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

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

Martin Lesund — Fri, 20 Apr 2018 13:24:55 GMT

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.

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

Bharat — Fri, 20 Apr 2018 05:06:08 GMT

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

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

Martin Lesund — Thu, 19 Apr 2018 13:07:40 GMT

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?

[quote user=""]but other pheripherals like UART & all are not working.[/quote]

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

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

Bharat — Thu, 19 Apr 2018 05:35:28 GMT

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);
}

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

Martin Lesund — Wed, 18 Apr 2018 14:11:21 GMT

Hi Bharat,

[quote user=""] the oscilloscope but other pheripherals like UART & all are not working. It seems like a system is crashed.[/quote]

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?

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

Bharat — Wed, 18 Apr 2018 09:57:14 GMT

Hello Martin,

Just want to confirm that is this issue related to nRF51-DK or ARM Mbed IDE.

Waiting for the reply.

Regards

Bharat

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

Bharat — Tue, 17 Apr 2018 11:26:58 GMT

Hello Martin Lesund,

Thanks for the immediate reply.

Link was given only for PWM related code snippet.

Can I use PWM library example (SDK v12.3) on ARM Mbed IDE, If yes then can you please send source code for the same as my project is on Mbed IDE only.

It would be grateful if you suggest to resolve this issue.

Regards

Bharat Gopani

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

Martin Lesund — Tue, 17 Apr 2018 11:12:42 GMT

Hello Bharat,

I am not too familiar with the Mbed IDE, but from the looks of the link you provided only the PWM is initialised.

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

There you can easily initialize and enable UART in the "sdk_config.h" file.

Here is a thread with some useful links on how you could get started.