kopia lustrzana https://github.com/weetmuts/wmbusmeters
664 wiersze
20 KiB
C++
664 wiersze
20 KiB
C++
/*
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Copyright (C) 2018-2020 Fredrik Öhrström
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include"wmbus.h"
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#include"wmbus_utils.h"
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#include"wmbus_amb8465.h"
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#include"serial.h"
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#include<assert.h>
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#include<pthread.h>
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#include<semaphore.h>
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#include<errno.h>
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#include<unistd.h>
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#include<sys/time.h>
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#include<time.h>
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using namespace std;
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struct WMBusAmber : public virtual WMBusCommonImplementation
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{
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bool ping();
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uint32_t getDeviceId();
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LinkModeSet getLinkModes();
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void setLinkModes(LinkModeSet lms);
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LinkModeSet supportedLinkModes()
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{
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return
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C1_bit |
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S1_bit |
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S1m_bit |
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T1_bit;
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}
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int numConcurrentLinkModes() { return 1; }
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bool canSetLinkModes(LinkModeSet desired_modes)
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{
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if (0 == countSetBits(desired_modes.bits())) return false;
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// Simple check first, are they all supported?
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if (!supportedLinkModes().supports(desired_modes)) return false;
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// So far so good, is the desired combination supported?
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// If only a single bit is desired, then it is supported.
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if (1 == countSetBits(desired_modes.bits())) return true;
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// More than 2 listening modes at the same time will always fail.
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if (2 != countSetBits(desired_modes.bits())) return false;
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// C1 and T1 can be listened to at the same time!
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if (desired_modes.has(LinkMode::C1) && desired_modes.has(LinkMode::T1)) return true;
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// Likewise for S1 and S1-m
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if (desired_modes.has(LinkMode::S1) || desired_modes.has(LinkMode::S1m)) return true;
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// Any other combination is forbidden.
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return false;
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}
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void processSerialData();
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void getConfiguration();
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SerialDevice *serial() { return serial_.get(); }
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void simulate() { }
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bool reset();
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WMBusAmber(unique_ptr<SerialDevice> serial, SerialCommunicationManager *manager);
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~WMBusAmber() { }
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private:
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unique_ptr<SerialDevice> serial_;
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SerialCommunicationManager *manager_ {};
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vector<uchar> read_buffer_;
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pthread_mutex_t command_lock_ = PTHREAD_MUTEX_INITIALIZER;
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sem_t command_wait_ {};
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int sent_command_ {};
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int received_command_ {};
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LinkModeSet link_modes_ {};
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vector<uchar> received_payload_;
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bool rssi_expected_ {};
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struct timeval timestamp_last_rx_ {};
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int protocol_error_count_ {};
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void waitForResponse();
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FrameStatus checkAMB8465Frame(vector<uchar> &data,
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size_t *frame_length,
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int *msgid_out,
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int *payload_len_out,
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int *payload_offset,
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uchar *rssi);
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void handleMessage(int msgid, vector<uchar> &frame);
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};
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unique_ptr<WMBus> openAMB8465(string device, SerialCommunicationManager *manager, unique_ptr<SerialDevice> serial_override)
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{
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if (serial_override)
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{
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WMBusAmber *imp = new WMBusAmber(std::move(serial_override), manager);
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return unique_ptr<WMBus>(imp);
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}
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auto serial = manager->createSerialDeviceTTY(device.c_str(), 9600);
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WMBusAmber *imp = new WMBusAmber(std::move(serial), manager);
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return unique_ptr<WMBus>(imp);
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}
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WMBusAmber::WMBusAmber(unique_ptr<SerialDevice> serial, SerialCommunicationManager *manager) :
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WMBusCommonImplementation(DEVICE_AMB8465), serial_(std::move(serial)), manager_(manager)
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{
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sem_init(&command_wait_, 0, 0);
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manager_->listenTo(serial_.get(),call(this,processSerialData));
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serial_->open(true);
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rssi_expected_ = true;
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timerclear(×tamp_last_rx_);
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}
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uchar xorChecksum(vector<uchar> msg, int len)
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{
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uchar c = 0;
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for (int i=0; i<len; ++i) {
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c ^= msg[i];
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}
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return c;
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}
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bool WMBusAmber::ping()
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{
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if (serial_->readonly()) return true; // Feeding from stdin or file.
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pthread_mutex_lock(&command_lock_);
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// Ping it...
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pthread_mutex_unlock(&command_lock_);
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return true;
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}
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uint32_t WMBusAmber::getDeviceId()
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{
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if (serial_->readonly()) { return 0; } // Feeding from stdin or file.
