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circuitpython/nrf52/nrf52_ble.c

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#include "nrf52_ble.h"
#include "nrf52_board.h"
#include "app_error.h"
#include "app_fifo.h"
#include "app_timer.h"
#include "ble_advertising.h"
#include "ble_conn_params.h"
#include "ble_conn_state.h"
#include "ble_hci.h"
#include "ble_nus.h"
#include "ble_srv_common.h"
#include "fds.h"
#include "fds.h"
#include "fstorage.h"
#include "peer_manager.h"
#include "softdevice_handler.h"
#define CENTRAL_LINK_COUNT 0 /**< Number of central links used by the application. When changing this number remember to adjust the RAM settings*/
#define PERIPHERAL_LINK_COUNT 1 /**< Number of peripheral links used by the application. When changing this number remember to adjust the RAM settings*/
#define DEVICE_NAME "micropython"
#define MIN_CONN_INTERVAL MSEC_TO_UNITS(20, UNIT_1_25_MS) /**< Minimum acceptable connection interval (0.02 seconds). */
#define MAX_CONN_INTERVAL MSEC_TO_UNITS(200, UNIT_1_25_MS) /**< Maximum acceptable connection interval (0.2 second). */
#define SLAVE_LATENCY 0 /**< Slave latency. */
#define CONN_SUP_TIMEOUT MSEC_TO_UNITS(3000, UNIT_10_MS) /**< Connection supervisory timeout (3 seconds). */
#define APP_ADV_INTERVAL MSEC_TO_UNITS(25, UNIT_0_625_MS)
#define APP_ADV_TIMEOUT_IN_SECONDS 180
#define APP_TIMER_PRESCALER 0 /**< Value of the RTC1 PRESCALER register. */
#define APP_TIMER_OP_QUEUE_SIZE 4 /**< Size of timer operation queues. */
#define FIRST_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(5000, APP_TIMER_PRESCALER) /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (5 seconds). */
#define NEXT_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(30000, APP_TIMER_PRESCALER) /**< Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */
#define MAX_CONN_PARAMS_UPDATE_COUNT 3
#define SEC_PARAM_BOND 1 /**< Perform bonding. */
#define SEC_PARAM_MITM 0 /**< Man In The Middle protection not required. */
#define SEC_PARAM_LESC 0 /**< LE Secure Connections not enabled. */
#define SEC_PARAM_KEYPRESS 0 /**< Keypress notifications not enabled. */
#define SEC_PARAM_IO_CAPABILITIES BLE_GAP_IO_CAPS_NONE /**< No I/O capabilities. */
#define SEC_PARAM_OOB 0 /**< Out Of Band data not available. */
#define SEC_PARAM_MIN_KEY_SIZE 7 /**< Minimum encryption key size. */
#define SEC_PARAM_MAX_KEY_SIZE 16 /**< Maximum encryption key size. */
#define NUS_RX_FIFO_BUFFER_SIZE 64
static ble_uuid_t m_adv_uuids[] = {{BLE_UUID_NUS_SERVICE, 0}}; /**< Universally unique service identifiers. */
static ble_nus_t m_nus;
static app_fifo_t m_nus_rx_fifo;
static uint8_t m_nus_rx_fifo_buffer[NUS_RX_FIFO_BUFFER_SIZE];
static void
ble_evt_dispatch(ble_evt_t * p_ble_evt)
{
ble_conn_state_on_ble_evt(p_ble_evt);
pm_on_ble_evt(p_ble_evt);
ble_conn_params_on_ble_evt(p_ble_evt);
ble_advertising_on_ble_evt(p_ble_evt);
ble_nus_on_ble_evt(&m_nus, p_ble_evt);
}
static void
sys_evt_dispatch(uint32_t sys_evt)
{
fs_sys_event_handler(sys_evt);
ble_advertising_on_sys_evt(sys_evt);
}
static void
ble_stack_init(void)
{
nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;
// Initialize the SoftDevice handler module.
SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL);
ble_enable_params_t ble_enable_params;
uint32_t err_code = softdevice_enable_get_default_config(CENTRAL_LINK_COUNT,
PERIPHERAL_LINK_COUNT,
&ble_enable_params);
APP_ERROR_CHECK(err_code);
//Check the ram settings against the used number of links
CHECK_RAM_START_ADDR(CENTRAL_LINK_COUNT, PERIPHERAL_LINK_COUNT);
// Enable BLE stack.
err_code = softdevice_enable(&ble_enable_params);
APP_ERROR_CHECK(err_code);
// Register with the SoftDevice handler module for BLE events.
err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);
APP_ERROR_CHECK(err_code);
// Register with the SoftDevice handler module for BLE events.
err_code = softdevice_sys_evt_handler_set(sys_evt_dispatch);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for the GAP initialization.
*
* @details This function sets up all the necessary GAP (Generic Access Profile) parameters of the
* device including the device name, appearance, and the preferred connection parameters.
*/
static void
gap_params_init(void)
{
uint32_t err_code;
ble_gap_conn_params_t gap_conn_params;
ble_gap_conn_sec_mode_t sec_mode;
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);
err_code = sd_ble_gap_device_name_set(&sec_mode,
(const uint8_t *)DEVICE_NAME,
strlen(DEVICE_NAME));
APP_ERROR_CHECK(err_code);
err_code = sd_ble_gap_appearance_set(BLE_APPEARANCE_UNKNOWN);
APP_ERROR_CHECK(err_code);
memset(&gap_conn_params, 0, sizeof(gap_conn_params));
gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL;
gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL;
gap_conn_params.slave_latency = SLAVE_LATENCY;
gap_conn_params.conn_sup_timeout = CONN_SUP_TIMEOUT;
err_code = sd_ble_gap_ppcp_set(&gap_conn_params);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for handling advertising events.
*
* @details This function will be called for advertising events which are passed to the application.
*
* @param[in] ble_adv_evt Advertising event.
*/
static void
on_adv_evt(ble_adv_evt_t ble_adv_evt)
{
switch (ble_adv_evt)
{
case BLE_ADV_EVT_FAST:
break;
case BLE_ADV_EVT_IDLE:
break;
default:
break;
}
}
/**@brief Function for initializing the Advertising functionality.
*/
static void
advertising_init(void)
{
uint32_t err_code;
ble_advdata_t advdata;
// Build advertising data struct to pass into @ref ble_advertising_init.
memset(&advdata, 0, sizeof(advdata));
advdata.name_type = BLE_ADVDATA_FULL_NAME;
advdata.include_appearance = true;
advdata.flags = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
advdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
advdata.uuids_complete.p_uuids = m_adv_uuids;
ble_adv_modes_config_t options = {0};
options.ble_adv_fast_enabled = BLE_ADV_FAST_ENABLED;
options.ble_adv_fast_interval = APP_ADV_INTERVAL;
options.ble_adv_fast_timeout = APP_ADV_TIMEOUT_IN_SECONDS;
err_code = ble_advertising_init(&advdata, NULL, &options, on_adv_evt, NULL);
APP_ERROR_CHECK(err_code);
}
static void
nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
{
for (uint32_t i = 0; i < length; i++) {
// XXX
app_fifo_put(&m_nus_rx_fifo, p_data[i]);
}
}
static void
services_init(void)
{
uint32_t err_code;
ble_nus_init_t nus_init = {0};
nus_init.data_handler = nus_data_handler;
err_code = ble_nus_init(&m_nus, &nus_init);
APP_ERROR_CHECK(err_code);
m_adv_uuids[0].type = m_nus.uuid_type;
err_code = app_fifo_init(&m_nus_rx_fifo, m_nus_rx_fifo_buffer, NUS_RX_FIFO_BUFFER_SIZE);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for handling a Connection Parameters error.
*
* @param[in] nrf_error Error code containing information about what went wrong.
*/
static void conn_params_error_handler(uint32_t nrf_error)
{
APP_ERROR_HANDLER(nrf_error);
}
/**@brief Function for initializing the Connection Parameters module.
