Send command 0x7F with Teraterm while in bootloader mode

[Domy_ST]

hello ST Community,

I'm trying to send commands as indicated in the AN3155 manual via UART with Teraterm on the NUCLEO-H755ZI-Q for CM7.

system bootloader application note (AN3155) 

First, I tried establishing UART communication with the STM32CubeProgrammer, and it worked while Boot0 = 1 on the USART3 pins.

But I'd like to establish the same communication via UART using Teraterm serial. As soon as I set the bootloader state to Boot0 = 1, I send the command 0x7F, and I get no response on the terminal. What did I do wrong?

Thanks for supports

[mƎALLEm]

Hello,

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@Domy_ST wrote:

I send the command 0x7F, and I get no response on the terminal. What did I do wrong?

Thanks for supports

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How did you test that?

Probe USART3_Rx with an oscilloscope and check if you have the intended 0x7F received on that pin and what it was returned back on USART3_Tx..

[Domy_ST]

hello @mƎALLEm ,

On the oscilloscope, I can see 0x7F for USART3_RX and various response values ​​for USART3_TX with STM32CubeProgrammer.

On the other hand, with Teraterm, I can see values ​​on both USART3_RX and USART3_TX, but not the values ​​I expect. I suspect the send and receive encoding on Teraterm is set incorrectly. Is there any serial software that correctly encodes the send and receive in HEX?

Thanks

[mƎALLEm · Accepted solution]

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@Domy_ST wrote:

hello @mƎALLEm ,

I suspect the send and receive encoding on Teraterm is set incorrectly.

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That's indeed what I have a doubt in.. I'm not using TeraTerm.

Try Hercule. I didn't test that feature but you can have a try:

To send with HEX format:

[Andrew Neil]

I've never been successful in getting TeraTerm to do raw binary/hex.

RealTerm does it: https://sourceforge.net/projects/realterm/

I'm sure there are plenty of others ...

Or just write a PC app in your favourite host language - C, C++, C#, Python, whatever ...

[Domy_ST]

@mƎALLEm @Andrew Neil 

Ok, I'll try both. That's what I plan to do: implement an application to manage the bootloader via UART, but first I'd like to test the communication from a terminal.

Thanks

[Domy_ST]

It works with Hercules, but I can't get RealTerm to work. Thanks to both of you for your helpful support.

[mƎALLEm]

Ok.

So please accept the post that has answered your question then..

[Domy_ST]

just accepted