STM32F407 JTAG and Flash Loader Demonstrator Unsuccessful

[nagano]

Posted on June 01, 2015 at 03:55

I have serious problem.

I tried to write software to the devices with JTAG and Flash Loader Demonstrator,but both of them could not find device.I guess the device revision has something different with revision ''Z''.Revision ''Z'' devices are successful with JTAG and Flash Loader Demonstrator,however ''L'' are unsuccessful at all.If anyone know about this problem, please tell me tips.Following infomation was tried to write with JTAG and Flash Loader Demonstrator.--- Unsuccessful Device BGA Package---ARM LSTM32F407IEH6HPADX VQKOR HP 504--- Successful Device 1. BGA Package---ARM ZSTM32F407IEH6HPAFW VGKOR HP 322--- Successful Device 2. QFP Package---ST ZSTM32F407ZGT6ARM HPABUVGKORHP4L7

[Tesla DeLorean]

Posted on June 01, 2015 at 05:28

No particular insight.

Usual things to confirm : Voltages on VCAP pins State of NRST pin State of BOOTx pins

[nagano]

Posted on June 01, 2015 at 05:34

Thank you, clive1

I rework device revision L to Z then the MPU connect with JTAG and Serial.(On some of same PCB bords.)So I worder why doesn't work this device.Everything same as revision L.

[nagano]

Posted on June 01, 2015 at 06:06

Hi, clive1

 >Voltages on VCAP pinsShould I connect BYPASS_REG pin to Low?Now, this pin is open.

[nagano]

Posted on June 08, 2015 at 09:16

As the result, VCAP Pins Voltage is a Key!

Bypass_REG pin connect to the GND throuh 10k ohm, thenVoltage on VCAP is about 2.6V and confirm to write firmware.Now, Everything is OK.Thank you a lot.

[Tesla DeLorean]

Posted on June 08, 2015 at 15:25

Shouldn't the VCAP pins be at 1.25V?! How have you got these parts wired up? (schematic)

[nagano]

Posted on June 09, 2015 at 03:43

Hello Clive

>Shouldn't the VCAP pins be at 1.25V?! How have you got these parts wired up? >(schematic)It was 1.25V. I made typo.Thanks.