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pthread_mutex_lock(&command_lock_);
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vector<uchar> msg(4);
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msg[0] = AMBER_SERIAL_SOF;
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msg[1] = CMD_SERIALNO_REQ;
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msg[2] = 0; // No payload
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msg[3] = xorChecksum(msg, 3);
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assert(msg[3] == 0xf4);
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sent_command_ = CMD_SERIALNO_REQ;
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verbose("(amb8465) get device id\n");
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bool sent = serial()->send(msg);
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uint32_t id = 0;
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if (sent)
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{
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waitForResponse();
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if (received_command_ == (CMD_SERIALNO_REQ | 0x80))
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{
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id = received_payload_[4] << 24 |
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received_payload_[5] << 16 |
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received_payload_[6] << 8 |
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received_payload_[7];
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verbose("(amb8465) device id %08x\n", id);
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}
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}
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pthread_mutex_unlock(&command_lock_);
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return id;
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}
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LinkModeSet WMBusAmber::getLinkModes()
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{
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if (serial_->readonly()) { return Any_bit; } // Feeding from stdin or file.
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// It is not possible to read the volatile mode set using setLinkModeSet below.
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// (It is possible to read the non-volatile settings, but this software
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// does not change those.) So we remember the state for the device.
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getConfiguration();
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return link_modes_;
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}
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void WMBusAmber::getConfiguration()
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{
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pthread_mutex_lock(&command_lock_);
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vector<uchar> msg(6);
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msg[0] = AMBER_SERIAL_SOF;
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msg[1] = CMD_GET_REQ;
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msg[2] = 0x02;
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msg[3] = 0x00;
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msg[4] = 0x80;
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msg[5] = xorChecksum(msg, 5);
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assert(msg[5] == 0x77);
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verbose("(amb8465) get config\n");
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bool sent = serial()->send(msg);
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if (!sent)
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{
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pthread_mutex_unlock(&command_lock_);
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return;
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}
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waitForResponse();
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if (received_command_ == (0x80|CMD_GET_REQ))
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{
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// These are the non-volatile values stored inside the dongle.
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// However the link mode, radio channel etc might not be the one
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// that we are actually using! Since setting the link mode
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// is possible without changing the non-volatile memory.
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// But there seems to be no way of reading out the set link mode....???
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// Ie there is a disconnect between the flash and the actual running dongle.
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// Oh well.
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//
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// These are just some random config settings store in non-volatile memory.
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verbose("(amb8465) config: uart %02x\n", received_payload_[2]);
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verbose("(amb8465) config: IND output enabled %02x\n", received_payload_[5+2]);
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verbose("(amb8465) config: radio Channel %02x\n", received_payload_[60+2]);
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uchar re = received_payload_[69+2];
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verbose("(amb8465) config: rssi enabled %02x\n", re);
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rssi_expected_ = (re != 0) ? true : false;
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verbose("(amb8465) config: mode Preselect %02x\n", received_payload_[70+2]);
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}
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pthread_mutex_unlock(&command_lock_);
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}
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void WMBusAmber::setLinkModes(LinkModeSet lms)
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{
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if (serial_->readonly()) return; // Feeding from stdin or file.
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if (!canSetLinkModes(lms))
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{
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string modes = lms.hr();
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error("(amb8465) setting link mode(s) %s is not supported for amb8465\n", modes.c_str());
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}
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pthread_mutex_lock(&command_lock_);
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vector<uchar> msg(8);
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msg[0] = AMBER_SERIAL_SOF;
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msg[1] = CMD_SET_MODE_REQ;
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sent_command_ = msg[1];
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msg[2] = 1; // Len
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if (lms.has(LinkMode::C1) && lms.has(LinkMode::T1))
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{
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// Listening to both C1 and T1!
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msg[3] = 0x09;
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}
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else if (lms.has(LinkMode::C1))
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{
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// Listening to only C1.
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msg[3] = 0x0E;
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}
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else if (lms.has(LinkMode::T1))
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{
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// Listening to only T1.
