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GPIOTE handler module. More...

Macros

#define GPIOTE_USER_NODE_SIZE   20
 
#define NO_OF_PINS   32
 
#define APP_GPIOTE_BUF_SIZE(MAX_USERS)   ((MAX_USERS) * GPIOTE_USER_NODE_SIZE)
 Compute number of bytes required to hold the GPIOTE data structures. More...
 
#define APP_GPIOTE_INIT(MAX_USERS)
 Macro for initializing the GPIOTE module. More...
 

Typedefs

typedef uint8_t app_gpiote_user_id_t
 
typedef void(* app_gpiote_event_handler_t )(uint32_t event_pins_low_to_high, uint32_t event_pins_high_to_low)
 GPIOTE event handler type.
 

Functions

uint32_t app_gpiote_init (uint8_t max_users, void *p_buffer)
 Function for initializing the GPIOTE module. More...
 
uint32_t app_gpiote_user_register (app_gpiote_user_id_t *p_user_id, uint32_t pins_low_to_high_mask, uint32_t pins_high_to_low_mask, app_gpiote_event_handler_t event_handler)
 Function for registering a GPIOTE user. More...
 
uint32_t app_gpiote_user_enable (app_gpiote_user_id_t user_id)
 Function for informing the GPIOTE module that the specified user wants to use the GPIOTE module. More...
 
uint32_t app_gpiote_user_disable (app_gpiote_user_id_t user_id)
 Function for informing the GPIOTE module that the specified user is done using the GPIOTE module. More...
 
uint32_t app_gpiote_pins_state_get (app_gpiote_user_id_t user_id, uint32_t *p_pins)
 Function for getting the state of the pins which are registered for the specified user. More...
 

Detailed Description

The GPIOTE handler allows several modules ("users") to share the GPIOTE interrupt, each user defining a set of pins able to generate events to the user. When a GPIOTE interrupt occurs, the GPIOTE interrupt handler will call the event handler of each user for which at least one of the pins generated an event.

The GPIOTE users are responsible for configuring all their corresponding pins, except the SENSE field, which should be initialized to GPIO_PIN_CNF_SENSE_Disabled. The SENSE field will be updated by the GPIOTE module when it is enabled or disabled, and also while it is enabled.

The module specifies on which pins events should be generated if the pin(s) goes from low->high or high->low or both directions.

Note
Even if the application is using the Scheduler, the GPIOTE event handlers will be called directly from the GPIOTE interrupt handler.

Macro Definition Documentation

#define GPIOTE_USER_NODE_SIZE   20

Size of app_gpiote.gpiote_user_t (only for use inside APP_GPIOTE_BUF_SIZE()).

#define NO_OF_PINS   32

Number of GPIO pins on the nRF51 chip.

#define APP_GPIOTE_BUF_SIZE (   MAX_USERS)    ((MAX_USERS) * GPIOTE_USER_NODE_SIZE)
Parameters
[in]MAX_USERSMaximum number of GPIOTE users.
Returns
Required buffer size (in bytes).
#define APP_GPIOTE_INIT (   MAX_USERS)
Value:
do \
{ \
static uint32_t app_gpiote_buf[CEIL_DIV(APP_GPIOTE_BUF_SIZE(MAX_USERS), sizeof(uint32_t))];\
uint32_t ERR_CODE = app_gpiote_init((MAX_USERS), app_gpiote_buf); \
APP_ERROR_CHECK(ERR_CODE); \
} while (0)

It will handle dimensioning and allocation of the memory buffer required by the module, making sure that the buffer is correctly aligned.

Parameters
[in]MAX_USERSMaximum number of GPIOTE users.
Note
Since this macro allocates a buffer, it must only be called once (it is OK to call it several times as long as it is from the same location, e.g. to do a reinitialization).

Function Documentation

uint32_t app_gpiote_init ( uint8_t  max_users,
void *  p_buffer 
)
Note
Normally initialization should be done using the APP_GPIOTE_INIT() macro, as that will allocate the buffer needed by the GPIOTE module (including aligning the buffer correctly).
Parameters
[in]max_usersMaximum number of GPIOTE users.
[in]p_bufferPointer to memory buffer for internal use in the app_gpiote module. The size of the buffer can be computed using the APP_GPIOTE_BUF_SIZE() macro. The buffer must be aligned to a 4 byte boundary.
Return values
NRF_SUCCESSSuccessful initialization.
NRF_ERROR_INVALID_PARAMInvalid parameter (buffer not aligned to a 4 byte boundary).
uint32_t app_gpiote_user_register ( app_gpiote_user_id_t *  p_user_id,
uint32_t  pins_low_to_high_mask,
uint32_t  pins_high_to_low_mask,
app_gpiote_event_handler_t  event_handler 
)
Parameters
[out]p_user_idId for the new GPIOTE user.
[in]pins_low_to_high_maskMask defining which pins will generate events to this user when state is changed from low->high.
[in]pins_high_to_low_maskMask defining which pins will generate events to this user when state is changed from high->low.
[in]event_handlerPointer to function to be executed when an event occurs.
Return values
NRF_SUCCESSSuccessful initialization.
NRF_ERROR_INVALID_PARAMInvalid parameter (buffer not aligned to a 4 byte boundary).
NRF_ERROR_INALID_STATEIf app_gpiote_init has not been called on the GPIOTE module.
NRF_ERROR_NO_MEMReturned if the application tries to register more users than defined when the GPIOTE module was initialized in app_gpiote_init.
uint32_t app_gpiote_user_enable ( app_gpiote_user_id_t  user_id)
Parameters
[in]user_idId of user to enable.
Return values
NRF_SUCCESSOn success.
NRF_ERROR_INVALID_PARAMInvalid user_id provided, No a valid user.
NRF_ERROR_INALID_STATEIf app_gpiote_init has not been called on the GPIOTE module.
uint32_t app_gpiote_user_disable ( app_gpiote_user_id_t  user_id)
Parameters
[in]user_idId of user to enable.
Returns
NRF_SUCCESS On success.
Return values
NRF_ERROR_INVALID_PARAMInvalid user_id provided, No a valid user.
NRF_ERROR_INALID_STATEIf app_gpiote_init has not been called on the GPIOTE module.
uint32_t app_gpiote_pins_state_get ( app_gpiote_user_id_t  user_id,
uint32_t *  p_pins 
)
Parameters
[in]user_idId of user to check.
[out]p_pinsBit mask corresponding to the pins configured to generate events to the specified user. All bits corresponding to pins in the state 'high' will have value '1', all others will have value '0'.
Returns
NRF_SUCCESS On success.
Return values
NRF_ERROR_INVALID_PARAMInvalid user_id provided, No a valid user.
NRF_ERROR_INALID_STATEIf app_gpiote_init has not been called on the GPIOTE module.