trunk/PIC/main.c

/* H7 -projekt opgave */

///////////////////////////////////////////////////////////////////////
//Includes
#include <pic18.h>
#include <string.h>

#include "delay.h"
#include "i2c.h"
#include "lcd.h"

/////////////////////////////////////////////////////////////////////
//Defines
#define TC74 0x9A /* I2C TC74 IC */

#define SLIP_END 192
#define SLIP_ESC 219
#define SLIP_ESCAPED_END 220
#define SLIP_ESCAPED_ESC 221

#define BUFFERLEN 16

//////////////////////////////////////////////////////////////////
// Enumerations

enum SlipState{
        SlipNormal,
        SlipEscaped,
        SlipError,
        SlipStopped
};

enum BaudRates{
        Baud1200,
        Baud2400,
        Baud4800,
        Baud9600,
        Baud19200
};

enum Commands{
        CmdRead,
        CmdWrite,
        CmdAck,
        CmdNAck
};

enum Targets {
        TLed3, //0
        TLed4,
        TLed5,
        TSwitch2,
        TSwitch3,
        TPotmeter,
        TTemp,
        TBaud = 10
};

//////////////////////////////////////////////////////////////////
//Globale data
// Alle globale variabler bruger "global_" som prefix

unsigned char global_comm_buffer[BUFFERLEN]; 
unsigned char global_comm_length;

bit global_comm_ready;
bit global_comm_error;

unsigned char global_comm_slipstate;
unsigned char global_comm_currentrate;

unsigned char global_lcd_buffer[20];
unsigned char global_lcd_index;


bit global_led_0;
bit global_led_1;
bit global_led_2;

bit global_reset_baudrate;

char global_temp;
unsigned char global_potmeter_hi;
unsigned char global_potmeter_lo;

///////////////////////////////////////////////////////////////////
// Interrupt funktioner

void recieve_interrupt(void)
{
        unsigned char data = RCREG;     
        
        switch (global_comm_slipstate)
        {               
                case SlipNormal:
                        if (data == SLIP_END)
                        {
                                global_comm_ready = 1;
                                global_comm_slipstate = SlipStopped;
                        }
                        else if (data == SLIP_ESC)
                        {
                                global_comm_slipstate = SlipEscaped;
                        }
                        else
                                global_comm_buffer[ global_comm_length++ ] = data; 
                        break;
                        
                case SlipEscaped:
                        if (data == SLIP_ESCAPED_ESC)
                        {
                                global_comm_buffer[ global_comm_length++ ] = SLIP_ESC;
                                global_comm_slipstate = SlipNormal;
                        }
                        else if (data ==SLIP_ESCAPED_END)
                        {
                                global_comm_buffer[ global_comm_length++ ] = SLIP_END;
                                global_comm_slipstate = SlipNormal;
                        }
                        else
                        {
                                global_comm_slipstate = SlipError;
                        }
                case SlipError:
                        if (data == SLIP_END)
                        {
                                global_comm_error = 1;
                                global_comm_slipstate = SlipStopped;
                                global_comm_ready = 1;
                        }
                case SlipStopped: //vi var ikke klar til at modtage data
                        global_comm_error = 1;
        }
}

/*
void transmit_interrupt(void)
{
        RB2 = !RB2;
}
*/
//Timer1 er en 16 bit timer, der k�rer med en 1:8 prescaler,
// og er styret fra en ekstern 32768 Hz krystal
//N�r at registrene preloades med 0xEFFF vil det resultere i en 
//timer overflow ca hvert sekund
void timer1_interrupt(void)
{
        RB2 = !RB2;
        TMR1H = 0xEF;
        TMR1L = 0xFF;
}
void interrupt interrupt_handler(void)
{
        if (RCIF == 1)
        {
                recieve_interrupt();
                RCIF = 0;
        }
        /*if (TXIF == 1)
        {
                transmit_interrupt();
                TXIF = 0;
        }
        */
        
        if (TMR1IF == 1)
        {
                timer1_interrupt();
                TMR1IF = 0;
        }
}

