Unlock procedure for EFM32LG995F256

Hello Psihuki,

Thank you for using the Keil tools for Arm devices.

You said you cannot load the code onto the device. Can you do a flash erase?

From the screenshot you sent, it looks like this is only possible to write to the AAP registers during flash erasing. The flash algorithm provided with the CMSIS-PACK is probably located on your drive at  C:\Keil_v5\ARM\PACK\SiliconLabs\EFM32LG_DFP\5.7.0\Flash

It does not look like Silicon Lab provided any source code for the flash programming algorithm, so unless you contact them directly (and see if they will give you the source code) there probably is not a simple way to change those registers.

(If you contacted Silicon labs, I suspect they will tell you to use their GUI to unlock the device. )

If you really want to try (and this is speculation, since I usually just use their GUI)

... you could try creating a Pre-Download Script

... and include it under Options for Target — Utilities — Init File

... you would have to uncheck Program in the Flash Download Setup dialog and press OK.

... in that script file you could use the "Load" debug command,

... finally, you could try the _WDWORD to set the AAP registers.

To get an idea of what such a script would look like, it would probably be the opposite of this one, where you do the load command first, then use the _WDWORD commands to write values to registers.

Good luck. Let us know what solution ultimately worked for you.

Hello Psihuki,

Thank you for using the Keil tools for Arm devices.

You said you cannot load the code onto the device. Can you do a flash erase?

From the screenshot you sent, it looks like this is only possible to write to the AAP registers during flash erasing. The flash algorithm provided with the CMSIS-PACK is probably located on your drive at  C:\Keil_v5\ARM\PACK\SiliconLabs\EFM32LG_DFP\5.7.0\Flash

It does not look like Silicon Lab provided any source code for the flash programming algorithm, so unless you contact them directly (and see if they will give you the source code) there probably is not a simple way to change those registers.

(If you contacted Silicon labs, I suspect they will tell you to use their GUI to unlock the device. )

If you really want to try (and this is speculation, since I usually just use their GUI)

... you could try creating a Pre-Download Script

... and include it under Options for Target — Utilities — Init File

... you would have to uncheck Program in the Flash Download Setup dialog and press OK.

... in that script file you could use the "Load" debug command,

... finally, you could try the _WDWORD to set the AAP registers.

To get an idea of what such a script would look like, it would probably be the opposite of this one, where you do the load command first, then use the _WDWORD commands to write values to registers.

Good luck. Let us know what solution ultimately worked for you.

Thanks for your answer. I order jlink v9 ARM tool for unlocking, erasing and loading bin & hex file into EFM32, because software jlink can do it in 1 click.

Silicon labs GUI = simplicity studio, don't support Ulink2, but support Jlink v9 Arm tool..