📄 loader_f02x.lst
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C51 COMPILER V7.50 LOADER_F02X 09/07/2007 14:28:22 PAGE 1
C51 COMPILER V7.50, COMPILATION OF MODULE LOADER_F02X
OBJECT MODULE PLACED IN loader_F02x.OBJ
COMPILER INVOKED BY: E:\Keil\C51\BIN\C51.EXE loader_F02x.c DB OE
line level source
1 //-----------------------------------------------------------------------------
2 // loader_F02x.c
3 //-----------------------------------------------------------------------------
4 // Copyright 2002 Cygnal Integrated Products, Inc.
5 // 交互选择性固件刷新程序，针对BTF020开发板做了程序改动；针对一些keil c语言函数做了注释说明
6 // AUTH: 钟磊
7 // DATE: 04 sep 07
8 //
9 // This program shows an example 'selective code loader' using the 'F02x. It
10 // designates the FLASH page at 0x1000 for the code loaded through the UART.
11 //
12 // Control Function:
13 //
14 // The system is controlled via the hardware UART, operating at a baud rate
15 // determined by the constant <BAUDRATE>, using Timer1 overflows as the baud
16 // rate source.
17 //
18 // Received File Type:
19 //
20 // This example receives Intel HEX files which are OMF51 (linker output files)
21 // passed through the OH51 utility in the 'CYGNAL\IDEfiles\C51\Bin' folder.
22 //
23 // Note: Because this program writes to FLASH, the MONEN pin should be tied
24 // high.
25 //
26 // Target: C8051F02x
27 // Tool chain: KEIL C51 6.03 / KEIL EVAL C51
28 //
29
30 //-----------------------------------------------------------------------------
31 // Includes
32 //-----------------------------------------------------------------------------
33 #include <c8051f020.h> // SFR declarations
34 #include <stdio.h> // printf() and getchar()
35 #include <ctype.h> // tolower() and toint()
36
37 //-----------------------------------------------------------------------------
38 // 16-bit SFR Definitions for 'F02x
39 //-----------------------------------------------------------------------------
40 sfr16 DP = 0x82; // data pointer
41 sfr16 TMR3RL = 0x92; // Timer3 reload value
42 sfr16 TMR3 = 0x94; // Timer3 counter
43 sfr16 ADC0 = 0xbe; // ADC0 data
44 sfr16 ADC0GT = 0xc4; // ADC0 greater than window
45 sfr16 ADC0LT = 0xc6; // ADC0 less than window
46 sfr16 RCAP2 = 0xca; // Timer2 capture/reload
47 sfr16 T2 = 0xcc; // Timer2
48 sfr16 RCAP4 = 0xe4; // Timer4 capture/reload
49 sfr16 T4 = 0xf4; // Timer4
50 sfr16 DAC0 = 0xd2; // DAC0 data
51 sfr16 DAC1 = 0xd5; // DAC1 data
52
53 //-----------------------------------------------------------------------------
54 // Global CONSTANTS
55 //-----------------------------------------------------------------------------
C51 COMPILER V7.50 LOADER_F02X 09/07/2007 14:28:22 PAGE 2
56 #define TRUE 1
57 #define FALSE 0
58
59 #define SYSCLK 22118400 // SYSCLK frequency in Hz
60 #define BAUDRATE 115200 // Baud rate of UART in bps
61
62 sbit LED = P2^4; // LED='1' means ON
63 sbit SW2 = P2^0; // SW2='0' 表示按键按下
64
65 //-----------------------------------------------------------------------------
66 // Reserved Memory Space
67 //-----------------------------------------------------------------------------
68
69 char reserved_memory_bank[2] _at_ 0x08;// This memory bank is used by the
70 // functions that will be loaded
71 // through the UART.
72 // The memory bank location and size
73 // are based on values from the M51 map
74 // file generated when the loaded code
75 // is linked.