///////////////////////////////////////////////////////////////////
// Slip funktioner

void slip_reset(void)
{
        global_comm_error = 0;
        global_comm_slipstate = SlipNormal;
        global_comm_ready = 0;
        global_comm_length = 0;
        memset(global_comm_buffer, 0, BUFFERLEN);
}

void slip_highlevel_protocol(void)
{
        unsigned char cmd,target,data;
        
        cmd = global_comm_buffer[0] & 0x0F;
        target = ( global_comm_buffer[0] >> 4 ) & 0x0F;
        data = global_comm_buffer[1];

        if (cmd == CmdRead || cmd == CmdWrite)
        {
                //s�t standart l�ngde - da l�ngden kun varierer ved l�sning af potmeter
                if (cmd == CmdRead)
                        global_comm_length = 2;
                else
                        global_comm_length = 1;
                        
                switch(target)
                {
                        case TLed3:
                                if (cmd == CmdRead)
                                        global_comm_buffer[1] = global_led_0;
                                else
                                        global_led_0 = data;
                                break;
                        case TLed4:
                                if(cmd == CmdRead)
                                        global_comm_buffer[1] = global_led_1;
                                else
                                        global_led_1 = data;
                                break;
                        case TLed5:
                                if (cmd == CmdRead)
                                        global_comm_buffer[1] = global_led_2;
                                else
                                        global_led_2 = data;
                                break;
                        case TSwitch2:
                                if (cmd == CmdRead)
                                        global_comm_buffer[1] = RA4;
                                else
                                        global_comm_error = 1;
                                break;
                        case TSwitch3:
                                if (cmd == CmdRead)
                                        global_comm_buffer[1] = RB0;
                                else
                                        global_comm_error = 1;
                                break;
                        case TPotmeter:
                                if (cmd == CmdRead)
                                {
                                        global_comm_buffer[1] = global_potmeter_hi;
                                        global_comm_buffer[2] = global_potmeter_lo;
                                        global_comm_length = 3;
                                }
                                else
                                        global_comm_error = 1;
                                break;
                        case TTemp:
                                if (cmd == CmdRead)
                                        global_comm_buffer[1] = global_temp;
                                else
                                        global_comm_error = 1;
                                break;
                        case TBaud:
                                if (cmd == CmdRead)
                                        global_comm_error = 1;
                                else
                                {
                                        //we can only handle 1200,2400,9600,19200
                                        if (data == 0 || data == 1 || data == 3 || data == 4)
                                                global_reset_baudrate = 1;
                                        else
                                                global_comm_error = 1;
                                }
                                break;
                        default:
                                global_comm_error = 1;
                                
                }
        }
        else //kommandoen var noget andet end read/write
        {
                global_comm_error = 1;
        }
        
        
        if (global_comm_error == 1) //we saw an error
        {
                global_comm_buffer[0] = CmdNAck | target<<4;
                global_comm_length = 1;
        }
        else
        {
                global_comm_buffer[0] = CmdAck | target<<4; //skriv acknowledge feltet
        }
}

void slip_send_byte(char data)
{
        TXREG = data;
        while (TRMT==0) ;
        DelayUs(20);
}

void slip_send_response(void)
{
        int i;
        for (i=0; i< global_comm_length;i++)
        {
                if ( global_comm_buffer[i] == SLIP_ESC)
                {
                        slip_send_byte(SLIP_ESC);
                        slip_send_byte(SLIP_ESCAPED_ESC);
                }
                else if (global_comm_buffer[i] == SLIP_END)
                {
                        slip_send_byte(SLIP_ESC);
                        slip_send_byte(SLIP_ESCAPED_END);
                }
                else
                {
                        slip_send_byte( global_comm_buffer[i]);
                }
        }
        
        slip_send_byte(SLIP_END);
}

///////////////////////////////////////////////////////////////////
// Gennerelle funktioner

void interrupt_init(void)
{
        TXIE = 0; //Disable AUX TX interrupt - testes med TXIF;
        RCIE = 1; //Enable AUX Recieve interrupt - testes med RCIF;

