Thomas Ales [M S E]
416 lines
12 KiB
Python
416 lines
12 KiB
Python
"""
|
|
Helios Laser System Driver
|
|
Basic implementation for controlling the Helios pulsed laser.
|
|
"""
|
|
|
|
import serial
|
|
import time
|
|
import logging
|
|
from typing import Optional, List
|
|
from enum import Enum
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class PulseMode(Enum):
|
|
"""Helios pulse mode enumeration"""
|
|
SINGLE_PULSE = 0
|
|
CONTINUOUS_GATING = 1
|
|
CONTINUOUS_PULSING = 2
|
|
|
|
|
|
class HeliosLaser:
|
|
"""
|
|
Driver for Helios pulsed laser system.
|
|
|
|
Communication: RS-232, 9600 baud, 8N1
|
|
Commands are ASCII strings terminated with CR
|
|
"""
|
|
|
|
def __init__(self, port: str = None, timeout: float = 1.0):
|
|
"""
|
|
Initialize Helios laser driver.
|
|
|
|
Args:
|
|
port: Serial port (e.g., '/dev/ttyUSB0' or 'COM5')
|
|
timeout: Serial timeout in seconds
|
|
"""
|
|
self.port = port
|
|
self.timeout = timeout
|
|
self.serial = None
|
|
self.is_connected = False
|
|
|
|
@staticmethod
|
|
def list_available_ports() -> List[str]:
|
|
"""List available serial ports"""
|
|
import serial.tools.list_ports
|
|
ports = serial.tools.list_ports.comports()
|
|
return [port.device for port in ports]
|
|
|
|
def connect(self, port: str = None) -> bool:
|
|
"""
|
|
Connect to the Helios laser.
|
|
|
|
Args:
|
|
port: Serial port (uses stored port if None)
|
|
|
|
Returns:
|
|
True if connection successful
|
|
"""
|
|
if port:
|
|
self.port = port
|
|
|
|
if not self.port:
|
|
logger.error("No port specified")
|
|
return False
|
|
|
|
try:
|
|
self.serial = serial.Serial(
|
|
port=self.port,
|
|
baudrate=9600,
|
|
bytesize=serial.EIGHTBITS,
|
|
parity=serial.PARITY_NONE,
|
|
stopbits=serial.STOPBITS_ONE,
|
|
timeout=self.timeout
|
|
)
|
|
time.sleep(0.1) # Allow time for connection to stabilize
|
|
self.is_connected = True
|
|
logger.info(f"Connected to Helios laser on {self.port}")
|
|
return True
|
|
|
|
except Exception as e:
|
|
logger.error(f"Failed to connect to Helios laser: {e}")
|
|
self.is_connected = False
|
|
return False
|
|
|
|
def disconnect(self):
|
|
"""Disconnect from the laser"""
|
|
if self.serial and self.serial.is_open:
|
|
try:
|
|
# Disable laser before disconnecting
|
|
self.set_laser_enable(False)
|
|
self.serial.close()
|
|
logger.info("Disconnected from Helios laser")
|
|
except Exception as e:
|
|
logger.error(f"Error during disconnect: {e}")
|
|
|
|
self.is_connected = False
|
|
self.serial = None
|
|
|
|
def _send_command(self, command: str) -> bool:
|
|
"""
|
|
Send a command to the laser.
|
|
|
|
Args:
|
|
command: ASCII command string (without CR)
|
|
|
|
Returns:
|
|
True if sent successfully
|
|
"""
|
|
if not self.is_connected or not self.serial:
|
|
logger.error("Not connected to laser")
|
|
return False
|
|
|
|
try:
|
|
cmd_bytes = (command + '\r').encode('ascii')
|
|
self.serial.write(cmd_bytes)
|
|
logger.debug(f"Sent command: {command}")
|
|
return True
|
|
|
|
except Exception as e:
|
|
logger.error(f"Failed to send command '{command}': {e}")
|
|
return False
|
|
|
|
def _query(self, command: str) -> Optional[str]:
|
|
"""
|
|
Send a query and read response.
|
|
|
|
Args:
|
|
command: ASCII query command (without CR or ?)
