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doc:crazyradio:usb:index [2012-03-28 20:44]
arnaud created 		doc:crazyradio:usb:index [2012-05-10 22:37]
arnaud
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 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. 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 0.33 of the Crazyradio dongle. Future version (up to 1.0) will be kept compatible.+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 ===== ===== USB protocol =====
  
-The USB devices have the VID/PID couple 0x1915/0x7777. Two bulk endpoint are configured:+The USB devices have the VID/PID couple 0x1915/0x7777.
  
 | EP0 | Control | Control endpoint. Used to configure the dongle | | EP0 | Control | Control endpoint. Used to configure the dongle |
-| EP1 | Bulk    | Data endpoint. Used to send and receive radio packets |+| EP1IN/OUT | Bulk    | Data endpoints. Used to send and receive radio packets |
  
 ==== Dongle configuration ==== ==== 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 ==== ==== Data transfer ====
  
-===== Radio protocol =====+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.
 +
 +<ditaa>
 +                       1..32Bytes
 +               <------------------------>
 +              +-------------------------+
 +To EP1_OUT:   | Packet to be transmited |
 +              +-------------------------+
 +                           1..32 Bytes
 +               1Byte <-------------------->
 +              +-----+----------------------+
 +From EP1_IN:  | Ack | Ack payload received |
 +              +-----+----------------------+
 +</ditaa>
 +
 +This protocol permits to transfer about 500 packets per seconds.
 +===== Radio protocol =====
  
  
  
doc/crazyradio/usb/index.txt · Last modified: 2020-05-12 14:12 by kimberly

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