        IPEN = 0; // IPEN=Interrupt Priority ENable bit - her bruges ingen prioritet
        
        PEIE = 1; // PEIE = PEriphal Interrupt Enable
                
        TXIF = 0; //nulstil intterupt flag
        RCIF = 0;
        
        TMR1IE = 1; // Timer 1

        GIE = 1; //Global interrupt enable bit
}

void serial_init(void)
{
        SPEN = 0; //Make sure serial port is disabled
        
        // snupset fra  Kim H Pedersens serialmain.c 
        // Set Port C bit 6 output (TxD) and bit 7 input (RxD)
    TRISC6 = 0;
    TRISC7 = 1;

    SPBRG = 25;         //      x = Fosc/(16 * Baud Rate) - 1
                                        //      x = 4000000/(16 * 9600) - 1
                                        //      x = 25.0417 ~ 25
                                        //      Baud Rate = Fosc/(16 * (x+1))
                                        //      Baud Rate = 4000000/(16 * (25+1))
                                        //      Baud Rate = 9615
    TXSTA = 0x24;       //      TXSTA7 = 0      Don't care in asynchronous
                                        //      TXSTA6 = 0      8-bit transmission
                                        //      TXSTA5 = 1      Transmit enabled
                                        //      TXSTA4 = 0      Asynchronous mode
                                        //      TXSTA3 = 0      Unimplemented
                                        //      TXSTA2 = 1      High speed
                                        //      TXSTA1 = 0      TSR empty
                                        //      TXSTA0 = 0      9th bit                                         */
    RCSTA = 0x90;       //      RCSTA7 = 0      Serial port disabled
                                        //      RCSTA6 = 0      8-bit reception
                                        //      RCSTA5 = 0      Don't care in asynchronous
                                        //      RCSTA4 = 1      Receiver enabled
                                        //      RCSTA3 = 0      Don't care (8-bit operation)
                                        //      RCSTA2 = 0      No framing error
                                        //      RCSTA1 = 0      Overrun error bit
                                        //      RCSTA0 = 0      9th bit                                         */

        //config completed
        SPEN = 1; //Enable Serial port
}

/* basic I/O ports */
void io_init(void)
{
        TRISB3 = 0; //LED ports = output
        TRISB2 = 0;
        TRISB1 = 0;
        
        TRISB0 = 1; //Switch porte = input
        TRISA0 = 1;
}

void ad_init(void)
{
        // AD Conversion clock
        ADCS0 = 0;
        ADCS1 = 0;
        ADCS2 = 0;

        //Select AN0/RA0 for AD source
        CHS0=0;
        CHS1=0;
        CHS2=0;
        
        //Only AN0 is selected for AD and with Vdd/Vss as limits
        PCFG0=0;
        PCFG1=1;
        PCFG2=1;
        PCFG3=1;
        
        //Result is right justified
        ADFM=1; 
        
        //Fire up for A/D converter module
        ADON=1;
}

void i2c_init(void)
{
// I2C_MODULE h�rer hjemme i i2c.h
#ifdef I2C_MODULE
    SSPMode(MASTER_MODE);
    SSPEN = 1;
    CKP = 1;
#else
    SCL_DIR = I2C_OUTPUT;
    SDA_DIR = I2C_OUTPUT;
    SDA = 0;
    SCL = 0;
#endif
}

void timer_init(void)
{
        TMR1CS = 1; //use external clock
        
        T1CKPS1 = 1; //1:8 prescale
        T1CKPS0 = 1;
        
        TMR1H = 0xEF;
        TMR1L = 0xFF;

        T1OSCEN = 1; //enable oscillator circuit        
        RD16 = 0; //normal 8 bit writes
        TMR1ON = 1;
}

char ReadTemp(void)
{
        char temp;
        i2c_WriteTo(TC74); //write to, will automatically send a start condition
        i2c_PutByte(0x00); //tell TC74 we want to read
        i2c_ReadFrom(TC74);
        temp = i2c_GetByte(I2C_LAST);
        i2c_Stop(); //assert a stop condition on SDA & SCL
        return temp;
}


