Real-time capabilities are required for a controller of a large format array to reduce a dead-time attributed by readout and
data transfer. The real-time processing has been achieved by dedicated processors including DSP, CPLD, and FPGA
devices. However, the dedicated processors have problems with memory resources, inflexibility, and high cost.
Meanwhile, a recent PC has sufficient resources of CPUs and memories to control the infrared array and to process a
large amount of frame data in real-time. In this study, we have developed an infrared array controller with a software
real-time operating system (RTOS) instead of the dedicated processors. A Linux PC equipped with a RTAI extension
and a dual-core CPU is used as a main computer, and one of the CPU cores is allocated to the real-time processing. A
digital I/O board with DMA functions is used for an I/O interface. The signal-processing cores are integrated in the OS
kernel as a real-time driver module, which is composed of two virtual devices of the clock processor and the frame
processor tasks. The array controller with the RTOS realizes complicated operations easily, flexibly, and at a low cost.