/* Copyright 2016 The Chromium OS Authors. All rights reserved. * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ #include "bluetooth_le_ll.h" #include "bluetooth_le.h" #include "btle_hci_int.h" #include "util.h" #include "console.h" #include "radio.h" #include "radio_test.h" #include "task.h" #include "timer.h" #ifdef CONFIG_BLUETOOTH_LL_DEBUG #define CPUTS(outstr) cputs(CC_BLUETOOTH_LL, outstr) #define CPRINTS(format, args...) cprints(CC_BLUETOOTH_LL, format, ## args) #define CPRINTF(format, args...) cprintf(CC_BLUETOOTH_LL, format, ## args) #else /* CONFIG_BLUETOOTH_LL_DEBUG */ #define CPUTS(outstr) #define CPRINTS(format, args...) #define CPRINTF(format, args...) #endif /* CONFIG_BLUETOOTH_LL_DEBUG */ /* Link Layer */ enum ll_state_t ll_state = UNINITIALIZED; static struct hciLeSetAdvParams ll_adv_params; static struct hciLeSetScanParams ll_scan_params; static int ll_adv_interval_us; static int ll_adv_timeout_us; static struct ble_pdu ll_adv_pdu; static struct ble_pdu ll_scan_rsp_pdu; static struct ble_pdu tx_packet_1; static struct ble_pdu *packet_tb_sent; static struct ble_connection_params conn_params; static int connection_initialized; static struct remapping_table remap_table; static uint64_t receive_time, last_receive_time; static uint8_t num_consecutive_failures; static uint32_t tx_end, tx_rsp_end, time_of_connect_req; struct ble_pdu ll_rcv_packet; static uint32_t ll_conn_events; static uint32_t errors_recovered; int ll_power; uint8_t is_first_data_packet; static uint64_t ll_random_address = 0xC5BADBADBAD1; /* Uninitialized */ static uint64_t ll_public_address = 0xC5BADBADBADF; /* Uninitialized */ static uint8_t ll_channel_map[5] = {0xff, 0xff, 0xff, 0xff, 0x1f}; static uint8_t ll_filter_duplicates; int ll_pseudo_rand(int max_plus_one) { static uint32_t lfsr = 0x55555; int lsb = lfsr & 1; lfsr = lfsr >> 1; if (lsb) lfsr ^= 0x80020003; /* Bits 32, 22, 2, 1 */ return lfsr % max_plus_one; } uint8_t ll_set_tx_power(uint8_t *params) { /* Add checking */ ll_power = params[0]; return HCI_SUCCESS; } uint8_t ll_read_tx_power(void) { return ll_power; } /* LE Information */ uint8_t ll_read_buffer_size(uint8_t *return_params) { return_params[0] = LL_MAX_DATA_PACKET_LENGTH & 0xff; return_params[1] = (LL_MAX_DATA_PACKET_LENGTH >> 8) & 0xff; return_params[2] = LL_MAX_DATA_PACKETS; return HCI_SUCCESS; } uint8_t ll_read_local_supported_features(uint8_t *return_params) { uint64_t supported_features = LL_SUPPORTED_FEATURES; memcpy(return_params, &supported_features, sizeof(supported_features)); return HCI_SUCCESS; } uint8_t ll_read_supported_states(uint8_t *return_params) { uint64_t supported_states = LL_SUPPORTED_STATES; memcpy(return_params, &supported_states, sizeof(supported_states)); return HCI_SUCCESS; } uint8_t ll_set_host_channel_classification(uint8_t *params) { memcpy(ll_channel_map, params, sizeof(ll_channel_map)); return HCI_SUCCESS; } /* Advertising */ uint8_t ll_set_scan_response_data(uint8_t *params) { if (params[0] > BLE_MAX_ADV_PAYLOAD_OCTETS) return HCI_ERR_Invalid_HCI_Command_Parameters; if (ll_state == ADVERTISING) return HCI_ERR_Controller_Busy; memcpy(&ll_scan_rsp_pdu.payload[BLUETOOTH_ADDR_OCTETS], ¶ms[1], params[0]); ll_scan_rsp_pdu.header.adv.length = params[0] + BLUETOOTH_ADDR_OCTETS; return HCI_SUCCESS; } uint8_t ll_set_adv_data(uint8_t *params) { if (params[0] > BLE_MAX_ADV_PAYLOAD_OCTETS) return HCI_ERR_Invalid_HCI_Command_Parameters; if (ll_state == ADVERTISING) return HCI_ERR_Controller_Busy; /* Skip the address */ memcpy(&ll_adv_pdu.payload[BLUETOOTH_ADDR_OCTETS], ¶ms[1], params[0]); ll_adv_pdu.header.adv.length = params[0] + BLUETOOTH_ADDR_OCTETS; return HCI_SUCCESS; } uint8_t ll_reset(void) { ll_state = UNINITIALIZED; radio_disable(); ble_radio_clear_white_list(); return HCI_SUCCESS; } static uint8_t ll_state_change_request(enum ll_state_t next_state) { /* Initialize the radio if it hasn't been initialized */ if (ll_state == UNINITIALIZED) { if (ble_radio_init(BLE_ADV_ACCESS_ADDRESS, BLE_ADV_CRCINIT) != EC_SUCCESS) return HCI_ERR_Hardware_Failure; ll_state = STANDBY; } /* Only change states when the link layer is in STANDBY */ if (next_state != STANDBY && ll_state != STANDBY) return HCI_ERR_Controller_Busy; ll_state = next_state; return HCI_SUCCESS; } uint8_t ll_set_advertising_enable(uint8_t *params) { uint8_t rv; if (params[0]) { rv = ll_state_change_request(ADVERTISING); if (rv == HCI_SUCCESS) task_wake(TASK_ID_BLE_LL); } else { rv = ll_state_change_request(STANDBY); } return rv; } uint8_t ll_set_scan_enable(uint8_t *params) { uint8_t rv; if (params[0]) { ll_filter_duplicates = params[1]; rv = ll_state_change_request(SCANNING); if (rv == HCI_SUCCESS) task_wake(TASK_ID_BLE_LL); } else { rv = ll_state_change_request(STANDBY); } return HCI_SUCCESS; } void set_empty_data_packet(struct ble_pdu *pdu) { /* LLID == 1 means incomplete or empty data packet */ pdu->header.data.llid = 1; pdu->header.data.nesn = 1; pdu->header.data.sn = 0; pdu->header.data.md = 0; pdu->header.data.length = 0; pdu->header_type_adv = 0; } /* Connection state */ /** * This function serves to take data from a CONNECT_REQ packet and copy it * into a struct, conn_params, which defines the parameter of the connection. * It also fills a remapping table, another essential element of the link * layer connection. */ uint8_t initialize_connection(void) { int cur_offset = 0, i = 0; uint8_t final_octet = 0; uint8_t remap_arr[5]; uint8_t *payload_start = (uint8_t *)(ll_rcv_packet.payload); num_consecutive_failures = 0; /* Copy data into the appropriate portions of memory */ memcpy((uint8_t *)&(conn_params.init_a), payload_start, CONNECT_REQ_INITA_LEN); cur_offset += CONNECT_REQ_INITA_LEN; memcpy((uint8_t *)&(conn_params.adv_a), payload_start+cur_offset, CONNECT_REQ_ADVA_LEN); cur_offset += CONNECT_REQ_ADVA_LEN; memcpy(&(conn_params.access_addr), payload_start+cur_offset, CONNECT_REQ_ACCESS_ADDR_LEN); cur_offset += CONNECT_REQ_ACCESS_ADDR_LEN; conn_params.crc_init_val = 0; memcpy(&(conn_params.crc_init_val), payload_start+cur_offset, CONNECT_REQ_CRC_INIT_VAL_LEN); cur_offset += CONNECT_REQ_CRC_INIT_VAL_LEN; memcpy(&(conn_params.win_size), payload_start+cur_offset, CONNECT_REQ_WIN_SIZE_LEN); cur_offset += CONNECT_REQ_WIN_SIZE_LEN; memcpy(&(conn_params.win_offset), payload_start+cur_offset, CONNECT_REQ_WIN_OFFSET_LEN); cur_offset += CONNECT_REQ_WIN_OFFSET_LEN; memcpy(&(conn_params.interval), payload_start+cur_offset, CONNECT_REQ_INTERVAL_LEN); cur_offset += CONNECT_REQ_INTERVAL_LEN; memcpy(&(conn_params.latency), payload_start+cur_offset, CONNECT_REQ_LATENCY_LEN); cur_offset += CONNECT_REQ_LATENCY_LEN; memcpy(&(conn_params.timeout), payload_start+cur_offset, CONNECT_REQ_TIMEOUT_LEN); cur_offset += CONNECT_REQ_TIMEOUT_LEN; conn_params.channel_map = 0; memcpy(&(conn_params.channel_map), payload_start+cur_offset, CONNECT_REQ_CHANNEL_MAP_LEN); cur_offset += CONNECT_REQ_CHANNEL_MAP_LEN; memcpy(&final_octet, payload_start+cur_offset, CONNECT_REQ_HOP_INCREMENT_AND_SCA_LEN); /* last 5 bits of final_octet: */ conn_params.hop_increment = final_octet & 0x1f; /* first 3 bits of final_octet: */ conn_params.sleep_clock_accuracy = (final_octet & 0xe0) >> 5; /* Set up channel mapping table */ for (i = 0; i < 5; ++i) remap_arr[i] = *(((uint8_t *)&(conn_params.channel_map))+i); fill_remapping_table(&remap_table, remap_arr, conn_params.hop_increment); /* Calculate transmission window parameters */ conn_params.transmitWindowSize = conn_params.win_size * 1250; conn_params.transmitWindowOffset = conn_params.win_offset * 1250; conn_params.connInterval = conn_params.interval * 1250; /* The following two lines convert ms -> microseconds */ conn_params.connSlaveLatency = 1000 * conn_params.latency; conn_params.connSupervisionTimeout = 10000 * conn_params.timeout; /* All these times are in microseconds! */ /* Check for common transmission errors */ if (conn_params.hop_increment < 5 || conn_params.hop_increment > 16) { for (i = 0; i < 5; ++i) CPRINTF("ERROR!! ILLEGAL HOP_INCREMENT!!\n"); return HCI_ERR_Invalid_LMP_Parameters; } is_first_data_packet = 1; return HCI_SUCCESS; } /* White List */ uint8_t ll_clear_white_list(void) { if (ble_radio_clear_white_list() == EC_SUCCESS) return HCI_SUCCESS; else return HCI_ERR_Hardware_Failure; } uint8_t ll_read_white_list_size(uint8_t *return_params) { if (ble_radio_read_white_list_size(return_params) == EC_SUCCESS) return HCI_SUCCESS; else return HCI_ERR_Hardware_Failure; } uint8_t ll_add_device_to_white_list(uint8_t *params) { if (ble_radio_add_device_to_white_list(¶ms[1], params[0]) == EC_SUCCESS) return HCI_SUCCESS; else return HCI_ERR_Host_Rejected_Due_To_Limited_Resources; } uint8_t ll_remove_device_from_white_list(uint8_t *params) { if (ble_radio_remove_device_from_white_list(¶ms[1], params[0]) == EC_SUCCESS) return HCI_SUCCESS; else return HCI_ERR_Hardware_Failure; } /* Connections */ uint8_t ll_read_remote_used_features(uint8_t *params) { uint16_t handle = params[0] | (((uint16_t)params[1]) << 8); CPRINTS("Read remote used features for handle %d", handle); /* Check handle */ return HCI_SUCCESS; } /* RF PHY Testing */ static int ll_test_packets; uint8_t ll_receiver_test(uint8_t *params) { int rv; ll_test_packets = 0; /* See if the link layer is busy */ rv = ll_state_change_request(TEST_RX); if (rv) return rv; rv = ble_test_rx_init(params[0]); if (rv) return rv; CPRINTS("Start Rx test"); task_wake(TASK_ID_BLE_LL); return HCI_SUCCESS; } uint8_t ll_transmitter_test(uint8_t *params) { int rv; ll_test_packets = 0; /* See if the link layer is busy */ rv = ll_state_change_request(TEST_TX); if (rv) return rv; rv = ble_test_tx_init(params[0], params[1], params[2]); if (rv) return rv; CPRINTS("Start Tx test"); task_wake(TASK_ID_BLE_LL); return HCI_SUCCESS; } uint8_t ll_test_end(uint8_t *return_params) { CPRINTS("End (%d packets)", ll_test_packets); ble_test_stop(); if (ll_state == TEST_RX) { return_params[0] = ll_test_packets & 0xff; return_params[1] = (ll_test_packets >> 8); ll_test_packets = 0; } else { return_params[0] = 0; return_params[1] = 0; ll_test_packets = 0; } return ll_reset(); } uint8_t ll_set_random_address(uint8_t *params) { /* No checking. The host should know the rules. */ memcpy(&ll_random_address, params, sizeof(struct hciLeSetRandomAddress)); return HCI_SUCCESS; } uint8_t ll_set_scan_params(uint8_t *params) { if (ll_state == SCANNING) return HCI_ERR_Controller_Busy; memcpy(&ll_scan_params, params, sizeof(struct hciLeSetScanParams)); return HCI_SUCCESS; } uint8_t ll_set_advertising_params(uint8_t *params) { if (ll_state == ADVERTISING) return HCI_ERR_Controller_Busy; memcpy(&ll_adv_params, params, sizeof(struct hciLeSetAdvParams)); switch (ll_adv_params.advType) { case BLE_ADV_HEADER_PDU_TYPE_ADV_NONCONN_IND: case BLE_ADV_HEADER_PDU_TYPE_ADV_SCAN_IND: if (ll_adv_params.advIntervalMin < (100000 / LL_ADV_INTERVAL_UNIT_US)) /* 100ms */ return HCI_ERR_Invalid_HCI_Command_Parameters; /* Fall through */ case BLE_ADV_HEADER_PDU_TYPE_ADV_IND: if (ll_adv_params.advIntervalMin > ll_adv_params.advIntervalMax) return HCI_ERR_Invalid_HCI_Command_Parameters; if (ll_adv_params.advIntervalMin < (20000 / LL_ADV_INTERVAL_UNIT_US) || /* 20ms */ ll_adv_params.advIntervalMax > (10240000 / LL_ADV_INTERVAL_UNIT_US)) /* 10.24s */ return HCI_ERR_Invalid_HCI_Command_Parameters; ll_adv_interval_us = (((ll_adv_params.advIntervalMin + ll_adv_params.advIntervalMax) / 2) * LL_ADV_INTERVAL_UNIT_US); /* Don't time out */ ll_adv_timeout_us = -1; break; case BLE_ADV_HEADER_PDU_TYPE_ADV_DIRECT_IND: ll_adv_interval_us = LL_ADV_DIRECT_INTERVAL_US; ll_adv_timeout_us = LL_ADV_DIRECT_TIMEOUT_US; break; default: return HCI_ERR_Invalid_HCI_Command_Parameters; } /* Initialize the ADV PDU */ ll_adv_pdu.header_type_adv = 1; ll_adv_pdu.header.adv.type = ll_adv_params.advType; ll_adv_pdu.header.adv.txaddr = ll_adv_params.useRandomAddress; if (ll_adv_params.useRandomAddress) memcpy(ll_adv_pdu.payload, &ll_random_address, BLUETOOTH_ADDR_OCTETS); else memcpy(ll_adv_pdu.payload, &ll_public_address, BLUETOOTH_ADDR_OCTETS); if (ll_adv_params.advType == BLE_ADV_HEADER_PDU_TYPE_ADV_DIRECT_IND) { ll_adv_pdu.header.adv.rxaddr = ll_adv_params.directRandomAddress; memcpy(&ll_adv_pdu.payload[BLUETOOTH_ADDR_OCTETS], ll_adv_params.directAddr, sizeof(ll_adv_params.directAddr)); ll_adv_pdu.header.adv.length = 12; } else { ll_adv_pdu.header.adv.rxaddr = 0; } /* All other types get data from SetAdvertisingData */ /* Initialize the Scan Rsp PDU */ ll_scan_rsp_pdu.header_type_adv = 1; ll_scan_rsp_pdu.header.adv.type = BLE_ADV_HEADER_PDU_TYPE_SCAN_RSP; ll_scan_rsp_pdu.header.adv.txaddr = ll_adv_params.useRandomAddress; if (ll_adv_params.useRandomAddress) memcpy(ll_scan_rsp_pdu.payload, &ll_random_address, BLUETOOTH_ADDR_OCTETS); else memcpy(ll_scan_rsp_pdu.payload, &ll_public_address, BLUETOOTH_ADDR_OCTETS); ll_scan_rsp_pdu.header.adv.rxaddr = 0; return HCI_SUCCESS; } static uint32_t tx_end, rsp_end, tx_rsp_end; struct ble_pdu ll_rcv_packet; /** * Advertises packet that has already been generated on given channel. * * This function also processes any incoming scan requests. * * @param chan The channel on which to advertise. * @returns EC_SUCCESS on packet reception, otherwise error. */ int ble_ll_adv(int chan) { int rv; ble_radio_init(BLE_ADV_ACCESS_ADDRESS, BLE_ADV_CRCINIT); /* Change channel */ NRF51_RADIO_FREQUENCY = NRF51_RADIO_FREQUENCY_VAL(chan2freq(chan)); NRF51_RADIO_DATAWHITEIV = chan; ble_tx(&ll_adv_pdu); while (!RADIO_DONE) ; tx_end = get_time().le.lo; if (ll_adv_pdu.header.adv.type == BLE_ADV_HEADER_PDU_TYPE_ADV_NONCONN_IND) return EC_SUCCESS; rv = ble_rx(&ll_rcv_packet, 16000, 1); if (rv != EC_SUCCESS) return rv; while (!RADIO_DONE) ; tx_rsp_end = get_time().le.lo; /* Check for valid responses */ switch (ll_rcv_packet.header.adv.type) { case BLE_ADV_HEADER_PDU_TYPE_SCAN_REQ: /* Scan requests are only allowed for ADV_IND and SCAN_IND */ if ((ll_adv_pdu.header.adv.type != BLE_ADV_HEADER_PDU_TYPE_ADV_IND && ll_adv_pdu.header.adv.type != BLE_ADV_HEADER_PDU_TYPE_ADV_SCAN_IND) || /* The advertising address needs to match */ (memcmp(&ll_rcv_packet.payload[BLUETOOTH_ADDR_OCTETS], &ll_adv_pdu.payload[0], BLUETOOTH_ADDR_OCTETS))) { /* Don't send the scan response */ radio_disable(); return rv; } break; case BLE_ADV_HEADER_PDU_TYPE_CONNECT_REQ: /* Don't send a scan response */ radio_disable(); /* Connecting is only allowed for ADV_IND and ADV_DIRECT_IND */ if (ll_adv_pdu.header.adv.type != BLE_ADV_HEADER_PDU_TYPE_ADV_IND && ll_adv_pdu.header.adv.type != BLE_ADV_HEADER_PDU_TYPE_ADV_DIRECT_IND) return rv; /* The advertising address needs to match */ if (memcmp(&ll_rcv_packet.payload[BLUETOOTH_ADDR_OCTETS], &ll_adv_pdu.payload[0], BLUETOOTH_ADDR_OCTETS)) return rv; /* The InitAddr address needs to match for ADV_DIRECT_IND */ if (ll_adv_pdu.header.adv.type == BLE_ADV_HEADER_PDU_TYPE_ADV_DIRECT_IND && memcmp(&ll_adv_pdu.payload[BLUETOOTH_ADDR_OCTETS], &ll_rcv_packet.payload[0], BLUETOOTH_ADDR_OCTETS)) return rv; /* Mark time that connect was received */ time_of_connect_req = NRF51_TIMER_CC(0, 1); /* * Enter connection state upon receiving * a connect request packet */ ll_state = CONNECTION; return rv; break; default: /* Unhandled response packet */ radio_disable(); return rv; break; } CPRINTF("ADV %u Response %u %u\n", tx_end, rsp_end, tx_rsp_end); return rv; } int ble_ll_adv_event(void) { int chan_idx; int rv = EC_SUCCESS; for (chan_idx = 0; chan_idx < 3; chan_idx++) { if (ll_adv_params.advChannelMap & BIT(chan_idx)) { rv = ble_ll_adv(chan_idx + 37); if (rv != EC_SUCCESS) return rv; } } return rv; } void print_connection_state(void) { CPRINTF("vvvvvvvvvvvvvvvvvvvCONNECTION STATEvvvvvvvvvvvvvvvvvvv\n"); CPRINTF("Number of connections events processed: %d\n", ll_conn_events); CPRINTF("Recovered from %d bad receives.