?? 26.lst
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C51 COMPILER V7.09 26 03/22/2005 10:03:29 PAGE 1
C51 COMPILER V7.09, COMPILATION OF MODULE 26
OBJECT MODULE PLACED IN 26.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE 26.c BROWSE DEBUG OBJECTEXTEND
line level source
1 //------------------------------------------------------------------------------
2 // Keil Software, Inc.
3 //
4 // Project: Cygnal 8051F000 I2C Example Program
5 //
6 // Filename: Cygnal_I2C_Example_Program.c
7 // Version: 1.0.0
8 // Description: This file contains example code that will communicate to a
9 // serial EEPROM using I2C. Data will be printed over the
10 // serial port.
11 //
12 // Copyright 2000 - Keil Software, Inc.
13 // All rights reserved.
14 //------------------------------------------------------------------------------
15
16 //------------------------------------------------------------------------------
17 // Header files
18 //------------------------------------------------------------------------------
19 #include <REG51F0X0.H> // Header file for the Cygnal 8051F0X0
20 #include <STDIO.H> // Header file for standard I/O
21
22 //------------------------------------------------------------------------------
23 // Value Definitions
24 //------------------------------------------------------------------------------
25 #define TRUE 0x01 // Value representing TRUE
26 #define FALSE 0x00 // Value representing FALSE
27 #define ON 0x01 // Value representing ON
28 #define OFF 0x00 // Value representing OFF
29 #define HIGH 0x01 // Value representing ON
30 #define LOW 0x00 // Value representing OFF
31
32 #define DELAY_WRITE 5000 // approx. 5 ms delay write time (about 1000 cycles / ms)
33 #define DELAY_BLINK 50000 // Value for delay time - blink
34
35 //------------------------------------------------------------------------------
36 // Macros
37 //------------------------------------------------------------------------------
38 // Get high byte macro
39 #define high_byte(x) ((x & 0xFF00) >> 8)
40
41 //------------------------------------------------------------------------------
42 // I/O Port Defines
43 //------------------------------------------------------------------------------
44 sbit P1_6 = 0x96; // Define the individual bit (P1.6)
45 #define LED P1_6 // The eval board has an LED on P1.6
46
47 //------------------------------------------------------------------------------
48 // I2C Bus (SMBus) register bit definitions
49 //------------------------------------------------------------------------------
50 sbit BUS_BUSY = 0xC7; // SM Bus Busy (bit 7)
51 sbit BUS_EN = 0xC6; // SM Bus Enable (bit 6)
52 sbit BUS_START = 0xC5; // SM Bus Start (bit 5)
53 sbit BUS_STOP = 0xC4; // SM Bus Stop (bit 4)
54 sbit BUS_INT = 0xC3; // SM Bus Interrupt (bit 3)
55 sbit BUS_AA = 0xC2; // SM Bus ACK (bit 2)
C51 COMPILER V7.09 26 03/22/2005 10:03:29 PAGE 2
56 sbit BUS_FTE = 0xC1; // SM Bus Clock timeout - high (bit 1)
57 sbit BUS_TOE = 0xC0; // SM Bus Clock timeout - low (bit 0)
58
59 //------------------------------------------------------------------------------
60 // Rerserve Interrupt vector space (the 8051F000 has an IV table from 0x03 to 0xAB)
61 //------------------------------------------------------------------------------
62 unsigned char code iv_table [0xB0] _at_ 0x0003;
63
64 //------------------------------------------------------------------------------
65 // Function Prototypes
66 //------------------------------------------------------------------------------
