Setting a PWM in a seperat library

[Mechatroniker]

I try to execute the PWM settings via the library in an extra .h/.c file to keep my main method as small as possible. Unfortunately the program sticks in the ErrCheck and does not execute the PWM. Unfortunately I can not find the error and there is no error displayed when building and transferring.

Here you can see the funktionen_pwm.c file:

This is the associated funktionen_pwm.h file:

And this is the main.c :

I hope someone can help me with this error.

Greetings

[awneil]

Mechatroniker said:

the program sticks in the ErrCheck

So use the debugger to put a breakpoint there, and see what the error is.

not as an image!

[Mechatroniker]

Thank you very much for your quick reply.
When I run the program with the debugger, it writes at the position
err_code = app_pwm_init(&motor_pwm, &pwm_config, status_pwm_handler);  
0x000000 in the ErrCode. If I continue with the debugger it jumps back to the main.c file. If I go further it jumps back to the functions_pwm.c file and writes 0x00000004 to the ErrCode, then it jumps to the app_error_wak.c file and stays at the position
NRF_BREAKPOINT_COND;
Also with several further switching the program remains now at this place.

In the Stack this Code appears:

Here my C Code again:

main.c

#include <stdbool.h>
#include <stdint.h>
#include "nrf.h"
#include "app_error.h"
#include "bsp.h"
#include "nrf_delay.h"
#include "app_pwm.h"


#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"

#include "funktionen_pwm.h"

uint32_t an = 99;
uint32_t aus = 1;



int main(void)
{
    #ifdef PIN
     pins_konfigurieren();
     nrf_gpio_pin_set(15);
      nrf_gpio_pin_clear(14);
    #endif

    initialisierung_pwm();

    while (true)
    {
        wert_setzen_pwm(an);
        nrf_delay_ms(3);
        wert_setzen_pwm(aus);
        nrf_delay_ms(2);

    }

}


/** @} */

funktionen_pwm.c

#include <stdbool.h>
#include <stdint.h>
#include "nrf.h"
#include "app_error.h"
#include "app_pwm.h"

const app_pwm_t motor_pwm;

void initialisierung_pwm(void)
{ 
    APP_PWM_INSTANCE(motor_pwm, 1);

    #define M_CONTR_PWM 16
    #define frequenz_teiler  1000

    static volatile bool status_pwm;
    void status_pwm_handler(uint32_t pwm_id)
    {
        status_pwm = true; 
    }
    ret_code_t err_code;
    app_pwm_config_t pwm_config = APP_PWM_DEFAULT_CONFIG_1CH(frequenz_teiler, M_CONTR_PWM);
    pwm_config.pin_polarity[0] = APP_PWM_POLARITY_ACTIVE_HIGH;
    err_code = app_pwm_init(&motor_pwm, &pwm_config, status_pwm_handler);
    APP_ERROR_CHECK(err_code);
    app_pwm_enable(&motor_pwm);
    while(app_pwm_channel_duty_set(&motor_pwm, 0, 99) == NRF_ERROR_BUSY);
}


void wert_setzen_pwm(uint16_t Wert_PWM)
{
     while(app_pwm_channel_duty_set(&motor_pwm, 0, Wert_PWM) == NRF_ERROR_BUSY);
}

funktionen_pwm.h

#ifndef FUNKTIONEN_PWM_H_
#define FUNKTIONEN_PWM_H_



void initialisierung_pwm(void);
void wert_setzen_pwm(uint16_t);


#endif

[awneil]

Mechatroniker said:

writes 0x00000004 to the ErrCode

So look up that value to see what it means.

The documentation for each SDK function call lists its possible error returns.

You can find the documentation by doing a 'Go To Declaration' (not definition) - the documentation is in the comments in the header file.

[Mechatroniker]

I finally found the mistake :)

The command APP_PWM_INSTANCE(motor_pwm, 1); must be placed before the main.

Thanks for your help