stm32f4discovery can write/read flash but not work

[silent]

Posted on April 04, 2014 at 17:40

After days spent in tries to connect adc via i2s - mcu stopped working. I can write and read flash via st-link, mcu is properly detected but it does nothing. Tried mass erase - did not helped.

It seems that works only bootloader.

Is it definitely dead? )

[chen]

Posted on April 04, 2014 at 17:46

Hi

Is this a board of your own design or a Eval board?

Are there any LEDs that can be flashed?

Try a simple LED flasher program.

If you are the same poster talking to fm - you do not have an ocilloscope - is that right?

Are you using external crystal - is it still working (sorry you need a scope to check that).

[Tesla DeLorean]

Posted on April 04, 2014 at 17:56

Is this a board of your own design or a Eval board?

STM32F4-Discovery

[silent]

Posted on April 04, 2014 at 17:59

This is a board http://www.st.com/web/catalog/tools/FM116/SC959/SS1532/PF252419, tried simple blink flash - not blinking, all voltages are ok

>If you are the same poster talking to fm - you do not have an ocilloscope - is that right? 

yep, i'm a poor autodidact developer )

[chen]

Posted on April 04, 2014 at 18:11

Hi

OK, that board does not have LED.

Any chance of adding LED with resistor to one IO port and doing a simple LED flasher

program?

A quick way around toggling too fast, toggle on a key press (this board does have 1 user key)

It is a simple way to get indication of life from the processor.

[silent]

Posted on April 04, 2014 at 18:13

this board HAVE 4 LEDS

as i said i alredy tried led blinking program

[Tesla DeLorean]

Posted on April 04, 2014 at 18:21

Try this .HEX file with ST-LINK Utilities, make sure that BOOT0 is not pulled High, as this will only ever run the boot/system loader.

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:00000001FF

[chen]

Posted on April 04, 2014 at 18:39

Hi

Sorry missed that.

The only other thing I can think of requires a scope.

Program the IO pin to output the clock.

I am thinking maybe the oscillator has broken.

So the board will program but without the oscillator working - no program will work.

I just looked at the board here in the office. It has external Osc crystal.

Does the device have built in RC oscillator ? - maybe you can program it to use that

[silent]

Posted on April 04, 2014 at 18:42

nothing, HEX has been successfully writed but no reaction

[Tesla DeLorean]

Posted on April 04, 2014 at 18:58

Not promising, sounds like you've nuked the thing.