?? tlight_a.lst
字號(hào):
C51 COMPILER V6.10 TLIGHT_A 04/18/2001 16:53:03 PAGE 1
C51 COMPILER V6.10, COMPILATION OF MODULE TLIGHT_A
OBJECT MODULE PLACED IN .\TLIGHT_A.OBJ
COMPILER INVOKED BY: C:\KEIL\C51\BIN\C51.EXE .\TLIGHT_A.C BROWSE DEBUG OBJECTEXTEND
stmt level source
1 /*------------------------------------------------------------------*-
2
3 TLight_A.C (v1.00)
4
5 ------------------------------------------------------------------
6
7 Traffic light control program
8
9 Simplex version
10 - has no information about bulb status on other node.
11
12
13 COPYRIGHT
14 ---------
15
16 This code is from the book:
17
18 PATTERNS FOR TIME-TRIGGERED EMBEDDED SYSTEMS by Michael J. Pont
19 [Pearson Education, 2001; ISBN: 0-201-33138-1].
20
21 This code is copyright (c) 2001 by Michael J. Pont.
22
23 See book for copyright details and other information.
24
25 -*------------------------------------------------------------------*/
26
27 #include "Main.h"
28 #include "Port.h"
29
30 #include "TLight_A.h"
31
32 // ------ Private constants ----------------------------------------
33
34 // Easy to change logic here
35 #define ON 0
36 #define OFF 1
37
38 // Times in each of the (four) possible light states
39 // (Times are in seconds - must call the update task once per second)
40 //
41 #define RED_DURATION (10)
42 #define RED_AND_AMBER_DURATION (10)
43
44 // NOTE:
45 // GREEN_DURATION must equal RED_DURATION
46 // AMBER_DURATION must equal RED_AND_AMBER_DURATION
47 #define GREEN_DURATION RED_DURATION
48 #define AMBER_DURATION RED_AND_AMBER_DURATION
49
50 // Must specify whether this is a MASTER or a SLAVE unit
51 #define MASTER_SLAVE SLAVE
52
53 // ------ Private variables ----------------------------------------
54
55 // The state of the system
C51 COMPILER V6.10 TLIGHT_A 04/18/2001 16:53:03 PAGE 2
56 static eLight_State Light_state_G;
57
58 // ------ Private function prototypes ------------------------------
59
60 bit TRAFFIC_LIGHTS_Check_Local_Bulb(void);
61
62 /*------------------------------------------------------------------*-
63
64 TRAFFIC_LIGHTS_Init()
65
66 Prepare for scheduling.
67
68 -*-----------------------------------------------------------------*/
69 void TRAFFIC_LIGHTS_Init(void)
70 {
71 1 // Master and slave must start in opposite states
72 1 if (MASTER_SLAVE == MASTER)
73 1 {
74 2 Light_state_G = RED;
75 2 }
76 1 else
77 1 {
78 2 Light_state_G = GREEN;
79 2 }
80 1
81 1 // Display safe output until scheduler starts
82 1 TRAFFIC_LIGHTS_Display_Safe_Output();
83 1 }
84
85 /*------------------------------------------------------------------*-
86
87 TRAFFIC_LIGHTS_Update()
88
89 Must be scheduled once per second.
90
91 -*------------------------------------------------------------------*/
92 void TRAFFIC_LIGHTS_Update(void)
93 {
94 1 static tWord Time_in_state;
95 1
96 1 // Check for blown bulbs on this node
97 1 TRAFFIC_LIGHTS_Check_Local_Bulb();
98 1
99 1 // This is the main update code
100 1 switch (Light_state_G)
101 1 {
102 2 case RED:
103 2 {
104 3 Red_light = ON;
105 3 Amber_light = OFF;
106 3 Green_light = OFF;
107 3
108 3 if (++Time_in_state == RED_DURATION)
109 3 {
110 4 Light_state_G = RED_AMBER;
111 4 Time_in_state = 0;
112 4 }
113 3
114 3 break;
115 3 }
116 2
117 2 case RED_AMBER:
C51 COMPILER V6.10 TLIGHT_A 04/18/2001 16:53:03 PAGE 3
118 2 {
119 3 Red_light = ON;
120 3 Amber_light = ON;
121 3 Green_light = OFF;
122 3
123 3 if (++Time_in_state == RED_AND_AMBER_DURATION)
124 3 {
125 4 Light_state_G = GREEN;
126 4 Time_in_state = 0;
127 4 }
128 3
129 3 break;
130 3 }
131 2
132 2 case GREEN:
133 2 {
134 3 Red_light = OFF;
135 3 Amber_light = OFF;
136 3 Green_light = ON;
137 3
138 3 if (++Time_in_state == GREEN_DURATION)
139 3 {
140 4 Light_state_G = AMBER;
141 4 Time_in_state = 0;
142 4 }
143 3
144 3 break;
145 3 }
146 2
147 2 case AMBER:
148 2 {
149 3 Red_light = OFF;
150 3 Amber_light = ON;
151 3 Green_light = OFF;
152 3
153 3 if (++Time_in_state == AMBER_DURATION)
154 3 {
155 4 Light_state_G = RED;
156 4 Time_in_state = 0;
157 4 }
158 3
159 3 break;
160 3 }
161 2
162 2 case BULB_BLOWN:
163 2 {
164 3 // Blown bulb detected
165 3 // Switch all bulbs off
166 3 // (Drivers won't be happy, but it will be clear
167 3 // that something is wrong)
168 3 Red_light = OFF;
169 3 Amber_light = OFF;
170 3 Green_light = OFF;
171 3
172 3 // We remain in this state until state
173 3 // is changed manually, or system is reset
174 3 break;
175 3 }
176 2 }
177 1 }
178
179 /*------------------------------------------------------------------*-
C51 COMPILER V6.10 TLIGHT_A 04/18/2001 16:53:03 PAGE 4
180
181 TRAFFIC_LIGHTS_Check_Local_Bulb()
182
183 Check the status of the local bulbs (DUMMY FUNCTION HERE)
184
185 -*------------------------------------------------------------------*/
186 bit TRAFFIC_LIGHTS_Check_Local_Bulb(void)
187 {
188 1 // This dummy function confirms the bulbs are OK
189 1 //
190 1 // - See Chapter 32 for further info.
191 1 return RETURN_NORMAL;
192 1 }
193
194 /*------------------------------------------------------------------*-
195
196 TRAFFIC_LIGHTS_Display_Safe_Output()
197
198 Used in the event of system failure, etc.
199
200 -*------------------------------------------------------------------*/
201 void TRAFFIC_LIGHTS_Display_Safe_Output(void)
202 {
203 1 if (TRAFFIC_LIGHTS_Check_Local_Bulb() == RETURN_NORMAL)
204 1 {
205 2 // Bulbs are OK
206 2 // - best thing to do is to display STOP
207 2 Red_light = ON;
208 2 Amber_light = OFF;
209 2 Green_light = OFF;
210 2 }
211 1 else
212 1 {
213 2 // At least one bulb has blown
214 2 // - best thing we can do is extinguish all bulbs
215 2 Red_light = OFF;
216 2 Amber_light = OFF;
217 2 Green_light = OFF;
218 2 }
219 1 }
220
221 /*------------------------------------------------------------------*-
222 ---- END OF FILE -------------------------------------------------
223 -*------------------------------------------------------------------*/
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 166 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = 3 ----
IDATA SIZE = ---- ----
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
?? 快捷鍵說(shuō)明
復(fù)制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號(hào)
Ctrl + =
減小字號(hào)
Ctrl + -