MikroElektronika PIC Microcontrollers PIC18 Uživatelský manuál stáhnout pdf (Strana 34)

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CAN BUS EXAMPLE - NODE: DISPLAY

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This is the DISPLAY 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 LCD is connected to PORTC of the microcontroller. The ambient

temperature is read from another CAN node and is displayed on the LCD.

The LCD is connected to the microcontroller as follows:

Microcontroller LCD

RC0 D4

RC1 D5

RC2 D6

RC3 D7

RC4 RS

RC5 EN

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: DISPLAY.C

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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];

lon

id, mask;

Figure 9.17: DISPLAY program listing

www.newnespress.com

508 Chapter 9

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