3 |
/////////////////////////////////////////////////////////////////////// |
/////////////////////////////////////////////////////////////////////// |
4 |
//Includes |
//Includes |
5 |
#include <pic18.h> |
#include <pic18.h> |
6 |
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#include <string.h> |
7 |
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#include <stdio.h> |
8 |
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|
9 |
#include "delay.h" |
#include "delay.h" |
10 |
#include "i2c.h" |
#include "i2c.h" |
11 |
#include "lcd.h" |
#include "lcd.h" |
14 |
//Defines |
//Defines |
15 |
#define TC74 0x9A /* I2C TC74 IC */ |
#define TC74 0x9A /* I2C TC74 IC */ |
16 |
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|
17 |
////////////// |
#define SLIP_END 192 |
18 |
// Enums |
#define SLIP_ESC 219 |
19 |
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#define SLIP_ESCAPED_END 220 |
20 |
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#define SLIP_ESCAPED_ESC 221 |
21 |
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22 |
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#define BUFFERLEN 16 |
23 |
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24 |
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////////////////////////////////////////////////////////////////// |
25 |
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// Enumerations |
26 |
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|
27 |
enum SlipState{ |
enum SlipState{ |
28 |
SlipNormal, |
SlipNormal, |
31 |
SlipStopped |
SlipStopped |
32 |
}; |
}; |
33 |
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|
34 |
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enum BaudRates{ |
35 |
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Baud1200, |
36 |
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Baud2400, |
37 |
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Baud4800, |
38 |
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Baud9600, |
39 |
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Baud19200 |
40 |
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}; |
41 |
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|
42 |
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enum Commands{ |
43 |
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CmdRead, |
44 |
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CmdWrite, |
45 |
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CmdAck, |
46 |
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CmdNAck |
47 |
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}; |
48 |
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49 |
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enum Targets { |
50 |
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TLed3, //0 |
51 |
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TLed4, |
52 |
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TLed5, |
53 |
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TSwitch2, |
54 |
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TSwitch3, |
55 |
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TPotmeter, |
56 |
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TTemp, |
57 |
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TBaud = 10 |
58 |
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}; |
59 |
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|
60 |
////////////////////////////////////////////////////////////////// |
////////////////////////////////////////////////////////////////// |
61 |
//Globale data |
//Globale data |
62 |
// Alle globale variabler bruger "global_" som prefix |
// Alle globale variabler bruger "global_" som prefix |
63 |
unsigned char global_comm_buffer[10]; |
|
64 |
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unsigned char global_comm_buffer[BUFFERLEN]; |
65 |
unsigned char global_comm_length; |
unsigned char global_comm_length; |
66 |
unsigned char global_comm_index; |
|
67 |
bit global_comm_ready; |
bit global_comm_ready; |
68 |
bit global_comm_recieving; |
bit global_comm_error; |
69 |
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70 |
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unsigned char global_comm_slipstate; |
71 |
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unsigned char global_comm_baudrate; |
72 |
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73 |
unsigned char global_comm_state; |
unsigned char global_lcd_buffer[2][BUFFERLEN]; |
74 |
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75 |
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76 |
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bit global_led_0; |
77 |
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bit global_led_1; |
78 |
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bit global_led_2; |
79 |
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80 |
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bit global_reset_baudrate; |
81 |
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82 |
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char global_temp; |
83 |
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unsigned char global_potmeter_hi; |
84 |
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unsigned char global_potmeter_lo; |
85 |
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|
86 |
