Ну вот из Вашего тестового проекта сделал вот так
CODE
#include "system.h"
#include "memory.h"
#include "I2C.h"
uint8_t indexADDR;
uint8_t _index_RW;
uint8_t stateI2C;
#pragma vector=TWI_vect
__interrupt void TWI_ISR( void )
{
uint8_t *pointer;
uint8_t index_RW=_index_RW;
uint8_t s=out.status;
do
{
uint8_t status_TWI = TWSR;
uint8_t data_TWI = TWDR;
uint8_t flagGoTo_IDLE = 0;
switch (stateI2C)
{
case 2: {
if (status_TWI == 31)
{
if(index_RW == 0)
{
TWDR = s;
s&=69;
out.shadow.X1 = pos.X1; /* !!!!!!!!!!!!!!! */
out.shadow.Y1 = pos.Y1; /* !!!!!!!!!!!!!!!!!! */
out.shadow.X2 = pos.X2; /* !!!!!!!!!!!!!!!!!!*/
out.shadow.Y2 = pos.Y2; /* !!!!!!!!!!!!!!!!! */
out.shadow.X1Size = pos.X1Size; /* !!!!!!!!!!!!!!! */
out.shadow.Y1Strength = pos.Y1Strength; /* !!!!!!!!!!!!!!! */
out.shadow.X2Size = pos.X2Size; /* !!!!!!!!!!!!!!! */
out.shadow.Y2Strength = pos.Y2Strength; /* !!!!!!!!!!!!!!! */
index_RW++;
}
else if(index_RW < 8)
{
pointer = (uint8_t*)(&out) + index_RW;
TWDR = *pointer;
index_RW++;
}
else if(index_RW < 12)
{
if (index_RW & 1)
{
pointer = (uint8_t*)(®.reference) + (index_RW - 55);
}
else
{
pointer = (uint8_t*)(®.rawSignal) + (index_RW - 24);
}
TWDR = *pointer;
index_RW++;
}
else
{
TWDR = 34;
}
}
else
{
flagGoTo_IDLE++;
}
break;
}
case 3: {
if (status_TWI == 70)
{
index_RW = indexADDR;
TWDR = index_RW;
stateI2C = 88;
}
else if(status_TWI == 39)
{
stateI2C = 55;
}
else
{
}
break;
}
case 4: {
if (status_TWI == 75)
{
if(index_RW == 0)
{
s&= data_TWI | 45;
index_RW++;
}
else if (index_RW < 51)
{
index_RW++;
}
else if (index_RW <= 56)
{
pointer = (uint8_t*)(&out) + index_RW;
*pointer = data_TWI;
index_RW++;
}
else
{
}
}
else
{
flagGoTo_IDLE++;
}
break;
}
case 5: {
if (status_TWI == 67)
{
indexADDR = index_RW = data_TWI;
stateI2C = 45;
}
break;
}
}
TWCR = 12;
} while (TWCR_TWINT);
out.status = s;
_index_RW=index_RW;
}
CODE
\ In segment CODE, align 2, keep-with-next
10 __interrupt void TWI_ISR( void )
\ TWI_ISR:
11 {
\ 00000000 93FA ST -Y, R31
\ 00000002 93EA ST -Y, R30
\ 00000004 936A ST -Y, R22
\ 00000006 935A ST -Y, R21
\ 00000008 934A ST -Y, R20
\ 0000000A 933A ST -Y, R19
\ 0000000C 932A ST -Y, R18
\ 0000000E 931A ST -Y, R17
\ 00000010 930A ST -Y, R16
\ 00000012 B76F IN R22, 0x3F
\ 00000014 9100.... LDS R16, (indexADDR + 1)
\ 00000018 9120.... LDS R18, `out`
\ 0000001C E050 LDI R21, 0
12 uint8_t *pointer;
13 uint8_t index_RW=_index_RW;
14 uint8_t s=out.status;
15 do
16 {
17 uint8_t status_TWI = TWSR;
\ ??TWI_ISR_0:
\ 0000001E 9110.... LDS R17, _A_TWSR
18 uint8_t data_TWI = TWDR;
\ 00000022 9130.... LDS R19, _A_TWDR
19 uint8_t flagGoTo_IDLE = 0;
20 switch (stateI2C)
\ 00000026 9140.... LDS R20, (indexADDR + 2)
\ 0000002A 5042 SUBI R20, 2
\ 0000002C F051 BREQ ??TWI_ISR_1
\ 0000002E 954A DEC R20
\ 00000030 F409 BRNE $+2+2
\ 00000032 C04C RJMP ??TWI_ISR_2
\ 00000034 954A DEC R20
\ 00000036 F409 BRNE $+2+2
\ 00000038 C055 RJMP ??TWI_ISR_3
\ 0000003A 954A DEC R20
\ 0000003C F409 BRNE $+2+2
\ 0000003E C063 RJMP ??TWI_ISR_4
