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IEEE 802.15.4 subsystem, IEEE 802.15.4 Low-Rate Wireless Personal Area Network (WPAN)
http://projects.qi-hardware.com/index.php/p/ben-wpan/
42483d67b4
At an interrupt barrier, the host must be able to ensure that no interrupt generated before reaching the barrier is still pending and will be delivered after crossing the barrier. For this, we introduce the following concept: - interrupts have a serial number. This number is sent to the host on EP 1 (currently bulk) to signal the interrupt, instead of the zero byte we used previously. - the new request ATUSB_SPI_WRITE2_SYNC returns the interrupt serial number from after the register write (the register write itself is the interrupt barrier). - the host can now check if the serial indicated from bulk and the serial from ATUSB_SPI_WRITE2_SYNC are the same. If yes, interrupts are synchronized. If not, it has to wait for the interrupt to be signaled on EP 1. We should also consider the case that the interrupt serial has gotten ahead of ATUSB_SPI_WRITE2_SYNC. But that seems to happen rarely. In any case, it's something for the host driver to worry about, not for the firmware. - board.h (irq_serial), board_app.c (irq_serial, INT0_vect): count the interrupt serial number and return it when signaling the interrupt - include/atusb/ep0.h (ATUSB_SPI_WRITE2_SYNC), ep0.c (my_setup): new request ATUSB_SPI_WRITE2_SYNC that does a register write, then returns the interrupt serial |
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IEEE 802.15.4 Low-Rate Wireless Personal Area Network (WPAN) ============================================================ IEEE 802.15.4 defines physical layers and a media access control for wireless networks. ZigBee and 6loWPAN are based on IEEE 802.15.4. This project aims to add experimental WPAN functionality to the Ben NanoNote, in order to permit evaluation of overall network performance and to examine possible integration into future devices. This work is licensed under the terms detailed in the file COPYING. Hardware architecture --------------------- IEEE 802.15.4 transceiver chips are available from several manufacturers, including Atmel, Freescale, and Texas Instruments. These chips are similar in size, functionality, and cost. The first prototype is based on the Atmel AT86RF230. The RF module will be physically placed on the left side of the LCD module, replacing part of the display's PCB. When installed in the Ben, the transceiver will connect directly via SPI to the Jz4720. For development, a SiLabs C8051F326 microcontroller implements a USB to SPI conversion.