UART parity problem in frdmk64

[sudhakarp]

Hi,

i am using FRDMk64f120, kds 3.0 and KSDk 1.2.0 example.i tried UART non blocking example project. its working fine with none parity but if i change to ODD or EVEN parity its not working why..?

i changed following method:

uart_user_config_t uartConfig = {

        .bitCountPerChar = kUart8BitsPerChar,

        .parityMode           = kUartParityOdd,                    //kUartParityDisabled, //this one commented and changed

        .stopBitCount         = kUartOneStopBit,

        .baudRate             = BOARD_DEBUG_UART_BAUD

};

other remaining code same. in example code only i changed "kUartParityDisabled -to-kUartParityOdd".

why this problem coming? is any thing i want to add or change?

regards,

sudhakar p

[isaacavila]

Hello Sudhakar,

UART Driver used in example uses the 8-bit mode and according to k64's Reference Manual, parity bit is saved in UART_D register:

Example uses UART_HAL_Putchar function that does not consider parity bit, so, you will need to modify this example in order to consider parity bit. You can look at fsl_uart_hal.c file and there are sending and receiving functions that use either 8th-bit and 9th-bit.

So you can modify this example or create a new one that uses these 9th-bit functions in order to add parity support. Please refer to fsl_uart.h and fsl_uart.c files.

• static inline void UART_HAL_SetBitCountPerChar(UART_Type * base,

                                          uart_bit_count_per_char_t bitCountPerChar)

• void UART_HAL_Putchar9(UART_Type * base, uint16_t data)

I hope this can help you

Best Regards,

Isaac

----------------------------------------------------------------------------------------------------------------------------------------

Note: If this post answers your question, please click the Correct Answer button. Thank you!

----------------------------------------------------------------------------------------------------------------------------------------

[sudhakarp]

hi,

     thanks for your information. i tried Even parity, 8-bit and 2-stop bit. but am getting junk value. some character not display correctly. i tried following method,

UART_HAL_SetParityMode ( UART1_BASE,kUartParityEven);

UART_HAL_SetStopBitCount(UART1_BASE, kUartTwoStopBit);

UART_HAL_SetBitCountPerChar (UART1_BASE,kUart8BitsPerChar);

i am using UART1_RX_TX_IRQHandler(). for receiving character.  can you give simple example then i can easily understand. give some idea i tried but i am not get output.

regards,

sudhakar

[isaacavila]

Hi Sudhakar,

Please, see this post: Re: how to set EVEN-7BIT-1 STOP BIT SETTING FOR FRDMK64 , here you can find detailed information in order to configure your UART module correctly.

Best Regards,

Isaac