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ADSP-BF537 EZ-KIT Lite CAN Transmit Example

Analog Devices, Inc.
DSP Division
Three Technology Way
Norwood, MA 02062

Date Created:	12/10/04

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This directory contains an example ADSP-BF537 project that shows how Port Pins, Interrupts, and
the CAN interface can be configured in C. It also demonstrates how to access the LEDs on the EZ-KIT
Lite. This transmitter example can be used individually or in conjunction with the receiver example.
If used stand-alone, another CAN node must be present on the CAN bus with the same timing and with
the same messaging characteristics.  This example is available for hardware testing of the CAN and
is provided to be used as reference code for setting up the CAN to do simple transmit operations.
More robust examples will be provided in a future tools update.

Files contained in this directory:

readme.txt				This project description file
CAN_TX.dpj			VisualDSP++ project file
main.c				C file containing the main program 
Initialization.c	C file containing all initialization routines
Interrupts.c		C file containing the interrupt service routines for CAN TX, CAN RX, and PORT F
CAN_Functions.c		C file containing CAN-specific Functions
CAN_TX.h			Header file containing prototypes, global data, and macros
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CONTENTS

I.	FUNCTIONAL DESCRIPTION
II.	IMPLEMENTATION DESCRIPTION
III.OPERATION DESCRIPTION

I.    FUNCTIONAL DESCRIPTION

This example demonstrates the initialization of the Port pins, Interrupts, and the CAN interface.

The TX program initializes the CAN to use Mailbox 24 for transmit and Mailbox 7 for receive.  The
push-buttons are configured to generate any of 4 commands (0x01, 0x02, 0x03, 0x04) to be sent to
the receiving CAN node using a message ID of 0x411.  These commands are intended to indicate to
the receiver to perform a specific action.  Upon receipt of a byte into Mailbox 7, the received
byte's value is displayed on the LEDs.

If used with the CAN RX example in VisualDSP++:
PB1 on issues the blink (0x01) command.
PB2 on issues the scroll right (0x02) command.
PB3 on issues the scroll left (0x03) command.
PB4 on issues the turn LEDs off (0x04) command.

If used stand-alone:
PB1 on sends 1 byte (0x01).
PB2 on sends 1 byte (0x02).
PB3 on sends 1 byte (0x03).
PB4 on sends 1 byte (0x04).

II.   IMPLEMENTATION DESCRIPTION

The main file calls the following sub-routines:

1.	Init_PLL()
2.	Init_Port()
3.	Init_Interrupts()
4.	Init_CAN_Timing()
5.	Init_CAN_Mailboxes()
6.	CAN_Setup_Interrupts()
7.	CAN_Enable()

It then executes an endless loop awaiting PORT and CAN Interrupts.

III.  OPERATION DESCRIPTION

- Make sure that switch SW2.4 is turned on (Attaches PJ4 to CAN_RX Pin)
- Make sure that switch SW5.1-4 are turned on (Attaches PFx pins to Push-Buttons)
- Open project "CAN_TX.dpj" in VisualDSP++ Integrated Development Environment (IDDE).
- Under the "Project" tab, select "Build Project" (program is then loaded automatically into DSP).
- Select "Run" from the "Debug" tab on the menu bar of VisualDSP++.
- Pressing PB1-4 on TX board will result in CAN messages being generated.

- If two EZ-KITs are used, CAN TX will display the command sent via push-button interrupt on
  the LEDs when the response comes back from the CAN RX board.