UART

RE: UART

Philip Freidin — Fri, 16 Aug 2013 03:58:08 GMT

Check that the library you are linking to includes floating point support. Make sure text_buffer is big enough. Use the debugger, try tests with simple thing like this: sprintf(text_buffer, "%6.3f", (float)12.345);

RE: UART

Guest — Fri, 16 Aug 2013 00:55:50 GMT

@Philip, I tried using sprintf(). I confirmed that no problem about int type. but, the float type of the %f don't be seen on screen. How can I solve this problem?

RE: UART

Bastiaan — Fri, 16 Aug 2013 00:55:50 GMT

@Philip, I tried using sprintf(). I confirmed that no problem about int type. but, the float type of the %f don't be seen on screen. How can I solve this problem?

RE: UART

Nils Minor — Wed, 31 Jul 2013 18:00:02 GMT

Yes the way Yalcin told you is the right way. You have to comment the #define out. If it does not work i can send you my code tomorrow.

Nils

RE: UART

Yalcin Akdogan — Wed, 31 Jul 2013 14:59:06 GMT

Thanks Philip. Yalcin

RE: UART

Philip Freidin — Wed, 31 Jul 2013 14:11:27 GMT

@Yalcim , connecting to printf is fairly well explained in the Keil documentation, but I don't know how to do it for GCC.

Although not a perfect solution, if you have simple_uart_putstring() working, then you can do this:

[b] uint8_t text_buffer[128];

sprintf( text_buffer, "Formatted answer  %8d   %8.3f\n\r",
                        intvar,  floatvar);

simple_uart_putstring( text_buffer );[/b]

RE: UART

Marc Nicholas — Tue, 30 Jul 2013 13:42:58 GMT

You just need to add simple_uart.c to your project and include simple_uart.h headers.

I generally use:

simple_uart_putstring("Some text\r\n");

To send my debugging output.

If you're using the nRF51822-EK, configure the onboard USB UART with:

simple_uart_config (0, 9, 0, 11, false):

And set your baud rate on your terminal program to 38.4K and find the USB CDC serial port that should appear.

I'm embarrassed to say that I didn't even clue-in to the onboard CDC emulation at first :-/

Hope that helps.

-m

RE: UART

Yalcin Akdogan — Tue, 30 Jul 2013 12:23:24 GMT

In simple_uart project in the main.c

do not #define ENABLE_LOOPBACK_TEST
comment out the simple_uart_get() function call. otherwise main function is waiting all the time for input. Yalcin

RE: UART

Bastiaan — Tue, 30 Jul 2013 11:55:58 GMT

Hi Nils,

could you tell us what your mistake was? It is not running for me. Are you using SoftDevice also?

RE: UART

Guest — Tue, 30 Jul 2013 11:55:58 GMT

Hi Nils,

could you tell us what your mistake was? It is not running for me. Are you using SoftDevice also?

RE: UART

Audun — Tue, 30 Jul 2013 11:20:19 GMT

great :)

RE: UART

Nils Minor — Tue, 30 Jul 2013 11:18:33 GMT

Thanks, yes i made a silly mistake. Its running now with the simple_uart example. :)

RE: UART

Audun — Tue, 30 Jul 2013 10:36:07 GMT

Hi,

there are a few UART examples in the SDK, depending on which hardware you are using (Evaluation Kit or Development Kit). If you are using the PCA10001 Evaluation board, take a look at nrf51822\Board\pca10001\uart_example. This example uses the com port interface, which is conveniently accessed via the USB. Albeit this example is quite simple..

As far as I know, app_uart is part of the HCI transport layer, which is used in the connectivity chip examples. This transport layer is quite complex and not something you would use as a monitoring tool for debugging.

RE: UART

Nils Minor — Tue, 30 Jul 2013 08:15:10 GMT

I started with eclipse and gcc, but didn't get it to work fine. Now i am working with Keil, normaly it works fine.

But i need an monitor on the pc to talk with the device in the runtime, like you need it, right?

nils

RE: UART

Guest — Tue, 30 Jul 2013 08:12:09 GMT

Hi Nils, I am sorry, from your earlier mails I had the impression, you are using Eclipse.

Yalcin

RE: UART

Bastiaan — Tue, 30 Jul 2013 08:12:09 GMT

Hi Nils, I am sorry, from your earlier mails I had the impression, you are using Eclipse.

Yalcin

RE: UART

Yalcin Akdogan — Tue, 30 Jul 2013 08:05:07 GMT

I need also help to send printf outputs via UART to a serial terminal.

I am also working on Eclipse + GCC environment and using Evaluation Kit and my BLE application uses S110_SoftDevice.

questions are:

Which uart- support files from Nordic S. SDK are to add to the build?
How to connect (printf -- putc)?
Which way make more sense? Using either USB (COMx) or other GPIOs as UART output?

Yalcin