LX51: USING LX51 IN A CODE BANKED APPLICATION WITH STM UPSD3XXX

Information in this article applies to:

• C51 All Versions

QUESTION

I want to use the LX51 linker instead of BL51 in a µVision project for a STMicroelectronics uPSD3xxx device. This application uses code banking. When I select Use Extended Linker (LX51) instead of BL51 in the Options for Target - Device dialog, I get an OHX51 error message and downloading this application fails. What do I need to do to make the project work with LX51.

ANSWER

There are two things to consider when you want to use LX51 in an application that uses code banking with a STMicroelectronics uPSD3xxx device.

1. You need to select HEX-386 in the Options for Target - Output - HEX Format because the address range of the resulting HEX file will be bigger than 64K. When LX51 is used, µVision generates one HEX file for all code banks rather than a separate HEX file for each code bank. The link below explains how the code banks are mapped into the HEX file when using the LX51.
2. The PSDsoft project needs to be adapted to merge a different HEX file containing different address ranges with the PSD configuration.
   The following example shows a possible PSDsoft merge configuration when BL51 or LX51 is used. Let's assume the common area should be located in Flash sector CSBOOT0-3 (0x0000-0x7FFF) and the code banks in Flash sector FS0-7 (0x8000 - 0xFFFF).
   PSDsoft Merge settings with BL51:
   

     Memory     File          File          File Name
     Select     Address       Address
     Name       Start (hex)   Stop (hex)
     FS0         008000        00FFFF      ..\MyApp.h00
     FS1         008000        00FFFF      ..\MyApp.h01
     FS2         008000        00FFFF      ..\MyApp.h02
     FS3         008000        00FFFF      ..\MyApp.h03
     FS4         008000        00FFFF      ..\MyApp.h04
     FS5         008000        00FFFF      ..\MyApp.h05
     FS6         008000        00FFFF      ..\MyApp.h06
     FS7         008000        00FFFF      ..\MyApp.h07
   
     CSBOOT0     000000        001FFF      ..\MyApp.h00
     CSBOOT1     002000        003FFF      ..\MyApp.h00
     CSBOOT2     004000        005FFF      ..\MyApp.h00
     CSBOOT3     006000        007FFF      ..\MyApp.h00
   

   PSDsoft Merge settings with LX51:

     Memory     File          File          File Name
     Select     Address       Address
     Name       Start (hex)   Stop (hex)
     FS0         008000        00FFFF      ..\MyApp.hex
     FS1         018000        01FFFF      ..\MyApp.hex
     FS2         028000        02FFFF      ..\MyApp.hex
     FS3         038000        03FFFF      ..\MyApp.hex
     FS4         048000        04FFFF      ..\MyApp.hex
     FS5         058000        05FFFF      ..\MyApp.hex
     FS6         068000        06FFFF      ..\MyApp.hex
     FS7         078000        07FFFF      ..\MyApp.hex
   
     CSBOOT0     000000        001FFF      ..\MyApp.hex
     CSBOOT1     002000        003FFF      ..\MyApp.hex
     CSBOOT2     004000        005FFF      ..\MyApp.hex
     CSBOOT3     006000        007FFF      ..\MyApp.hex
   

     

SEE ALSO

LX51: GENERATING HEX FILES FOR BANKED APPLICATIONS

Last Reviewed: Thursday, December 15, 2005