UART communication

[BhSa_4078721]

Hi,

I am using cy8c4025 axi-412

And trying to send out UART data on capsense button press..

On single touch only one time data should send on UART. Bt practically it sends data 3 to 4 times on single touch.

How can I limit this data to send for only one time.

[VenkataD_41 · Accepted solution]

Hi,

Please note that you have to limit sending multiple times through UART in firmware.

Please find the attached document with two assignments and attached projects. Please check Assignment_1 which is similar to the case you mentioned.

Thanks and regards

Ganesh

[Len_CONSULTRON]

BhSa,

You need to create your own capsense 'switch' debouncing in your SW application.

Len

[Hari]

Hi LePo_1062026​, BhSa_4078721​

It is not "switch debounce". In this case, UART sends the data multiple times as CapSense is active for a long duration (multiple scan cycles) even when it is pressed for a short instance.

The solution recommended in post#1 is the way to go. CapSense does not suffer from debounce like mechanical buttons since the firmware takes care of this. There are parameters such as Hysteresis and debouce that are set in the component that make sure that debounce does not occur.

Thanks,
Hari

[Len_CONSULTRON]

Hari,

The Capsense detect is a 'virtual' switch.  BhSa's complaint:

On single touch only one time data should send on UART. Bt practically it sends data 3 to 4 times on single touch.

How can I limit this data to send for only one time.

If the Application first sees the the CapSense 'switch' press the first time, it should send the output through the UART ... once.  As long as the Capsense on the 'switch' is still active, no more data is sent through the UART.   Once the Capsense 'switch press' is no longer active, then the internal variable is cleared to allow further 'switch presses'.

Len