programming a STM32F429IG

[fabricepeden]

Posted on March 21, 2017 at 14:51

Hi erverybody,

I'm programming two cards. The first has a STM32F205RG, this one functions perfectly, I can program it and do what I want (I'm using SWD connection to program my cards).

The second one has a STM32F429IG. For this one, I cannot program it. I have tried with J-LINK, ST LINK (by using IAR or ST LINK utility). The connection diagram is exactly the same as for the first board, and I have also checked all connections between connector and �C.

In enclosed documents, my main connections (PDR_ON and BYPASS_REG are not connected, I have also tried to connect them to VDD but it's the same).

If you have any suggestions (diagram, option in IAR/ST LINK), I'll be very happy.

Thank you

Regards,

Fabrice P�den

#stm32f429 #swd

[Tesla DeLorean]

Posted on March 21, 2017 at 15:21

Check the voltage on the VCAP pins

Check the level on NRST

If the external pod needs VTref to drive its buffers make sure that is powered.

Secondary signs-of-life would be access to the System Loader, pulling BOOT0 high, and trying USB or USART1/USART3 connectivity, per the loader documentation. On the serial port sending an 0x7F byte at 9600 8E1, expecting an 0x79 response.

An unpowered core will not be responsive.

[fabricepeden]

Posted on March 21, 2017 at 15:39

Thank you for your quick answer.

Concerning VCAP pins, the voltage is 1.137V (same voltages on both pins). Moreover, the STM32 datasheet specify 2.2µF and ESR < 2 Ohms, if the ESR is more important than 2 Ohms, can it give this kind of problem ?

NRST is @ 3V3, and goes down to 0V when I plug the JLINK.

what do you mean about external pod ?

I'll try to access to the system loader, I'll let you inform.

Thank you,

Fabrice

[fabricepeden]

Posted on March 21, 2017 at 16:09

I've checked with BOOT0 @ 3V3.

I sent frames with docklight and use STM Flash Loader demonstrator, and no answer from my µC.

So, that means that the core is not powered ? But I have checked all my supplies, and they are good.

[Tesla DeLorean]

Posted on March 21, 2017 at 16:03

>>what do you mean about external pod ?

Free standing ST-LINK, J-LINK, etc

[fabricepeden]

Posted on March 21, 2017 at 17:52

I found the solution. BYPASS_REG must be tied to VSS to be enabled.