*/
static void
conn_params_init(void)
{
uint32_t err_code;
ble_conn_params_init_t cp_init;
memset(&cp_init, 0, sizeof(cp_init));
cp_init.p_conn_params = NULL;
cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY;
cp_init.next_conn_params_update_delay = NEXT_CONN_PARAMS_UPDATE_DELAY;
cp_init.max_conn_params_update_count = MAX_CONN_PARAMS_UPDATE_COUNT;
cp_init.start_on_notify_cccd_handle = BLE_GATT_HANDLE_INVALID;
cp_init.disconnect_on_fail = true;
cp_init.evt_handler = NULL;
cp_init.error_handler = conn_params_error_handler;
err_code = ble_conn_params_init(&cp_init);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for starting advertising.
*/
static void
advertising_start(void)
{
uint32_t err_code = ble_advertising_start(BLE_ADV_MODE_FAST);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for handling Peer Manager events.
*
* @param[in] p_evt Peer Manager event.
*/
static void
pm_evt_handler(pm_evt_t const * p_evt)
{
ret_code_t err_code;
switch(p_evt->evt_id)
{
case PM_EVT_BONDED_PEER_CONNECTED:
err_code = pm_peer_rank_highest(p_evt->peer_id);
if (err_code != NRF_ERROR_BUSY)
{
APP_ERROR_CHECK(err_code);
}
break;//PM_EVT_BONDED_PEER_CONNECTED
case PM_EVT_CONN_SEC_START:
break;//PM_EVT_CONN_SEC_START
case PM_EVT_CONN_SEC_SUCCEEDED:
{
NRF_LOG_PRINTF_DEBUG("Link secured. Role: %d. conn_handle: %d, Procedure: %d\r\n",
ble_conn_state_role(p_evt->conn_handle),
p_evt->conn_handle,
p_evt->params.conn_sec_succeeded.procedure);
err_code = pm_peer_rank_highest(p_evt->peer_id);
if (err_code != NRF_ERROR_BUSY)
{
APP_ERROR_CHECK(err_code);
}
}
break;//PM_EVT_CONN_SEC_SUCCEEDED
case PM_EVT_CONN_SEC_FAILED:
{
/** In some cases, when securing fails, it can be restarted directly. Sometimes it can
* be restarted, but only after changing some Security Parameters. Sometimes, it cannot
* be restarted until the link is disconnected and reconnected. Sometimes it is
* impossible, to secure the link, or the peer device does not support it. How to
* handle this error is highly application dependent. */
switch (p_evt->params.conn_sec_failed.error)
{
case PM_CONN_SEC_ERROR_PIN_OR_KEY_MISSING:
// Rebond if one party has lost its keys.
err_code = pm_conn_secure(p_evt->conn_handle, true);
if (err_code != NRF_ERROR_INVALID_STATE)
{
APP_ERROR_CHECK(err_code);
}
break;//PM_CONN_SEC_ERROR_PIN_OR_KEY_MISSING
default:
break;
}
}
break;//PM_EVT_CONN_SEC_FAILED
case PM_EVT_CONN_SEC_CONFIG_REQ:
{
// Reject pairing request from an already bonded peer.
pm_conn_sec_config_t conn_sec_config = {.allow_repairing = false};
pm_conn_sec_config_reply(p_evt->conn_handle, &conn_sec_config);
}
break;//PM_EVT_CONN_SEC_CONFIG_REQ
case PM_EVT_STORAGE_FULL:
{
// Run garbage collection on the flash.
err_code = fds_gc();
if (err_code == FDS_ERR_BUSY || err_code == FDS_ERR_NO_SPACE_IN_QUEUES)
{
// Retry.
}
else
{
APP_ERROR_CHECK(err_code);
}
}
break;//PM_EVT_STORAGE_FULL
case PM_EVT_ERROR_UNEXPECTED:
// Assert.
APP_ERROR_CHECK(p_evt->params.error_unexpected.error);
break;//PM_EVT_ERROR_UNEXPECTED
case PM_EVT_PEER_DATA_UPDATE_SUCCEEDED:
break;//PM_EVT_PEER_DATA_UPDATE_SUCCEEDED
case PM_EVT_PEER_DATA_UPDATE_FAILED:
// Assert.
