Oki JOB60851 4-3-8. Note on Porting

Chapter 4 Software Development

page 4-21

A bus monitor also comes in handy during host driver development when the personal computer

hangs, making it impossible to pinpoint the exact circumstances producing the failure.

Bus monitor data is also highly effective in tracing host controller operation and evaluating the

final product.

As of August 1999, the following bus monitors are commercially available.

Products: CATC USB Chief™ Bus & Protocol Analyzers

CATC USB Inspector™ Bus & Protocol Analyzer

Developer: Computer Access Technology Corporation (CATC)

http://www.catc.com/

http://www.toyo.co.jp/

Product: Genoa Technology USB Expert™ Protocol Analyzer

Product: Genoa Technology, Incorporated.

http://www.gentech.com/

http://www.bits.co.jp/

(2) Microcontroller emulator

The JOB60851 Starter Kit provides printf(), scanf(), and other C standard I/O library functions

for confirmation of operation and simple debugging of programs running on its MSM66Q573

microcontroller. Thorough debugging with program tracing and other facilities for illuminating

firmware problems, however, requires an emulator (in-circuit emulator, ROM emulator, etc.)

for the target microcontroller. Look for such tools from the microcontroller vendor and third-

party sources.

4-3-8. Note on Porting

JOB60851 programming uses a version of the C programming language extended for embedded

applications. The following is a list of extension requiring special attention when porting the sample

firmware to other microcontrollers and compilers. For further details on these language extension,

refer to the compiler manual (Cc665s.pdf) and programming guide (Pg665s.pdf) on the CD-ROM.

(1) #pragma ABSOLUTE variable_name address

This pragma permits specification of the final absolute address for a variable at the C source

code level.

(2) #pragma ACAL function_name

This pragma calls the specified function with the more efficient ACAL instruction instead of the

normal CAL instruction--provided that the function starts at an address between 1000h and

17ffh. Delete or disable these pragmas when porting the source code to a different

microcontroller.

(3) #pragma INTERRUPT function_name vector

This pragma makes the specified function into an interrupt service routine by assigning its entry

point to a vector table entry. This microcontroller has separate interrupt vectors for various

internal and external interrupts. The sample firmware, however, uses only external interrupts

from the USB controller.