22/23
© 2022 ROHM Co., Ltd.
No. 64UG116E Rev.002
Feb.2022
User’s Guide
5.1.2
USB performance issues
•
USB communication may miss device data samples
– or the USB connection is lost randomly: Use good quality USB cables which are
USB certified.
•
USB performance is not good on all Windows machines. The root cause is yet unknown.
“EVK Mismatch” – state with the ROHM EVK GUI SW
This error means that the firmware version is not compatible with the board configuration.
NOTE:
This error example issue is limited for RKX-EVK-001 connections.
For example, if the “EVK Mismatch” pop-up window appears you should check the “errorlog.txt”.
If you can find following text in the errorlog.txt:
#######################
[ERROR] EVK Mismatch - state detected:
“board_04ADC_10_RKX-EVK-001_spi_0” does not support the protocol version (2.0) of the firmware.
Supported protocol versions in board config: [
"2.4",
"3.1"
]
########################
ODR accuracy and Timestamping
•
ROHM EVK GUI SW timestamping is done on a PC, and it is not accurate with high ODRs. This influences the delta time statistics.
•
The real-time ODR shown in the ROHM EVK GUI SW may show fluctuating and be off the nominal ODR value. If the value is within
~10% of the nominal value, the behavior is normal and can be due to a combination of factors such as fluctuation of the actual sensor
ODR due to internal oscillator jitter, as well as the timestamping error mentioned above. For cases where the ODR value is either
significantly lower or higher than the nominal value
, and “ODR has not reached the target value” pop-up window appears, see section
(1.6.3 ODR has not reached the target value pop-up window
in ROHM EVK SW User’s Guide) for details.
.NET installation related problem
•
If an error message shown in (Figure 20) appears, the Windows .NET installation is not up-to-date or working as expected. Please run
the Windows update or install the required .Net version manually to resolve the issue.