67 void write_byte (unsigned char data_out, unsigned int address);
68 unsigned char read_byte (unsigned int address);
69 void i2c_write (unsigned char output_data);
70 unsigned char i2c_read (void);
71 void delay_time (unsigned int time_end);
72 void i2c_start (void);
73 unsigned char i2c_stop_and_read (void);
74 void repeated_i2c_start_and_write (unsigned char output_data);
75 void i2c_stop_and_write (unsigned char output_data);
76
77 //------------------------------------------------------------------------------
78 // MAIN FUNCTION
79 //------------------------------------------------------------------------------
80 void main (void)
81 {
82 1 unsigned int eeprom_address;
83 1 unsigned char eeprom_data;
84 1
85 1 // Disable the WDT (page 93 of data sheet)
86 1 WDTCN = 0xDE;
87 1 WDTCN = 0xAD;
88 1
89 1 // Set internal oscilator to 16 MHz - Startup is 2 MHz (page 98 of data sheet)
90 1 OSCICN = 0x07;
91 1
92 1
93 1 // On the Cygnal processor there is a "Crossover" network that must
94 1 // be initialized to establish the port pin assignements
95 1 // (see page 101 of the data sheet)
96 1 XBR0 = 0x05; // Set UART and SMBus to be enabled
97 1 XBR1 = 0x00; // No functions routed in this register
98 1 XBR2 = 0x40; // Pull-ups enabled, XBAR enabled, no ADC
99 1
100 1 PRT1CF = 0x40; // Set port 1.6 to push/pull
101 1 // (i.e the LED on the Eval board)
102 1
103 1 // Initialize the serial port (9600, 8, N, 1)
104 1 PCON &= 0x7F; // Clear bit 7 of the PCON register (SMOD1 = 0)
105 1 SCON = 0x50; // 0101,0000 (Mode 1 and RxD enable)
106 1 CKCON = 0x10; // Make T1M 1 (i.e. SysClk for Timer 1 not / by 12)
107 1 // (see page 141 of the data sheet)
108 1
109 1 TMOD |= 0x20; // Timer #1 in autoreload 8 bit mode
110 1 TCON |= 0x40; // Set Timer #1 to run mode (TR = 1)
111 1 TH1 = 0xCC; // Baud rate is determined by
112 1 // Timer #1 overflow rate
113 1 // Baud Rate = (Fcpu / 32) / (256 - TH1)
114 1 // Fcpu = 16.00 MHz (see above setting of osc.)
115 1 // TH1 = 252
116 1 // (see page 130 of the data sheet)
117 1
C51 COMPILER V7.09 26 03/22/2005 10:03:29 PAGE 3
118 1 SCON |= 0x02; // Set UART to send first char (TI = 1)
119 1
120 1
121 1 // Initialize the I2C Bus (SMBus)
122 1 // (see page 111)
123 1 SMB0CR = 0x60; // Set the clock to approx. 10 uS TH, TL (50 kHz)
124 1 // (see page 117 of the data sheet)
125 1 BUS_EN = TRUE; // Enable the bus
126 1
127 1
128 1 printf("\n\rKeil Software, Inc.\n\r"); // Display starup message
129 1 printf("8051F0X0 MCU I睠 Example Test Program\n\r");
130 1 printf("Version 1.0.0\n\r");
131 1 printf("Copyright 2000 - Keil Software, Inc.\n\r");
132 1 printf("All rights reserved.\n\n\r");
133 1
134 1 printf("Writing data to EEPROM....");
135 1
136 1 for (eeprom_address = 0; eeprom_address < 75; eeprom_address++)
137 1 write_byte((unsigned char)eeprom_address + 0x30, eeprom_address);
138 1
139 1 printf("Done!\r\n\n");
140 1
141 1
142 1 while (TRUE)
143 1 {
144 2 for (eeprom_address = 0; eeprom_address < 75; eeprom_address++)
145 2 {
146 3 // Read data from eeprom and display it
147 3 eeprom_data = read_byte(eeprom_address);
148 3 printf("Address: %3u Character: %c\n\r", eeprom_address, eeprom_data);
149 3
150 3 LED = HIGH; // Blink LED with delay
151 3 delay_time(DELAY_BLINK);
152 3
153 3 LED = LOW;
154 3 delay_time(DELAY_BLINK);
155 3 }
156 2 }
157 1 }
158
159 //------------------------------------------------------------------------------
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