PIC/Demo%20trimmet/barcode.c

#include <pic18.h>

#include "barcode.h"


/*************************
 globals
 ************************/
char global_barcode_buffer[14];


/***********************
 module vars 
 *************************/

unsigned char barcode_length;
bit barcode_ready;

/*************************
 function
 *************************/

void barcode_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
        
        //Set module-scope variables
        barcode_length = 0;
        barcode_ready = 0;
        
        //Configure interrupts
        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;

        GIE = 1; //Global interrupt enable bit

}

void barcode_reset(void)
{
        barcode_length = 0;
        barcode_ready = 0;
}

unsigned char barcode_is_ready(void)
{
        return barcode_ready;
}

unsigned char barcode_get_length()
{
        return barcode_length;
}

/* interrupt entry function - barcode is the only module using interrupts */
void /*interrupt*/ barcode_interrupt(void)
{
        char data = RCREG;
        RCIF = 0;
        
        if (barcode_ready == 0)
        {
                if (data == '\r')
                {
                        return;
                }
                else if (data == '\n')
                {
                        barcode_ready = 1;
                }
                else
                {
                        global_barcode_buffer[barcode_length++] = RCREG;
                }
        }

        
}
1	#include <pic18.h>
2
3	#include "barcode.h"
4
5
6	/*************************
7	globals
8	************************/
9	char global_barcode_buffer[14];
10
11
12	/***********************
13	module vars
14	*************************/
15
16	unsigned char barcode_length;
17	bit barcode_ready;
18
19	/*************************
20	function
21	*************************/
22
23	void barcode_init(void)
24	{
25	SPEN = 0; //Make sure serial port is disabled
26
27	// snupset fra Kim H Pedersens serialmain.c
28	// Set Port C bit 6 output (TxD) and bit 7 input (RxD)
29	TRISC6 = 0;
30	TRISC7 = 1;
31
32	SPBRG = 25; // x = Fosc/(16 * Baud Rate) - 1
33	// x = 4000000/(16 * 9600) - 1
34	// x = 25.0417 ~ 25
35	// Baud Rate = Fosc/(16 * (x+1))
36	// Baud Rate = 4000000/(16 * (25+1))
37	// Baud Rate = 9615
38	TXSTA = 0x24; // TXSTA7 = 0 Don't care in asynchronous
39	// TXSTA6 = 0 8-bit transmission
40	// TXSTA5 = 1 Transmit enabled
41	// TXSTA4 = 0 Asynchronous mode
42	// TXSTA3 = 0 Unimplemented
43	// TXSTA2 = 1 High speed
44	// TXSTA1 = 0 TSR empty
45	// TXSTA0 = 0 9th bit
46	RCSTA = 0x90; // RCSTA7 = 0 Serial port disabled
47	// RCSTA6 = 0 8-bit reception
48	// RCSTA5 = 0 Don't care in asynchronous
49	// RCSTA4 = 1 Receiver enabled
50	// RCSTA3 = 0 Don't care (8-bit operation)
51	// RCSTA2 = 0 No framing error
52	// RCSTA1 = 0 Overrun error bit
53	// RCSTA0 = 0 9th bit
54
55	//config completed
56	SPEN = 1; //Enable Serial port
57
58	//Set module-scope variables
59	barcode_length = 0;
60	barcode_ready = 0;
61
62	//Configure interrupts
63	TXIE = 0; //Disable AUX TX interrupt - testes med TXIF;
64	RCIE = 1; //Enable AUX Recieve interrupt - testes med RCIF;
65
66	IPEN = 0; // IPEN=Interrupt Priority ENable bit - her bruges ingen prioritet
67
68	PEIE = 1; // PEIE = PEriphal Interrupt Enable
69
70	TXIF = 0; //nulstil intterupt flag
71	RCIF = 0;
72
73	GIE = 1; //Global interrupt enable bit
74
75	}
76
77	void barcode_reset(void)
78	{
79	barcode_length = 0;
80	barcode_ready = 0;
81	}
82
83	unsigned char barcode_is_ready(void)
84	{
85	return barcode_ready;
86	}
87
88	unsigned char barcode_get_length()
89	{
90	return barcode_length;
91	}
92
93	/* interrupt entry function - barcode is the only module using interrupts */
94	void /interrupt/ barcode_interrupt(void)
95	{
96	char data = RCREG;
97	RCIF = 0;
98
99	if (barcode_ready == 0)
100	{
101	if (data == '\r')
102	{
103	return;
104	}
105	else if (data == '\n')
106	{
107	barcode_ready = 1;
108	}
109	else
110	{
111	global_barcode_buffer[barcode_length++] = RCREG;
112	}
113	}
114
115
116
117
118	}