///////////////////////////////////////////////////////////////////
//Main


void main(void) 
{
        lcd_init(0); //init in 4-bit mode
        i2c_init();
        serial_init(); //9600 8N1
        ad_init();
        io_init();
        timer_init();
        interrupt_init();
        

        slip_reset(); //take SLIP FSM into normal state
        global_comm_currentrate = Baud9600; //default baudrate = 9600
        global_reset_baudrate = 0;
        
//      initialisation completed and we are ready to recieve commands - enable serial reception
        CREN = 1;
        
        while (1)
        {
                if (global_comm_ready == 1)
                {
                        slip_highlevel_protocol(); //parse the slip frame recieved & generate response
                        slip_send_response();
                        slip_reset();
                }
                
                if ( global_reset_baudrate == 1)
                {
                }
                
                RB1 = global_led_0;
        //      RB2 = global_led_1;
                RB3 = global_led_2;
                
                global_temp = ReadTemp();
                
                //potmeter
                if (GODONE ==0 )//hvis A/D-conv er f�rdig
                {
                        
                        global_potmeter_hi = ADRESH;//gem AD resultat
                        global_potmeter_lo = ADRESL; 
                        GODONE = 1; //start ny konverering
                }
        }
}
1	/* H7 -projekt opgave */
2
3	///////////////////////////////////////////////////////////////////////
4	//Includes
5	#include <pic18.h>
6	#include <string.h>
7
8	#include "delay.h"
9	#include "i2c.h"
10	#include "lcd.h"
11
12	/////////////////////////////////////////////////////////////////////
13	//Defines
14	#define TC74 0x9A /* I2C TC74 IC */
15
16	#define SLIP_END 192
17	#define SLIP_ESC 219
18	#define SLIP_ESCAPED_END 220
19	#define SLIP_ESCAPED_ESC 221
20
21	#define BUFFERLEN 16
22
23	//////////////////////////////////////////////////////////////////
24	// Enumerations
25
26	enum SlipState{
27	SlipNormal,
28	SlipEscaped,
29	SlipError,
30	SlipStopped
31	};
32
33	enum BaudRates{
34	Baud1200,
35	Baud2400,
36	Baud4800,
37	Baud9600,
38	Baud19200
39	};
40
41	enum Commands{
42	CmdRead,
43	CmdWrite,
44	CmdAck,
45	CmdNAck
46	};
47
48	enum Targets {
49	TLed3, //0
50	TLed4,
51	TLed5,
52	TSwitch2,
53	TSwitch3,
54	TPotmeter,
55	TTemp,
56	TBaud = 10
57	};
58
59	//////////////////////////////////////////////////////////////////
60	//Globale data
61	// Alle globale variabler bruger "global_" som prefix
62
63	unsigned char global_comm_buffer[BUFFERLEN];
64	unsigned char global_comm_length;
65
66	bit global_comm_ready;
67	bit global_comm_error;
68
69	unsigned char global_comm_slipstate;
70	unsigned char global_comm_currentrate;
71
72	unsigned char global_lcd_buffer[20];
73	unsigned char global_lcd_index;
74
75
76	bit global_led_0;
77	bit global_led_1;
78	bit global_led_2;
79
80	bit global_reset_baudrate;
81