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msg[3] = 0x08;
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}
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else if (lms.has(LinkMode::S1) || lms.has(LinkMode::S1m))
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{
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// Listening only to S1 and S1-m
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msg[3] = 0x03;
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}
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msg[4] = xorChecksum(msg, 4);
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verbose("(amb8465) set link mode %02x\n", msg[3]);
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bool sent = serial()->send(msg);
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if (sent) waitForResponse();
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link_modes_ = lms;
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pthread_mutex_unlock(&command_lock_);
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}
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void WMBusAmber::waitForResponse()
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{
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while (manager_->isRunning())
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{
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int rc = sem_wait(&command_wait_);
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if (rc==0) break;
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if (rc==-1)
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{
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if (errno==EINTR) continue;
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break;
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}
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}
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}
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FrameStatus WMBusAmber::checkAMB8465Frame(vector<uchar> &data,
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size_t *frame_length,
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int *msgid_out,
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int *payload_len_out,
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int *payload_offset,
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uchar *rssi)
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{
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if (data.size() < 2) return PartialFrame;
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debugPayload("(amb8465) checkAMB8465Frame", data);
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int payload_len = 0;
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if (data[0] == 0xff)
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{
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if (data.size() < 3)
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{
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debug("(amb8465) not enough bytes yet for command.\n");
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return PartialFrame;
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}
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// Only response from CMD_DATA_IND has rssi
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int rssi_len = (rssi_expected_ && data[1] == (0x80|CMD_DATA_IND)) ? 1 : 0;
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// A command response begins with 0xff
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*msgid_out = data[1];
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payload_len = data[2];
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*payload_len_out = payload_len;
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*payload_offset = 3;
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// FF CMD len payload [RSSI] CS
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*frame_length = 4 + payload_len + rssi_len;
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if (data.size() < *frame_length)
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{
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debug("(amb8465) not enough bytes yet, partial command response %d %d.\n", data.size(), *frame_length);
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return PartialFrame;
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}
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debug("(amb8465) received full command frame\n");
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uchar cs = xorChecksum(data, *frame_length-1);
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if (data[*frame_length-1] != cs) {
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verbose("(amb8465) checksum error %02x (should %02x)\n", data[*frame_length-1], cs);
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}
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if (rssi_len)
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{
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*rssi = data[*frame_length-2];
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signed int dbm = (*rssi >= 128) ? (*rssi - 256) / 2 - 74 : *rssi / 2 - 74;
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verbose("(amb8465) rssi %d (%d dBm)\n", *rssi, dbm);
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}
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return FullFrame;
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}
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// If it is not a 0xff we assume it is a message beginning with a length.
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// There might be a different mode where the data is wrapped in 0xff. But for the moment
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// this is what I see.
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size_t offset = 0;
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// The data[0] must be at least 10 bytes. C MM AAAA V T Ci
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// And C must be 0x44.
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while ((payload_len = data[offset]) < 10 || data[offset+1] != 0x44)
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{
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offset++;
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if (offset + 2 >= data.size()) {
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// No sensible telegram in the buffer. Flush it!
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// But not the last char, because the next char could be a 0x44
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verbose("(amb8465) no sensible telegram found, clearing buffer.\n");
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uchar last = data[data.size()-1];
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data.clear();
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data.insert(data.end(), &last, &last+1); // Re-insert the last byte.
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return PartialFrame;
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}
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}
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*msgid_out = 0; // 0 is used to signal
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*payload_len_out = payload_len;
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*payload_offset = offset+1;
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*frame_length = payload_len+offset+1;
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if (data.size() < *frame_length)
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{
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debug("(amb8465) not enough bytes yet, partial frame %d %d.\n", data.size(), *frame_length);
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return PartialFrame;
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}
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if (offset > 0)
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{
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verbose("(amb8465) out of sync, skipping %d bytes.\n", offset);
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}
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debug("(amb8465) received full frame\n");
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if (rssi_expected_)
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{
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*rssi = data[*frame_length-1];
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signed int dbm = (*rssi >= 128) ? (*rssi - 256) / 2 - 74 : *rssi / 2 - 74;
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verbose("(amb8465) rssi %d (%d dBm)\n", *rssi, dbm);
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}
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return FullFrame;
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}
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void WMBusAmber::processSerialData()
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{
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vector<uchar> data;
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// Receive and accumulated serial data until a full frame has been received.
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serial_->receive(&data);
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struct timeval timestamp;
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// Check long delay beetween rx chunks
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gettimeofday(×tamp, NULL);
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if (read_buffer_.size() > 0 && timerisset(×tamp_last_rx_)) {
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struct timeval chunk_time;
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timersub(×tamp, ×tamp_last_rx_, &chunk_time);
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if (chunk_time.tv_sec >= 2) {
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verbose("(amb8465) rx long delay (%lds), drop incomplete telegram\n", chunk_time.tv_sec);
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read_buffer_.clear();
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if (++protocol_error_count_ >= 20)
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{
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error("(amb8465) to many protocol errors.\n");
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}
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}
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else
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{
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unsigned long chunk_time_ms = 1000 * chunk_time.tv_sec + chunk_time.tv_usec / 1000;
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debug("(amb8465) chunk time %ld msec\n", chunk_time_ms);
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}
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}
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read_buffer_.insert(read_buffer_.end(), data.begin(), data.end());
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size_t frame_length;
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int msgid;
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int payload_len, payload_offset;
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uchar rssi;
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for (;;)
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{
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FrameStatus status = checkAMB8465Frame(read_buffer_, &frame_length, &msgid, &payload_len, &payload_offset, &rssi);
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if (status == PartialFrame)
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{
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if (read_buffer_.size() > 0) {
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// Save timestamp of this chunk
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timestamp_last_rx_ = timestamp;
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}
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else
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{
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// Clean and empty
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timerclear(×tamp_last_rx_);
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}
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break;
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}
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if (status == ErrorInFrame)
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{
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verbose("(amb8465) protocol error in message received!\n");
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string msg = bin2hex(read_buffer_);
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debug("(amb8465) protocol error \"%s\"\n", msg.c_str());
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read_buffer_.clear();
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if (++protocol_error_count_ >= 20)
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{
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error("(amb8465) to many protocol errors.\n");
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}
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break;
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}
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if (status == FullFrame)
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{
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vector<uchar> payload;
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if (payload_len > 0)
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{
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uchar l = payload_len;
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payload.insert(payload.end(), &l, &l+1); // Re-insert the len byte.
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payload.insert(payload.end(), read_buffer_.begin()+payload_offset, read_buffer_.begin()+payload_offset+payload_len);
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}
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read_buffer_.erase(read_buffer_.begin(), read_buffer_.begin()+frame_length);
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handleMessage(msgid, payload);
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}
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}
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}
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void WMBusAmber::handleMessage(int msgid, vector<uchar> &frame)
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{
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switch (msgid) {
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case (0):
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{
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handleTelegram(frame);
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break;
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}
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case (0x80|CMD_SET_MODE_REQ):
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{
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verbose("(amb8465) set link mode completed\n");
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received_command_ = msgid;
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received_payload_.clear();
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received_payload_.insert(received_payload_.end(), frame.begin(), frame.end());
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debugPayload("(amb8465) set link mode response", received_payload_);
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sem_post(&command_wait_);
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break;
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}
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case (0x80|CMD_GET_REQ):
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{
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verbose("(amb8465) get config completed\n");
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received_command_ = msgid;
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received_payload_.clear();
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received_payload_.insert(received_payload_.end(), frame.begin(), frame.end());
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debugPayload("(amb8465) get config response", received_payload_);
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sem_post(&command_wait_);
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break;
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}
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case (0x80|CMD_SERIALNO_REQ):
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{
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verbose("(amb8465) get device id completed\n");
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received_command_ = msgid;
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received_payload_.clear();
|
|
received_payload_.insert(received_payload_.end(), frame.begin(), frame.end());
|
|
debugPayload("(amb8465) get device id response", received_payload_);
|
|
sem_post(&command_wait_);
|
|
break;
|
|
}
|
|
default:
|
|
verbose("(amb8465) unhandled device message %d\n", msgid);
|
|
received_payload_.clear();
|
|
received_payload_.insert(received_payload_.end(), frame.begin(), frame.end());
|
|
debugPayload("(amb8465) unknown response", received_payload_);
|
|
}
|
|
}
|
|
|
|
bool WMBusAmber::reset()
|
|
{
|
|
serial_->close();
|
|
bool rc = serial_->reopen();
|
|
if (!rc) return false;
|
|
getConfiguration();
|
|
setLinkModes(link_modes_);
|
|
return true;
|
|
}
|
|
|
|
AccessCheck detectAMB8465(string device, SerialCommunicationManager *manager)
|
|
{
|
|
// Talk to the device and expect a very specific answer.
|
|
auto serial = manager->createSerialDeviceTTY(device.c_str(), 9600);
|
|
AccessCheck rc = serial->open(false);
|
|
if (rc != AccessCheck::AccessOK) return AccessCheck::NotThere;
|
|
|
|
vector<uchar> data;
|
|
// First clear out any data in the queue.
|
|
serial->receive(&data);
|
|
data.clear();
|
|
|
|
vector<uchar> msg(4);
|
|
msg[0] = AMBER_SERIAL_SOF;
|
|
msg[1] = CMD_SERIALNO_REQ;
|
|
msg[2] = 0; // No payload
|
|
msg[3] = xorChecksum(msg, 3);
|
|
|
|
assert(msg[3] == 0xf4);
|
|
|
|
verbose("(amb8465) are you there?\n");
|
|
serial->send(msg);
|
|
// Wait for 100ms so that the USB stick have time to prepare a response.
