nrf51822/source/nRF5xCharacteristicDescriptorDiscoverer.cpp

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#include "nRF5xCharacteristicDescriptorDiscoverer.h"
#include "ble_err.h"
#include "mbed-drivers/mbed_error.h"
#include "ble/DiscoveredCharacteristicDescriptor.h"
namespace {
void emptyDiscoveryCallback(const CharacteristicDescriptorDiscovery::DiscoveryCallbackParams_t*) { }
void emptyTerminationCallback(const CharacteristicDescriptorDiscovery::TerminationCallbackParams_t*) { }
}
nRF5xCharacteristicDescriptorDiscoverer::nRF5xCharacteristicDescriptorDiscoverer(size_t concurrentConnectionsCount) :
maximumConcurrentConnectionsCount(concurrentConnectionsCount),
discoveryRunning(new Discovery[concurrentConnectionsCount]) {
}
nRF5xCharacteristicDescriptorDiscoverer::~nRF5xCharacteristicDescriptorDiscoverer() {
delete [] discoveryRunning;
}
ble_error_t nRF5xCharacteristicDescriptorDiscoverer::launch(
const DiscoveredCharacteristic& characteristic,
const CharacteristicDescriptorDiscovery::DiscoveryCallback_t& discoveryCallback,
const CharacteristicDescriptorDiscovery::TerminationCallback_t& terminationCallback
) {
Gap::Handle_t connHandle = characteristic.getConnectionHandle();
// it is ok to deduce that the start handle for descriptors is after
// the characteristic declaration and the characteristic value declaration
// see BLUETOOTH SPECIFICATION Version 4.2 [Vol 3, Part G] (3.3)
Gap::Handle_t descriptorStartHandle = characteristic.getDeclHandle() + 2;
Gap::Handle_t descriptorEndHandle = characteristic.getLastHandle();
// check if their is any descriptor to discover
if (descriptorEndHandle < descriptorStartHandle) {
CharacteristicDescriptorDiscovery::TerminationCallbackParams_t termParams = {
characteristic,
BLE_ERROR_NONE
};
terminationCallback.call(&termParams);
return BLE_ERROR_NONE;
}
// check if we can run this discovery
if (isConnectionInUse(connHandle)) {
return BLE_STACK_BUSY;
}
// get a new discovery slot, if none are available, just return
Discovery* discovery = getAvailableDiscoverySlot();
if(discovery == NULL) {
return BLE_STACK_BUSY;
}
// try to launch the discovery
ble_error_t err = gattc_descriptors_discover(connHandle, descriptorStartHandle, descriptorEndHandle);
if(!err) {
// commit the new discovery to its slot
*discovery = Discovery(characteristic, discoveryCallback, terminationCallback);
}
return err;
}
bool nRF5xCharacteristicDescriptorDiscoverer::isActive(const DiscoveredCharacteristic& characteristic) const {
return findRunningDiscovery(characteristic) != NULL;
}
void nRF5xCharacteristicDescriptorDiscoverer::requestTerminate(const DiscoveredCharacteristic& characteristic) {
Discovery* discovery = findRunningDiscovery(characteristic);
if(discovery) {
discovery->onDiscovery = emptyDiscoveryCallback;
// call terminate anyway
discovery->terminate(BLE_ERROR_NONE);
discovery->onTerminate = emptyTerminationCallback;
}
}
void nRF5xCharacteristicDescriptorDiscoverer::process(uint16_t connectionHandle, const ble_gattc_evt_desc_disc_rsp_t& descriptors) {
Discovery* discovery = findRunningDiscovery(connectionHandle);
if(!discovery) {
error("logic error in nRF5xCharacteristicDescriptorDiscoverer::process !!!");
}
