E 2744      CLR	R20
    006F C006      RJMP	0x0076
(0023) 		for (b = 1; b; b++);
    0070 E061      LDI	R22,1
    0071 C001      RJMP	0x0073
    0072 9563      INC	R22
    0073 2366      TST	R22
    0074 F7E9      BNE	0x0072
    0075 9543      INC	R20
    0076 1740      CP	R20,R16
    0077 F3C0      BCS	0x0070
    0078 940E00BE  CALL	pop_gset2
    007A 9508      RET
(0024) 		}
(0025) }
(0026) 
(0027) /*IO口初始化函数*/
(0028) void io_init(void) {
(0029) 
(0030) 	DDRA = 0x00;										/*方向输入*/
_io_init:
    007B 2422      CLR	R2
    007C BA2A      OUT	0x1A,R2
(0031) 	PORTA = 0xFF;										/*打开上拉*/
    007D EF8F      LDI	R24,0xFF
    007E BB8B      OUT	0x1B,R24
(0032) 	DDRB = 0xF0;										/*设置高4位为输出，控制4位数码管*/
    007F EF80      LDI	R24,0xF0
    0080 BB87      OUT	0x17,R24
(0033) 	PORTB = 0x0F;										/*高4位输出低电平，点亮4位数码管*/
    0081 E08F      LDI	R24,0xF
    0082 BB88      OUT	0x18,R24
(0034) 	DDRC = 0x00;										/*不用的IO口建议设置为输入带上拉*/
    0083 BA24      OUT	0x14,R2
(0035) 	PORTC = 0xFF;
    0084 EF8F      LDI	R24,0xFF
    0085 BB85      OUT	0x15,R24
(0036) 	DDRD = 0x00;
    0086 BA21      OUT	0x11,R2
(0037) 	PORTD = 0xFF;
    0087 BB82      OUT	0x12,R24
(0038) 	DDRE = 0x00;
    0088 B822      OUT	0x02,R2
(0039) 	PORTE = 0xFF;
    0089 B983      OUT	0x03,R24
(0040) 	DDRF = 0x00;
    008A 92200061  STS	0x61,R2
(0041) 	PORTF = 0xFF;
    008C 93800062  STS	0x62,R24
(0042) 	DDRG = 0x00;
    008E 92200064  STS	0x64,R2
(0043) 	PORTG = 0xFF;
    0090 93800065  STS	0x65,R24
    0092 9508      RET
(0044) }
(0045) 
(0046) /*SPI接口初始化*/
(0047) void SPI_MasterInit(void) {
(0048) 
(0049) 	DDRB |= (1<<PB0) | (1<<PB1) | (1<<PB2);				/* 设置PB0、SCK、MOSI为输出，其他为输入 */
_SPI_MasterInit:
    0093 B387      IN	R24,0x17
    0094 6087      ORI	R24,7
    0095 BB87      OUT	0x17,R24
(0050) 	SPCR = (1<<SPE) | (1<<MSTR)
    0096 E583      LDI	R24,0x53
    0097 B98D      OUT	0x0D,R24
    0098 9508      RET
(0051) 		| (1<<SPR1) | (1<<SPR0);						/* 使能SPI 主机模式，设置时钟速率为fck/128 */
(0052) }
(0053) 
(0054) /*SPI数据发送*/
(0055) void SPI_MasterTransmit(unsigned char i) {
(0056) 	
(0057) 	SPDR = i;											/* 启动数据传输 */
_SPI_MasterTransmit:
  i                    --> R16
    0099 B90F      OUT	0x0F,R16
(0058) 	while (!(SPSR & (1<<SPIF)));						/* 等待传输结束 */
    009A 9B77      SBIS	0x0E,7
    009B CFFE      RJMP	0x009A
    009C 9508      RET
_SPI_595_Out:
  i                    --> R20
    009D 940E00C9  CALL	push_gset1
    009F 2F40      MOV	R20,R16
(0059) }
