📄 i2c.lst
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C51 COMPILER V6.23a I2C 12/20/2002 12:46:27 PAGE 1
C51 COMPILER V6.23a, 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
3 //------------------------------------------------------------------------------------
4 // Global CONSTANTS
5 //------------------------------------------------------------------------------------
6
7 #define WRITE 0x00 // SMBus WRITE command
8 #define READ 0x01 // SMBus READ command
9
10 // Device addresses (7 bits, lsb is a don't care)
11 #define CLOCK3530_ADDRESS_RESET 0x60 //1 ack
12 #define CLOCK3530_ADDRESS_STATUS 0x62 //2 ack
13 #define CLOCK3530_ADDRESS_DATEHOUR 0x64 //8 ack year month day week hour minute second
14 #define CLOCK3530_ADDRESS_HOUR 0x66 //4 ack hour minute second
15 #define CLOCK3530_ADDRESS_INT1 0x68 //3 ack
16 #define CLOCK3530_ADDRESS_INT2 0x6A //3 ack
17
18 union
19 {
20 unsigned char ClockString[7];
21 struct RealClock
22 {
23 unsigned char Year,Month,Day,Week,Hour,Minute,Second;
24 } RT;
25 } RealTime;
26
27
28 // SMBus states:
29 // MT = Master Transmitter
30 // MR = Master Receiver
31 #define SMB_BUS_ERROR 0x00 // (all modes) BUS ERROR
32 #define SMB_START 0x08 // (MT & MR) START transmitted
33 #define SMB_RP_START 0x10 // (MT & MR) repeated START
34 #define SMB_MTADDACK 0x18 // (MT) Slave address + W transmitted;
35 // ACK received
36 #define SMB_MTADDNACK 0x20 // (MT) Slave address + W transmitted;
37 // NACK received
38 #define SMB_MTDBACK 0x28 // (MT) data byte transmitted; ACK rec'vd
39 #define SMB_MTDBNACK 0x30 // (MT) data byte transmitted; NACK rec'vd
40 #define SMB_MTARBLOST 0x38 // (MT) arbitration lost
41 #define SMB_MRADDACK 0x40 // (MR) Slave address + R transmitted;
42 // ACK received
43 #define SMB_MRADDNACK 0x48 // (MR) Slave address + R transmitted;
44 // NACK received
45 #define SMB_MRDBACK 0x50 // (MR) data byte rec'vd; ACK transmitted
46 #define SMB_MRDBNACK 0x58 // (MR) data byte rec'vd; NACK transmitted
47
48
49 //-----------------------------------------------------------------------------------
50 //Global VARIABLES
51 //-----------------------------------------------------------------------------------
52 char COMMAND; // Holds the slave address + R/W bit for use in the SMBus ISR.
53
54 unsigned char *I2CDataBuff;
55
C51 COMPILER V6.23a I2C 12/20/2002 12:46:27 PAGE 2
56 char BYTE_NUMBER; // Used by ISR to check what data has just been
57 // sent - High address byte, Low byte, or data byte
58
59 unsigned char HIGH_ADD, LOW_ADD; // High & Low byte for EEPROM memory address
60
61 bit SM_BUSY; // This bit is set when a send or receive
62 // is started. It is cleared by the
63 // ISR when the operation is finished.
64
65
66 //------------------------------------------------------------------------------------
67 // Function PROTOTYPES
68 //------------------------------------------------------------------------------------
69
70 void SMBus_ISR (void);
71
72 //------------------------------------------------------------------------------------
73 // MAIN Routine
74 //------------------------------------------------------------------------------------
75 //
76 // Main routine configures the crossbar and SMBus, and tests
77 // the SMBus interface between the three EEPROMs
78
79
80 void ResetRealClock(void)
81 {
82 1 while (SM_BUSY); // Wait for SMBus to be free.
83 1 SM_BUSY = 1; // Occupy SMBus (set to busy)
84 1 SMB0CN = 0x44; // SMBus enabled, ACK on acknowledge cycle
85 1 BYTE_NUMBER = 0; // 2 address bytes.
