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Chapter 9 Separate ROMs
- 147 -
App_prog
MR_CIF
MR_ROM
program
MR_KERNEL
kernel ROM
(Internal ROM)
Application ROM1
App_prog
MR_CIF
MR_ROM
Startup
Program
MR308 kernel
Task of ID=1
Fix Interrupt
Vector area
MR308’s ROM
data
C language I/F routine
Interrupt vector area
Task4
Task3
MR308’s ROM
data
C language I/F routine
Interrupt vector area
Task3
Task2
application change
Use Function
: Mailbox
: Eventflag
: semaphore
Number of Task5
Task2
Task1
Use Function
: Mailbox
: Eventflag
Number of Task4
Task4
Application ROM2
Figure 9.1 ROM separate
• Programs to be located in the application ROM
♦ MR308's ROM data (the MR_ROM section)
♦ C language I/F routines (the MR_CIF section)
♦ Application programs (the app_prog section)
♦ Interrupt vector area (the INTERRUPT_VECTOR section)
• How to locate individual programs is given below.
♦ Changing the section name of user program
In dealing with application programs written in C language, you change the section name of the pro-
grams to be located in the application ROM by use of #pragma SECTION as shown below. In
NC308WA, the section name of user program, if not given, turns to program section. So you need to
assign a different section name to the task you locate in the application ROM.
64
#pragma SECTION program app_prog/* Changing section of program */
/* The section names of task2 and task3 turn to app_prog */
void task2(void){
:
}
void task3(void){
:
}
♦ Locating sections
64
You need not change the names of sections for tasks to be located int the kernel ROM.