printf only sends a single byte?

RE: printf only sends a single byte?

hawk — Sat, 14 Nov 2015 07:59:26 GMT

yes, you must use app_uart_fifo.c, not app_uart.c, it had better modfiy the document of nordic nrf51.

RE: printf only sends a single byte?

hawk — Sat, 14 Nov 2015 07:50:58 GMT

hi,Peter:
app_trace_init()/app_trace_log() of SDK9.0 i test , it is ok.. in your code, please add while(1) code. otherwise, when you are printing, the main is ended. so you just print the fist char of your message...

notice: when your print a lots of message , please give some time deleay using nrf_delay_ms(),

int main(void) {
// Setup tracing. Also sets up UART. app_trace_init();

app_trace_log("Starting...\r\n");

while(1){ ; // just wait..

}

RE: printf only sends a single byte?

Peter — Wed, 07 Jan 2015 00:54:23 GMT

"You have to check which kind of app_uart you have linked to your project. App_trace requires app_uart_fifo.c"

Wojciech Jasko posted that solution as a comment in another question. I'm not sure if it solved the original poster's problem, but it answers this question here.

In Keil uVision, you can choose the FIFO version of UART by going to Manage Run-Time Environment->nRF_Driver->app_uart and chose "Fifo" for the variant drop-down.

RE: printf only sends a single byte?

Peter — Wed, 07 Jan 2015 00:48:35 GMT

I'd like to go this route eventually. It looks like Nordic's libraries only support UART for trace output, though.

RE: printf only sends a single byte?

Peter — Thu, 18 Dec 2014 23:55:14 GMT

Wojciech Jasko's comment on your thread fixed my issue. I asked him to post the comment as an answer here.

RE: printf only sends a single byte?

Lucast85 — Thu, 18 Dec 2014 23:14:05 GMT

I use Segger RTT feature for printf and debug. I think it's a similar feature. It works very well with my nRF51822-EK and its embedded J-Link debugger!! Maybe could help..

RE: printf only sends a single byte?

cpignol — Thu, 18 Dec 2014 21:48:55 GMT

I got the same problem cf thread devzone.nordicsemi.com/.../