APP_ERROR_CHECK_BOOL(false);
break;//PM_EVT_PEER_DATA_UPDATE_FAILED
case PM_EVT_PEER_DELETE_SUCCEEDED:
break;//PM_EVT_PEER_DELETE_SUCCEEDED
case PM_EVT_PEER_DELETE_FAILED:
// Assert.
APP_ERROR_CHECK(p_evt->params.peer_delete_failed.error);
break;//PM_EVT_PEER_DELETE_FAILED
case PM_EVT_PEERS_DELETE_SUCCEEDED:
advertising_start();
break;//PM_EVT_PEERS_DELETE_SUCCEEDED
case PM_EVT_PEERS_DELETE_FAILED:
// Assert.
APP_ERROR_CHECK(p_evt->params.peers_delete_failed_evt.error);
break;//PM_EVT_PEERS_DELETE_FAILED
case PM_EVT_LOCAL_DB_CACHE_APPLIED:
break;//PM_EVT_LOCAL_DB_CACHE_APPLIED
case PM_EVT_LOCAL_DB_CACHE_APPLY_FAILED:
// The local database has likely changed, send service changed indications.
pm_local_database_has_changed();
break;//PM_EVT_LOCAL_DB_CACHE_APPLY_FAILED
case PM_EVT_SERVICE_CHANGED_IND_SENT:
break;//PM_EVT_SERVICE_CHANGED_IND_SENT
case PM_EVT_SERVICE_CHANGED_IND_CONFIRMED:
break;//PM_EVT_SERVICE_CHANGED_IND_CONFIRMED
default:
// No implementation needed.
break;
}
}
static void
peer_manager_init(bool erase_bonds)
{
ble_gap_sec_params_t sec_param;
ret_code_t err_code;
err_code = pm_init();
APP_ERROR_CHECK(err_code);
if (erase_bonds)
{
err_code = pm_peers_delete();
APP_ERROR_CHECK(err_code);
}
memset(&sec_param, 0, sizeof(ble_gap_sec_params_t));
// Security parameters to be used for all security procedures.
sec_param.bond = SEC_PARAM_BOND;
sec_param.mitm = SEC_PARAM_MITM;
sec_param.lesc = SEC_PARAM_LESC;
sec_param.keypress = SEC_PARAM_KEYPRESS;
sec_param.io_caps = SEC_PARAM_IO_CAPABILITIES;
sec_param.oob = SEC_PARAM_OOB;
sec_param.min_key_size = SEC_PARAM_MIN_KEY_SIZE;
sec_param.max_key_size = SEC_PARAM_MAX_KEY_SIZE;
sec_param.kdist_own.enc = 1;
sec_param.kdist_own.id = 1;
sec_param.kdist_peer.enc = 1;
sec_param.kdist_peer.id = 1;
err_code = pm_sec_params_set(&sec_param);
APP_ERROR_CHECK(err_code);
err_code = pm_register(pm_evt_handler);
APP_ERROR_CHECK(err_code);
}
static void
timers_init()
{
APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, false);
}
void
nrf52_ble_init(void)
{
timers_init();
ble_stack_init();
peer_manager_init(false);
gap_params_init();
services_init();
advertising_init();
conn_params_init();
advertising_start();
}
static void
power_manage()
{
uint32_t err_code = sd_app_evt_wait();
APP_ERROR_CHECK(err_code);
}
// ########################### MP IO functions ###########################
void
mp_hal_stdout_tx_strn(const char *str, size_t len)
{
uint32_t err_code;
uint8_t *buf = (uint8_t *)str;
size_t send_len;
while (len > 0) {
if (len >= BLE_NUS_MAX_DATA_LEN)
send_len = BLE_NUS_MAX_DATA_LEN;
else
send_len = len;
err_code = ble_nus_string_send(&m_nus, buf, send_len);
if (err_code == NRF_SUCCESS) {
len -= send_len;
buf += send_len;
} else if (err_code != NRF_ERROR_INVALID_STATE) {
APP_ERROR_CHECK(err_code);
}
}
}
int
mp_hal_stdin_rx_chr()
{
uint8_t byte;
for (;;) {
if (app_fifo_get(&m_nus_rx_fifo, &byte) == NRF_SUCCESS) {
return byte;
}
power_manage();
}
}
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