|
|
|
|
Returns:
|
|
Response value string or None if error
|
|
"""
|
|
try:
|
|
# Clear any pending data in the buffer
|
|
self.serial.reset_input_buffer()
|
|
time.sleep(0.05)
|
|
|
|
if not self._send_command(command):
|
|
return None
|
|
|
|
time.sleep(0.2) # Give device time to respond
|
|
|
|
response = self.serial.read_until(b'\r').decode('ascii', errors='replace').strip()
|
|
logger.debug(f"Query '{command}' response: {response}")
|
|
|
|
# Helios format: "COMMAND = VALUE UNIT"
|
|
# Extract just the value part
|
|
if '=' in response:
|
|
parts = response.split('=')
|
|
if len(parts) >= 2:
|
|
value_part = parts[1].strip()
|
|
# Remove unit suffix if present (e.g., "ns", "mA", "mW")
|
|
value = value_part.split()[0]
|
|
return value
|
|
|
|
return response
|
|
|
|
except Exception as e:
|
|
logger.error(f"Failed to read response for '{command}': {e}")
|
|
return None
|
|
|
|
def set_frequency_hz(self, frequency: int) -> bool:
|
|
"""
|
|
Set laser pulse frequency in Hz.
|
|
|
|
Args:
|
|
frequency: Frequency in Hz (16700 - 125000)
|
|
|
|
Returns:
|
|
True if successful
|
|
"""
|
|
if not (16700 <= frequency <= 125000):
|
|
logger.error(f"Frequency {frequency} Hz out of range (16700-125000)")
|
|
return False
|
|
|
|
# Convert frequency to period in nanoseconds
|
|
period_ns = int(1e9 / frequency)
|
|
|
|
# Clamp to valid range (8000-60000 ns)
|
|
if not (8000 <= period_ns <= 60000):
|
|
logger.error(f"Period {period_ns} ns out of range (8000-60000)")
|
|
return False
|
|
|
|
command = f"LDF {period_ns}"
|
|
return self._send_command(command)
|
|
|
|
def set_current_ma(self, current: int) -> bool:
|
|
"""
|
|
Set pump diode current in mA.
|
|
|
|
Args:
|
|
current: Current in mA (0 - 2000 for this model)
|
|
|
|
Returns:
|
|
True if successful
|
|
"""
|
|
if not (0 <= current <= 2000):
|
|
logger.error(f"Current {current} mA out of range (0-2000)")
|
|
return False
|
|
|
|
command = f"LDS {current}"
|
|
return self._send_command(command)
|
|
|
|
def set_pulse_mode(self, mode: PulseMode) -> bool:
|
|
"""
|
|
Set pulse mode.
|
|
|
|
Args:
|
|
mode: PulseMode enumeration value
|
|
|
|
Returns:
|
|
True if successful
|
|
"""
|
|
command = f"LDG {mode.value}"
|
|
return self._send_command(command)
|
|
|
|
def set_laser_enable(self, enable: bool) -> bool:
|
|
"""
|
|
Enable or disable laser emission.
|
|
|
|
Args:
|
|
enable: True to enable, False to disable
|
|
|
|
Returns:
|
|
True if successful
|
|
"""
|
|
command = f"LDO {1 if enable else 0}"
|
|
success = self._send_command(command)
|
|
|
|
if success:
|
|
state = "enabled" if enable else "disabled"
|
|
logger.info(f"Laser {state}")
|
|
|
|
return success
|
|
|
|
def is_laser_enabled(self) -> bool:
|
|
"""
|
|
Check if laser is currently enabled.
|
|
|
|
Returns:
|
|
True if laser is enabled
|
|
"""
|
|
response = self._query("LDO")
|
|
if response:
|
|
try:
|
|
return int(response) == 1
|
|
except ValueError:
|
|
logger.error(f"Invalid response for LDO: {response}")
|
|
return False
|
|
|
|
def get_frequency_hz(self) -> Optional[int]:
|
|
"""
|
|
Get current laser frequency in Hz.
|
|
|
|
Returns:
|
|
Frequency in Hz or None if error
|
|
"""
|
|
response = self._query("LDF")
|
|
if response:
|
|
try:
|
|
period_ns = int(response)
|
|
return int(1e9 / period_ns)
|
|
except (ValueError, ZeroDivisionError):
|
|
logger.error(f"Invalid response for LDF: {response}")
|
|
return None
|
|
|
|
def get_current_ma(self) -> Optional[int]:
|
|
"""
|
|
Get current pump diode current in mA.
|
|
|
|
Returns:
|
|
Current in mA or None if error
|
|
"""
|
|
response = self._query("LDS")
|
|
if response:
|
|
try:
|
|
return int(response)
|
|
except ValueError:
|
|
logger.error(f"Invalid response for LDS: {response}")
|
|
return None
|
|
|
|
def get_power_mw(self) -> Optional[float]:
|
|
"""
|
|
Get laser output power in mW.
