topic Re: External Interrupt for P2041 in P-Series

External Interrupt for P2041

pabloramos — Fri, 21 Feb 2014 16:11:36 GMT

Good morning,

I want to perform an external interrupt (that could be a handled by microcontroller output) to my P2041 RBD board but I can't find any information about how to do that.

I supposed that I have to use the GPIO header (J7) to enter an interrupt signal, but I don't know how to use it.

Do you have any information or an example of how to do an external interrupt using gpio in P2041 board?

Thank you very much in advance for your help.

Pablo Ramos

Re: External Interrupt for P2041

LPP — Tue, 25 Feb 2014 12:18:11 GMT

This RDB board doesn't provide external connections for interrupts. Most P2041 IRQs and GPIOs are allocated for different functions on the board.

For example, IRQ4 and IRQ5 are routed to PCIe slot1/2 connectors.

J7 GPIO expansion header is for PCA9672 I/O expansion via I2C bus.

The PCA9672 does provide interrupt capability. The interrupt is generated at any rising or falling edge of the port inputs. Though, the interrupt request is removed when data is read or written by the I2C master. Consequently, the speed of interaction is limitted by the I2C.

Re: External Interrupt for P2041

pabloramos — Wed, 26 Feb 2014 08:51:16 GMT

Thank you very much for your answer.

So, if I can not use external interrupts, I wonder if you could help

me in another topic. I'm trying to perform decrementer interrupt over

P2041RDB but there is not enough information on how to program it.

Do you have any C or assembly code for performing decrementer interrup.

Thanks in advance.

Best regards,

Pablo

Quoting LPP <admin@freescale-phx.hosted.jivesoftware.com>:

LPP

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Re: External Interrupt for P2041

LPP — Thu, 27 Feb 2014 10:28:02 GMT

I found your Service Request on this topic. Hope, the answer is satisfactory.