stm32f217 now unresponsive...

[martingingras9]

Posted on September 22, 2014 at 17:44

Hi,

I was working with Keil+ulinkpro on a custom board using an stm32f217 and everything was fine.  I start working on some automated script for inital setup for our product using openocd.  Somehow, it rendered the chip unresponsive.  I am now unable to write/read with openocd and with keil/ulinkpro.  I can see the SW device in the keil debugging tab.... I was wondering if there is a way to reset the MCU to it's initial state?Regards,Mart

[Tesla DeLorean]

Posted on September 22, 2014 at 17:50

You can reset it with BOOT0 High, and then erase it. Still things like OTP, and protection options can be irreversible.

[megahercas6]

Posted on September 22, 2014 at 18:20

where is two ways to make mcu unresponsive.

1) incorrect PLL settings, so if you have 25MHz clk, and you state that HSE is 8MHz, it will lock up ( just had this problem, shorted clk, and reprogrammed) 2) you programmed SWD pins as GPIO,  (PA13-PA14), in that case you must connect under reset, and leave GPIOA 13-14 pins alone

[Tesla DeLorean]

Posted on September 22, 2014 at 18:55

Turning the power off will also break the interface. WFI and DMA can also cause problems.

[martingingras9]

Posted on September 22, 2014 at 19:29

how do I erase? Using the ulinkpro doesnt seems to work so far...

[Tesla DeLorean]

Posted on September 22, 2014 at 19:43

In Keil uv4 :  Flash -> Erase (with a projected loaded will perform Full Chip Erase)

The BOOT0 High trick will get the chip into System Loader mode, which is a safe harbour if user code is running errant. There's things like ST-LINK Utilities for the ST-LINK pods, the ULINKPro doesn't have any stand-alone tools

[martingingras9]

Posted on September 22, 2014 at 20:12

That is exactly what I did for the erase.  it took like one second and output ''Full Chip Erase Done''.. yeah right...   I am still unable to program....  very strange... 

[Tesla DeLorean]

Posted on September 22, 2014 at 21:05

Yeah, not much to work with there. Any messages or anything?

Program something simple. Use Flash -> Download, and make sure you have suitable ''Load Application'', ''Update Target'', ''Download to Flash'', ''Verify Code Download'' options.

[chen]

Posted on September 23, 2014 at 10:19

Hi

As clive1 said - not much to go on there. ''I was working with Keil+ulinkpro on a custom board using an stm32f217'' Have any of the JTAG/SWD pins been used for anything (IO or other alternate function)? Has the BOOT0 pin been used for anything ?

[martingingras9]

Posted on September 24, 2014 at 21:30

well I switched back to my STM3221G-EVAL board.  Knowing that I have a proper tool (ST-LINK and ST-LINK utility) to save my ass. After numerous run of the code, the keil IDE was unable to erase and flash again.  I fired up the ST-LINK utility and discovered that the Readout Protection was now set to 1.  All I am doing is:

HAL_FLASH_Unlock();HAL_FLASHEx_Erase();HAL_FLASH_Program()HAL_FLASH_Lock();I started to play with the Write protection of the flash today but I do believe this is completely separate from the ReadOut Protection stuff...Mart