82	char global_temp;
83	unsigned char global_potmeter_hi;
84	unsigned char global_potmeter_lo;
85
86	///////////////////////////////////////////////////////////////////
87	// Interrupt funktioner
88
89	void recieve_interrupt(void)
90	{
91	unsigned char data = RCREG;
92
93	switch (global_comm_slipstate)
94	{
95	case SlipNormal:
96	if (data == SLIP_END)
97	{
98	global_comm_ready = 1;
99	global_comm_slipstate = SlipStopped;
100	}
101	else if (data == SLIP_ESC)
102	{
103	global_comm_slipstate = SlipEscaped;
104	}
105	else
106	global_comm_buffer[ global_comm_length++ ] = data;
107	break;
108
109	case SlipEscaped:
110	if (data == SLIP_ESCAPED_ESC)
111	{
112	global_comm_buffer[ global_comm_length++ ] = SLIP_ESC;
113	global_comm_slipstate = SlipNormal;
114	}
115	else if (data ==SLIP_ESCAPED_END)
116	{
117	global_comm_buffer[ global_comm_length++ ] = SLIP_END;
118	global_comm_slipstate = SlipNormal;
119	}
120	else
121	{
122	global_comm_slipstate = SlipError;
123	}
124	case SlipError:
125	if (data == SLIP_END)
126	{
127	global_comm_error = 1;
128	global_comm_slipstate = SlipStopped;
129	global_comm_ready = 1;
130	}
131	case SlipStopped: //vi var ikke klar til at modtage data
132	global_comm_error = 1;
133	}
134	}
135
136	/*
137	void transmit_interrupt(void)
138	{
139	RB2 = !RB2;
140	}
141	*/
142	//Timer1 er en 16 bit timer, der k�rer med en 1:8 prescaler,
143	// og er styret fra en ekstern 32768 Hz krystal
144	//N�r at registrene preloades med 0xEFFF vil det resultere i en
145	//timer overflow ca hvert sekund
146	void timer1_interrupt(void)
147	{
148	RB2 = !RB2;
149	TMR1H = 0xEF;
150	TMR1L = 0xFF;
151	}
152	void interrupt interrupt_handler(void)
153	{
154	if (RCIF == 1)
155	{
156	recieve_interrupt();
157	RCIF = 0;
158	}
159	/*if (TXIF == 1)
160	{
161	transmit_interrupt();
162	TXIF = 0;
163	}
164	*/
165
166	if (TMR1IF == 1)
167	{
168	timer1_interrupt();
169	TMR1IF = 0;
170	}
171	}
172
173	///////////////////////////////////////////////////////////////////
174	// Slip funktioner
175
176	void slip_reset(void)
177	{
178	global_comm_error = 0;
179	global_comm_slipstate = SlipNormal;
180	global_comm_ready = 0;
181	global_comm_length = 0;
182	memset(global_comm_buffer, 0, BUFFERLEN);
183	}
184
185	void slip_highlevel_protocol(void)
186	{
187	unsigned char cmd,target,data;
188
189	cmd = global_comm_buffer[0] & 0x0F;
190	target = ( global_comm_buffer[0] >> 4 ) & 0x0F;
191	data = global_comm_buffer[1];
192
193	if (cmd == CmdRead \|\| cmd == CmdWrite)
194	{
195	//s�t standart l�ngde - da l�ngden kun varierer ved l�sning af potmeter
196	if (cmd == CmdRead)
197	global_comm_length = 2;
198	else
199	global_comm_length = 1;
200
201	switch(target)
202	{
203	case TLed3:
204	if (cmd == CmdRead)
205	global_comm_buffer[1] = global_led_0;
206	else
207	global_led_0 = data;
208	break;
209	case TLed4:
210	if(cmd == CmdRead)
211	global_comm_buffer[1] = global_led_1;
212	else
213	global_led_1 = data;
214	break;
215	case TLed5:
216	if (cmd == CmdRead)
217	global_comm_buffer[1] = global_led_2;
218	else
219	global_led_2 = data;
