📄 i2c.lst
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C51 COMPILER V6.12 I2C 05/24/2006 15:23:18 PAGE 1
C51 COMPILER V6.12, COMPILATION OF MODULE I2C
OBJECT MODULE PLACED IN I2C.OBJ
COMPILER INVOKED BY: c:\KEIL\C51\BIN\C51.exe I2C.c DB OE
stmt level source
1 #include <c8051f020.h> // SFR declarations
2 #include "INTRINS.H"
3
4 //------------------------------------------------------------------------------------
5 // Global CONSTANTS
6 //------------------------------------------------------------------------------------
7
8 #define WRITE 0x00 // SMBus WRITE command
9 #define READ 0x01 // SMBus READ command
10
11 // Device addresses (7 bits, lsb is a don't care)
12 #define CLOCK3530_ADDRESS_RESET 0x60 //1 ack
13 #define CLOCK3530_ADDRESS_STATUS 0x62 //2 ack
14 #define CLOCK3530_ADDRESS_DATEHOUR 0x64 //8 ack year month day week hour minute second
15 #define CLOCK3530_ADDRESS_HOUR 0x66 //4 ack hour minute second
16 #define CLOCK3530_ADDRESS_INT1 0x68 //3 ack
17 #define CLOCK3530_ADDRESS_INT2 0x6A //3 ack
18
19 union
20 {
21 unsigned char ClockString[7];
22 struct RealClock
23 {
24 unsigned char Year,Month,Day,Week,Hour,Minute,Second;
25 } RT;
26 } RealTime;
27
28
29 // SMBus states:
30 // MT = Master Transmitter
31 // MR = Master Receiver
32 #define SMB_BUS_ERROR 0x00 // (all modes) BUS ERROR
33 #define SMB_START 0x08 // (MT & MR) START transmitted
34 #define SMB_RP_START 0x10 // (MT & MR) repeated START
35 #define SMB_MTADDACK 0x18 // (MT) Slave address + W transmitted;
36 // ACK received
37 #define SMB_MTADDNACK 0x20 // (MT) Slave address + W transmitted;
38 // NACK received
39 #define SMB_MTDBACK 0x28 // (MT) data byte transmitted; ACK rec'vd
40 #define SMB_MTDBNACK 0x30 // (MT) data byte transmitted; NACK rec'vd
41 #define SMB_MTARBLOST 0x38 // (MT) arbitration lost
42 #define SMB_MRADDACK 0x40 // (MR) Slave address + R transmitted;
43 // ACK received
44 #define SMB_MRADDNACK 0x48 // (MR) Slave address + R transmitted;
45 // NACK received
46 #define SMB_MRDBACK 0x50 // (MR) data byte rec'vd; ACK transmitted
47 #define SMB_MRDBNACK 0x58 // (MR) data byte rec'vd; NACK transmitted
48
49
50 //-----------------------------------------------------------------------------------
51 //Global VARIABLES
52 //-----------------------------------------------------------------------------------
53 char COMMAND; // Holds the slave address + R/W bit for use in the SMBus ISR.
54
55 unsigned char *I2CDataBuff;
C51 COMPILER V6.12 I2C 05/24/2006 15:23:18 PAGE 2
56
57 char BYTE_NUMBER; // Used by ISR to check what data has just been
58 // sent - High address byte, Low byte, or data byte
59
60 unsigned char HIGH_ADD, LOW_ADD; // High & Low byte for EEPROM memory address
61
62 bit SM_BUSY; // This bit is set when a send or receive
63 // is started. It is cleared by the
64 // ISR when the operation is finished.
65
66
67 //------------------------------------------------------------------------------------
68 // Function PROTOTYPES
69 //------------------------------------------------------------------------------------
70
71 void SMBus_ISR (void);
72
73 //------------------------------------------------------------------------------------
74 // MAIN Routine
75 //------------------------------------------------------------------------------------
76 //
77 // Main routine configures the crossbar and SMBus, and tests
78 // the SMBus interface between the three EEPROMs
79
80
81 void ResetRealClock(void)
82 {
83 1 while (SM_BUSY); // Wait for SMBus to be free.