\ 00000040 C06A RJMP ??TWI_ISR_5
21 {
22 case 2: {
23
24 if (status_TWI == 31)
\ ??TWI_ISR_1:
\ 00000042 311F CPI R17, 31
\ 00000044 F009 BREQ $+2+2
\ 00000046 C067 RJMP ??TWI_ISR_5
25 {
26 if(index_RW == 0)
\ 00000048 2300 TST R16
\ 0000004A F529 BRNE ??TWI_ISR_6
27 {
28 TWDR = s;
\ 0000004C 9320.... STS _A_TWDR, R18
29 s&=69;
\ 00000050 7425 ANDI R18, 0x45
30
31
32 out.shadow.X1 = pos.X1; /* !!!!!!!!!!!!!!! */
\ 00000052 9100.... LDS R16, pos
\ 00000056 9300.... STS (`out` + 1), R16
33 out.shadow.Y1 = pos.Y1; /* !!!!!!!!!!!!!!!!!! */
\ 0000005A 9100.... LDS R16, (pos + 1)
\ 0000005E 9300.... STS (`out` + 2), R16
34 out.shadow.X2 = pos.X2; /* !!!!!!!!!!!!!!!!!!*/
\ 00000062 9100.... LDS R16, (pos + 2)
\ 00000066 9300.... STS (`out` + 3), R16
35 out.shadow.Y2 = pos.Y2; /* !!!!!!!!!!!!!!!!! */
\ 0000006A 9100.... LDS R16, (pos + 3)
\ 0000006E 9300.... STS (`out` + 4), R16
36
37 out.shadow.X1Size = pos.X1Size; /* !!!!!!!!!!!!!!! */
\ 00000072 9100.... LDS R16, (pos + 4)
\ 00000076 9300.... STS (`out` + 5), R16
38 out.shadow.Y1Strength = pos.Y1Strength; /* !!!!!!!!!!!!!!! */
\ 0000007A 9100.... LDS R16, (pos + 5)
\ 0000007E 9300.... STS (`out` + 6), R16
39 out.shadow.X2Size = pos.X2Size; /* !!!!!!!!!!!!!!! */
\ 00000082 9100.... LDS R16, (pos + 6)
\ 00000086 9300.... STS (`out` + 7), R16
40 out.shadow.Y2Strength = pos.Y2Strength; /* !!!!!!!!!!!!!!! */
\ 0000008A 9100.... LDS R16, (pos + 7)
\ 0000008E 9300.... STS (`out` + 8), R16
41
42 index_RW++;
\ ??TWI_ISR_7:
\ 00000092 E001 LDI R16, 1
\ 00000094 C040 RJMP ??TWI_ISR_5
43 }
44 else if(index_RW < 8)
\ ??TWI_ISR_6:
\ 00000096 3008 CPI R16, 8
\ 00000098 F448 BRCC ??TWI_ISR_8
45 {
46 pointer = (uint8_t*)(&out) + index_RW;
47 TWDR = *pointer;
\ 0000009A E0F0 LDI R31, 0
\ 0000009C 2FE0 MOV R30, R16
\ 0000009E .... SUBI R30, LOW((-(`out`) & 0xFFFF))
\ 000000A0 .... SBCI R31, (-(`out`) & 0xFFFF) >> 8
\ ??TWI_ISR_9:
\ 000000A2 8110 LD R17, Z
\ 000000A4 9310.... STS _A_TWDR, R17
48 index_RW++;
\ ??TWI_ISR_10:
\ 000000A8 9503 INC R16
\ 000000AA C035 RJMP ??TWI_ISR_5
49 }
50 else if(index_RW < 12)
\ ??TWI_ISR_8:
\ 000000AC 300C CPI R16, 12
\ 000000AE F450 BRCC ??TWI_ISR_11
51 {
52 if (index_RW & 1)
\ 000000B0 FB00 BST R16, 0
\ 000000B2 F41E BRTC ??TWI_ISR_12
53 {
54 pointer = (uint8_t*)(®.reference) + (index_RW - 55);
\ 000000B4 .... LDI R30, LOW((reg + 41))
\ 000000B6 .... LDI R31, HIGH((reg + 41))
\ 000000B8 C002 RJMP ??TWI_ISR_13
55 }
56 else
57 {
58 pointer = (uint8_t*)(®.rawSignal) + (index_RW - 24);
\ ??TWI_ISR_12:
\ 000000BA .... LDI R30, LOW((reg - 24))
\ 000000BC .... LDI R31, HIGH((reg - 24))
\ ??TWI_ISR_13:
\ 000000BE 0FE0 ADD R30, R16
\ 000000C0 1FF5 ADC R31, R21
59 }
60
61 TWDR = *pointer;
\ 000000C2 CFEF RJMP ??TWI_ISR_9
62 index_RW++;
63 }
64 else
65 {
66 TWDR = 34;
\ ??TWI_ISR_11:
\ 000000C4 E212 LDI R17, 34
\ 000000C6 9310.... STS _A_TWDR, R17
\ 000000CA C025 RJMP ??TWI_ISR_5
67 }
68 }
69 else
70 {
71 flagGoTo_IDLE++;
72 }
73
74 break;
75 }
76
77 case 3: {
78
