📄 pca_9555.lst
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C51 COMPILER V8.08 PCA_9555 06/30/2007 15:23:46 PAGE 1
C51 COMPILER V8.08, COMPILATION OF MODULE PCA_9555
OBJECT MODULE PLACED IN PCA_9555.OBJ
COMPILER INVOKED BY: d:\Keil\C51\BIN\C51.EXE PCA_9555.c LARGE OPTIMIZE(9,SPEED) DEBUG OBJECTEXTEND
line level source
1 #include <reg51.h>
2 #include <intrins.h>
3 #include "common.h"
4
5
6
7 #define WriteDeviceAddress_9555 0x40
8 #define ReadDeviceAddress_9555 0x41
9 #define Commond_input0 0x00
10 #define Commond_input1 0x01
11 #define Commond_output0 0x02
12 #define Commond_output1 0x03
13 #define Commond_polarity0 0x04
14 #define Commond_polarity1 0x05
15 #define Commond_config0 0x06
16 #define Commond_config1 0x07
17 sbit PCA9555_SCL=P1^0;
18 sbit PCA9555_SDA=P1^1;
19 /*void delay_pca9555(void)
20 {
21 uchar i;
22 for(i=0;i<20;i++);
23 } */
24
25 void start_9555(void)
26 {
27 1 PCA9555_SCL=0;
28 1 PCA9555_SDA=1;
29 1 nop();
30 1 nop();
31 1 nop();
32 1 nop();
33 1 nop();
34 1 nop();
35 1
36 1 PCA9555_SCL=1;
37 1 nop();
38 1 nop();
39 1 nop();
40 1 nop();
41 1 nop();
42 1
43 1 PCA9555_SDA=0;
44 1 nop();
45 1 nop();
46 1 nop();
47 1 nop();
48 1 nop();
49 1 }
50
51 void stop_9555()
52 {
53 1 PCA9555_SCL=0;
54 1 PCA9555_SDA=0;
55 1 nop();
C51 COMPILER V8.08 PCA_9555 06/30/2007 15:23:46 PAGE 2
56 1 nop();
57 1 nop();
58 1 nop();
59 1 nop();
60 1
61 1 PCA9555_SCL=1;
62 1 nop();
63 1 nop();
64 1 nop();
65 1 nop();
66 1 nop();
67 1
68 1
69 1 PCA9555_SDA=1;
70 1 nop();
71 1 nop();
72 1 nop();
73 1 nop();
74 1 nop();
75 1 }
76
77 //发应答信号
78 void ack(void)
79 {
80 1 PCA9555_SCL=0;
81 1 nop();
82 1 nop();
83 1 PCA9555_SDA=0;
84 1 PCA9555_SCL=1;
85 1 nop();
86 1 nop();
87 1
88 1 }
89 //发非应答信号
90 void no_ack(void)
91 {
92 1 PCA9555_SCL=0;
93 1 nop();
94 1 nop();
95 1 PCA9555_SDA=1;
96 1 PCA9555_SCL=1;
97 1 nop();
98 1 nop();
99 1 }
100 //写字节
101 bit write8bit(uchar input)
102 {
103 1 uchar i;
104 1 for(i=0;i<8;i++)
105 1 {
106 2 PCA9555_SCL=0;
107 2 input=input<<1;
108 2 PCA9555_SDA=CY;
109 2 nop();
110 2 nop();
111 2 PCA9555_SCL=1;
112 2 nop();
113 2 }
114 1
115 1 PCA9555_SCL=0; //read ack
116 1 nop();
117 1 nop();
C51 COMPILER V8.08 PCA_9555 06/30/2007 15:23:46 PAGE 3
118 1 nop();
119 1 nop();
120 1 PCA9555_SCL=1;
121 1 nop();
122 1
123 1 CY=PCA9555_SDA;
124 1 if(CY)
125 1 return 0;
126 1 else
127 1 return 1;
128 1
129 1 }
130 //读字节
131 uchar pca9555_read8bit(void)
132 {
133 1 uchar data i,pcadata=0;
134 1 for(i=0;i<8;i++)
135 1 {
136 2 PCA9555_SCL=0;
137 2 nop();
138 2 pcadata=(pcadata<<1)|PCA9555_SDA;
139 2 PCA9555_SCL=1;
140 2 }
141 1
142 1 return pcadata;
143 1 }
144 //写pca9555输出寄存器
145 void writeoutput(uchar input1,uchar input2)
146 {
147 1 start_9555();
148 1 write8bit(WriteDeviceAddress_9555);
149 1 write8bit(Commond_output0);
150 1 write8bit(input1);
151 1 write8bit(input2);
152 1 stop_9555();
153 1 }
154 //写pca9555配置寄存器
155 void writeconfig(uchar input1,uchar input2)
156 {
157 1 start_9555();
158 1 write8bit(WriteDeviceAddress_9555);
159 1 write8bit(Commond_config0);
160 1 write8bit(input1);
161 1 write8bit(input2);
162 1 stop_9555();
163 1 }
164
165 void readregister(uchar data *data_pca9555) //
166 {
167 1 start_9555();
168 1 write8bit(WriteDeviceAddress_9555);
169 1 write8bit(Commond_input0);
170 1 start_9555();
171 1 write8bit(ReadDeviceAddress_9555);
172 1 data_pca9555[0]=pca9555_read8bit();
173 1 ack();
174 1 //delay_pca9555();
175 1 data_pca9555[1]=pca9555_read8bit();
176 1 no_ack();
177 1 stop_9555();
178 1
179 1 }
C51 COMPILER V8.08 PCA_9555 06/30/2007 15:23:46 PAGE 4
180 //
181 void pca9555_init(void)
182 {
183 1 writeconfig(0xff,0x00);//I/O 0为输出，I/O 1为输入
184 1 writeoutput(0x00,0xfe);//
185 1 }
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 237 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = ---- 2
IDATA SIZE = ---- ----
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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