UART DMA (time gap between bytes)

[jjjopaul]

Controller used : S32K344

I want to send (transmit) data via UART (DMA method) and also ensure that there is a time gap between each byte that is placed in the DATA register. I want to configure the whole data block in DMA initially and let DMA place each byte after a time interval. 

Is there a way to ensure that there is a time gap between each byte that DMA places in the DATA register.? 

[lukaszadrapa]

Hi,

yes, DMA supports periodic triggering by PIT.

Notice that the configuration above is hardwired. Only DMA channels 0-3 can be used for this feature and corresponding PIT channel needs to be configured. So, if you want to trigger DMA channel 0, only PIT 0 can be used.

Take a look at "17.4.1 DMA channels with periodic triggering capability" for more details. The feature can be enabled by TRIG bit in DMAMUX channel configuration register.

Regards,

Lukas