\n", errors_recovered); CPRINTF("Access addr(hex): %x\n", conn_params.access_addr); CPRINTF("win_size(hex): %x\n", conn_params.win_size); CPRINTF("win_offset(hex): %x\n", conn_params.win_offset); CPRINTF("interval(hex): %x\n", conn_params.interval); CPRINTF("latency(hex): %x\n", conn_params.latency); CPRINTF("timeout(hex): %x\n", conn_params.timeout); CPRINTF("channel_map(hex): %lx\n", conn_params.channel_map); CPRINTF("hop(hex): %x\n", conn_params.hop_increment); CPRINTF("SCA(hex): %x\n", conn_params.sleep_clock_accuracy); CPRINTF("transmitWindowOffset: %d\n", conn_params.transmitWindowOffset); CPRINTF("connInterval: %d\n", conn_params.connInterval); CPRINTF("transmitWindowSize: %d\n", conn_params.transmitWindowSize); CPRINTF("^^^^^^^^^^^^^^^^^^^CONNECTION STATE^^^^^^^^^^^^^^^^^^^\n"); } int connected_communicate(void) { int rv; long sleep_time; int offset = 0; uint64_t listen_time; uint8_t comm_channel = get_next_data_channel(&remap_table); if (num_consecutive_failures > 0) { ble_radio_init(conn_params.access_addr, conn_params.crc_init_val); NRF51_RADIO_FREQUENCY = NRF51_RADIO_FREQUENCY_VAL(chan2freq(comm_channel)); NRF51_RADIO_DATAWHITEIV = comm_channel; listen_time = last_receive_time + conn_params.connInterval - get_time().val + conn_params.transmitWindowSize; /* * This listens for 1.25 times the expected amount * of time. This is a margin of error. This line is * only called when a connection has failed (a missed * packet). The slave and the master could have * missed this packet due to a disagreement on when * the packet should have arrived. We listen for * slightly longer than expected in the case that * there was a timing disagreement. */ rv = ble_rx(&ll_rcv_packet, listen_time + (listen_time >> 2), 0); } else { if (!is_first_data_packet) { sleep_time = receive_time + conn_params.connInterval - get_time().val; /* * The time slept is 31/32 (96.875%) of the calculated * required sleep time because the code to receive * packets requires time to set up. */ usleep(sleep_time - (sleep_time >> 5)); } else { last_receive_time = time_of_connect_req; sleep_time = TRANSMIT_WINDOW_OFFSET_CONSTANT + conn_params.transmitWindowOffset + time_of_connect_req - get_time().val; if (sleep_time >= 0) { /* * Radio is on for longer than needed for first * packet to make sure that it is received. */ usleep(sleep_time - (sleep_time >> 2)); } else { return EC_ERROR_TIMEOUT; } } ble_radio_init(conn_params.access_addr, conn_params.crc_init_val); NRF51_RADIO_FREQUENCY = NRF51_RADIO_FREQUENCY_VAL(chan2freq(comm_channel)); NRF51_RADIO_DATAWHITEIV = comm_channel; /* * Timing the