Uart Stop bit access in K22F

[prasannanaik]

Hi,

   I am using FRDM K22f baord for evaluation of K22 microcontroller series. I am trying to verify UART functionality using "lpuart_interrupt Example " driver example project but i am not able to configure the stop bit.

The stop bit declaration has been prevented with "FSL_FEATURE_UART_HAS_STOP_BIT_CONFIG_SUPPORT" macro.

I have tried enabling the macro through MCU setting in properties of project but still i am getting error while using stop bit varaiable in config structure of UART.

Please help in resolving the issue.

Thanks and best regards,

Prasanna

[FelipeGarcia]

Hi Prasanna,

In K22 MCU LPUART has programmable 1-bit or 2-bit stop bits. On the other hand UART module doesn’t have this feature. That is why the FSL_FEATURE_UART_HAS_STOP_BIT_CONFIG_SUPPORT macro is '0' and FSL_FEATURE_LPUART_HAS_STOP_BIT_CONFIG_SUPPORT is '1'.

However, as you are using lpuart_interrupt example you don’t need to change the corresponding macro. In LPUART_GetDefaultConfig() function stop bit is configure to kLPUART_OneStopBit, please take a look to the snippet below.

I hope it helps!

Best regards,

Felipe

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