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UM1744 User manual STEVAL- MKI121V1 communication protocol Introduction The scope of this user manual is to present the communication protocol used between the STEVAL-MKI121V1 product evaluation board (Discovery-M1) and the iNEMO SDK (Software Development Kit). This communication protocol runs upon a physical communication channel based on USB virtual COM, which represents the physical channel used in the communication between the STEVAL-MKI121V1 and the PC. The first chapter explains the general frame format and main rules used in the protocol. The second chapter explains all the frames used in the actual release of the embedded firmware and Software Development Kit (SDK). May 2014 DocID026205 Rev 1 1/37 www.st.comContents UM1744 Contents 1 General frame format and protocol rules 4 1.1 Frame format . 4 1.1.1 Frame control field 4 1.1.2 Length field . 6 1.1.3 Message ID field . 6 1.2 Protocol rules . 6 2 STEVAL-MKI121V1 frames 8 2.1 STEVAL-MKI121V1 frame types 8 2.2 Communication control frames 8 2.2.1 iNEMO Connect . 9 2.2.2 iNEMO Disconnect . 9 2.2.3 iNEMO Reset . 9 2.2.4 iNEMO Enter DFU Mode 10 2.2.5 iNEMO Trace 11 2.2.6 iNEMO Led Control . 11 2.3 Board information frames 11 2.3.1 iNEMO Get MCU ID 13 2.3.2 iNEMO Get FW Version . 13 2.3.3 iNEMO Get HW Version . 14 2.3.4 iNEMO Identify . 14 2.3.5 iNEMO Get AHRS Library . 14 2.3.6 iNEMO Get Libraries 15 2.3.7 iNEMO Get Available Sensors 15 2.4 Sensor setting frames . 16 2.4.1 iNEMO Set Sensor Parameter 17 2.4.2 iNEMO Get Sensor Parameter 18 2.4.3 iNEMO Restore Default Parameter 18 2.4.4 iNEMO Save to Flash . 19 2.4.5 iNEMO Load from Flash . 20 2.4.6 AccelerometerSensor Paramete field . 20 2.4.7 Accelerometer Output Data rate . 21 2.4.8 Accelerometer full scale . 21 2.4.9 Accelerometer high-pass filter 22 2/37 DocID026205 Rev 1