|
|
usleep(1000*100);
|
|
serial->receive(&data);
|
|
int limit = 0;
|
|
while (data.size() > 8 && data[0] != 0xff) {
|
|
// Eat bytes until a 0xff appears to get in sync with the proper response.
|
|
// Extraneous bytes might be due to a partially read telegram.
|
|
data.erase(data.begin());
|
|
vector<uchar> more;
|
|
serial->receive(&more);
|
|
if (more.size() > 0) {
|
|
data.insert(data.end(), more.begin(), more.end());
|
|
}
|
|
if (limit++ > 100) break; // Do not wait too long.
|
|
}
|
|
|
|
serial->close();
|
|
|
|
if (data.size() < 8 ||
|
|
data[0] != 0xff ||
|
|
data[1] != (0x80 | msg[1]) ||
|
|
data[2] != 0x04 ||
|
|
data[7] != xorChecksum(data, 7)) {
|
|
return AccessCheck::NotThere;
|
|
}
|
|
return AccessCheck::AccessOK;
|
|
}
|
|
|
|
static AccessCheck tryFactoryResetAMB8465(string device, SerialCommunicationManager *manager, int baud)
|
|
{
|
|
// Talk to the device and expect a very specific answer.
|
|
auto serial = manager->createSerialDeviceTTY(device.c_str(), baud);
|
|
AccessCheck rc = serial->open(false);
|
|
if (rc != AccessCheck::AccessOK) {
|
|
verbose("(amb8465) could not open device %s using baud %d\n", device.c_str(), baud);
|
|
return AccessCheck::NotThere;
|
|
}
|
|
|
|
vector<uchar> data;
|
|
// First clear out any data in the queue.
|
|
serial->receive(&data);
|
|
data.clear();
|
|
|
|
vector<uchar> msg(4);
|
|
msg[0] = AMBER_SERIAL_SOF;
|
|
msg[1] = CMD_FACTORYRESET_REQ;
|
|
msg[2] = 0; // No payload
|
|
msg[3] = xorChecksum(msg, 3);
|
|
|
|
assert(msg[3] == 0xee);
|
|
|
|
verbose("(amb8465) try factory reset %s using baud %d\n", device.c_str(), baud);
|
|
serial->send(msg);
|
|
// Wait for 100ms so that the USB stick have time to prepare a response.
|
|
usleep(1000*100);
|
|
serial->receive(&data);
|
|
int limit = 0;
|
|
while (data.size() > 8 && data[0] != 0xff)
|
|
{
|
|
// Eat bytes until a 0xff appears to get in sync with the proper response.
|
|
// Extraneous bytes might be due to a partially read telegram.
|
|
data.erase(data.begin());
|
|
vector<uchar> more;
|
|
serial->receive(&more);
|
|
if (more.size() > 0) {
|
|
data.insert(data.end(), more.begin(), more.end());
|
|
}
|
|
if (limit++ > 100) break; // Do not wait too long.
|
|
}
|
|
|
|
serial->close();
|
|
|
|
debugPayload("(amb8465) reset response", data);
|
|
|
|
if (data.size() < 8 ||
|
|
data[0] != 0xff ||
|
|
data[1] != 0x90 ||
|
|
data[2] != 0x01 ||
|
|
data[3] != 0x00 || // Status should be 0.
|
|
data[4] != xorChecksum(data, 4))
|
|
{
|
|
verbose("(amb8465) no response to factory reset %s using baud %d\n", device.c_str(), baud);
|
|
return AccessCheck::NotThere;
|
|
}
|
|
verbose("(amb8465) received proper factory reset response %s using baud %d\n", device.c_str(), baud);
|
|
return AccessCheck::AccessOK;
|
|
}
|
|
|
|
int bauds[] = { 1200, 2400, 4800, 9600, 19200, 38400, 56000, 115200, 0 };
|
|
|
|
AccessCheck factoryResetAMB8465(string device, SerialCommunicationManager *manager, int *was_baud)
|
|
{
|
|
AccessCheck rc = AccessCheck::NotThere;
|
|
|
|
for (int i=0; bauds[i] != 0; ++i)
|
|
{
|
|
rc = tryFactoryResetAMB8465(device, manager, bauds[i]);
|
|
if (rc == AccessCheck::AccessOK)
|
|
{
|
|
*was_baud = bauds[i];
|
|
return AccessCheck::AccessOK;
|
|
}
|
|
}
|
|
*was_baud = 0;
|
|
return AccessCheck::NotThere;
|
|
}
|