📄 i2c.lst
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A51 MACRO ASSEMBLER I2C 12/18/2007 11:18:07 PAGE 1
MACRO ASSEMBLER A51 V7.07
OBJECT MODULE PLACED IN i2c.OBJ
ASSEMBLER INVOKED BY: C:\Keil\C51\BIN\A51.EXE i2c.asm SET(SMALL) DEBUG EP
LOC OBJ LINE SOURCE
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44 EPM_WR_CODE_SEG SEGMENT CODE
45 ;public ?C?CSTPTR
46
47
48 ;XX #define TEST
49
50 PUBLIC MOVX_A_DPTR
51 PUBLIC MOVX_DPTR_A
52 public SendStopCondition
53
54 PUBLIC is_reading
55 PUBLIC is_writing
56 PUBLIC epm_err
57 PUBLIC addr_low
58 PUBLIC addr_high
A51 MACRO ASSEMBLER I2C 12/18/2007 11:18:07 PAGE 2
59
60 $reguse MOVX_A_DPTR(A)
61 $reguse MOVX_DPTR_A()
62 $reguse SendStopCondition()
63
64
65 ;-------------- PIN DEFINITION ---------------------------
66 ;EPM_SDA EQU P2.1
67 extrn bit(EPM_SDA)
68 ;EPM_SCL EQU P2.2
69 extrn bit(EPM_SCL)
70 ;if this updated, update eprom.h
71 ;EPM_WP EQU P2.3
72 extrn bit(EPM_WP)
73 ;enable_task_switch EQU P2.4
74 extrn bit(enable_task_switch)
75
76 ;-------------- EPROM PARAMETER DEFINITION ---------------
77 ;FOR 24C32
0020 78 PAGE_SIZE EQU 20H
79 ;about 15ms @18.432MHz
00FA 80 WAIT_WRITE_COUNT EQU 250
81
82 ;-------------- IMPORTED VARIABLES --------------------------------
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92 EPM_BITS SEGMENT BIT
---- 93 RSEG EPM_BITS
0000 94 is_reading:
0000 95 DBIT 1
0001 96 is_writing:
0001 97 DBIT 1
0002 98 epm_err:
0002 99 DBIT 1
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101 EPM_DATA SEGMENT data
---- 102 rseg EPM_DATA
0000 103 addr_low:
0000 104 DS 1
0001 105 addr_high:
0001 106 DS 1
107
108
109 ;-------------- PROGRAM -------------------------------------------
---- 110 RSEG EPM_WR_CODE_SEG
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A51 MACRO ASSEMBLER I2C 12/18/2007 11:18:07 PAGE 4
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199 ;-------------------- macro : Increment address --------------------
200 IncrementAddress Macro first_return_addr
201 INC addr_low
202 MOV A,addr_low
203 JNZ first_return_addr
204 INC addr_high
205 endm
206
207
208 ;-------------------- macro : Compare address --------------------
209
210 CompareAddress Macro RETURN_NOT_EQUAL,RETURN_EQUAL
211 MOV A,DPL
212 CJNE A, addr_low, RETURN_NOT_EQUAL
213 MOV A, DPH
214 CJNE A, addr_high, RETURN_NOT_EQUAL
215 SJMP RETURN_EQUAL
216 ENDM
217
218
219 ;-------------------- macro : Write control code --------------------
220 ;如果EPROM正在写，那么就会不响应。因此要尝试 WAIT_WRITE_COUNT次。
221 ;如果已经检测出 EPROM 有错误，那么就只尝试一次。如果尝试成功，则该标志被清除。
222
223 ;WriteControlCode Macro control_code, failure_return_addr
0000 224 WriteControlCode:
225 ; LOCAL WE_WRITE_CONTROL_CODE, WE_NEXT_CONTROL_CODE
226
0000 7500FA F 227 MOV addr_low, #WAIT_WRITE_COUNT ; addr_low is used as loop count
228 ;如果EPROM 错误，则只尝试一次
0003 300003 F 229 JNB epm_err, WE_WRITE_CONTROL_CODE
0006 750001 F 230 MOV addr_low, #1
0009 231 WE_WRITE_CONTROL_CODE:
0009 C200 F 232 CLR epm_err
000B 120000 F 233 LCALL SendStartcondition
000E 74A0 234 MOV A, #0XA0 ;control_code;//control code 0xa0, write
0010 120000 F 235 LCALL WriteByte;
0013 300005 F 236 JNB epm_err, WE_NEXT_CONTROL_CODE
0016 D500F0 F 237 DJNZ addr_low, WE_WRITE_CONTROL_CODE ;loop end
0019 800E 238 SJMP WCC_RET ;failure_return_addr ; fail
001B 239 WE_NEXT_CONTROL_CODE:
001B E583 240 MOV A, DPH ;//high address
001D F500 F 241 MOV addr_high,A
001F 120000 F 242 LCALL WriteByte
0022 E582 243 MOV A,DPL
0024 F500 F 244 MOV addr_low,A
0026 120000 F 245 LCALL WriteByte
0029 246 WCC_RET:
0029 22 247 RET
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