transmit window is very hard to do when the code * executing has actual effect on the timing. To combat this, * the radio starts a little early, and terminates when the * window normally should. The variable 'offset' represents * how early the window opens in microseconds. */ if (!is_first_data_packet) offset = last_receive_time + conn_params.connInterval - get_time().val; else offset = 0; rv = ble_rx(&ll_rcv_packet, offset + conn_params.transmitWindowSize, 0); } /* * The radio shortcuts have been set up so that transmission * occurs automatically after receiving. The radio just needs * to know where to find the packet to be sent. */ NRF51_RADIO_PACKETPTR = (uint32_t)packet_tb_sent; receive_time = NRF51_TIMER_CC(0, 1); if (rv != EC_SUCCESS) receive_time = last_receive_time + conn_params.connInterval; while (!RADIO_DONE) ; last_receive_time = receive_time; is_first_data_packet = 0; return rv; } static uint32_t ll_adv_events; static timestamp_t deadline; static uint32_t start, end; void bluetooth_ll_task(void) { uint64_t last_rx_time = 0; CPRINTS("LL task init"); while (1) { switch (ll_state) { case ADVERTISING: if (deadline.val == 0) { CPRINTS("ADV @%p", &ll_adv_pdu); deadline.val = get_time().val + (uint32_t)ll_adv_timeout_us; ll_adv_events = 0; } ble_ll_adv_event(); ll_adv_events++; if (ll_state == CONNECTION) { receive_time = 0; break; } /* sleep for 0-10ms */ usleep(ll_adv_interval_us + ll_pseudo_rand(10000)); if (get_time().val > deadline.val) { ll_state = STANDBY; break; } break; case STANDBY: deadline.val = 0; CPRINTS("Standby %d events", ll_adv_events); ll_adv_events = 0; ll_conn_events = 0; task_wait_event(-1); connection_initialized = 0; errors_recovered = 0; break; case TEST_RX: if (ble_test_rx() == HCI_SUCCESS) ll_test_packets++; /* Packets come every 625us, sleep to save power */ usleep(300); break; case TEST_TX: start = get_time().le.lo; ble_test_tx(); ll_test_packets++; end = get_time().le.lo; usleep(625 - 82 - (end-start)); /* 625us */ break; case UNINITIALIZED: ble_radio_init(BLE_ADV_ACCESS_ADDRESS, BLE_ADV_CRCINIT); ll_adv_events = 0; task_wait_event(-1); connection_initialized = 0; packet_tb_sent = &tx_packet_1; set_empty_data_packet(&tx_packet_1); break; case CONNECTION: if (!connection_initialized) { if (initialize_connection() != HCI_SUCCESS) { ll_state = STANDBY; break; } connection_initialized = 1; last_rx_time = NRF51_TIMER_CC(0, 1); } if (connected_communicate() == EC_SUCCESS) { if (num_consecutive_failures > 0) ++errors_recovered; num_consecutive_failures = 0; last_rx_time = get_time().val; } else { num_consecutive_failures++; if ((get_time().val - last_rx_time) > conn_params.connSupervisionTimeout) { ll_state = STANDBY; CPRINTF("EXITING CONNECTION STATE " "DUE TO TIMEOUT.\n"); } } ++ll_conn_events; if (ll_state == STANDBY) { CPRINTF("Exiting connection state/Entering " "Standby state after %d connections ", "events\n", ll_conn_events); print_connection_state(); } break; default: CPRINTS("Unhandled State ll_state = %d", ll_state); ll_state = UNINITIALIZED; task_wait_event(-1); } } }