220	break;
221	case TSwitch2:
222	if (cmd == CmdRead)
223	global_comm_buffer[1] = RA4;
224	else
225	global_comm_error = 1;
226	break;
227	case TSwitch3:
228	if (cmd == CmdRead)
229	global_comm_buffer[1] = RB0;
230	else
231	global_comm_error = 1;
232	break;
233	case TPotmeter:
234	if (cmd == CmdRead)
235	{
236	global_comm_buffer[1] = global_potmeter_hi;
237	global_comm_buffer[2] = global_potmeter_lo;
238	global_comm_length = 3;
239	}
240	else
241	global_comm_error = 1;
242	break;
243	case TTemp:
244	if (cmd == CmdRead)
245	global_comm_buffer[1] = global_temp;
246	else
247	global_comm_error = 1;
248	break;
249	case TBaud:
250	if (cmd == CmdRead)
251	global_comm_error = 1;
252	else
253	{
254	//we can only handle 1200,2400,9600,19200
255	if (data == 0 \|\| data == 1 \|\| data == 3 \|\| data == 4)
256	global_reset_baudrate = 1;
257	else
258	global_comm_error = 1;
259	}
260	break;
261	default:
262	global_comm_error = 1;
263
264	}
265	}
266	else //kommandoen var noget andet end read/write
267	{
268	global_comm_error = 1;
269	}
270
271
272	if (global_comm_error == 1) //we saw an error
273	{
274	global_comm_buffer[0] = CmdNAck \| target<<4;
275	global_comm_length = 1;
276	}
277	else
278	{
279	global_comm_buffer[0] = CmdAck \| target<<4; //skriv acknowledge feltet
280	}
281	}
282
283	void slip_send_byte(char data)
284	{
285	TXREG = data;
286	while (TRMT==0) ;
287	DelayUs(20);
288	}
289
290	void slip_send_response(void)
291	{
292	int i;
293	for (i=0; i< global_comm_length;i++)
294	{
295	if ( global_comm_buffer[i] == SLIP_ESC)
296	{
297	slip_send_byte(SLIP_ESC);
298	slip_send_byte(SLIP_ESCAPED_ESC);
299	}
300	else if (global_comm_buffer[i] == SLIP_END)
301	{
302	slip_send_byte(SLIP_ESC);
303	slip_send_byte(SLIP_ESCAPED_END);
304	}
305	else
306	{
307	slip_send_byte( global_comm_buffer[i]);
308	}
309	}
310
311	slip_send_byte(SLIP_END);
312	}
313
314	///////////////////////////////////////////////////////////////////
315	// Gennerelle funktioner
316
317	void interrupt_init(void)
318	{
319	TXIE = 0; //Disable AUX TX interrupt - testes med TXIF;
320	RCIE = 1; //Enable AUX Recieve interrupt - testes med RCIF;
321
322	IPEN = 0; // IPEN=Interrupt Priority ENable bit - her bruges ingen prioritet
323
324	PEIE = 1; // PEIE = PEriphal Interrupt Enable
325
326	TXIF = 0; //nulstil intterupt flag
327	RCIF = 0;
328
329	TMR1IE = 1; // Timer 1
330
331	GIE = 1; //Global interrupt enable bit
332	}
333
334	void serial_init(void)
335	{
336	SPEN = 0; //Make sure serial port is disabled
337
338	// snupset fra Kim H Pedersens serialmain.c
339	// Set Port C bit 6 output (TxD) and bit 7 input (RxD)
340	TRISC6 = 0;
341	TRISC7 = 1;
342
343	SPBRG = 25; // x = Fosc/(16 * Baud Rate) - 1
344	// x = 4000000/(16 * 9600) - 1
345	// x = 25.0417 ~ 25
346	// Baud Rate = Fosc/(16 * (x+1))
347	// Baud Rate = 4000000/(16 * (25+1))
348	// Baud Rate = 9615
349	TXSTA = 0x24; // TXSTA7 = 0 Don't care in asynchronous
350	// TXSTA6 = 0 8-bit transmission
351	// TXSTA5 = 1 Transmit enabled
352	// TXSTA4 = 0 Asynchronous mode
353	// TXSTA3 = 0 Unimplemented
