Multiwii Read Servo Configuration
Reads the servo configuration from the auto-pilot.
Library
QUARC Targets/Communications/Multiwii
Description
The Multiwii Read Servo Configuration block uses the Multiwii protocol on the input stream to send a command to the aircraft to
read the servo configuration from the auto-pilot. The Multiwii Read Servo Configuration block sends a MSP_SERVO_CONF message to the auto-pilot.
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 outputs of the block are the servo configuration parameters expressed as percentages. In particular, there is the minimum, maximum, middle and rate parameters. The rate parameter is interpreted as a proportional range or a direction, depending on the Treat rate as direction parameter.
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 Read Servo Configuration
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 Read Servo Configuration 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.
rc_rate
A double scalar representing the RC rate, as a percentage between 0 and 1.
min
A double vector representing the minimum for each RC channel, expressed as a percentage between 0 and 1. A value of 0 corresponds to a 1 ms pulse, while a value of 1 corresponds to a 2 ms pulse.
max
A double vector representing the maximum for each RC channel, expressed as a percentage between 0 and 1. A value of 0 corresponds to a 1 ms pulse, while a value of 1 corresponds to a 2 ms pulse.
mid
A double vector representing the middle for each RC channel, expressed as a percentage between 0 and 1. A value of 0 corresponds to a 1 ms pulse, while a value of 1 corresponds to a 2 ms pulse.
rate
A double vector representing the rate for each RC channel, expressed as a percentage between 0 and 1. If the Treat rate as direction option is checked, then it is treated as a direction, where 0 is the positive direction and 1 means the direction is reversed.
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
Treat rate as direction
If this option is unchecked then the rate returned from the Multiwii is treated as a proportional range and is output as a percentage between 0 and 1.
If this option is checked then the first bit of the rate returned from the Multiwii is considered to be a direction bit and the value of the bit is output.
Targets
|
Target Name |
Compatible* |
Model Referencing |
Comments |
|---|---|---|---|
|
Yes |
Yes |
||
|
Yes |
Yes |
||
|
Yes |
Yes |
||
|
Yes |
Yes |
||
|
Yes |
Yes |
||
|
Yes |
Yes |
||
|
Yes |
Yes |
||
|
Yes |
Yes |
||
|
Yes |
Yes |
||
|
Yes |
Yes |
||
|
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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