S32KのトピックRe: UART

UART

AhmedRiad — Wed, 21 Jun 2023 16:49:59 GMT

Hello NXP ,
I'm using EVK S32K118-64
For LPUART0
Tx is working fine (Tested the Pin itself on the board for example PTB1 and read the Tx frame sent from the EVK using oscilloscope )
but Rx pins doesn't detect UART frames .

my question here is related to the EVK schematic for LPUART0, is LPUART0 RX pins are connected to Open-SDA debug interface by default and I can't use the LPUART0 pins on the S32K118 (PTB0 ,PTC2,PTA2)?

is there a jumper I need to remove , to be able to use Rx LPUART0 pins (PTB0 ,PTC2,PTA2)?

Thanks in advance.

Re: UART

PetrS — Thu, 22 Jun 2023 08:30:00 GMT

Hi,

yes, PTB0 is directly connected to OpenSDA UART interface via R24&R666 zero ohms resistors.
If you want to use LPUART RX function on different pins do not configure PTB0 for LPUART RX but rather config different pin, either PTC2 or PTA2.

BR, Petr

Re: UART

AhmedRiad — Thu, 22 Jun 2023 12:04:56 GMT

Hi ,
Thanks for your reply , if I used openSDA JTAG (Connected a debugger) instead of using OPenSDA USB with Design stuido ,will I be able to use PTB0 ?

Re: UART

PetrS — Thu, 22 Jun 2023 13:27:32 GMT

Hi,

as the OpenSDA MCU drives through level shifter this PTB0 pin, then you cannot connect another output signal to it, or configure PTB0 as output, unless you remove R24 or R666.

BR, Petr

Re: UART

AhmedRiad — Sun, 25 Jun 2023 11:50:32 GMT

Hello PetrS,
Thanks for your reply, I have now LPUART0-Tx (PTB1) Pin connected with LPUART0-RX (PTC2) Pin. (HW connection)
I was trying to test UART RX pin by sending TX uart frames from PTB1
using EB Tresos plugins for uart I use the following :
Uart_SyncSend to send UART frames (API returns E_OK ) (Actual uart messages are sent on PTB1)
Uart_SyncReceive to receive UART frames after calling Uart_SyncSend ( API always timeout , and returns E_NOT_OK )

Re: UART

PetrS — Mon, 26 Jun 2023 11:26:28 GMT

Hi,

I do not know this HLD driver much but try first call Uart_AsyncReceive and then Uart_SyncSend.

BR, Petr

Re: UART

AhmedRiad — Mon, 26 Jun 2023 11:34:52 GMT

hi PetrS ,
Issue solved ,thank you

Re: UART

sbusc — Thu, 25 Apr 2024 18:29:34 GMT

Hi Ahmed what is the finally solution ? Thank you in advance