Smart supermarket toy implementation for Networked Embedded Systems exam on Launchpad CC2650 with contiki-ng
568973f6ec
After reading a frame, `read()` checks the status of the RX FIFO: * If an overflow is detected, the FIFO gets flushed * If there are more frames in the FIFO, the `cc2538_rf_process` will get polled again in order to read out the next frame. #1550 changed `read()`, which now performs the above check for non-poll mode, but it then flushes the FIFO unconditionally. Therefore, if there are two or more frames in the FIFO, they will get flushed before the `cc2538_rf_process` has had a chance to read them out. This results in missed frames. Reproducing this is trivial: Build a CC2538 sniffer and see how it will never show you .15.4 ACK frames. ACK reception completes while `read()` is still streaming the previous captured frame to the host. Upon completion, the FIFO will get flushed and the ACK will get lost. This pull proposes removing the unconditional flush and reverting to the original logic for non-TSCH operation. Pinging @thomas-ha here for input regarding poll mode. This pull sits on top of #1778 |
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The Contiki Operating System
Contiki is an open source operating system that runs on tiny low-power microcontrollers and makes it possible to develop applications that make efficient use of the hardware while providing standardized low-power wireless communication for a range of hardware platforms.
Contiki is used in numerous commercial and non-commercial systems, such as city sound monitoring, street lights, networked electrical power meters, industrial monitoring, radiation monitoring, construction site monitoring, alarm systems, remote house monitoring, and so on.
For more information, see the Contiki website: