topic how do disable carriage return character in UART-0 (FRDMK64) in MQX Software Solutions

how do disable carriage return character in UART-0 (FRDMK64)

sudhakarp — Fri, 13 Nov 2015 13:25:19 GMT

HI,

I am using FRDMK64f120 controller, KDS2.0 and KSDK 1.1.0 example . when i transfer "0x0A" character through uart its adding automatically "0x0D" carriage return character. i dnt want carriage return character so how to remove that one.

regards,

sudhakar p

Re: how do disable carriage return character in UART-0 (FRDMK64)

DavidS — Fri, 13 Nov 2015 20:46:23 GMT

Hi Sudhakar,

I'm using KSDK_1.3 but should be same for you.

Look in ~C:\Freescale\KSDK_1.3.0\test_frdm-k64f_ksdk_mqx_pe_fp\SDK\rtos\mqx\mqx\source\bsp\init_bsp.c

In the _bsp_nio_stdio_install() function the stdin/stdout/stderr get setup. You can remove the NIO_TTY_FLAGS_EOL_RN flag.

close(1);

fd = open("tty:", NIO_TTY_FLAGS_EOL_RN | NIO_TTY_FLAGS_ECHO); // 1 - stdout

assert(fd == 1);

Regards,

David

Re: how do disable carriage return character in UART-0 (FRDMK64)

sudhakarp — Sat, 14 Nov 2015 05:16:12 GMT

hi,

still i am having problem. i did my code following way, and also i am using fwrite(data, 1, 1, ser_device); function to out character through uart.

ser_device = fopen(SERIAL_DEVICE, "w");

fwrite(data, 1, 1, ser_device); function to out character through uart.

fclose(ser_device);

/* Install and open dummy drivers for stdin, stdou and stderr. */

res = _nio_dev_install("dummy:",&nio_dummy_dev_fn, (NULL));

assert(NULL != res);

fd = open("dummy:", 0); // 0 - stdin

assert(fd == 0);

fd = open("dummy:", 0); // 1 - stdout

assert(fd == 1);

fd = open("dummy:", 0); // 2 - stderr

assert(fd == 2);

/* Instal and set tty driver */

res = _nio_dev_install("tty:", &nio_tty_dev_fn, (void*)&(NIO_TTY_INIT_DATA_STRUCT){BSP_DEFAULT_IO_CHANNEL, 0});

assert(NULL != res);

close(0);

fd = open("tty:",NIO_TTY_FLAGS_ECHO); // 0 - stdin

assert(fd == 0);

close(1);

fd = open("tty:",NIO_TTY_FLAGS_ECHO); // 1 - stdout

assert(fd == 1);

close(2);

fd = open("tty:",NIO_TTY_FLAGS_ECHO); // 2 - stderr

assert(fd == 2);

AND ALSO I TRIED:

close(0);

fd = open("tty:",0); // 0 - stdin

assert(fd == 0);

close(1);

fd = open("tty:",0); // 1 - stdout

assert(fd == 1);

close(2);

fd = open("tty:",0); // 2 - stderr

assert(fd == 2);

but still its outing carriage return character. this implementation i am doing in ethernet_to_serial example. give some idea.

regards,

sudhakar p

Re: how do disable carriage return character in UART-0 (FRDMK64)

sudhakarp — Mon, 16 Nov 2015 03:57:25 GMT

Hi David,

give some idea to solve this problem.

regards,

sudhakar p

Re: how do disable carriage return character in UART-0 (FRDMK64)

sudhakarp — Mon, 16 Nov 2015 05:10:35 GMT

Hi david,

finally i commented following c coding in "nio_tty.c" file. now my problem solved

function: nio_tty_write

if ((fpc->flags & NIO_TTY_FLAGS_EOL_RN) && (*s == '\n'))

{

ret = _nio_write(devc->fd, "\r", 1);

if (-1 == ret)

{

//TODO: errno should not be used in the low level driver. This is workaround for layering devices. _nio_write should not set errno, rather write should do it.

return -errno;

}

if (0 == ret)

{

break;

}

Thank you DAVID.

regards,

sudhakar p