You can do it in C...
The compiler will do nothing automatically (because of the naked
property), so you can do whatever you want w/ the registers in __asm__
statements. And the vector table is set.
Check section "6. Interrupt API" here:
http://mspgcc.sourceforge.net/doc_intro.html
Here's a quick example asm statement that will add two numbers together
(in BCD math):
In this case, there are two globals:
unsigned long int var1, inc1;
__attribute__((naked)) interrupt (BASICTIMER_VECTOR) wakeup
BasicTimerIRQ(void)
{
__asm__( "CLRC \n\t"
"DADD.W %A1, %A0 \n\t"
"DADD.W %B1, %B0 \n\t"
: "=m" (var1)
: "m" (inc1) );
__asm__( "reti" );
}
-Mark
-----Original Message-----
From: [email protected]
[mailto:[email protected]]
Sent: Monday, February 24, 2003 3:44 PM
To: [email protected]
Subject: [Mspgcc-users] assembler interrupts
How can I specify that an assembler function is a particular interrupt
handler. In other words, how to I set the vector table entry in
assembler. I would like to make a timer A interrupt handler in assembly.
I have done it in C, but need more control over the exact register
usage.
