Demo: 6TiSCH on SC$µ$M, Running a Synchronized Protocol Stack without Crystals
Résumé
We report the first time-synchronized protocol stack running on a crystal-free device. We use an early prototype of the Single-Chip micro Mote, SC$µ$M, a single-chip 2×3 mm 2 mote-on-a-chip, which features an ARM Cortex-M0 micro-controller and an IEEE802.15.4 radio. This prototype consists of a FPGA version of the micro-controller, connected to the SC$µ$M chip which implements the radio front-end. We port OpenWSN, a reference implementation of a synchronized protocol stack, onto SC$µ$M. we first calibrate the os-cillators by receiving packets via the on-chip optical receiver and RF transceiver so that SC$µ$M can send frames to an off-the-shelf IEEE802.15.4 radio. We then use a digital trimming compensation algorithm based on tick skipping to compensate the frequency converting rounding error. This allows us to run a full-featured standards-compliant 6TiSCH network between one SC$µ$M and one OpenMote, a firm step toward realizing the smart dust vision of ultra-small and cheap ubiquitous wireless devices.
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