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50 lines
3.2 KiB
Markdown
50 lines
3.2 KiB
Markdown
---
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pageClass: is-wide-page
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---
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# RcParameterMap (UORB message)
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**TOPICS:** rc_parameter_map
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## Fields
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| Name | Type | Unit [Frame] | Range/Enum | Description |
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| ----------- | ------------ | ------------ | ---------- | ------------------------------------------------------------------------------------------------- |
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| timestamp | `uint64` | | | time since system start (microseconds) |
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| valid | `bool[3]` | | | true for RC-Param channels which are mapped to a param |
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| param_index | `int32[3]` | | | corresponding param index, this field is ignored if set to -1, in this case param_id will be used |
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| param_id | `char[51]` | | | MAP_NCHAN \* (ID_LEN + 1) chars, corresponding param id, null terminated |
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| scale | `float32[3]` | | | scale to map the RC input [-1, 1] to a parameter value |
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| value0 | `float32[3]` | | | initial value around which the parameter value is changed |
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| value_min | `float32[3]` | | | minimal parameter value |
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| value_max | `float32[3]` | | | minimal parameter value |
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## Constants
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| Name | Type | Value | Description |
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| ----------------------------------------------------- | ------- | ----- | ------------------------------------------------------------------------------ |
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| <a href="#RC_PARAM_MAP_NCHAN"></a> RC_PARAM_MAP_NCHAN | `uint8` | 3 | This limit is also hardcoded in the enum RC_CHANNELS_FUNCTION in rc_channels.h |
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| <a href="#PARAM_ID_LEN"></a> PARAM_ID_LEN | `uint8` | 16 | corresponds to MAVLINK_MSG_PARAM_VALUE_FIELD_PARAM_ID_LEN |
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## Source Message
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[Source file (GitHub)](https://github.com/PX4/PX4-Autopilot/blob/main/msg/RcParameterMap.msg)
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::: details Click here to see original file
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```c
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uint64 timestamp # time since system start (microseconds)
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uint8 RC_PARAM_MAP_NCHAN = 3 # This limit is also hardcoded in the enum RC_CHANNELS_FUNCTION in rc_channels.h
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uint8 PARAM_ID_LEN = 16 # corresponds to MAVLINK_MSG_PARAM_VALUE_FIELD_PARAM_ID_LEN
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bool[3] valid #true for RC-Param channels which are mapped to a param
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int32[3] param_index # corresponding param index, this field is ignored if set to -1, in this case param_id will be used
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char[51] param_id # MAP_NCHAN * (ID_LEN + 1) chars, corresponding param id, null terminated
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float32[3] scale # scale to map the RC input [-1, 1] to a parameter value
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float32[3] value0 # initial value around which the parameter value is changed
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float32[3] value_min # minimal parameter value
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float32[3] value_max # minimal parameter value
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```
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:::
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