1 |
/* H7 -projekt opgave */ |
2 |
|
3 |
///////////////////////////////////////////////////////////////////////
|
4 |
//Includes |
5 |
#include <pic18.h>
|
6 |
#include <string.h>
|
7 |
#include <stdio.h>
|
8 |
|
9 |
#include "delay.h" |
10 |
#include "i2c.h"
|
11 |
#include "lcd.h" |
12 |
|
13 |
/////////////////////////////////////////////////////////////////////
|
14 |
//Defines
|
15 |
#define TC74 0x9A /* I2C TC74 IC */
|
16 |
|
17 |
#define SLIP_END 192
|
18 |
#define SLIP_ESC 219
|
19 |
#define SLIP_ESCAPED_END 220
|
20 |
#define SLIP_ESCAPED_ESC 221
|
21 |
|
22 |
#define BUFFERLEN 16
|
23 |
|
24 |
//////////////////////////////////////////////////////////////////
|
25 |
// Enumerations
|
26 |
|
27 |
enum SlipState{
|
28 |
SlipNormal,
|
29 |
SlipEscaped,
|
30 |
SlipError,
|
31 |
SlipStopped
|
32 |
};
|
33 |
|
34 |
enum BaudRates{
|
35 |
Baud1200,
|
36 |
Baud2400,
|
37 |
Baud4800,
|
38 |
Baud9600,
|
39 |
Baud19200
|
40 |
};
|
41 |
|
42 |
enum Commands{
|
43 |
CmdRead,
|
44 |
CmdWrite,
|
45 |
CmdAck,
|
46 |
CmdNAck
|
47 |
};
|
48 |
|
49 |
enum Targets {
|
50 |
TLed3, //0
|
51 |
TLed4,
|
52 |
TLed5,
|
53 |
TSwitch2,
|
54 |
TSwitch3,
|
55 |
TPotmeter,
|
56 |
TTemp,
|
57 |
TBaud = 10
|
58 |
};
|
59 |
|
60 |
//////////////////////////////////////////////////////////////////
|
61 |
//Globale data
|
62 |
// Alle globale variabler bruger "global_" som prefix
|
63 |
|
64 |
unsigned char global_comm_buffer[BUFFERLEN];
|
65 |
unsigned char global_comm_length;
|
66 |
|
67 |
bit global_comm_ready;
|
68 |
bit global_comm_error;
|
69 |
|
70 |
unsigned char global_comm_slipstate;
|
71 |
unsigned char global_comm_baudrate;
|
72 |
|
73 |
unsigned char global_lcd_buffer[2][BUFFERLEN];
|
74 |
|
75 |
|
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bit global_led_0;
|
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bit global_led_1;
|
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bit global_led_2;
|
79 |
|
80 |
bit global_reset_baudrate;
|
81 |
|
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char global_temp;
|
83 |
unsigned char global_potmeter_hi;
|
84 |
unsigned char global_potmeter_lo;
|
85 |
|
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///////////////////////////////////////////////////////////////////
|
87 |
// Interrupt funktioner
|
88 |
|
89 |
void recieve_interrupt(void)
|
90 |
{
|
91 |
unsigned char data = RCREG;
|
92 |
|
93 |
if (global_comm_length == BUFFERLEN) //avoid buffer overrun
|
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global_comm_slipstate == SlipError;
|
95 |
|
96 |
switch (global_comm_slipstate)
|
97 |
{
|
98 |
case SlipNormal:
|
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if (data == SLIP_END)
|
100 |
{
|
101 |
global_comm_ready = 1;
|
102 |
global_comm_slipstate = SlipStopped;
|
103 |
}
|
104 |
else if (data == SLIP_ESC)
|
105 |
{
|
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global_comm_slipstate = SlipEscaped;
|
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}
|
108 |
else
|
109 |
global_comm_buffer[ global_comm_length++ ] = data;
|
110 |
break;
|
111 |
|
112 |
case SlipEscaped:
|
113 |
if (data == SLIP_ESCAPED_ESC)
|
114 |
{
|
115 |
global_comm_buffer[ global_comm_length++ ] = SLIP_ESC;
|
116 |
global_comm_slipstate = SlipNormal;
|
117 |
}
|
118 |
else if (data ==SLIP_ESCAPED_END)
|
119 |
{
|
120 |
global_comm_buffer[ global_comm_length++ ] = SLIP_END;
|
121 |
global_comm_slipstate = SlipNormal;
|
122 |
}
|
123 |
else
|
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{
|
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global_comm_slipstate = SlipError;
|
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}
|
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case SlipError:
|
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if (data == SLIP_END)
|
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{
|
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global_comm_error = 1;
|
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global_comm_slipstate = SlipStopped;
|
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global_comm_ready = 1;
|
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}
|
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case SlipStopped: //vi var ikke klar til at modtage data
|
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global_comm_error = 1;
|
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}
|
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}
|
138 |
|
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/*
|
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void transmit_interrupt(void)
|
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{
|
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RB2 = !RB2;
|
143 |
}
|