for (uint16_t i = 0; i < descriptors.count; ++i) {
discovery->process(
descriptors.descs[i].handle, UUID(descriptors.descs[i].uuid.uuid)
);
}
// prepare the next discovery request (if needed)
uint16_t startHandle = descriptors.descs[descriptors.count - 1].handle + 1;
uint16_t endHandle = discovery->characteristic.getLastHandle();
if(startHandle > endHandle ||
(discovery->onDiscovery == emptyDiscoveryCallback && discovery->onTerminate == emptyTerminationCallback)) {
terminate(connectionHandle, BLE_ERROR_NONE);
return;
}
ble_error_t err = gattc_descriptors_discover(connectionHandle, startHandle, endHandle);
if(err) {
terminate(connectionHandle, err);
return;
}
}
void nRF5xCharacteristicDescriptorDiscoverer::terminate(uint16_t handle, ble_error_t err) {
Discovery* discovery = findRunningDiscovery(handle);
if(!discovery) {
error("logic error in nRF5xCharacteristicDescriptorDiscoverer::process !!!");
}
discovery->terminate(err);
removeDiscovery(discovery);
}
nRF5xCharacteristicDescriptorDiscoverer::Discovery*
nRF5xCharacteristicDescriptorDiscoverer::findRunningDiscovery(const DiscoveredCharacteristic& characteristic) {
for(size_t i = 0; i < maximumConcurrentConnectionsCount; ++i) {
if(discoveryRunning[i].characteristic == characteristic) {
return &discoveryRunning[i];
}
}
return NULL;
}
nRF5xCharacteristicDescriptorDiscoverer::Discovery*
nRF5xCharacteristicDescriptorDiscoverer::findRunningDiscovery(const DiscoveredCharacteristic& characteristic) const {
for(size_t i = 0; i < maximumConcurrentConnectionsCount; ++i) {
if(discoveryRunning[i].characteristic == characteristic) {
return &discoveryRunning[i];
}
}
return NULL;
}
nRF5xCharacteristicDescriptorDiscoverer::Discovery*
nRF5xCharacteristicDescriptorDiscoverer::findRunningDiscovery(uint16_t handle) {
for(size_t i = 0; i < maximumConcurrentConnectionsCount; ++i) {
if(discoveryRunning[i].characteristic.getConnectionHandle() == handle) {
return &discoveryRunning[i];
}
}
return NULL;
}
void nRF5xCharacteristicDescriptorDiscoverer::removeDiscovery(Discovery* discovery) {
for(size_t i = 0; i < maximumConcurrentConnectionsCount; ++i) {
if(&discoveryRunning[i] == discovery) {
discoveryRunning[i] = Discovery();
}
}
}
nRF5xCharacteristicDescriptorDiscoverer::Discovery*
nRF5xCharacteristicDescriptorDiscoverer::getAvailableDiscoverySlot() {
for(size_t i = 0; i < maximumConcurrentConnectionsCount; ++i) {
if(discoveryRunning[i] == Discovery()) {
return &discoveryRunning[i];
}
}
return NULL;
}
bool nRF5xCharacteristicDescriptorDiscoverer::isConnectionInUse(uint16_t connHandle) {
return findRunningDiscovery(connHandle) != NULL;
}
ble_error_t nRF5xCharacteristicDescriptorDiscoverer::gattc_descriptors_discover(
uint16_t connection_handle, uint16_t start_handle, uint16_t end_handle) {
ble_gattc_handle_range_t discoveryRange = {
start_handle,
end_handle
};
uint32_t err = sd_ble_gattc_descriptors_discover(connection_handle, &discoveryRange);
switch(err) {
case NRF_SUCCESS:
return BLE_ERROR_NONE;
case BLE_ERROR_INVALID_CONN_HANDLE:
return BLE_ERROR_INVALID_PARAM;
case NRF_ERROR_INVALID_ADDR:
return BLE_ERROR_PARAM_OUT_OF_RANGE;
case NRF_ERROR_BUSY:
return BLE_STACK_BUSY;
default:
return BLE_ERROR_UNSPECIFIED;
}
}