imrasp
commented
6 years ago 8N1 is sent start 1 bit + 8 bit + stop 1 bit
1 float = 4 bytes
1 int64 = 8 bytes
1 int16 = 4 bytesHIGHRES_IMU message has x1 int64, x1 int16, x13 float
= 8 + 4 + 13(4)
= 64 bytes
start 1 bit
message =
stop 1 bit
http://mavlink.org/messages/common HIGHRES_IMU message The IMU readings in SI units in NED body frame
| Field Name | Type | Description |
|---|---|---|
| time_usec | uint64_t | Timestamp (microseconds, synced to UNIX time or since system boot) |
| xacc | float | X acceleration (m/s^2) |
| yacc | float | Y acceleration (m/s^2) |
| zacc | float | Z acceleration (m/s^2) |
| xgyro | float | Angular speed around X axis (rad / sec) |
| ygyro | float | Angular speed around Y axis (rad / sec) |
| zgyro | float | Angular speed around Z axis (rad / sec) |
| xmag | float | X Magnetic field (Gauss) |
| ymag | float | Y Magnetic field (Gauss) |
| zmag | float | Z Magnetic field (Gauss) |
| abs_pressure | float | Absolute pressure in millibar |
| diff_pressure | float | Differential pressure in millibar |
| pressure_alt | float | Altitude calculated from pressure |
| temperature | float | Temperature in degrees celsius |
| fields_updated | uint16_t | Bitmask for fields that have updated since last message, bit 0 = xacc, bit 12: temperature |
teeramoo
seem like time is delay on odroid.
Try to get timestamp of pixhawk message
http://qgroundcontrol.org/mavlink/start MAVLink packet the anatomy of one packet. It is inspired by the CAN and SAE AS-4 standards.