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*/
|
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//Timer1 er en 16 bit timer, der kører med en 1:8 prescaler,
|
146 |
// og er styret fra en ekstern 32768 Hz krystal
|
147 |
//Når at registrene preloades med 0xEFFF vil det resultere i en
|
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//timer overflow ca hvert sekund
|
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void timer1_interrupt(void)
|
150 |
{
|
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TMR1H = 0xEF;
|
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TMR1L = 0xFF;
|
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}
|
154 |
void interrupt interrupt_handler(void)
|
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{
|
156 |
if (RCIF == 1)
|
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{
|
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recieve_interrupt();
|
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RCIF = 0;
|
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}
|
161 |
/*if (TXIF == 1)
|
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{
|
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transmit_interrupt();
|
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TXIF = 0;
|
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}
|
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*/
|
167 |
|
168 |
if (TMR1IF == 1)
|
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{
|
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timer1_interrupt();
|
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TMR1IF = 0;
|
172 |
}
|
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}
|
174 |
|
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///////////////////////////////////////////////////////////////////
|
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// Slip funktioner
|
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|
178 |
|
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void slip_reset(void)
|
180 |
{
|
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global_comm_error = 0;
|
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global_comm_slipstate = SlipNormal;
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global_comm_ready = 0;
|
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global_comm_length = 0;
|
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memset(global_comm_buffer, 0, BUFFERLEN);
|
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}
|
187 |
|
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void slip_highlevel_protocol(void)
|
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{
|
190 |
unsigned char cmd,target,data;
|
191 |
|
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cmd = global_comm_buffer[0] & 0x0F;
|
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target = ( global_comm_buffer[0] >> 4 ) & 0x0F;
|
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data = global_comm_buffer[1];
|
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|
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if (cmd == CmdRead || cmd == CmdWrite)
|
197 |
{
|
198 |
//sæt standart længde - da længden kun varierer ved læsning af potmeter
|
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if (cmd == CmdRead)
|
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global_comm_length = 2;
|
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else
|
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global_comm_length = 1;
|
203 |
|
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switch(target)
|
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{
|
206 |
case TLed3:
|
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if (cmd == CmdRead)
|
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global_comm_buffer[1] = global_led_0;
|
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else
|
210 |
global_led_0 = data;
|
211 |
break;
|
212 |
case TLed4:
|
213 |
if(cmd == CmdRead)
|
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global_comm_buffer[1] = global_led_1;
|
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else
|
216 |
global_led_1 = data;
|
217 |
break;
|
218 |
case TLed5:
|
219 |
if (cmd == CmdRead)
|
220 |
global_comm_buffer[1] = global_led_2;
|
221 |
else
|
222 |
global_led_2 = data;
|
223 |
break;
|
224 |
case TSwitch2:
|
225 |
if (cmd == CmdRead)
|
226 |
global_comm_buffer[1] = !RA4;
|
227 |
else
|
228 |
global_comm_error = 1;
|
229 |
break;
|
230 |
case TSwitch3:
|
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if (cmd == CmdRead)
|
232 |
global_comm_buffer[1] = !RB0;
|
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else
|
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global_comm_error = 1;
|
235 |
break;
