MikroElektronika PIC Microcontrollers PIC18 Manual de usuario descargar pdf (Pagina 37)

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CAN BUS EXAMPLE - NODE: COLLECTOR

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This is the COLLECTOR node of the CAN bus example. In this project a

PIC18F258 type microcontroller is used. An MCP2551 type CAN bus transceiver

is used to connect the microcontroller to the CAN bus. The microcontroller is

operated from an 8MHz crystal with an external reset button.

Pin CANRX and CANTX of the microcontroller are connected to pins RXD

and TXD of the transceiver chip respectively. Pins CANH and CANL of the

transceiver chip are connected to the CAN bus.

An LM35DZ type analog temperature sensor is connected to port AN0 of the

microcontroller. The microcontroller reads the temperature when a request is

received and then sends the temperature value as a byte to Node:DISPLAY on

the CAN bus.

CAN speed parameters are:

Microcontroller clock: 8MHz

CAN Bus bit rate: 100Kb/s

Sync_Seg: 1

Prop_Seg: 6

Phase_Seg1: 6

Phase_Seg2: 7

SJW: 1

BRP: 1

Sample point: 65%

Author: Dogan Ibrahim

Date: October 2007

File: COLLECTOR.C

void main()

{

unsigned char temperature, data[8];

unsigned short init_flag, send_flag, dt, len, read_flag;

char SJW, BRP, Phase_Seg1, Phase_Seg2, Prop_Seg, txt[4];

unsigned int temp;

unsigned long mV;

long id, mask;

TRISA = 0xFF; // PORTA are inputs

TRISB = 0x08; // RB2 is output, RB3 is input

/ Configure A/D converter

ADCON1 = 0x80;

Figure 9.18: COLLECTOR program listing

(Continued)

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