Cypress ez-usb and interrupts

"fw already uses "interrupt 0"

You are missing this pragma is declared at the top of the source code of Cypress examples.

#pragma NOIV    // Do not generate interrupt vector

Then, the USB ISRs on the example don't generate any vector.

Tsuneo

In other words...

void ISR_INT0(void) interrupt 0
{...}

Normally generates the interrupt function and the vector-you need create no assembler code.

However, the NOIV pragma is used in the cypress examples. This pragma instructs the compiler to exclude interrupt vectors (and you must manually create them in assembler).

Jon

Thanks for your help guys!

Maybe I didn't explain myself too well ...
I spotted the NOIV pragma and for this I'd to put some assembler code like this: "CSEG AT 0003H LJMP ISR_INT0".

My doubt was about C code. I can't find documentation about writing ISR with C51, so I can't understand what "interrupt X" means inside declarations like this:

void ISR_INT0(void) interrupt 0
{...}

I see cypress fw already uses "interrupt 0", Do I've to use "interrupt 1"? Can I share "0"? What does mean that number?

Thanks a lot

Dax

I can't find documentation about writing ISR with C51, so I can't understand what "interrupt X" means inside declarations like this

That's easily fixed:

http://www.keil.com/support/man/docs/c51/c51_le_interruptfuncs.htm

"I spotted the NOIV pragma and for this I'd to put some assembler code like this..."

'#pragma NOIV' affects just to the source file on which it is declared.
Make a new source file for your ISR, and you don't need to add the asm code.

Cypress examples uses this pragma to generates a custom jump table for the extended interrupt vectors of the USB ISRs, which is supported by EZ-USB hardware. The interrupt 'number' attached to the USB ISRs has no significance, it is there just to satisfy the syntax.

Tsuneo