AN36 Button handling warning

Question

I'm sorry if I'm missing something...
AN36 p.29 has a code snippet: 
 static app_button_cfg_t buttons[] = {
 {WAKEUP_BUTTON_PIN, false, NRF_GPIO_PIN_PULLUP, NULL},
 {LEDBUTTON_BUTTON_PIN_NO, false, NRF_GPIO_PIN_PULLUP, button_event_handler},
};
 
 app_button_cfg_t is defined in app_button.h as: 
 typedef struct {
 uint8_t pin_no;
 bool active_high;
 nrf_gpio_pin_pull_t pull_cfg;
 app_button_handler_t button_handler; 
} app_button_cfg_t;
 
 app_button_handler_t is defined at the same place as: 
 typedef void (*app_button_handler_t)(uint8_t pin_no);
 
 AN36 p.30 defines button_event_handler from p.29 as: 
 static void button_event_handler(uint8_t pin_no, uint8_t button action);
 
 And as a result there is a type mismatch warning. 
 What am I missing? 
 Thank you.

kb · Accepted Answer

It seems to be due to your using an older/different version of app_button.h. 
 This is the typedef I have in my copy of the same file: 
 /**@brief Button event handler type. */
typedef void (*app_button_handler_t)(uint8_t pin_no, uint8_t button_action);