/////////////////////////////////////////////////////////////////// |
/////////////////////////////////////////////////////////////////// |
87 |
// Interrupt funktioner |
// Interrupt funktioner |
88 |
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|
89 |
void recieve_interrupt(void) |
void recieve_interrupt(void) |
90 |
{ |
{ |
91 |
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unsigned char data = RCREG; |
92 |
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|
93 |
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if (global_comm_length == BUFFERLEN) //avoid buffer overrun |
94 |
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global_comm_slipstate == SlipError; |
95 |
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|
96 |
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switch (global_comm_slipstate) |
97 |
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{ |
98 |
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case SlipNormal: |
99 |
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if (data == SLIP_END) |
100 |
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{ |
101 |
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global_comm_ready = 1; |
102 |
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global_comm_slipstate = SlipStopped; |
103 |
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} |
104 |
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else if (data == SLIP_ESC) |
105 |
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{ |
106 |
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global_comm_slipstate = SlipEscaped; |
107 |
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} |
108 |
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else |
109 |
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global_comm_buffer[ global_comm_length++ ] = data; |
110 |
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break; |
111 |
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112 |
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case SlipEscaped: |
113 |
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if (data == SLIP_ESCAPED_ESC) |
114 |
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{ |
115 |
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global_comm_buffer[ global_comm_length++ ] = SLIP_ESC; |
116 |
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global_comm_slipstate = SlipNormal; |
117 |
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} |
118 |
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else if (data ==SLIP_ESCAPED_END) |
119 |
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{ |
120 |
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global_comm_buffer[ global_comm_length++ ] = SLIP_END; |
121 |
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global_comm_slipstate = SlipNormal; |
122 |
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} |
123 |
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else |
124 |
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{ |
125 |
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global_comm_slipstate = SlipError; |
126 |
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} |
127 |
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case SlipError: |
128 |
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if (data == SLIP_END) |
129 |
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{ |
130 |
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global_comm_error = 1; |
131 |
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global_comm_slipstate = SlipStopped; |
132 |
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global_comm_ready = 1; |
133 |
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} |
134 |
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case SlipStopped: //vi var ikke klar til at modtage data |
135 |
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global_comm_error = 1; |
136 |
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} |
137 |
} |
} |
138 |
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|
139 |
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/* |
140 |
void transmit_interrupt(void) |
void transmit_interrupt(void) |
141 |
{ |
{ |
142 |
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RB2 = !RB2; |
143 |
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} |
144 |
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*/ |
145 |
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//Timer1 er en 16 bit timer, der kører med en 1:8 prescaler, |
146 |
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// og er styret fra en ekstern 32768 Hz krystal |
147 |
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//Når at registrene preloades med 0xEFFF vil det resultere i en |
148 |
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//timer overflow ca hvert sekund |
149 |
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void timer1_interrupt(void) |
150 |
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{ |
151 |
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TMR1H = 0xEF; |
152 |
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TMR1L = 0xFF; |
153 |
} |
} |
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|
154 |
void interrupt interrupt_handler(void) |
void interrupt interrupt_handler(void) |
155 |
{ |