(0060) 
(0061) /*595数据输出*/
(0062) void SPI_595_Out(unsigned char i) {
(0063) 	PORTB &= ~(1 << PB0);								/*准备锁存*/
    00A0 98C0      CBI	0x18,0
(0064) 	SPI_MasterTransmit(i);
    00A1 2F04      MOV	R16,R20
    00A2 DFF6      RCALL	_SPI_MasterTransmit
(0065) 	PORTB |= (1 << PB0);								/*锁存数据*/
    00A3 9AC0      SBI	0x18,0
    00A4 940E00CC  CALL	pop_gset1
    00A6 9508      RET
(0066) }
(0067) 
(0068) void main(void) {
(0069) 
(0070) 	unsigned char i = 0;
_main:
  i                    --> R20
    00A7 2744      CLR	R20
(0071) 	
(0072) 	io_init();
    00A8 DFD2      RCALL	_io_init
(0073) 	SPI_MasterInit();
    00A9 DFE9      RCALL	_SPI_MasterInit
    00AA C011      RJMP	0x00BC
(0074) 	while (1) {
(0075) 		i ++;
    00AB 9543      INC	R20
(0076) 		if (i > 9) {
    00AC E089      LDI	R24,0x9
    00AD 1784      CP	R24,R20
    00AE F408      BCC	0x00B0
(0077) 			i = 0;
    00AF 2744      CLR	R20
(0078) 			}
(0079) 		delay_ms(250);
    00B0 EF0A      LDI	R16,0xFA
    00B1 DFBA      RCALL	_delay_ms
(0080) 		delay_ms(250);
    00B2 EF0A      LDI	R16,0xFA
    00B3 DFB8      RCALL	_delay_ms
(0081) 		SPI_595_Out(disp[i]);
FILE: <library>
    00B4 E080      LDI	R24,0
    00B5 E091      LDI	R25,1
    00B6 2FE4      MOV	R30,R20
    00B7 27FF      CLR	R31
    00B8 0FE8      ADD	R30,R24
    00B9 1FF9      ADC	R31,R25
    00BA 8100      LDD	R16,Z+0
    00BB DFE1      RCALL	_SPI_595_Out
    00BC CFEE      RJMP	0x00AB
    00BD 9508      RET
pop_gset2:
    00BE E0E2      LDI	R30,2
    00BF 940C00CD  JMP	pop
push_gset5:
    00C1 92FA      ST	R15,-Y
    00C2 92EA      ST	R14,-Y
push_gset4:
    00C3 92DA      ST	R13,-Y
    00C4 92CA      ST	R12,-Y
push_gset3:
    00C5 92BA      ST	R11,-Y
    00C6 92AA      ST	R10,-Y
push_gset2:
    00C7 937A      ST	R23,-Y
    00C8 936A      ST	R22,-Y
push_gset1:
    00C9 935A      ST	R21,-Y
    00CA 934A      ST	R20,-Y
    00CB 9508      RET
pop_gset1:
    00CC E0E1      LDI	R30,1
pop:
    00CD 9149      LD	R20,Y+
    00CE 9159      LD	R21,Y+
    00CF FDE0      SBRC	R30,0
    00D0 9508      RET
    00D1 9169      LD	R22,Y+
    00D2 9179      LD	R23,Y+
    00D3 FDE1      SBRC	R30,1
    00D4 9508      RET
    00D5 90A9      LD	R10,Y+
    00D6 90B9      LD	R11,Y+
    00D7 FDE2      SBRC	R30,2
    00D8 9508      RET
    00D9 90C9      LD	R12,Y+
    00DA 90D9      LD	R13,Y+
    00DB FDE3      SBRC	R30,3
    00DC 9508      RET
    00DD 90E9      LD	R14,Y+
    00DE 90F9      LD	R15,Y+
    00DF 9508      RET