BREAK signal transmission on EZ-USB FX3 USB-UART bridge

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Taguchi
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Hi,

I am testing UART communication operation with the sample USB-UART bridge (cyfxusbuart) that comes with the EZ-USB FX3 SDK 1.3.4.

Using Tera Term on a Windows PC, I was able to send and receive ASCII code without any problems.

However, the BREAK signal cannot be transmitted.

Similarly, using Tera Term, the BREAK signal can be transmitted with the FTDI FT4232H.

Therefore, I think that the setting of TeraTerm is not a problem.

Could you please teach me how to send a BREAK signal over the FX3's USB-UART bridge?

 

Best Regards,

Taguchi

 

 

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1 Solution
AliAsgar
Moderator
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1000 replies posted 250 solutions authored 750 replies posted

Hi Taguchi,

BREAK command comes with a bmRequestType 21h and bRequest 23h. Kindly handle the parsing of break character to the UART lines in the usbuart firmware in the FX3 SDK.

Best Regards,
AliAsgar

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4 Replies
AliAsgar
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1000 replies posted 250 solutions authored 750 replies posted

Hi Taguchi,

Could you please confirm what characters were seen on the FX3 UART Rx lines while issuing the BREAK signal?

Best Regards,
AliAsgar

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Taguchi
Level 1
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Hi, AliAsgar

Thank you for your comment.

When I try to send a BREAK signal, the FX3's TX line stays at HIGH level and does not drop to LOW level.

RX also remains at HIGH level.

 

Best Regards,

Taguchi

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AliAsgar
Moderator
Moderator
Moderator
1000 replies posted 250 solutions authored 750 replies posted

Hi Taguchi,

BREAK command comes with a bmRequestType 21h and bRequest 23h. Kindly handle the parsing of break character to the UART lines in the usbuart firmware in the FX3 SDK.

Best Regards,
AliAsgar

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Taguchi
Level 1
Level 1
5 sign-ins First reply posted First question asked

Hi, AliAsgar

Thank you for your comment.
I checked the USBUART firmware code.
As the BREAK code processing was not written, I will try to add it.

Best Regards,
Taguchi

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