PX4-Autopilot/src/drivers/uavcan/actuators/esc.cpp

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/**
 * @file esc.cpp
 *
 * @author Pavel Kirienko <pavel.kirienko@gmail.com>
 */

#include "esc.hpp"
#include <systemlib/err.h>
#include <parameters/param.h>
#include <drivers/drv_hrt.h>
#include <lib/atmosphere/atmosphere.h>

using namespace time_literals;

UavcanEscController::UavcanEscController(uavcan::INode &node) :
	_node(node),
	_uavcan_pub_raw_cmd(node),
	_uavcan_sub_status(node)
{
	_uavcan_pub_raw_cmd.setPriority(uavcan::TransferPriority::NumericallyMin); // Highest priority
}

int
UavcanEscController::init()
{
	// ESC status subscription
	int res = _uavcan_sub_status.start(StatusCbBinder(this, &UavcanEscController::esc_status_sub_cb));

	if (res < 0) {
		PX4_ERR("ESC status sub failed %i", res);
		return res;
	}

	_esc_status_pub.advertise();

	int32_t iface_mask{0xFF};

	if (param_get(param_find("UAVCAN_ESC_IFACE"), &iface_mask) == OK) {
		_uavcan_pub_raw_cmd.getTransferSender().setIfaceMask(iface_mask);
	}

	_initialized = true;

	return res;
}

void
UavcanEscController::update_outputs(uint16_t outputs[MAX_ACTUATORS], uint8_t output_array_size)
{
	// TODO: configurable rate limit
	const auto timestamp = _node.getMonotonicTime();

	if ((timestamp - _prev_cmd_pub).toUSec() < (1000000 / MAX_RATE_HZ)) {
		return;
	}

	_prev_cmd_pub = timestamp;

	uavcan::equipment::esc::RawCommand msg = {};

	for (unsigned i = 0; i < output_array_size; i++) {
		msg.cmd.push_back(static_cast<int>(outputs[i]));
	}

	_uavcan_pub_raw_cmd.broadcast(msg);
}

void
UavcanEscController::set_rotor_count(uint8_t count)
{
	_rotor_count = count;
}

void
UavcanEscController::esc_status_sub_cb(const uavcan::ReceivedDataStructure<uavcan::equipment::esc::Status> &msg)
{
	if (msg.esc_index < esc_status_s::CONNECTED_ESC_MAX) {
		auto &ref = _esc_status.esc[msg.esc_index];

		ref.timestamp       = hrt_absolute_time();
		ref.esc_address = msg.getSrcNodeID().get();
		ref.esc_voltage     = msg.voltage;
		ref.esc_current     = msg.current;
		ref.esc_temperature = msg.temperature + atmosphere::kAbsoluteNullCelsius; // Kelvin to Celsius
		ref.esc_rpm         = msg.rpm;
		ref.esc_errorcount  = msg.error_count;

		_esc_status.esc_count = _rotor_count;
		_esc_status.counter += 1;
		_esc_status.esc_connectiontype = esc_status_s::ESC_CONNECTION_TYPE_CAN;
		_esc_status.esc_online_flags = check_escs_status();
		_esc_status.esc_armed_flags = (1 << _rotor_count) - 1;
		_esc_status.timestamp = hrt_absolute_time();
		_esc_status_pub.publish(_esc_status);
	}

	// Register device capability for each ESC channel
	if (_node_info_publisher != nullptr) {
		uint8_t node_id = msg.getSrcNodeID().get();
		uint32_t device_id = msg.esc_index;
		_node_info_publisher->registerDeviceCapability(node_id, device_id, NodeInfoPublisher::DeviceCapability::ESC);
	}
}

uint8_t
UavcanEscController::check_escs_status()
{
	int esc_status_flags = 0;
	const hrt_abstime now = hrt_absolute_time();

	for (int index = 0; index < esc_status_s::CONNECTED_ESC_MAX; index++) {

		if (_esc_status.esc[index].timestamp > 0 && now - _esc_status.esc[index].timestamp < 1200_ms) {
			esc_status_flags |= (1 << index);
		}

	}

	return esc_status_flags;
}