UART DMA (time gap between bytes)

jjjopaul — Wed, 05 May 2021 04:42:37 GMT

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.?

Re: UART DMA (time gap between bytes)

lukaszadrapa — Wed, 05 May 2021 11:29:56 GMT

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

topic UART DMA (time gap between bytes) in S32K

UART DMA (time gap between bytes)

Re: UART DMA (time gap between bytes)