GPIO Interrupts (STPC - Elite)

murphyn · ‎2003-07-18

Posted on July 18, 2003 at 13:30

murphyn · ‎2003-07-14

Posted on July 14, 2003 at 14:10

Chaps,

I've been looking around the datasheets for details on the rising/falling edge interupts on the GPIO port. The Elite Programming Datasheet has registers for programming rising/falling edge interupts, interrupt unmask etc (section 13), but which interrupt is polled?

I'm assuming it's a hardware interrupt.

Anyone Known?

Thanks.

MurF

thierry239955_st · ‎2003-07-18

Posted on July 18, 2003 at 10:49

It is a hardware interrupt but you have to enable and configure it using the chipset register (I/O in 0x22/0x23) number 0x58.

Bit 0-3 = IRQ number with some limitation (IRQ 0, 1, 2, 8 and 13 not possible)

Bit 7 = 1 to enable the interrupt, 0 to disable

For example:

outp( 0x22, 0x58 )

outp( 0x23, 0x89 )

will enable and use the IRQ9

By default, this register is set to 0 and GPIO IRQ is disable.

Farfalla

[ This message was edited by: Farfalla on 13-08-2003 11:05 ]

murphyn · ‎2003-07-18

Posted on July 18, 2003 at 13:30

Most brilliant! Thanks Faralla. Will soon have my interrupts workin!

MurF.