Can't use Timer 2 for PWM. Error "''NRFX_TIMER2_INST_IDX' undeclared here (not in a function); did you mean 'NRFX_TIMER1_INST_IDX'?

[EricDelangis]

I am using DSK 15.3, SES 4.30 with SD 132.  The base example I am using is the ble_app_uart_c and I am adding the PWM function to drive a simple piezo buzzer.

The pwm_library example works fine running stand alone using timer 1 but when I modify the pwm_library example to use timer 2 and incorporate into my code I get this error: 'NRFX_TIMER2_INST_IDX' undeclared here (not in a function); did you mean 'NRFX_TIMER1_INST_IDX'? 

I have enabled the timer in the sdk_config.h file.  See attached screen shot.

However, nrfx_timer.h shows that timer 2 isn't enabled.  See attached picture.

I've tried cleaning the project as well as adding the enable Timer 2 at the top of my main.c code:  (Shown here as commented out since it didn't work.)

// #define NRFX_TIMER1_ENABLED TIMER1_ENABLED
// #define NRFX_TIMER2_ENABLED TIMER2_ENABLED
// NRFX_TIMER2_INST_IDX;
// #define TIMER2_ENABLED 1

What to do?

[Jørgen Holmefjord]

Hi,

App_pwm library uses the legacy driver API for the timer. You need to enable TIMER2 using the legacy config:

// <q> TIMER2_ENABLED  - Enable TIMER2 instance
 

#ifndef TIMER2_ENABLED
#define TIMER2_ENABLED 1
#endif

The legacy configs will override NRFX config in apply_old_config.h if both are present in your sdk_config.h file.

Best regards,
Jørgen

[Jørgen Holmefjord]

You need to set this in your sdk_config.h file, not in main.c. The configs in sdk_config.h will be processed by the compiler first, meaning these symbols will already be defined when the compiler reaches the lines you added in main.c.

[EricDelangis]

Hi Jorgen,

Placed: 

#ifndef TIMER2_ENABLED
#define TIMER2_ENABLED 1
#endif

...in the timer code section of sdk_config.h (around line 4900) but still got the same error.  Moved it to the top of sdk_config.h and still get the same error.

[EricDelangis]

Hi Jorgen,

Does SysTick affect Timer2?

Also tried to enable/disable nrf_timer2:

#ifndef NRFX_TIMER2_ENABLED
#define NRFX_TIMER2_ENABLED 1 // Eric Enabled
#endif

Still no go.

[Jørgen Holmefjord]

Have you double-checked that the compilation gives you an error about TIMER2?  From the screenshots you posted in your original post, the output complains about NRFX_TIMER0_INST_IDX not being defined, while it actually suggests that you meant NRFX_TIMER2_INST_IDX (which indicates that TIMER2 is in fact defined and enabled).