Getting -16 when trying to connect to a Boot Loader device

[MSSloan1962]

Where can I find the meaning of the returns from connectDfuBootloader? I'm getting -16 back and would like to know what it means.

 

[Amel NASRI]

Hi,

Where exactly can you find the mentioned command or function? It is likely not an ST-delivered tool or firmware.

Generally, to understand how the DFU bootloader works, refer to the application note AN3156 USB DFU protocol used in the STM32 bootloader.

-Amel

[MSSloan1962]

We're using the connectDfuBootloader entry point into CubeProgrammer_API.dll. A successful connection returns 0. What possible errors are returned and what do they mean? I've seen -5 and -16 so far

[Amel NASRI]

I move your question to STM32CubeProgrammer dedicated forum and I let our expert @Aziz BRIGUI review your request there.

[Pavel A.]

Check enum cubeProgrammerError in CubeProgrammer_API.h.

CUBEPROGRAMMER_ERROR_RDP_ENABLED = -16

[MSSloan1962]

I assume RDP means Remote Desktop Protocol. Is there any means for disabling it programmatically with C#? How would it get enabled? I'm pretty sure I'm not enabling it with my program

[MSSloan1962]

I tried "–ob rdp=0x0" but got a -1 result, meaning Not Connected. So I'm in a situation where I can't connect because I'm getting -16 (RDP enabled) and I can't disable RDP because I'm not connected

[Aziz BRIGUI]

Hello @MSSloan1962,

You can disable RDP 1 by a debug connection (ST-Link or JLink) or by the read unprotect command via bootloader interfaces :

Could you detail the case where RDP was set to 1 ? Can you reproduce it with your API project, if yes please share your code and detailed steps to reproduce.

Aziz

 

[MSSloan1962]

I've now found that RDP stands for Readout Protection