MQX Software SolutionsのトピックUART parity problem in frdmk64

UART parity problem in frdmk64

sudhakarp — Thu, 10 Sep 2015 06:43:09 GMT

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

Re: UART parity problem in frdmk64

isaacavila — Sun, 13 Sep 2015 20:21:53 GMT

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

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Re: UART parity problem in frdmk64

sudhakarp — Mon, 14 Sep 2015 04:08:01 GMT

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

Re: UART parity problem in frdmk64

isaacavila — Thu, 24 Sep 2015 16:45:12 GMT

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