{ |
156 |
if (RCIF == 1) |
if (RCIF == 1) |
158 |
recieve_interrupt(); |
recieve_interrupt(); |
159 |
RCIF = 0; |
RCIF = 0; |
160 |
} |
} |
161 |
if (TXIF == 1) |
/*if (TXIF == 1) |
162 |
{ |
{ |
163 |
transmit_interrupt(); |
transmit_interrupt(); |
164 |
TXIF = 0; |
TXIF = 0; |
165 |
} |
} |
166 |
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*/ |
167 |
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|
168 |
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if (TMR1IF == 1) |
169 |
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{ |
170 |
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timer1_interrupt(); |
171 |
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TMR1IF = 0; |
172 |
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} |
173 |
} |
} |
174 |
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|
175 |
/////////////////////////////////////////////////////////////////// |
/////////////////////////////////////////////////////////////////// |
176 |
// Alm funktioner |
// Slip funktioner |
177 |
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|
178 |
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179 |
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void slip_reset(void) |
180 |
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{ |
181 |
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global_comm_error = 0; |
182 |
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global_comm_slipstate = SlipNormal; |
183 |
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global_comm_ready = 0; |
184 |
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global_comm_length = 0; |
185 |
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memset(global_comm_buffer, 0, BUFFERLEN); |
186 |
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} |
187 |
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|
188 |
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void slip_highlevel_protocol(void) |
189 |
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{ |
190 |
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unsigned char cmd,target,data; |
191 |
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|
192 |
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cmd = global_comm_buffer[0] & 0x0F; |
193 |
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target = ( global_comm_buffer[0] >> 4 ) & 0x0F; |
194 |
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data = global_comm_buffer[1]; |
195 |
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|
196 |
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if (cmd == CmdRead || cmd == CmdWrite) |
197 |
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{ |
198 |
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//sæt standart længde - da længden kun varierer ved læsning af potmeter |
199 |
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if (cmd == CmdRead) |
200 |
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global_comm_length = 2; |
201 |
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else |
202 |
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global_comm_length = 1; |
203 |
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|
204 |
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switch(target) |
205 |
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{ |
206 |
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case TLed3: |
207 |
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if (cmd == CmdRead) |
208 |
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global_comm_buffer[1] = global_led_0; |
209 |
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else |
210 |
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global_led_0 = data; |
211 |
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break; |
212 |
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case TLed4: |
213 |
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if(cmd == CmdRead) |
214 |
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global_comm_buffer[1] = global_led_1; |
215 |
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else |
216 |
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global_led_1 = data; |
217 |
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break; |
218 |
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case TLed5: |
219 |
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if (cmd == CmdRead) |
220 |
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global_comm_buffer[1] = global_led_2; |
221 |
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else |
222 |
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global_led_2 = data; |
223 |
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break; |
224 |
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case TSwitch2: |
225 |
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if (cmd == CmdRead) |
226 |
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global_comm_buffer[1] = !RA4; |
227 |
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else |
228 |
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global_comm_error = 1; |
229 |
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break; |
230 |
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case TSwitch3: |
231 |
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if (cmd == CmdRead) |