354	// TXSTA2 = 1 High speed
355	// TXSTA1 = 0 TSR empty
356	// TXSTA0 = 0 9th bit */
357	RCSTA = 0x90; // RCSTA7 = 0 Serial port disabled
358	// RCSTA6 = 0 8-bit reception
359	// RCSTA5 = 0 Don't care in asynchronous
360	// RCSTA4 = 1 Receiver enabled
361	// RCSTA3 = 0 Don't care (8-bit operation)
362	// RCSTA2 = 0 No framing error
363	// RCSTA1 = 0 Overrun error bit
364	// RCSTA0 = 0 9th bit */
365
366	//config completed
367	SPEN = 1; //Enable Serial port
368	}
369
370	/* basic I/O ports */
371	void io_init(void)
372	{
373	TRISB3 = 0; //LED ports = output
374	TRISB2 = 0;
375	TRISB1 = 0;
376
377	TRISB0 = 1; //Switch porte = input
378	TRISA0 = 1;
379	}
380
381	void ad_init(void)
382	{
383	// AD Conversion clock
384	ADCS0 = 0;
385	ADCS1 = 0;
386	ADCS2 = 0;
387
388	//Select AN0/RA0 for AD source
389	CHS0=0;
390	CHS1=0;
391	CHS2=0;
392
393	//Only AN0 is selected for AD and with Vdd/Vss as limits
394	PCFG0=0;
395	PCFG1=1;
396	PCFG2=1;
397	PCFG3=1;
398
399	//Result is right justified
400	ADFM=1;
401
402	//Fire up for A/D converter module
403	ADON=1;
404	}
405
406	void i2c_init(void)
407	{
408	// I2C_MODULE h�rer hjemme i i2c.h
409	#ifdef I2C_MODULE
410	SSPMode(MASTER_MODE);
411	SSPEN = 1;
412	CKP = 1;
413	#else
414	SCL_DIR = I2C_OUTPUT;
415	SDA_DIR = I2C_OUTPUT;
416	SDA = 0;
417	SCL = 0;
418	#endif
419	}
420
421	void timer_init(void)
422	{
423	TMR1CS = 1; //use external clock
424
425	T1CKPS1 = 1; //1:8 prescale
426	T1CKPS0 = 1;
427
428	TMR1H = 0xEF;
429	TMR1L = 0xFF;
430
431	T1OSCEN = 1; //enable oscillator circuit
432	RD16 = 0; //normal 8 bit writes
433	TMR1ON = 1;
434	}
435
436	char ReadTemp(void)
437	{
438	char temp;
439	i2c_WriteTo(TC74); //write to, will automatically send a start condition
440	i2c_PutByte(0x00); //tell TC74 we want to read
441	i2c_ReadFrom(TC74);
442	temp = i2c_GetByte(I2C_LAST);
443	i2c_Stop(); //assert a stop condition on SDA & SCL
444	return temp;
445	}
446
447
448	///////////////////////////////////////////////////////////////////
449	//Main
450
451
452	void main(void)
453	{
454	lcd_init(0); //init in 4-bit mode
455	i2c_init();
456	serial_init(); //9600 8N1
457	ad_init();
458	io_init();
459	timer_init();
460	interrupt_init();
461
462
463	slip_reset(); //take SLIP FSM into normal state
464	global_comm_currentrate = Baud9600; //default baudrate = 9600
465	global_reset_baudrate = 0;
466
467	// initialisation completed and we are ready to recieve commands - enable serial reception
468	CREN = 1;
469
470	while (1)
471	{
472	if (global_comm_ready == 1)
473	{
474	slip_highlevel_protocol(); //parse the slip frame recieved & generate response
475	slip_send_response();
476	slip_reset();
477	}
478
479	if ( global_reset_baudrate == 1)
480	{
481	}
482
483	RB1 = global_led_0;
484	// RB2 = global_led_1;
485	RB3 = global_led_2;
486
487	global_temp = ReadTemp();
488
489	//potmeter
490	if (GODONE ==0 )//hvis A/D-conv er f�rdig
491	{
492
493	global_potmeter_hi = ADRESH;//gem AD resultat
494	global_potmeter_lo = ADRESL;
495	GODONE = 1; //start ny konverering
496	}
497	}
498	}