STPM32 ''Read buffer length insufficient. The operation has timed out.''

[Jobin Jacob Kavalam]

Posted on March 23, 2017 at 12:31

I tried to connect the EVAL-STPM32 board to the STPM3x Evaluation Software but encountered the following error when trying to read data.

Error message: 'Read buffer length insufficient. The operation has timed out.'

PC was running Windows 7 STPM3x Evaluation Software v3.1.0.0

In the 'Options -> Interface' menu, the following values were used:

UART / COM 5 / 9600 (baud rate)

The board was connected to the PC through a USB to UART Bridge (Silicon Labs CP210x).

J2 connected to the USB-to-UART bridge

J7 connected to an external DC supply of 3.3V

J2 connected to a different 3.3V source

J3 jumper was removed

SWC1 DIP switch was all in on position

J4 jumper was in 'enable' position

I really appreciate your help.

#stpm3x

[Jobin Jacob Kavalam]

Posted on March 23, 2017 at 13:28

Should some signalling be done on the SCS pin during chip startup to enable the UART interface. Could this be related to the problem am facing ?

Thanks in advance for the comments.

[said ediz]

Posted on January 12, 2018 at 15:29

Hey i have also faced same problem. Could you make any progress about it?

[aaltonen1024]

Hi, did you manage to solve it? I have the same issue 

[Kyle SUNG]

: solved one of similar issues, 10 k pull-up at UM2092.