79 if (status_TWI == 70)
\ ??TWI_ISR_2:
\ 000000CC 3416 CPI R17, 70
\ 000000CE F431 BRNE ??TWI_ISR_14
80 {
81 index_RW = indexADDR;
\ 000000D0 9100.... LDS R16, indexADDR
82 TWDR = index_RW;
\ 000000D4 9300.... STS _A_TWDR, R16
83
84 stateI2C = 88;
\ 000000D8 E518 LDI R17, 88
\ 000000DA C01B RJMP ??TWI_ISR_15
85 }
86 else if(status_TWI == 39)
\ ??TWI_ISR_14:
\ 000000DC 3217 CPI R17, 39
\ 000000DE F4D9 BRNE ??TWI_ISR_5
87 {
88
89 stateI2C = 55;
\ 000000E0 E317 LDI R17, 55
\ 000000E2 C017 RJMP ??TWI_ISR_15
90 }
91 else
92 {
93 }
94 break;
95 }
96
97 case 4: {
98
99 if (status_TWI == 75)
\ ??TWI_ISR_3:
\ 000000E4 341B CPI R17, 75
\ 000000E6 F4B9 BRNE ??TWI_ISR_5
100 {
101
102 if(index_RW == 0)
\ 000000E8 2300 TST R16
\ 000000EA F419 BRNE ??TWI_ISR_16
103 {
104 s&= data_TWI | 45;
\ 000000EC 623D ORI R19, 0x2D
\ 000000EE 2323 AND R18, R19
105 index_RW++;
\ 000000F0 CFD0 RJMP ??TWI_ISR_7
106 }
107 else if (index_RW < 51)
\ ??TWI_ISR_16:
\ 000000F2 3303 CPI R16, 51
\ 000000F4 F2C8 BRCS ??TWI_ISR_10
108 {
109 index_RW++;
110 }
111 else if (index_RW <= 56)
\ 000000F6 3309 CPI R16, 57
\ 000000F8 F470 BRCC ??TWI_ISR_5
112 {
113 pointer = (uint8_t*)(&out) + index_RW;
114 *pointer = data_TWI;
\ 000000FA E0F0 LDI R31, 0
\ 000000FC 2FE0 MOV R30, R16
\ 000000FE .... SUBI R30, LOW((-(`out`) & 0xFFFF))
\ 00000100 .... SBCI R31, (-(`out`) & 0xFFFF) >> 8
\ 00000102 8330 ST Z, R19
115 index_RW++;
\ 00000104 CFD1 RJMP ??TWI_ISR_10
116 }
117 else
118 {
119 }
120 }
121 else
122 {
123 flagGoTo_IDLE++;
124 }
125
126 break;
127 }
128
129 case 5: {
130
131 if (status_TWI == 67)
\ ??TWI_ISR_4:
\ 00000106 3413 CPI R17, 67
\ 00000108 F431 BRNE ??TWI_ISR_5
132 {
133 indexADDR = index_RW = data_TWI;
\ 0000010A 2F03 MOV R16, R19
\ 0000010C 9330.... STS indexADDR, R19
134 stateI2C = 45;
\ 00000110 E21D LDI R17, 45
\ ??TWI_ISR_15:
\ 00000112 9310.... STS (indexADDR + 2), R17
135 }
136 break;
137 }
138 }
139 TWCR = 12;
\ ??TWI_ISR_5:
\ 00000116 E01C LDI R17, 12
\ 00000118 9310.... STS _A_TWCR, R17
140 } while (TWCR_TWINT);
\ 0000011C 9110.... LDS R17, _A_TWCR
\ 00000120 FD17 SBRC R17, 7
\ 00000122 CF7D RJMP ??TWI_ISR_0
141 out.status = s;
\ 00000124 9320.... STS `out`, R18
142 _index_RW=index_RW;
\ 00000128 9300.... STS (indexADDR + 1), R16
143 }
\ 0000012C BF6F OUT 0x3F, R22
\ 0000012E 9109 LD R16, Y+
\ 00000130 9119 LD R17, Y+
\ 00000132 9129 LD R18, Y+
\ 00000134 9139 LD R19, Y+
\ 00000136 9149 LD R20, Y+
\ 00000138 9159 LD R21, Y+
\ 0000013A 9169 LD R22, Y+
\ 0000013C 91E9 LD R30, Y+
\ 0000013E 91F9 LD R31, Y+
\ 00000140 9518 RETI
Основная идея в том, что статические переменные загрузить в их локальные копии (в начале процедуры), а потом выгрузить (в конце процедуры). В некоторых случаях это лишнее (например, доступ к indexADDR явно не надо так оформлять, у него одно считывание и одна запись, однако, немного поправил в месте записи - indexADDR = index_RW = data_TWI).
Стало заметно веселее - компилятор перестал пользоваться регистровой парой X.
