📄 pc_o.lst
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C51 COMPILER V8.08 PC_O 06/30/2007 15:58:44 PAGE 1
C51 COMPILER V8.08, COMPILATION OF MODULE PC_O
OBJECT MODULE PLACED IN PC_O.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE PC_O.c BROWSE DEBUG OBJECTEXTEND
line level source
1 /*------------------------------------------------------------------*-
2
3 PC_O.C (v1.01)
4
5 ------------------------------------------------------------------
6
7 Core files for simple write-only PC link library for 8051 family
8 [Sends data to PC - cannot receive data from PC]
9
10 Uses the USART, and Pin 3.1 (Tx)
11
12 See text for details (Chapter 18).
13
14
15 COPYRIGHT
16 ---------
17
18 This code is from the book:
19
20 PATTERNS FOR TIME-TRIGGERED EMBEDDED SYSTEMS by Michael J. Pont
21 [Pearson Education, 2001; ISBN: 0-201-33138-1].
22
23 This code is copyright (c) 2001 by Michael J. Pont.
24
25 See book for copyright details and other information.
26
27 -*------------------------------------------------------------------*/
28
29 #include "Main.h"
30 #include "PC_O.h"
31
32 // ------ Public variable definitions ------------------------------
33
34 tByte Out_written_index_G; // Data in buffer that has been written
35 tByte Out_waiting_index_G; // Data in buffer not yet written
36
37 // ------ Public variable declarations -----------------------------
38
39 // The error code variable
40 //
41 // See Main.H for port on which error codes are displayed
42 // and for details of error codes
43 extern tByte Error_code_G;
44
45 // ------ Private constants ----------------------------------------
46
47 // The transmit buffer length
48 #define TRAN_BUFFER_LENGTH 20
49
50 // ------ Private variables ----------------------------------------
51
52 static tByte Tran_buffer[TRAN_BUFFER_LENGTH];
53
54 /*------------------------------------------------------------------*-
55
C51 COMPILER V8.08 PC_O 06/30/2007 15:58:44 PAGE 2
56 PC_LINK_O_Update()
57
58 Sends next character from the software transmit buffer
59
60 NOTE: Output-only library (Cannot receive chars)
61
62 Uses on-chip UART hardware.
63
64 -*------------------------------------------------------------------*/
65 void PC_LINK_O_Update(void)
66 {
67 1 // Deal with transmit bytes here
68 1
69 1 // Is there any data ready to send?
70 1 if (Out_written_index_G < Out_waiting_index_G)
71 1 {
72 2 PC_LINK_O_Send_Char(Tran_buffer[Out_written_index_G]);
73 2
74 2 Out_written_index_G++;
75 2 }
76 1 else
77 1 {
78 2 // No data to send - just reset the buffer index
79 2 Out_waiting_index_G = 0;
80 2 Out_written_index_G = 0;
81 2 }
82 1
83 1 }
84
85 /*------------------------------------------------------------------*-
86
87 PC_LINK_O_Write_String_To_Buffer()
88
89 Copies a (null terminated) string to the character buffer.
90 (The contents of the buffer are then passed over the serial link)
91
92 -*------------------------------------------------------------------*/
93 void PC_LINK_O_Write_String_To_Buffer(const char* const STR_PTR)
94 {
95 1 tByte i = 0;
96 1
97 1 while (STR_PTR[i] != '\0')
98 1 {
99 2 PC_LINK_O_Write_Char_To_Buffer(STR_PTR[i]);
100 2 i++;
101 2 }
102 1 }
103
104 /*------------------------------------------------------------------*-
105
106 PC_LINK_O_Write_Char_To_Buffer()
107
108 Stores a character in the 'write' buffer, ready for
109 later transmission
110
111 -*------------------------------------------------------------------*/
112 void PC_LINK_O_Write_Char_To_Buffer(const char CHARACTER)
113 {
114 1 // Write to the buffer *only* if there is space
115 1 if (Out_waiting_index_G < TRAN_BUFFER_LENGTH)
116 1 {
117 2 Tran_buffer[Out_waiting_index_G] = CHARACTER;
C51 COMPILER V8.08 PC_O 06/30/2007 15:58:44 PAGE 3
118 2 Out_waiting_index_G++;
119 2 }
120 1 else
121 1 {
122 2 // Write buffer is full
123 2 // Increase the size of TRAN_BUFFER_LENGTH
124 2 // or increase the rate at which UART 'update' function is called
125 2 // or reduce the amount of data sent to PC
126 2 Error_code_G = ERROR_USART_WRITE_CHAR;
127 2 }
128 1 }
129
130 /*------------------------------------------------------------------*-
131
132 PC_LINK_O_Send_Char()
133
134 Based on Keil sample code, with added (loop) timeouts.
135 Implements Xon / Off control.
136
137 Uses on-chip UART hardware.
138
139 -*------------------------------------------------------------------*/
140 void PC_LINK_O_Send_Char(const char CHARACTER)
141 {
142 1 tLong Timeout1 = 0;
143 1
144 1 if (CHARACTER == '\n')
145 1 {
146 2 Timeout1 = 0;
147 2 while ((++Timeout1) && (TI == 0));
148 2
149 2 if (Timeout1 == 0)
150 2 {
151 3 // usart did not respond - error
152 3 Error_code_G = ERROR_USART_TI;
153 3 return;
154 3 }
155 2
156 2 TI = 0;
157 2 SBUF = 0x0d; // output CR
158 2 }
159 1
160 1 Timeout1 = 0;
161 1 while ((++Timeout1) && (TI == 0));
162 1
163 1 if (Timeout1 == 0)
164 1 {
165 2 // usart did not respond - error
166 2 Error_code_G = ERROR_USART_TI;
167 2 return;
168 2 }
169 1
170 1 TI = 0;
171 1
172 1 SBUF = CHARACTER;
173 1 }
174
175 /*------------------------------------------------------------------*-
176 ---- END OF FILE -------------------------------------------------
177 -*------------------------------------------------------------------*/
C51 COMPILER V8.08 PC_O 06/30/2007 15:58:44 PAGE 4
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 199 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = 22 9
IDATA SIZE = ---- ----
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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