MikroElektronika PIC Microcontrollers PIC18 Bedienungsanleitung PDF herunterladen (Seite 30)

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CAN_TX_PRIORITY_2 Transmit priority 2

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CAN_TX_PRIORITY_3 Transmit priority 3

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CAN_TX_STD_FRAME Standard identifier message

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CAN_TX_XTD_FRAME Extended identifier message

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CAN_TX_NO_RTR_FRAME Non RTR message

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CAN_TX_RTR_FRAME RTR message

These flags can be bitwise AND’ed if desired.

9.11 CAN Bus Programming

To operate the PIC18F258 microcontroller on the CAN bus, perform the following

steps:

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Configure the CAN bus I/O port directions (RB2 and RB3)

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Initialize the CAN module (CANInitialize)

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Set the CAN module to CONFIG mode (CANSetOperationMode)

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Set the mask registers (CANSetMask)

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Set the filter registers (CANSetFilter)

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Set the CAN module to normal mode (CANSetOperationMode)

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Write/read data (CANWrite/CANRead)

PROJECT 9.1—Temperature Sensor CAN

Bus Project

The following is a simple two-node CAN bus–based project. The block diagram of

the project is shown in Figure 9.15. The system is made up of two CAN nodes.

One node (called DISPLAY node) requests the temperature every second and

displays it on an LCD. This process is repeated continuously. The other node

(called COLLECTOR node) reads the temperature from an external semiconductor

temperature sensor.

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MikroElektronika PIC Microcontrollers PIC18 Bedienungsanleitung Seite 30