|
|
|
|
Returns:
|
|
Power in mW or None if error
|
|
"""
|
|
response = self._query("HMP")
|
|
if response:
|
|
try:
|
|
return float(response)
|
|
except ValueError:
|
|
logger.error(f"Invalid response for HMP: {response}")
|
|
return None
|
|
|
|
def get_controller_serial(self) -> Optional[str]:
|
|
"""
|
|
Get controller serial number.
|
|
|
|
Returns:
|
|
Serial number string or None if error
|
|
"""
|
|
return self._query("CSR")
|
|
|
|
def get_head_serial(self) -> Optional[str]:
|
|
"""
|
|
Get laser head serial number.
|
|
|
|
Returns:
|
|
Serial number string or None if error
|
|
"""
|
|
return self._query("HSR")
|
|
|
|
def get_status_registers(self) -> tuple:
|
|
"""
|
|
Query LER, LCE, and CCE status registers.
|
|
|
|
Each register is a bitmask (sum of flags). Non-zero values indicate
|
|
active faults. Reset with reset_faults().
|
|
|
|
Returns:
|
|
Tuple of (ler, lce, cce) as ints, or None for each on error.
|
|
"""
|
|
def _read_reg(cmd):
|
|
resp = self._query(cmd)
|
|
if resp is not None:
|
|
try:
|
|
return int(resp)
|
|
except ValueError:
|
|
logger.error(f"Invalid response for {cmd}: {resp}")
|
|
return None
|
|
|
|
ler = _read_reg("LER")
|
|
lce = _read_reg("LCE")
|
|
cce = _read_reg("CCE")
|
|
return (ler, lce, cce)
|
|
|
|
def reset_faults(self) -> bool:
|
|
"""
|
|
Execute the controller reset sequence to clear status registers.
|
|
|
|
Protocol-specified sequence: CCE 0 -> LCE 0 -> LER 0
|
|
|
|
Returns:
|
|
True if all three commands sent successfully
|
|
"""
|
|
ok = True
|
|
ok = self._send_command("CCE 0") and ok
|
|
time.sleep(0.1)
|
|
ok = self._send_command("LCE 0") and ok
|
|
time.sleep(0.1)
|
|
ok = self._send_command("LER 0") and ok
|
|
if ok:
|
|
logger.info("Fault reset sequence sent")
|
|
return ok
|
|
|
|
def get_remote_enable(self) -> Optional[bool]:
|
|
"""
|
|
Query the remote enable state (LRE - activates utility connector pin 8).
|
|
|
|
Returns:
|
|
True if remote enable is active, False if not, None on error
|
|
"""
|
|
response = self._query("LRE")
|
|
if response is not None:
|
|
try:
|
|
return int(response) == 1
|
|
except ValueError:
|
|
logger.error(f"Invalid response for LRE: {response}")
|
|
return None
|
|
|
|
def send_raw_command(self, command: str) -> Optional[str]:
|
|
"""
|
|
Send a raw command string and return the raw response.
|
|
|
|
Useful for diagnostics. Sends *command* + CR, waits briefly,
|
|
then reads whatever the device returns (up to the first CR or timeout).
|
|
|
|
Returns:
|
|
Raw response string (decoded, stripped) or None on error.
|
|
"""
|
|
if not self.is_connected or not self.serial:
|
|
logger.error("Not connected to laser")
|
|
return None
|
|
try:
|
|
self.serial.reset_input_buffer()
|
|
time.sleep(0.05)
|
|
self.serial.write((command + '\r').encode('ascii'))
|
|
time.sleep(0.3)
|
|
raw = self.serial.read_until(b'\r')
|
|
if not raw:
|
|
raw = self.serial.read(self.serial.in_waiting)
|
|
return raw.decode('ascii', errors='replace').strip()
|
|
except Exception as e:
|
|
logger.error(f"send_raw_command error: {e}")
|
|
return None
|
|
|
|
def set_remote_enable(self, enable: bool) -> bool:
|
|
"""
|
|
Set the remote enable state (LRE - utility connector pin 8).
|
|
|
|
Args:
|
|
enable: True to activate remote enable, False to deactivate
|
|
|
|
Returns:
|
|
True if successful
|
|
"""
|
|
command = f"LRE {1 if enable else 0}"
|
|
return self._send_command(command)
|
|
|
|
def __del__(self):
|
|
"""Destructor - ensure cleanup"""
|
|
self.disconnect()
|