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CRSF_FRAMETYPE_MSP_REQ

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Bryan Mayland edited this page Mar 13, 2024 · 3 revisions

Extended Packet

MSP Request

MSP is the foundation of transferring arbitrary external data into and out of a CRSF system. CRSF_FRAMETYPE_MSP_REQ is the request type packet, meaning the sender is requesting an MSP function and is expecting a CRSF_FRAMETYPE_MSP_RESP message of the same MSP function in return. Note that CRSF-encapsulated-MSP does not follow the same format as UART-based plain MSP (no $M>...).

Extended payload (MSPv2)

  • uint16_t MSP flags - e.g. 0x50 0x00 = No error, version 2, beginning of frame, first frame
  • uint16_t function - Parameter ID of MSP request. e.g. 0x88 0x00 = MSP_VTX_CONFIG
  • uint16_t payload length - Length of payload following this header (does not include this or above fields). Usually 0 for a CRSF_FRAMETYPE_MSP_REQ.
  • uint8_t payload[]
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