UMX FLIP Installation Guide download pdf (Page 49)

case 0x6:

VitDesCRC18(pRxContextA);

break;

case 0x1:

VitDesCRC24(pRxContextA);

break;

case 0x5:

VitDesCRC36(pRxContextA);

break;

case 0x0:

VitDesCRC48(pRxContextA);

break;

case 0x4:

VitDesCRC54(pRxContextA);

break;

}

_mm_mfence();

BB11A_VITERBIDONE_SET_EVENT(pRxContextA);

}

Figure 24. Example ethread routine.

5.2 Interrupt affinity

With ethread, the SDR application driver can prevent the task from being preempted by other

threads. But the task may still be interrupted by hardware. Although most hardware interrupt

handlers are very light-weight, some may still require a significant amount of time to finish (e.g.,

disk access) and thus cause a real-time task to miss deadlines. To address this issue, one could

set the interrupt affinity for all hardware devices to avoid sending interrupts to the reserved

core. On Windows 7, the interrupt affinity can be configured via the registry. But there is no

native support on Windows XP. The Sora SDK includes a tool, called interrupt filter, which can

configure the interrupt affinity of hardware devices. The tool can be found in %SDR_ROOT%\bin

folder.

5.2.1 Installing and Configuring Interrupt Filter

To install the interrupt filter driver, first copy intfiltr.sys to Windows system driver folder (e.g.,

c:\windows\system32\drivers). Then, add the registry entries specified in intfiltr.reg, and, finally,

reboot the machine to enable the interrupt filter driver.

D:\SoraSDK\bin>IntFiltrCmd.exe

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UMX FLIP Installation Guide Page 49