Embedded Target for Motorola MPC555

Boot Code Parameters for CAN Download

The boot code parameters for download over CAN determine

• CAN baud rate
• CAN message identifier for Command Receive Objects (CRO)
• CAN message identifier for Data Transmit Objects (DTO)
• Can Calibration Protocol Station Address
• The duration of the window during which the boot code listens for a download command message

Table 3-1 shows the default values for these parameters. These defaults should be suitable for most applications.

Table 3-1: Default Boot Code Parameters

Parameter	Default Value
CAN baud rate	500,000
CCP station address	1
CAN message identifier (CRO)	6FA
CAN message identifier (DTO)	6FB
Duration of listening window	40 ms

You cannot change these default values except by modifying and recompiling the boot code. If it is absolutely necessary to do this, you can recompile the boot code as follows:

1. Open a PC Command Prompt window.
2. Check whether you have the environment variables MATLABROOT and DIABROOT defined by typing

• set MATLABROOT
  set DIABROOT
  

3. If these variables are not defined you must define them by typing the following commands:

• set MATLABROOT=matlabroot
  set DIABROOT=diabpath
  

The paths matlabroot and diabpath specified in the commands should be the location where MATLAB and the Diab compiler are installed.

4. Recompile the boot code by typing the following at the PC Command Prompt:

• cd matlabroot/toolbox/rtw/targets/mpc555dk
  matlabroot/rtw/bin/win32/gmake -f rt_makefile
  

Note    You should not make changes to the boot code without fully understanding the effect of your changes. Note also that the boot code may be changed without notice in future releases of this product.

Downloading Boot or Application Code via CAN Without Manual CPU Reset

Generating ASAP2 Files