led.lst

SPI接口实险

__start:
__text_start:
    002A E5CF      LDI	R28,0x5F
    002B E0D4      LDI	R29,4
    002C BFCD      OUT	0x3D,R28
    002D BFDE      OUT	0x3E,R29
    002E 51CE      SUBI	R28,0x1E
    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 940E0066  CALL	_main
_exit:
    004A CFFF      RJMP	_exit
FILE: C:\icc\examples.avr\LED\led.c
(0001) #include <iom16v.h>
(0002) #include <macros.h>
(0003) 
(0004) /* This seems to produce the right amount of delay for the LED to be
(0005)  * seen
(0006)  */
(0007) void Delay()
(0008) 	{
(0009) 	unsigned char a, b;
(0010) 
(0011) 	for (a = 1; a; a++)
_Delay:
  a                    --> R16
  b                    --> R18
    004B E001      LDI	R16,1
    004C C006      RJMP	0x0053
(0012) 		for (b = 1; b; b++)
    004D E021      LDI	R18,1
    004E C001      RJMP	0x0050
    004F 9523      INC	R18
    0050 2322      TST	R18
    0051 F7E9      BNE	0x004F
    0052 9503      INC	R16
    0053 2300      TST	R16
    0054 F7C1      BNE	0x004D
    0055 9508      RET
_LED_On:
  i                    --> R20
    0056 940E009E  CALL	push_gset1
    0058 01A8      MOVW	R20,R16
(0013) 			;
(0014) 	}
(0015) 
(0016) void LED_On(int i)
(0017) 	{
(0018) 	PORTB = ~BIT(i);	/* low output to turn LED on */
    0059 E001      LDI	R16,1
    005A E010      LDI	R17,0
    005B 019A      MOVW	R18,R20
    005C 940E00B5  CALL	lsl16
    005E 0118      MOVW	R2,R16
    005F 9420      COM	R2
    0060 9430      COM	R3
    0061 BA28      OUT	0x18,R2
(0019) 	Delay();
    0062 DFE8      RCALL	_Delay
    0063 940E00A1  CALL	pop_gset1
    0065 9508      RET
(0020) 	}
(0021) 
(0022) void main()
(0023) 	{
(0024) 	int i;
(0025) 	DDRB = 0xFF;	/* output */
_main:
  i                    --> R20
    0066 EF8F      LDI	R24,0xFF
    0067 BB87      OUT	0x17,R24
(0026) 	PORTB = 0xFF;	/* all off */
    0068 BB88      OUT	0x18,R24
    0069 C02A      RJMP	0x0094
(0027) 
(0028) 	while (1)
(0029) 		{
(0030) 		/* forward march */
(0031) 		for (i = 0; i < 8; i++)
    006A 2744      CLR	R20
    006B 2755      CLR	R21
(0032) 			LED_On(i);
    006C 018A      MOVW	R16,R20
    006D DFE8      RCALL	_LED_On
    006E 5F4F      SUBI	R20,0xFF
    006F 4F5F      SBCI	R21,0xFF
    0070 3048      CPI	R20,0x8
    0071 E0E0      LDI	R30,0
    0072 075E      CPC	R21,R30
    0073 F3C4      BLT	0x006C
(0033) 		/* backward march */
(0034) 		for (i = 8; i > 0; i--)
    0074 E048      LDI	R20,0x8
    0075 E050      LDI	R21,0
(0035) 			LED_On(i);
    0076 018A      MOVW	R16,R20
    0077 DFDE      RCALL	_LED_On
    0078 5041      SUBI	R20,1
    0079 4050      SBCI	R21,0
    007A 2422      CLR	R2
    007B 2433      CLR	R3
    007C 1624      CP	R2,R20
    007D 0635      CPC	R3,R21
    007E F3BC      BLT	0x0076
(0036) 		/* skip */
(0037) 		for (i = 0; i < 8; i += 2)
    007F 2744      CLR	R20
    0080 2755      CLR	R21
(0038) 			LED_On(i);
    0081 018A      MOVW	R16,R20
    0082 DFD3      RCALL	_LED_On
    0083 5F4E      SUBI	R20,0xFE
    0084 4F5F      SBCI	R21,0xFF
    0085 3048      CPI	R20,0x8
    0086 E0E0      LDI	R30,0
    0087 075E      CPC	R21,R30
    0088 F3C4      BLT	0x0081
(0039) 		for (i = 7; i > 0; i -= 2)
    0089 E047      LDI	R20,7
    008A E050      LDI	R21,0
(0040) 			LED_On(i);
FILE: <library>
    008B 018A      MOVW	R16,R20
    008C DFC9      RCALL	_LED_On
    008D 5042      SUBI	R20,2
    008E 4050      SBCI	R21,0
    008F 2422      CLR	R2
    0090 2433      CLR	R3
    0091 1624      CP	R2,R20
    0092 0635      CPC	R3,R21
    0093 F3BC      BLT	0x008B
    0094 CFD5      RJMP	0x006A
    0095 9508      RET
push_gset5:
    0096 92FA      ST	R15,-Y
    0097 92EA      ST	R14,-Y
push_gset4:
    0098 92DA      ST	R13,-Y
    0099 92CA      ST	R12,-Y
push_gset3:
    009A 92BA      ST	R11,-Y
    009B 92AA      ST	R10,-Y
push_gset2:
    009C 937A      ST	R23,-Y
    009D 936A      ST	R22,-Y
push_gset1:
    009E 935A      ST	R21,-Y
    009F 934A      ST	R20,-Y
    00A0 9508      RET
pop_gset1:
    00A1 E0E1      LDI	R30,1
pop:
    00A2 9149      LD	R20,Y+
    00A3 9159      LD	R21,Y+
    00A4 FDE0      SBRC	R30,0
    00A5 9508      RET
    00A6 9169      LD	R22,Y+
    00A7 9179      LD	R23,Y+
    00A8 FDE1      SBRC	R30,1
    00A9 9508      RET
    00AA 90A9      LD	R10,Y+
    00AB 90B9      LD	R11,Y+
    00AC FDE2      SBRC	R30,2
    00AD 9508      RET
    00AE 90C9      LD	R12,Y+
    00AF 90D9      LD	R13,Y+
    00B0 FDE3      SBRC	R30,3
    00B1 9508      RET
    00B2 90E9      LD	R14,Y+
    00B3 90F9      LD	R15,Y+
    00B4 9508      RET
lsl16:
    00B5 2322      TST	R18
    00B6 F021      BEQ	0x00BB
    00B7 0F00      LSL	R16
    00B8 1F11      ROL	R17
    00B9 952A      DEC	R18
    00BA CFFA      RJMP	lsl16
    00BB 9508      RET