Stm32f429

[harry123]

Hi all

I'm want to send a string from one stm32 to another stm32 to blink an led on it I'm using uart polling method to do that.

The communication happens and led blinks only if I press the Reset button once I switch off and on power supply. What should be done if I want continuous communication. 

[Andrew Neil]

So there must be something wrong with the reset arrangements in your hardware

[harry123]

I have shorted SB1 and R24 in the Reset section and SB21 is shorted to ground and left R59 open on the F429 controller side.

[Andrew Neil]

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@harry123 wrote:

I have shorted SB1 and R24 

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You've shorted R24?

You mean NRST is connected direct to VDD??! :flushed_face:

EDIT

You said it's a custom board, but that looks very much like an ST devboard schematic? :thinking_face:

[harry123]

Made custom board same as stm32f4 disc1. Sorry, I was confused  R24 is connected to 100K but it shows not fit in the schematic.