84 1 SM_BUSY = 1; // Occupy SMBus (set to busy)
85 1 SMB0CN = 0x44; // SMBus enabled, ACK on acknowledge cycle
86 1 BYTE_NUMBER = 0; // 2 address bytes.
87 1 COMMAND = (CLOCK3530_ADDRESS_RESET | READ); // Chip select + READ
88 1 STA = 1; // Start transfer
89 1 while (SM_BUSY); // Wait for transfer to finish
90 1 }
91
92 //======================写S-3530A内部实时数据寄存器程序=====================
93 //功能：将设定年、月、日、星期、时、分、秒数据写入S-3530A |
94 //入口：发送数据放在年、月、日、星期、时、分、秒各寄存器 |
95 //出口：NONE |
96 //==========================================================================
97 void SetRealClock(void)
98 {
99 1 while (SM_BUSY); // Wait for SMBus to be free.
100 1 SM_BUSY = 1; // Occupy SMBus (set to busy)
101 1 SMB0CN = 0x44; // SMBus enabled, ACK on acknowledge cycle
102 1 BYTE_NUMBER = 7; // 2 address bytes.
103 1 COMMAND = (CLOCK3530_ADDRESS_DATEHOUR | WRITE); // Chip select + WRITE
104 1 I2CDataBuff = &RealTime.ClockString[0]; // Data to be writen
105 1 STA = 1; // Start transfer
106 1 }
107
108 //==================读S-3530A实时数据寄存器子程序===========================
109 //功能：从S-3530A读入当前时间数据 |
110 //入口：NONE |
111 //出口：接收数据放在年、月、日、星期、时、分、秒各寄存器 |
112 //==========================================================================
113 void GetRealClock(void)
114 {
115 1 while (SM_BUSY); // Wait for SMBus to be free.
116 1 SM_BUSY = 1; // Occupy SMBus (set to busy)
117 1 SMB0CN = 0x44; // SMBus enabled, ACK on acknowledge cycle
C51 COMPILER V6.12 I2C 05/24/2006 15:23:18 PAGE 3
118 1 BYTE_NUMBER = 7; // 2 address bytes.
119 1 COMMAND = (CLOCK3530_ADDRESS_DATEHOUR | READ); // Chip select + READ
120 1 I2CDataBuff = &RealTime.ClockString[0]; // Data to be writen
121 1 STA = 1; // Start transfer
122 1 while (SM_BUSY); // Wait for transfer to finish
123 1 }
124
125 //============================写状态寄存器程序==============================
126 //功能：读/写S-3530A状态寄存器，对S-3530A进行设置 |
127 //入口：NONE 出口：NONE |
128 //==========================================================================
129 unsigned char GetRealClockStatus(void)
130 {
131 1 unsigned char result;
132 1 while (SM_BUSY); // Wait for SMBus to be free.
133 1 SM_BUSY = 1; // Occupy SMBus (set to busy)
134 1 SMB0CN = 0x44; // SMBus enabled, ACK on acknowledge cycle
135 1 BYTE_NUMBER = 1;
136 1 COMMAND = (CLOCK3530_ADDRESS_STATUS | READ);
137 1 I2CDataBuff = &result;
138 1 STA = 1; // Start transfer
139 1 while (SM_BUSY); // Wait for transfer to finish
140 1 return result;
141 1 }
142 void SetRealClockStatus(unsigned char status)
143 {
144 1 while (SM_BUSY); // Wait for SMBus to be free.
145 1 SM_BUSY = 1; // Occupy SMBus (set to busy)
146 1 SMB0CN = 0x44; // SMBus enabled, ACK on acknowledge cycle
147 1 BYTE_NUMBER = 1;
148 1 COMMAND = (CLOCK3530_ADDRESS_STATUS | WRITE);
149 1 I2CDataBuff = &status;
150 1 STA = 1; // Start transfer
151 1 }
152
153
154 unsigned char revolve(unsigned char val)
155 {
156 1 char i;
157 1 unsigned char val1=0;
158 1 for (i=0;i<8;i++)
159 1 {
160 2 if (val&0x1)
161 2 val1++;
162 2 val1=_crol_(val1,1);
163 2 val=_cror_(val,1);
164 2 }
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