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TMS320F28377S: TMS320F28377S GPIO interrupts

jens.kuehner
Prodigy 170 points

Part Number: TMS320F28377S

Hi,

I'm a bit confused about the GPIO interrupt capabilities of the TMS320F28377S DSP.

The only way to force an interrupt through a GPIO input seems to use the input XBAR and map any of the GPIO as source for the XINT. But it seems that only 1 GPIO can be selected as trigger for any XINT. Since there are only 5 external interrupts this means only FIVE of my 176 or so GPIOs can actually cause an interrupt. This seems rather poor.

I'm working on a piece of hardware that provides 10 GPIO inputs for error conditions. Unfortunately these error conditions are not latched but only give short (~100 µsec) low active pulses once an error occurs. It's way to short to active sampling so I wanted to configure interrupts that trigger on a HIGH-LOW transition.

Is there a way to do that or is this just not possible for more than 5 GPIO?

Cheers,

Jens