232 |
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global_comm_buffer[1] = !RB0; |
233 |
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else |
234 |
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global_comm_error = 1; |
235 |
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break; |
236 |
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case TPotmeter: |
237 |
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if (cmd == CmdRead) |
238 |
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{ |
239 |
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global_comm_buffer[1] = global_potmeter_hi; |
240 |
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global_comm_buffer[2] = global_potmeter_lo; |
241 |
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global_comm_length = 3; |
242 |
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} |
243 |
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else |
244 |
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global_comm_error = 1; |
245 |
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break; |
246 |
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case TTemp: |
247 |
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if (cmd == CmdRead) |
248 |
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global_comm_buffer[1] = global_temp; |
249 |
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else |
250 |
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global_comm_error = 1; |
251 |
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break; |
252 |
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case TBaud: |
253 |
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if (cmd == CmdRead) |
254 |
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global_comm_error = 1; |
255 |
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else |
256 |
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{ |
257 |
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//we can only handle 1200,2400,9600,19200 |
258 |
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if (data == 0 || data == 1 || data == 3 || data == 4) |
259 |
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{ |
260 |
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global_reset_baudrate = 1; |
261 |
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global_comm_baudrate = data; |
262 |
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} |
263 |
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else |
264 |
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global_comm_error = 1; |
265 |
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} |
266 |
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break; |
267 |
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default: |
268 |
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global_comm_error = 1; |
269 |
|
|
270 |
|
} |
271 |
|
} |
272 |
|
else //kommandoen var noget andet end read/write |
273 |
|
{ |
274 |
|
global_comm_error = 1; |
275 |
|
} |
276 |
|
|
277 |
|
|
278 |
|
if (global_comm_error == 1) //we saw an error |
279 |
|
{ |
280 |
|
global_comm_buffer[0] = CmdNAck | target<<4; |
281 |
|
global_comm_length = 1; |
282 |
|
} |
283 |
|
else |
284 |
|
{ |
285 |
|
global_comm_buffer[0] = CmdAck | target<<4; //skriv acknowledge feltet |
286 |
|
} |
287 |
|
} |
288 |
|
|
289 |
|
void slip_send_byte(char data) |
290 |
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{ |
291 |
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TXREG = data; |
292 |
|
while (TRMT==0) ; |
293 |
|
DelayUs(20); |
294 |
|
} |
295 |
|
|
296 |
|
void slip_send_response(void) |
297 |
|
{ |
298 |
|
int i; |
299 |
|
for (i=0; i< global_comm_length;i++) |
300 |
|
{ |
301 |
|
if ( global_comm_buffer[i] == SLIP_ESC) |
302 |
|
{ |
303 |
|
slip_send_byte(SLIP_ESC); |
304 |
|
slip_send_byte(SLIP_ESCAPED_ESC); |
305 |
|
} |
306 |
|
else if (global_comm_buffer[i] == SLIP_END) |
307 |
|
{ |
308 |
|
slip_send_byte(SLIP_ESC); |
309 |
|
slip_send_byte(SLIP_ESCAPED_END); |
310 |
|
} |
311 |
|
else |
312 |
|
{ |
313 |
|
slip_send_byte( global_comm_buffer[i]); |
314 |
|
} |
315 |
|
} |
316 |
|
|
317 |
|
slip_send_byte(SLIP_END); |
318 |
|
} |
319 |
|
|
320 |
|
/////////////////////////////////////////////////////////////////// |
321 |
|
// init funktioner |
322 |
|
|
323 |
void interrupt_init(void) |
void interrupt_init(void) |
324 |
{ |
{ |
325 |
TXIE = 1; //Enable AUX TX interrupt - testes med TXIF; |
TXIE = 0; //Disable AUX TX interrupt - testes med TXIF; |
326 |
RCIE = 1; //Enable AUX Recieve interrupt - testes med RCIF; |
RCIE = 1; //Enable AUX Recieve interrupt - testes med RCIF; |
327 |
|
|
328 |
IPEN = 0; // IPEN=Interrupt Priority ENable bit - her bruges ingen prioritet |
IPEN = 0; // IPEN=Interrupt Priority ENable bit - her bruges ingen prioritet |
331 |
|
|
332 |
TXIF = 0; //nulstil intterupt flag |
TXIF = 0; //nulstil intterupt flag |
333 |
RCIF = 0; |
RCIF = 0; |
334 |
|
|
335 |
|
TMR1IE = 1; // Timer 1 |
336 |
|
|
337 |
GIE = 1; //Global interrupt enable bit |
GIE = 1; //Global interrupt enable bit |
338 |
} |
} |
368 |
// RCSTA2 = 0 No framing error |
// RCSTA2 = 0 No framing error |
369 |
// RCSTA1 = 0 Overrun error bit |
// RCSTA1 = 0 Overrun error bit |
370 |
// RCSTA0 = 0 9th bit */ |
// RCSTA0 = 0 9th bit */ |
371 |
|
|
372 |
//config completed |
