system_power (UORB message)

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uint64 timestamp        # time since system start (microseconds)
float32 voltage5v_v     # peripheral 5V rail voltage
float32[4] sensors3v3       # Sensors 3V3 rail voltage
uint8 sensors3v3_valid      # Sensors 3V3 rail voltage was read (bitfield).
uint8 usb_connected     # USB is connected when 1
uint8 brick_valid       # brick bits power is good when bit 1
uint8 usb_valid         # USB is valid when 1
uint8 servo_valid       # servo power is good when 1
uint8 periph_5v_oc      # peripheral overcurrent when 1
uint8 hipower_5v_oc     # high power peripheral overcurrent when 1
uint8 comp_5v_valid     # 5V to companion valid
uint8 can1_gps1_5v_valid    # 5V for CAN1/GPS1 valid

uint8 BRICK1_VALID_SHIFTS=0
uint8 BRICK1_VALID_MASK=1
uint8 BRICK2_VALID_SHIFTS=1
uint8 BRICK2_VALID_MASK=2
uint8 BRICK3_VALID_SHIFTS=2
uint8 BRICK3_VALID_MASK=4
uint8 BRICK4_VALID_SHIFTS=3
uint8 BRICK4_VALID_MASK=8