Modulating uart output

[billywalton]

Hi

I would like to modulate the positive output of the UART using PWM

I know i can feed the UART and a PWM putput into a AND gate no problem, but im wondering if there is a wway to use PPI or something internally to do the same, for example if i can link the state of the uart TX ouput pin to the PWM enable?

Many thanks

Billy

[FormerMember]

Yes, it should be possible to make f.ex the TX UART sent event (EVENTS_TXDRDY) trigger a PWM task using PPI.

I would recommend you to take a look at the PPI example in the SDK to get at starting point. 

[billywalton]

Hi

It looks to me that this event is geared towards the entire byte transmission, not the individual bits of the bytes.  I am looking for an event that fires after the transmission of every bit in the byte

I think this is not possible?

[FormerMember]

If you want an event for every bit, I would think a "hack" is needed: Split the outgoing UART signal so that one line go to a GPIO. GIPOTE can then be used to trigger on rising edge/falling edge or both. That may be a little closer to what you want to do. Perhaps it is possible to combine it with some logic as well, if needed.