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
                                        */
                                        
        SPBRG = 130; //BRG værdi for 20Mhz MCU
    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	*/
39
40	SPBRG = 130; //BRG værdi for 20Mhz MCU
41	TXSTA = 0x24; // TXSTA7 = 0 Don't care in asynchronous
42	// TXSTA6 = 0 8-bit transmission
43	// TXSTA5 = 1 Transmit enabled
44	// TXSTA4 = 0 Asynchronous mode
45	// TXSTA3 = 0 Unimplemented
46	// TXSTA2 = 1 High speed
47	// TXSTA1 = 0 TSR empty
48	// TXSTA0 = 0 9th bit
49	RCSTA = 0x90; // RCSTA7 = 0 Serial port disabled
50	// RCSTA6 = 0 8-bit reception
51	// RCSTA5 = 0 Don't care in asynchronous
52	// RCSTA4 = 1 Receiver enabled
53	// RCSTA3 = 0 Don't care (8-bit operation)
54	// RCSTA2 = 0 No framing error
55	// RCSTA1 = 0 Overrun error bit
56	// RCSTA0 = 0 9th bit
57
58	//config completed
59	SPEN = 1; //Enable Serial port
60
61	//Set module-scope variables
62	barcode_length = 0;
63	barcode_ready = 0;
64
65	//Configure interrupts
66	TXIE = 0; //Disable AUX TX interrupt - testes med TXIF;
67	RCIE = 1; //Enable AUX Recieve interrupt - testes med RCIF;
68
69	IPEN = 0; // IPEN=Interrupt Priority ENable bit - her bruges ingen prioritet
70
71	PEIE = 1; // PEIE = PEriphal Interrupt Enable
72
73	TXIF = 0; //nulstil intterupt flag
74	RCIF = 0;
75
76	GIE = 1; //Global interrupt enable bit
77
78	}
79
80	void barcode_reset(void)
81	{
82	barcode_length = 0;
83	barcode_ready = 0;
84	}
85
86	unsigned char barcode_is_ready(void)
87	{
88	return barcode_ready;
89	}
90
91	unsigned char barcode_get_length()
92	{
93	return barcode_length;
94	}
95
96	/* interrupt entry function - barcode is the only module using interrupts */
97	void /interrupt/ barcode_interrupt(void)
98	{
99	char data = RCREG;
100	RCIF = 0;
101
102	if (barcode_ready == 0)
103	{
104	if (data == '\r')
105	{
106	return;
107	}
108	else if (data == '\n')
109	{
110	barcode_ready = 1;
111	}
112	else
113	{
114	global_barcode_buffer[barcode_length++] = RCREG;
115	}
116	}
117	}