Multiwii Attitude
Reads the attitude of the aircraft.
Library
MATLAB Command Line
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qc_open_library('quarc_library/Communications/Multiwii')Description
The Multiwii Attitude block uses the Multiwii protocol on the input stream to read the attitude of the aircraft. It sends
an MSP_ATTITUDE message and receives the reply.
This block is designed to be used with blocking I/O. It is typically used with a stream connected to a serial port. To open the stream a Multiwii Connect block should be used.
The output of the block is the roll and pitch of the aircraft as a 2-vector, and the heading (yaw) as a separate output. The angles and heading are in radians.
A copy of the stream is also output so that the Multiwii blocks may be chained together.
If an error occurs, then the block returns a negative error code at its err output. The Compare to Error block may be used to check for specific error codes. If the stream is not valid because it is not yet connected, the err output will be zero since this condition is expected and the validity of the stream may be checked using the con output of the Multiwii Connect block.
Helpful Hints
Other uses of this block
Although it is intended for use in the main diagram with the other Multiwii
blocks, the Multiwii Attitude block may be used
with the Advanced stream blocks, even in an asynchronous thread.
Input Ports
stm
A reference to the stream created by the Multiwii Connect block. If a connection has not yet been established, then the err output of the Multiwii Attitude block will be zero.
Output Ports
stm
A reference to the stream. This output is merely a copy of the stm input. Providing this output makes it much easier to establish the execution order of Multiwii blocks in the diagram because Simulink generally executes daisy-chained blocks in sequence.
ang
A 2-vector containing the roll and pitch of the aircraft in radians.
head
A scalar representing the heading, or yaw, of the aircraft in radians.
err
An int32 value indicating whether the data was read successfully. This value will be positive if data was read successfully. It will be zero if data could not be read immediately. If an error occurs then this value is a negative error code. See Error Codes for the different error codes and their values. Use the Compare to Error block rather than the error code itself to check for specific error codes. To check for errors in general use the Compare to Zero block to check whether the err output is less than zero.
Parameters and Dialog Box
The Multiwii Attitude block has no parameters.
Targets
|
Target Name |
Compatible* |
Model Referencing |
Comments |
|---|---|---|---|
|
Yes |
Yes |
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|
Yes |
Yes |
||
|
Yes |
Yes |
||
|
Yes |
Yes |
||
|
Yes |
Yes |
||
|
Yes |
Yes |
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Yes |
Yes |
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|
Yes |
Yes |
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|
Yes |
Yes |
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Yes |
Yes |
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|
Yes |
Yes |
||
|
Yes |
Yes |
||
|
Yes |
Yes |
||
|
Yes |
Yes |
Last fully supported in QUARC 2018. |
|
|
Rapid Simulation (RSIM) Target |
Yes |
Yes |
|
|
S-Function Target |
No |
N/A |
Old technology. Use model referencing instead. |
|
Normal simulation |
Yes |
Yes |
See Also
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