Interrupt in BLE Central example: The location of a specific callback?

[Erik]

Hello Nordic Devzone.:

When studying the 8.0 BLE Central multilink example (s120 softdevice), I looked into the component relevant to button pressing interrupts, app_button.c, I reckon that the member "button_handler" of the struct:

typedef struct
{
    uint8_t              pin_no;           /**< Pin to be used as a button. */
    uint8_t              active_state;     /**< APP_BUTTON_ACTIVE_HIGH or APP_BUTTON_ACTIVE_LOW. */
    nrf_gpio_pin_pull_t  pull_cfg;         /**< Pull-up or -down configuration. */
    app_button_handler_t button_handler;   /**< Handler to be called when button is pushed. */
} app_button_cfg_t;

is a callback function pointer that will later be pointed to the appropriate function during run time. The problem is, I can't seem to find the line where such a pointing process happens, or in other words, where is the line of code tell the pointer to point specifically at the correct handler function?

Regarding how the function pointer works, I could have made a wrong guess, but based on my experience, it usually is the case.

Erik

[Anders Strand]

You are correct.

However, i do not find any reference to app_button.c in the multilink central example.

The pointer is typically set during an initiation, and is passed to app_button_init().

[Erik]

I am so sorry, I made a mistake when posting the question.

The reference to app_button was by s110, another example that must run hand in hand with the s120 example, since you need both central and peripheral. So you may need to find the reference to that module in the s110 part of the example.