topic Re: S32k14x UART flow control in S32K

S32k14x UART flow control

chandan_uv — Mon, 07 Aug 2023 10:03:14 GMT

Hello, I am using S32K146 and want to implement UART with flow control (RTS and CTS). I understand that I have to configure these 2 pin for same with UART pin based on pinout MUX sheet. I want to understand does the control for these pin auto taken care by hardware based on usual function call like LPUART_DRV_ReceiveData() and LPUART_DRV_SendData() or anything extra needs to be done in application software.

Thanks

Re: S32k14x UART flow control

VaneB — Mon, 07 Aug 2023 20:49:11 GMT

Hi @chandan_uv

Unfortunately, the LPUART SDK driver does not support hardware flow control. But at S32K Knowledge Base, you can find an example to run on the S32K144EVB board with RTM 3.0.0.

S32K LPUART hardware flow control

Also, refer to sections 53.4.3.2 and 53.4.4.3 of the S32K1xx Series Reference Manual.

B.R.

VaneB

Re: S32k14x UART flow control

chandan_uv — Tue, 08 Aug 2023 10:07:16 GMT

@VaneB I already checked that example. In same, standard SDK function are not used, direct registers are used in setLpuartHardFlowCtrl().

Also can you answer this " I understand that I have to configure these 2 pin for same with UART pin based on pinout MUX sheet. I want to understand does the control for these pin auto taken care by hardware based on usual function call like LPUART_DRV_ReceiveData() and LPUART_DRV_SendData() or anything extra needs to be done in application software"

Re: S32k14x UART flow control

VaneB — Wed, 09 Aug 2023 21:13:20 GMT

Hi @chandan_uv

As I mentioned before, the SDK does not support hardware flow control.

Re: S32k14x UART flow control

chandan_uv — Tue, 12 Dec 2023 11:03:37 GMT

@VaneB In that example, CTS<-> RTS andCTS<-> RTS but generally they are , CTS<-> CTS and RTS<-> RTS connected. In that case, what should be changed in the code?