Cirrus Logic CRD5490 - Manual (Page 10)

CRD5490-Z
10 DS988RD1
3.3.1 Connection Tab
The Connection tab displays the USB communication with CRD5490-Z board. At startup, the GUI attempts to
establish a connection to the CRD5490-Z to the PC through the last USB device connected.
Once the USB communication has been established, the CS5490 serial port will report the Device Revision on the
Connection tab. If the software is unable to establish a communication link with the CRD5490-Z board, a message
is displayed indicating that the initial communication has failed. This message is displayed in Figure 8.
3.3.1.1 Common Causes of Communication Error
• No AC power
• USB cable is not connected
• USB cable to the CRD was not the last device connected before loading the GUI
• Windows is not given time to recognize the device and assign a serial port
• The wrong serial port is assigned because the GUI was loaded before the above items were met
3.3.1.2 Fixing Communication Problems
1. Close the GUI.
2. Remove the power to the CRD5490-Z by turning off the AC source.
3. Remove the power to the MCU by removing the USB cable from the PC.
4. Check that the AC power connections are secure.
5. Connect the USB cable to the PC.
6. Wait for Windows to detect the CDC Device. Verify the port by opening the Device Manager and reviewing the
port assignments (run “devmgmt.msc” at a command prompt or Windows 7 search).
7. Apply AC power and wait a second.
8. Reload the GUI.
Figure 8. Connection Tab with Communication Error Displayed