86 1 COMMAND = (CLOCK3530_ADDRESS_RESET | READ); // Chip select + READ
87 1 STA = 1; // Start transfer
88 1 while (SM_BUSY); // Wait for transfer to finish
89 1 }
90
91 //======================写S-3530A内部实时数据寄存器程序=====================
92 //功能：将设定年、月、日、星期、时、分、秒数据写入S-3530A |
93 //入口：发送数据放在年、月、日、星期、时、分、秒各寄存器 |
94 //出口：NONE |
95 //==========================================================================
96 void SetRealClock(void)
97 {
98 1 while (SM_BUSY); // Wait for SMBus to be free.
99 1 SM_BUSY = 1; // Occupy SMBus (set to busy)
100 1 SMB0CN = 0x44; // SMBus enabled, ACK on acknowledge cycle
101 1 BYTE_NUMBER = 7; // 2 address bytes.
102 1 COMMAND = (CLOCK3530_ADDRESS_DATEHOUR | WRITE); // Chip select + WRITE
103 1 I2CDataBuff = &RealTime.ClockString[0]; // Data to be writen
104 1 STA = 1; // Start transfer
105 1 }
106
107 //==================读S-3530A实时数据寄存器子程序===========================
108 //功能：从S-3530A读入当前时间数据 |
109 //入口：NONE |
110 //出口：接收数据放在年、月、日、星期、时、分、秒各寄存器 |
111 //==========================================================================
112 void GetRealClock(void)
113 {
114 1 while (SM_BUSY); // Wait for SMBus to be free.
115 1 SM_BUSY = 1; // Occupy SMBus (set to busy)
116 1 SMB0CN = 0x44; // SMBus enabled, ACK on acknowledge cycle
117 1 BYTE_NUMBER = 7; // 2 address bytes.
C51 COMPILER V6.23a I2C 12/20/2002 12:46:27 PAGE 3
118 1 COMMAND = (CLOCK3530_ADDRESS_DATEHOUR | READ); // Chip select + READ
119 1 I2CDataBuff = &RealTime.ClockString[0]; // Data to be writen
120 1 STA = 1; // Start transfer
121 1 while (SM_BUSY); // Wait for transfer to finish
122 1 }
123
124 //============================写状态寄存器程序==============================
125 //功能：读/写S-3530A状态寄存器，对S-3530A进行设置 |
126 //入口：NONE 出口：NONE |
127 //==========================================================================
128 unsigned char GetRealClockStatus(void)
129 {
130 1 unsigned char result;
131 1 while (SM_BUSY); // Wait for SMBus to be free.
132 1 SM_BUSY = 1; // Occupy SMBus (set to busy)
133 1 SMB0CN = 0x44; // SMBus enabled, ACK on acknowledge cycle
134 1 BYTE_NUMBER = 1;
135 1 COMMAND = (CLOCK3530_ADDRESS_STATUS | READ);
136 1 I2CDataBuff = &result;
137 1 STA = 1; // Start transfer
138 1 while (SM_BUSY); // Wait for transfer to finish
139 1 return result;
140 1 }
141 void SetRealClockStatus(unsigned char status)
142 {
143 1 while (SM_BUSY); // Wait for SMBus to be free.
144 1 SM_BUSY = 1; // Occupy SMBus (set to busy)
145 1 SMB0CN = 0x44; // SMBus enabled, ACK on acknowledge cycle
146 1 BYTE_NUMBER = 1;
147 1 COMMAND = (CLOCK3530_ADDRESS_STATUS | WRITE);
148 1 I2CDataBuff = &status;
149 1 STA = 1; // Start transfer
150 1 }
151 /*
152 void SetRealClockINT1(unsigned int Int1)
153 {
154 while (SM_BUSY); // Wait for SMBus to be free.
155 SM_BUSY = 1; // Occupy SMBus (set to busy)
156 SMB0CN = 0x44; // SMBus enabled, ACK on acknowledge cycle
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