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// SPDX-License-Identifier: Apache-2.0
#include "hvac-can-helper.hpp"
#include <iostream>
#include <iomanip>
#include <sstream>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/ini_parser.hpp>
#include <boost/property_tree/ini_parser.hpp>
namespace property_tree = boost::property_tree;
HvacCanHelper::HvacCanHelper() :
m_temp_left(21),
m_temp_right(21),
m_fan_speed(0),
m_port("can0"),
m_config_valid(false),
m_active(false),
m_verbose(0)
{
read_config();
can_open();
}
HvacCanHelper::~HvacCanHelper()
{
can_close();
}
void HvacCanHelper::read_config()
{
// Using a separate configuration file now, it may make sense
// to revisit this if a workable scheme to handle overriding
// values for the full demo setup can be come up with.
std::string config("/etc/xdg/AGL/agl-service-hvac-can.conf");
char *home = getenv("XDG_CONFIG_HOME");
if (home) {
config = home;
config += "/AGL/agl-service-hvac.conf";
}
std::cout << "Using configuration " << config << std::endl;
property_tree::ptree pt;
try {
property_tree::ini_parser::read_ini(config, pt);
}
catch (std::exception &ex) {
// Continue with defaults if file missing/broken
std::cerr << "Could not read " << config << std::endl;
m_config_valid = true;
return;
}
const property_tree::ptree &settings =
pt.get_child("can", property_tree::ptree());
m_port = settings.get("port", "can0");
std::stringstream ss;
ss << m_port;
ss >> std::quoted(m_port);
if (m_port.empty()) {
std::cerr << "Invalid CAN port path" << std::endl;
return;
}
m_verbose = 0;
std::string verbose = settings.get("verbose", "");
std::stringstream().swap(ss);
ss << verbose;
ss >> std::quoted(verbose);
if (!verbose.empty()) {
if (verbose == "true" || verbose == "1")
m_verbose = 1;
if (verbose == "2")
m_verbose = 2;
}
m_config_valid = true;
}
void HvacCanHelper::can_open()
{
if (!m_config_valid)
return;
if (m_verbose > 1)
std::cout << "HvacCanHelper::HvacCanHelper: using port " << m_port << std::endl;
// Open raw CAN socket
m_can_socket = socket(PF_CAN, SOCK_RAW, CAN_RAW);
if (m_can_socket < 0) {
return;
}
// Look up port address
struct ifreq ifr;
strcpy(ifr.ifr_name, m_port.c_str());
if (ioctl(m_can_socket, SIOCGIFINDEX, &ifr) < 0) {
close(m_can_socket);
return;
}
m_can_addr.can_family = AF_CAN;
m_can_addr.can_ifindex = ifr.ifr_ifindex;
if (bind(m_can_socket, (struct sockaddr*) &m_can_addr, sizeof(m_can_addr)) < 0) {
close(m_can_socket);
return;
}
m_active = true;
if (m_verbose > 1)
std::cout << "HvacCanHelper::HvacCanHelper: opened " << m_port << std::endl;
}
void HvacCanHelper::can_close()
{
if (m_active)
close(m_can_socket);
}
void HvacCanHelper::set_left_temperature(uint8_t temp)
{
m_temp_left = temp;
can_update();
}
void HvacCanHelper::set_right_temperature(uint8_t temp)
{
m_temp_right = temp;
can_update();
}
void HvacCanHelper::set_fan_speed(uint8_t speed)
{
// Scale incoming 0-100 VSS signal to 0-255 to match hardware expectations
double value = speed * 255.0 / 100.0;
m_fan_speed = (uint8_t) (value + 0.5);
can_update();
}
void HvacCanHelper::can_update()
{
if (!m_active)
return;
struct can_frame frame;
frame.can_id = 0x30;
frame.can_dlc = 8;
frame.data[0] = convert_temp(m_temp_left);
frame.data[1] = convert_temp(m_temp_right);
frame.data[2] = convert_temp((uint8_t) (((int) m_temp_left + (int) m_temp_right) >> 1));
frame.data[3] = 0xF0;
frame.data[4] = m_fan_speed;
frame.data[5] = 1;
frame.data[6] = 0;
frame.data[7] = 0;
auto written = sendto(m_can_socket,
&frame,
sizeof(struct can_frame),
0,
(struct sockaddr*) &m_can_addr,
sizeof(m_can_addr));
if (written < 0) {
std::cerr << "Write to " << m_port << " failed!" << std::endl;
close(m_can_socket);
m_active = false;
}
}
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