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5.1 FAQ

1：USB Driver installation failed​

If the computer operating system is Windows XP, Win7 or Win8, and is not the official original version, but a lite system, you may encounter installation failure problems, you can search for "ST Virtual Serial Driver Installation Failure" to get a solution, do not select the actual system does not match the driver to install, if necessary, contact technical support. Do not choose a driver that does not match your actual system, and contact technical support if necessary.

2：ICWKEY connection judgment​

Ensure that the ICWKEY Client and ICWKEY are disconnected (not paired), ICWKEY is plugged into the PowerWriter's USB socket, and the buzzer will beep twice to indicate a successful connection.

3：Validating Signed Data​

When the PowerWriter burns successfully, the green indicator light will be on. If the user is worried that the burned data is not the same as expected, in case the chip does not have read protection turned on, the user can use PowerWriter.exe or other tools to verify the target chip, or read back the data to observe if the data is the same as the original file.

4：Failed during debugging​

The signature information is programmed by PowerWriter, and there is no authorization data during debugging, so the checksum cannot be passed, please refer to the ECDSA Sample & Matrix Sample。

5：Signature data length​

  • Matrix : The length is normally 12 bytes, follow the setting, you can set 4 bytes, 8 bytes, 12 bytes.
  • ECDSA: Not more than 141 bytes in length.

6：Programming Failure Reasons​

  • Wiring problems: wrong wiring, loose wiring.
  • Configuration error: The selected chip does not match the target chip.
  • Count Exhaustion: The count set by PowerWriter or ICWKEY is exhausted.
  • Disable burn-in: The target chip has turned off the burn-in function, for example, the secondary read protection is turned on, and JTAG &serial wire has been disabled.
  • Pin reuse: the burn IO is changed to normal IO by the program, try to connect the RESET pin and use the under reset mode to burn.
  • Insufficient power supply: Low voltage may cause a burn failure.

7：Cannot reprogram after programming​

It may be that the target chip has read protection turned on.