76 //保留数据区的大小有待刷程序所使用的数据区
77 //大小决定，可以查看M51文件得到
78
79 //-----------------------------------------------------------------------------
80 // Function PROTOTYPES
81 //-----------------------------------------------------------------------------
82
83 void main (void);
84
85 // Support Subroutines
86 void print_menu(void);
87 void erase_flash_page(void);
88 void receive_code(void);
89 unsigned char hex2char();
90
91 // Initialization Subroutines
92 void SYSCLK_Init (void);
93 void PORT_Init (void);
94 void UART0_Init (void);
95
96 //-----------------------------------------------------------------------------
97 // Global VARIABLES
98 //-----------------------------------------------------------------------------
99
100 #define input_str_len 4 // buffer to hold characters entered
101 char input_str[input_str_len]; // at the command prompt
102
103 void (*f)(); // function pointer declaration
104
105 bit code_erased = FALSE; // flag used to indicate that the FLASH
106 // erase operation is complete
107 bit f_valid = FALSE; // flag to indicate that the FLASH
108 // programming operation is complete
109 // 标志先置零
110
111 //-----------------------------------------------------------------------------
112 // MAIN Routine
113 //-----------------------------------------------------------------------------
114
115 void main (void)
116 {
117 1
C51 COMPILER V7.50 LOADER_F02X 09/07/2007 14:28:22 PAGE 3
118 1 WDTCN = 0xde; // disable watchdog timer
119 1 WDTCN = 0xad;
120 1
121 1 PORT_Init (); // initialize crossbar and GPIO
122 1 SYSCLK_Init (); // initialize oscillator
123 1 UART0_Init (); // initialize UART0
124 1
125 1 print_menu(); // print the command menu
126 1
127 1 while (1){
128 2
129 2 printf("\nEnter a command >");
130 2 gets(input_str, input_str_len); //gets()读取的字符串，其长度没有限制，编程
131 2 //者要保证字符数组有足够大的空间，存放输入的字符串。
132 2
133 2
134 2 switch ( input_str[0] ){
135 3
136 3 case '1': erase_flash_page();
137 3 printf("\nFlash page 0x1000 has been erased.\n");
138 3 break;
139 3
140 3 case '2': printf("\nReady to receive HEX file...\n");
141 3 receive_code();
142 3 break;
143 3
144 3 case '3': if(f_valid){
145 4 f = (void code *) 0x1000;
146 4 f();
147 4 printf("\nFinished\n");
148 4 } else {
149 4 printf("\n*** No function exists at 0x1000.\n");
150 4 }
151 3 break;
152 3
153 3 case '?': print_menu();
154 3 break;
155 3
156 3 default: printf("\n*** Unknown Command.\n");
157 3 break;
158 3 }
159 2
160 2 } // end while
161 1
162 1 } // end main
163
164 //-----------------------------------------------------------------------------
165 // Support Subroutines
166 //-----------------------------------------------------------------------------
167 //-----------------------------------------------------------------------------
168 // print_menu
169 //-----------------------------------------------------------------------------
170 //
171 // This routine uses prints the command menu to the UART.
172 //
173 void print_menu(void)
174 {
175 1 printf("\nC8051F020 in application programming\n");
176 1 printf("--------------------------------------\n");
177 1 printf("1. Erase the flash page at 0x1000\n");
178 1 printf("2. Receive HEX file\n");
179 1 printf("3. Execute the function at 0x1000\n");
C51 COMPILER V7.50 LOADER_F02X 09/07/2007 14:28:22 PAGE 4
180 1 printf("?. Print Command List\n");
181 1 }
182
183 //-----------------------------------------------------------------------------
184 // hex2char
185 //-----------------------------------------------------------------------------
186 //
187 // This routine converts a two byte ascii representation of a char to an
188 // 8-bit variable;
189 //
190 unsigned char hex2char()
191 {
192 1
193 1 unsigned char retval;
194 1 char byteH, byteL;
195 1
196 1 // get a two-byte ASCII representation of a char from the UART
197 1 byteH = _getkey(); //等待一个字符（使用_getkey函数)
198 1 //函数_getkey和putchar使用片内串口来完成串行I/O
199 1 byteL = _getkey(); //这些子程序包含在C51库中，每个函数的源文件位于\C51\LIB目录下
200 1
201 1 // convert to a single 8 bit result
202 1 retval = (char) toint(byteH) * 16; //toint可重入转换一个十六进制数为一个十进制数
203 1
204 1 retval += (char) toint(byteL);
205 1 return retval;
206 1 }
207
208 //-----------------------------------------------------------------------------
209 // erase_flash_page
210 //-----------------------------------------------------------------------------
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