//config completed |
373 |
SPEN = 1; //Enable Serial port |
SPEN = 1; //Enable Serial port |
374 |
} |
} |
375 |
|
|
376 |
|
/* basic I/O ports */ |
377 |
|
void io_init(void) |
378 |
|
{ |
379 |
|
TRISB3 = 0; //LED ports = output |
380 |
|
TRISB2 = 0; |
381 |
|
TRISB1 = 0; |
382 |
|
|
383 |
|
TRISB0 = 1; //Switch porte = input |
384 |
|
TRISA0 = 1; |
385 |
|
} |
386 |
|
|
387 |
|
void ad_init(void) |
388 |
|
{ |
389 |
|
// AD Conversion clock |
390 |
|
ADCS0 = 0; |
391 |
|
ADCS1 = 0; |
392 |
|
ADCS2 = 0; |
393 |
|
|
394 |
|
//Select AN0/RA0 for AD source |
395 |
|
CHS0=0; |
396 |
|
CHS1=0; |
397 |
|
CHS2=0; |
398 |
|
|
399 |
|
//Only AN0 is selected for AD and with Vdd/Vss as limits |
400 |
|
PCFG0=0; |
401 |
|
PCFG1=1; |
402 |
|
PCFG2=1; |
403 |
|
PCFG3=1; |
404 |
|
|
405 |
|
//Result is right justified |
406 |
|
ADFM=1; |
407 |
|
|
408 |
|
//Fire up for A/D converter module |
409 |
|
ADON=1; |
410 |
|
} |
411 |
|
|
412 |
void i2c_init(void) |
void i2c_init(void) |
413 |
{ |
{ |
414 |
|
// I2C_MODULE hører hjemme i i2c.h |
415 |
#ifdef I2C_MODULE |
#ifdef I2C_MODULE |
416 |
SSPMode(MASTER_MODE); |
SSPMode(MASTER_MODE); |
417 |
SSPEN = 1; |
SSPEN = 1; |
424 |
#endif |
#endif |
425 |
} |
} |
426 |
|
|
427 |
|
void timer_init(void) |
428 |
|
{ |
429 |
|
TMR1CS = 1; //use external clock |
430 |
|
|
431 |
|
T1CKPS1 = 1; //1:8 prescale |
432 |
|
T1CKPS0 = 1; |
433 |
|
|
434 |
|
TMR1H = 0xEF; |
435 |
|
TMR1L = 0xFF; |
436 |
|
|
437 |
|
T1OSCEN = 1; //enable oscillator circuit |
438 |
|
RD16 = 0; //normal 8 bit writes |
439 |
|
TMR1ON = 1; |
440 |
|
} |
441 |
|
|
442 |
|
/////////////////////////////////////////////////////////////////// |
443 |
|
// Gennerelle funktioner |
444 |
|
|
445 |
|
|
446 |
char ReadTemp(void) |
char ReadTemp(void) |
455 |
} |
} |
456 |
|
|
457 |
|
|
458 |
|
|
459 |
|
void update_lcd(void) |
460 |
|
{ |
461 |
|
static char current_row = 0; |
462 |
|
static char current_char = 0; |
463 |
|
|
464 |
|
if ( current_char >= BUFFERLEN || global_lcd_buffer[current_row][current_char] == 0 ) |
465 |
|
{ |
466 |
|
current_row++; |
467 |
|
current_char = 0; |
468 |
|
lcd_goto(0x40); |
469 |
|
} |
470 |
|
|
471 |
|
if (current_row >= 2) |
472 |
|
{ |
473 |
|
sprintf(global_lcd_buffer[1], "T=%02d, P=%04d", global_temp, (global_potmeter_hi<<8) | global_potmeter_lo); |
474 |
|
lcd_goto(0x00); |
475 |
|
current_row = 0; |
476 |
|
} |
477 |
|
|
478 |
|
lcd_putch(global_lcd_buffer[current_row][current_char]); |
479 |
|
current_char++; |
480 |
|
} |
481 |
|
|
482 |
|
void reset_baudrate(void) |
483 |
|
{ |
484 |
|
SPEN = 0; //disable serial port |
485 |
|
|
486 |
|
//set baudrate generator, i henhold til side 171 af PIC18F452 dokumentationen |
487 |
|
switch (global_comm_baudrate) |
488 |
|
{ |
489 |
|
case Baud1200: |
490 |
|
SPBRG = 207; |
491 |
|
strcpy(global_lcd_buffer[0],"Baud=1200 "); |
492 |
|
break; |
493 |
|
case Baud2400: |
494 |
|
SPBRG = 103; |
495 |
|
strcpy(global_lcd_buffer[0],"Baud=2400 "); |
496 |
|
break; |
497 |
|
case Baud9600: |
498 |
|
SPBRG = 25; |
499 |
|
strcpy(global_lcd_buffer[0],"Baud=9600 "); |
500 |
|
break; |
501 |
|
case Baud19200: |
502 |
|
SPBRG = 12; |
503 |
|
strcpy(global_lcd_buffer[0],"Baud=19200"); |
504 |
|
break; |
505 |
|
default: |
506 |
|
strcpy(global_lcd_buffer[0],"Baud=9600 "); |
507 |
|
SPBRG = 25; // this should not be possible, but default to 9600 anyway |
508 |
|
} |
509 |
|
SPEN = 1; // enable the serial port again |
510 |
|
} |
511 |
|
|
512 |
/////////////////////////////////////////////////////////////////// |
/////////////////////////////////////////////////////////////////// |
513 |
//Main |
//Main |
514 |
|
|
518 |
lcd_init(0); //init in 4-bit mode |
lcd_init(0); //init in 4-bit mode |
519 |
i2c_init(); |
i2c_init(); |
520 |
serial_init(); //9600 8N1 |
serial_init(); //9600 8N1 |
521 |
|
ad_init(); |
522 |
|
io_init(); |
523 |
|
timer_init(); |
524 |
interrupt_init(); |
interrupt_init(); |
525 |
|
|
|
global_comm_length = 0; |
|
|
global_comm_ready = 0; |
|
526 |
|
|
527 |
|
slip_reset(); //take SLIP FSM into normal state |
528 |
global_comm_state = SlipNormal; |
global_comm_baudrate = Baud9600; //default baudrate = 9600 (allready set in serial_init) |
529 |
|
global_reset_baudrate = 0; |
530 |
|
|
531 |
// initialisation completed and we are ready to recieve commands - enable serial reception |
// initialisation completed and we are ready to recieve commands - enable serial reception |
532 |
CREN = 1; |
CREN = 1; |
533 |
|
|
534 |
|
strcpy(global_lcd_buffer[0], "Baud=9600 "); |
535 |
while (1) |
while (1) |
536 |
{ |
{ |
537 |
|
if (global_comm_ready == 1) |
538 |
|
{ |
539 |
|
slip_highlevel_protocol(); //parse the slip frame recieved & generate response |
540 |
|
slip_send_response(); |
541 |
|
slip_reset(); |
542 |
|
} |
543 |
|
|
544 |
|
if ( global_reset_baudrate == 1) |
545 |
|
{ |
546 |
|
reset_baudrate(); |
547 |
|
global_reset_baudrate = 0; |
548 |
|
} |
549 |
|
|
550 |
|
RB1 = global_led_0; |
551 |
|
RB2 = global_led_1; |
552 |
|
RB3 = global_led_2; |
553 |
|
|
554 |
|
global_temp = ReadTemp(); |
555 |
|
|
556 |
|
//potmeter |
557 |
|
if (GODONE ==0 )//hvis A/D-conv er færdig |
558 |
|
{ |
559 |
|
|
560 |
|
global_potmeter_hi = ADRESH;//gem AD resultat |
561 |
|
global_potmeter_lo = ADRESL; |
562 |
|
GODONE = 1; //start ny konverering |
563 |
|
} |
564 |
|
|
565 |
|
update_lcd(); |
566 |
} |
} |
567 |
} |
} |
568 |
|
|