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bluetooth: gatt: add macro for declaring multi instance services

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Added macro that helps to declare multi-instance services. The macro
allows to statically define service structure array. Each element of
the array is linked to the service attribute array that is provided
by the user.

Signed-off-by: Kamil Piszczek <Kamil.Piszczek@nordicsemi.no>
This commit is contained in:
Kamil Piszczek 2020-09-04 11:13:18 -04:00 • committed by Carles Cufí
commit f3c6b6eeff
1 changed files with 31 additions and 0 deletions
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31
include/bluetooth/gatt.h
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@ -452,6 +452,37 @@ ssize_t bt_gatt_attr_read_service(struct bt_conn *conn,
const Z_STRUCT_SECTION_ITERABLE(bt_gatt_service_static, _name) =\
BT_GATT_SERVICE(attr_##_name)
#define _BT_GATT_ATTRS_ARRAY_DEFINE(n, _instances, _attrs_def) \
static struct bt_gatt_attr attrs_##n[] = _attrs_def(_instances[n]);
#define _BT_GATT_SERVICE_ARRAY_ITEM(_n, _) BT_GATT_SERVICE(attrs_##_n),
/** @def BT_GATT_SERVICE_INSTANCE_DEFINE
* @brief Statically define service structure array.
*
* Helper macro to statically define service structure array. Each element
* of the array is linked to the service attribute array which is also
* defined in this scope using _attrs_def macro.
*
* @param _name Name of service structure array.
* @param _instances Array of instances to pass as user context to the
* attribute callbacks.
* @param _instance_num Number of elements in instance array.
* @param _attrs_def Macro provided by the user that defines attribute
* array for the serivce. This macro should accept single
* parameter which is the instance context.
*/
#define BT_GATT_SERVICE_INSTANCE_DEFINE( \
_name, _instances, _instance_num, _attrs_def) \
BUILD_ASSERT(ARRAY_SIZE(_instances) == _instance_num, \
"The number of array elements does not match its size"); \
UTIL_EVAL(UTIL_REPEAT( \
_instance_num, _BT_GATT_ATTRS_ARRAY_DEFINE, _instances, \
_attrs_def)) \
static struct bt_gatt_service _name[] = { \
UTIL_LISTIFY(_instance_num, _BT_GATT_SERVICE_ARRAY_ITEM) \
}
/** @def BT_GATT_SERVICE
* @brief Service Structure Declaration Macro.
*