Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

RE: Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

Frodesto — Thu, 25 Jun 2015 10:13:53 GMT

I'm just getting started with nRF development and hit the same problem -- Printf only printed the first character of the string.

I found the solution in another thread: Switch to the FIFO variant of the app_uart driver (use Project->Manage->Runtime Environment in Keil. Remeber to add the app_fifo library as well).

RE: Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

Nguyen Hoan Hoang — Sat, 30 May 2015 06:50:36 GMT

How is the uart pins connected ? are there connections on CTS/RTS ? if not desirable Flow control.

RE: Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

eq — Sat, 30 May 2015 03:02:50 GMT

printf, app_uart, _write all spit out one character and one only

RE: Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

Nguyen Hoan Hoang — Sat, 30 May 2015 02:28:22 GMT

Does it happen only with printf ? If you use the app_uart function directly does it work ? Just need to isolate the problem. If only printf is the problem try set printf buffering with

setvbuf (stdout , NULL , _IOLBF , 256 );

RE: Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

eq — Sat, 30 May 2015 02:19:56 GMT

Same result. "H" only

RE: Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

Nguyen Hoan Hoang — Sat, 30 May 2015 02:01:15 GMT

try printf("Hello\n"); with the \n at the end.

RE: Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

eq — Fri, 29 May 2015 21:30:03 GMT

Still no luck. Using the init routine below, included retarget.c in the build, and using Printf, still only spits out the first character of the string.

void init_uart(void)
{
    uint32_t err_code;
    const app_uart_comm_params_t comm_params =
    {
          RX_PIN_NUMBER,
          TX_PIN_NUMBER,
          RTS_PIN_NUMBER,
          CTS_PIN_NUMBER,
          APP_UART_FLOW_CONTROL_ENABLED,
          false,
          UART_BAUDRATE_BAUDRATE_Baud38400
    };

    APP_UART_FIFO_INIT(&comm_params,
                         UART_RX_BUF_SIZE,
                         UART_TX_BUF_SIZE,
                         uart_error_handle,
                         APP_IRQ_PRIORITY_LOW,
                         err_code);

    APP_ERROR_CHECK(err_code);
}

BTW, it looks like I am not the only person facing this issue:

devzone.nordicsemi.com/.../

These are BOTH unresolved questions as well :-(

RE: Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

Susheel Nuguru — Fri, 29 May 2015 09:53:19 GMT

using S110 softdevice will not block UART forever. Why did you disable flow control?

APP_UART_FLOW_CONTROL_DISABLED, //APP_UART_FLOW_CONTROL_ENABLED,

Segger COM port emulation needs flow control to be enabled. Disabling flow control is for external device/sensors that are connected directly to nRF51 UART pins and if those devices does not have flow control. Enable flow control and follow intructions mentioned by Hoan Hoang about retarget.c. Printf should function normally then.

RE: Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

eq — Fri, 29 May 2015 07:23:08 GMT

yeah this is not working for me. I suspect it has something to do with me using the S110 Soft Device

RE: Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

Nguyen Hoan Hoang — Fri, 29 May 2015 07:11:03 GMT

have a look at this thread. More info about retargeting printf here. You can also find more answers about retarget by doing a search on the forum.

RE: Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

eq — Fri, 29 May 2015 07:05:59 GMT

i added retarget.c to the project when you first mentioned it...still no luck tho..

RE: Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

Nguyen Hoan Hoang — Fri, 29 May 2015 07:03:25 GMT

You need to add target.c to your project. Target will overwrite the _write function of the default library.

RE: Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

eq — Fri, 29 May 2015 06:55:16 GMT

printf still prints nothing...not sure what to do with retarget i guess...

RE: Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

Nguyen Hoan Hoang — Fri, 29 May 2015 06:50:21 GMT

You don't call _write. _write is called by printf.

RE: Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

eq — Fri, 29 May 2015 05:25:13 GMT

Thanks. I switched to _write from retarget.c and now only the first character is displayed and then it stops.

RE: Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

Nguyen Hoan Hoang — Fri, 29 May 2015 02:53:43 GMT

That is what require to reroute stdio over uart.

RE: Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

eq — Fri, 29 May 2015 02:37:33 GMT

That file uses uart_putstring also which doesn't work for me

RE: Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

Nguyen Hoan Hoang — Fri, 29 May 2015 02:24:39 GMT

Look in libraries/uart for file retarget.c