講演情報
[15a-WL1_301-3]Demonstration of Intermittently Operated Stateless RISC-V based digital platform for IoT
〇(D)Panithan Srisinsuphya1, Yasufumi Yokoshiki2, Masato Saito1, Takashi Tokuda1 (1.Inst. of Sci. Tokyo, 2.Aoyama Gakuin Univ.)
キーワード：
intermittent computing、Energy Harvesting、Digital Platform
Energy-harvesting IoT systems suffer from intermittent power, making conventional computing unreliable and complex due to the need for non-volatile state memory and checkpointing. This work demonstrates a stateless edge-computing platform that always restarts from a known reset state without preserving execution state. A prototype consisting of an optically powered harvesting node, capacitor-based energy storage, a power management and clock generation unit, a custom RISC-V CPU, and a PIC-based bootloader is implemented. The system starts operation at 3.0 V and shuts down at 1.4 V while supplying 1.8 V to the digital core. Reliable and repeatable operation is confirmed over 308 cycles using a deterministic output pattern. The charging behavior under different illumination levels is also evaluated, showing a power-law dependence between charge time and illumination intensity. These results demonstrate the feasibility of stateless RISC-V platforms for intermittently powered IoT devices.