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line interrupts

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Hello,
I am working with a Starterware's vpif_lcd_loopback example which has been modified for raw capture mode.

Currently,I am interested in using line interrupts.So, at first, I just tried to count them inside the interrupt service routine*,but I am not able to get a logic result.Am I missing something?Any ideas are more than welcome.

*
if (status & VPIF_FRAMEINT_CH1)
    {
        countlines++;
        VPIFInterruptStatusClear(SOC_VPIF_0_REGS, VPIF_FRAMEINT_CH1);
        return;
    }


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