nRF51-DK on Mbed IDE : When one PwmOut is enabled in my project, system crashes.

[Bharat]

Hi

I am working on nRF51-DK with Mbed IDE & used PWM example code from  link : https://os.mbed.com/handbook/PwmOut

When enabled PwmOut, PWM signal is observed on the oscilloscope but other pheripherals like UART & all  are not working. It seems like a system is crashed.

It would be grateful if anyone helps me to resolve this issue.

Regards

Bharat Gopani

[Martin Lesund]

Hi Bharat,

the oscilloscope but other pheripherals like UART & all  are not working. It seems like a system is crashed.

I need more information from you. 

- Have you chosen a pin for the PWM that doesn't  get used by anything else

(in the example you sent the LED1 is used, so that could cause an issue)

- Send me you code

- How do you know the system crashed, do you have any error codes and such?

 

[Bharat]

Hello Martin,

Thanks for the reply.

Yes, system seems to be crashed.

A pin for PWM doesn't get used anything else.

PFB the code snippet.

When PwmOut is not enabled, LED1 blinks every second but when I enabled the PwmOut , LED1 is not blinking at every second but PWM pulses are observed at Pin P0.16 on oscilloscope.

Waiting for the reply.

#include "mbed.h"   PwmOut VMPWM(P0_16);  //P0.16 for the PWM  DigitalOut led1(LED1);        // P0.21 for LED1   void periodicCallback(void) {      led1 = !led1; }       int main(void) {   VMPWM.period(0.01f);       // 10 ms period VMPWM = 0.2f;                       // 20 %    Ticker ticker;  ticker.attach(periodicCallback,1);     // In Seconds.    while(1); }

[Martin Lesund]

Hi Bharat,

What do you mean by the "System seems to be crashed"? Do your device stop working? Error codes?

Is this the code that has the issue or is this the "working" code?

but other pheripherals like UART & all  are not working.

From your code that you posted, you have not initialized UART and such. 

 

I would highly recommend you to use our SDK v12.3 (download link) and use the PWM library example as reference. 

You can find the source code and the project file of the example in the following folder: <InstallFolder>\examples\peripheral\pwm_library

[Bharat]

Hi Martin,

For simpification purpose, I have sent you code snippet(Not including UART) for PWM & LED1 which also crashes when PwmOut is enabled.

Is there any chance to go microcontroller into deep sleep mode when PwmOut is enabled.

May I know how to wake up microcontroler(nRF51422)  from the deep sleep mode on ARM Mbed Compiler ?

Can I use your PWM  library example code on ARM Mbed Compiler  ?

Waiting for the reply.

Regards

Bharat

[Martin Lesund]

Hi Bharat, 

Unfortunately I have limited knowledge about the Mbed IDE and their ways of doing things.

I would recommend you to use their forum.

If you want to use an RTOS I would recommend Zephyr  for your nRF51 device.