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doc:crazyradio:usb:index
This is an old revision of the document!
Table of Contents
Usb and Radio protocol of the Crazyradio dongle
The Crazyradio dongle is based on a Nordic semiconductor nRF24LU1 chip. The radio communication is done using the Nordic “Enhanced ShockBurst™” packet protocol with acknoledge. Variable size packet, from 1 to 32 bytes, can be send and acknoledged by the copter. The acknoledgement packet can contains a payload from 0 to 32Bytes.
This page document the protocol used in the version 0.40 of the Crazyradio dongle. Future version (up to 1.0) will be kept compatible.
USB protocol
The USB devices have the VID/PID couple 0x1915/0x7777.
| EP0 | Control | Control endpoint. Used to configure the dongle |
| EP1IN/OUT | Bulk | Data endpoints. Used to send and receive radio packets |
Dongle configuration
Crazyradio vendor requests:
| bmRequestType | bRequest | wValue | wIndex | wLength | data |
|---|---|---|---|---|---|
| 0x40 | SET_RADIO_CHANNEL (0x01) | channel | Zero | Zero | None |
| 0x40 | SET_RADIO_ADDRESS (0x02) | Zero | Zero | 5 | Address |
| 0x40 | SET_DATA_RATE (0x03) | Datarate | Zero | Zero | None |
| 0x40 | SET_RADIO_POWER (0x04) | Power | Zero | Zero | None |
| 0x40 | SET_RADIO_ARD (0x05) | ARD | Zero | Zero | None |
| 0x40 | SET_RADIO_ARC (0x06) | ARC | Zero | Zero | None |
| 0x40 | SET_CONT_CARRIER (0x20) | Active | Zero | Zero | None |
| 0x40 | LAUNCH_BOOTLOADER (0xFF) | Zero | Zero | Zero | None |
Possible values for the datarate:
| Value | Radio datarate |
|---|---|
| 0 | 250Kbps |
| 1 | 1MBps |
| 2 | 2Mbps (Default) |
Data transfer
The radio dongle is configured in PTX mode (in the Nordic terminology) which means that it sends packet to the copter and waits for the acknowledge. The acknowledge can contains a Payload which is the mean to get data from the copter.
The packet is to send is sent to the EP1 and the ack status is then received from the EP1. There are no buffering in the radio dongle, the ACK must be received by the PC before the next packet can be sent.
This protocol permits to transfer about 500 packets per seconds.
Radio protocol
doc/crazyradio/usb/index.1336682259.txt.gz · Last modified: 2015-07-15 16:30 (external edit)
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