i.MX RT Crossover MCUsのトピックLPUART Free elements in TX fifo API call.

LPUART Free elements in TX fifo API call.

e_v_spronsen — Thu, 04 Jun 2020 14:15:27 GMT

I'm looking in the documentation for a function that returns the free elements in the LPUART TX fifo.

So I know how many data element to write in the interrupt function.

Can you please tell me where I can find it.

Thanks!

Re: LPUART Free elements in TX fifo API call.

victorjimenez — Mon, 08 Jun 2020 18:51:39 GMT

Hello,

Unfortunately, there isn't any API that gives you this information. This is because within the FIFO register of the LPUART, there isn't any information that tells you either how many elements the FIFO exactly has or how many empty spaces are.

Have a great day,

Victor

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Re: LPUART Free elements in TX fifo API call.

e_v_spronsen — Tue, 09 Jun 2020 06:03:31 GMT

Don't use my my full name on the Internet! Who want to end in a search about the element used in a TX register!!

So the only way to empty the TX register is a while not empty loop? That is not really sophisticated.

Re: LPUART Free elements in TX fifo API call.

victorjimenez — Fri, 12 Jun 2020 02:11:16 GMT

Hello,

Yes, if you want to know exactly how many free spaces you have on the TX FIFO you will have to implement something like a while not empty loop.

Regards,

Victor