|
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case TPotmeter:
|
237 |
if (cmd == CmdRead)
|
238 |
{
|
239 |
global_comm_buffer[1] = global_potmeter_hi;
|
240 |
global_comm_buffer[2] = global_potmeter_lo;
|
241 |
global_comm_length = 3;
|
242 |
}
|
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else
|
244 |
global_comm_error = 1;
|
245 |
break;
|
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case TTemp:
|
247 |
if (cmd == CmdRead)
|
248 |
global_comm_buffer[1] = global_temp;
|
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else
|
250 |
global_comm_error = 1;
|
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break;
|
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case TBaud:
|
253 |
if (cmd == CmdRead)
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global_comm_error = 1;
|
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else
|
256 |
{
|
257 |
//we can only handle 1200,2400,9600,19200
|
258 |
if (data == 0 || data == 1 || data == 3 || data == 4)
|
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{
|
260 |
global_reset_baudrate = 1;
|
261 |
global_comm_baudrate = data;
|
262 |
}
|
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else
|
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global_comm_error = 1;
|
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}
|
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break;
|
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default:
|
268 |
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
|
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{
|
285 |
global_comm_buffer[0] = CmdAck | target<<4; //skriv acknowledge feltet
|
286 |
}
|
287 |
}
|
288 |
|
289 |
void slip_send_byte(char data)
|
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{
|
291 |
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)
|
324 |
{
|
325 |
TXIE = 0; //Disable AUX TX interrupt - testes med TXIF;
|
326 |
RCIE = 1; //Enable AUX Recieve interrupt - testes med RCIF;
|
327 |
|
328 |
IPEN = 0; // IPEN=Interrupt Priority ENable bit - her bruges ingen prioritet
|
329 |
|
330 |
PEIE = 1; // PEIE = PEriphal Interrupt Enable
|
331 |
|
332 |
TXIF = 0; //nulstil intterupt flag
|
333 |
RCIF = 0;
|
334 |
|
335 |
TMR1IE = 1; // Timer 1
|
336 |
|
337 |
GIE = 1; //Global interrupt enable bit
|
338 |
}
|
339 |
|
340 |
void serial_init(void)
|
341 |
{
|
342 |
SPEN = 0; //Make sure serial port is disabled
|
343 |
|
344 |
// snupset fra Kim H Pedersens serialmain.c
|
345 |
// Set Port C bit 6 output (TxD) and bit 7 input (RxD)
|
346 |
TRISC6 = 0;
|
347 |
TRISC7 = 1;
|
348 |
|
349 |
SPBRG = 25; // x = Fosc/(16 * Baud Rate) - 1
|
350 |
// x = 4000000/(16 * 9600) - 1
|
351 |
// x = 25.0417 ~ 25
|
352 |
// Baud Rate = Fosc/(16 * (x+1))
|
353 |
// Baud Rate = 4000000/(16 * (25+1))
|
354 |
// Baud Rate = 9615
|
355 |
TXSTA = 0x24; // TXSTA7 = 0 Don't care in asynchronous
|
356 |
// TXSTA6 = 0 8-bit transmission
|
357 |
// TXSTA5 = 1 Transmit enabled
|
358 |
// TXSTA4 = 0 Asynchronous mode
|
359 |
// TXSTA3 = 0 Unimplemented
|
360 |
// TXSTA2 = 1 High speed
|
361 |
// TXSTA1 = 0 TSR empty
|
362 |
// TXSTA0 = 0 9th bit */
|
363 |
RCSTA = 0x90; // RCSTA7 = 0 Serial port disabled
|
364 |
// RCSTA6 = 0 8-bit reception
|
365 |
// RCSTA5 = 0 Don't care in asynchronous
|
366 |
// RCSTA4 = 1 Receiver enabled
|
367 |
// RCSTA3 = 0 Don't care (8-bit operation)
|
368 |
// RCSTA2 = 0 No framing error
|
369 |
// RCSTA1 = 0 Overrun error bit
|
370 |
// RCSTA0 = 0 9th bit */
|
371 |
|
372 |
//config completed
|
373 |
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)
|
413 |
{
|
414 |
// I2C_MODULE hører hjemme i i2c.h
|
415 |
#ifdef I2C_MODULE |
416 |
SSPMode(MASTER_MODE); |
417 |
SSPEN = 1; |
418 |
CKP = 1; |
419 |
#else |
420 |
SCL_DIR = I2C_OUTPUT; |
421 |
SDA_DIR = I2C_OUTPUT; |
422 |
SDA = 0; |
423 |
SCL = 0; |
424 |
#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)
|
447 |
{
|
448 |
char temp;
|
449 |
i2c_WriteTo(TC74); //write to, will automatically send a start condition
|
450 |
i2c_PutByte(0x00); //tell TC74 we want to read
|
451 |
i2c_ReadFrom(TC74);
|
452 |
temp = i2c_GetByte(I2C_LAST);
|
453 |
i2c_Stop(); //assert a stop condition on SDA & SCL
|
454 |
return temp;
|
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
|
514 |
|
515 |
|
516 |
void main(void)
|
517 |
{
|
518 |
lcd_init(0); //init in 4-bit mode
|
519 |
i2c_init();
|
520 |
serial_init(); //9600 8N1
|
521 |
ad_init();
|
522 |
io_init();
|
523 |
timer_init();
|
524 |
interrupt_init();
|
525 |
|
526 |
|
527 |
slip_reset(); //take SLIP FSM into normal state
|
528 |
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
|
532 |
CREN = 1;
|
533 |
|
534 |
strcpy(global_lcd_buffer[0], "Baud=9600 ");
|
535 |
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 |
} |