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6 years, 2 months ago.
Printf does not work on nrf platform
Hello,
I am trying to run the following simple program on an nRF51 board
#include "mbed.h" // define the Serial object Serial pc(USBTX, USBRX); DigitalOut led1(LED1); // main() runs in its own thread in the OS int main() { mbed_error_status_t status = MBED_SUCCESS; while (true) { led1 = !led1; // Print something over the serial connection pc.printf("Blink! LED is now %d\r\n", led1.read()); wait(0.5); } }
I use the online compiler, no specific Compile macro. When I load the hex file on a nRF51 dk, the program crashes. It is enough to comment the pc.printf() line for getting the program to run correctly.
What am I doing wrong. This program is the one from the "Debugging" tutorial and is a very simple extension of the blinky program.
Thank you in advance for your help.
Regards,
Serge
1 Answer
6 years, 2 months ago.
Hi Serge, I tried your code on NRF51_DK (PCA10028) board with DAPLINK firmware installed. (https://armmbed.github.io/DAPLink/)
I see it work as expected on mbed-os 5.9.7 release commit: https://github.com/ARMmbed/mbed-os/commit/949cb49ab and mbed-os 5.10 release commit: https://github.com/ARMmbed/mbed-os/commit/610e35ddc.
I used command line compiler. Can you please let me know what environment did you use? Can you please try the above mentioned releases and see if you observe the same?
Thanks, Naveen
Team mbed.
Hi Serge,
I also tried with online compiler (mbed 5.10) based build on a NRF51 device with DAPLINK firmware and it worked as expected.
To enable the auto reset mode on DAPLink interface, please copy an empty file named auto_rst.cfg while holding the reset button on the board. By default, auto reset is off.
https://github.com/ARMmbed/DAPLink/blob/master/docs/MSD_COMMANDS.md Thanks,
Naveen
Team mbed.
posted by 04 Oct 2018
Hi Serge,
Which specific nrf51 platform are you using?
- Jenny, team Mbed
posted by Jenny Plunkett 03 Oct 2018Hi Jenny, I am using the nrf51 dk, board PCA 10028, V1.1.0. The nRF51 is running softdevice S130, version 2.0.1. Please let me know if you need further information. Regards, Serge
posted by Serge Ayer 04 Oct 2018