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modbus.py
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modbus.py
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from uModbus.serial import Serial
from uModbus.tcp import TCPServer
import uModbus.const as ModbusConst
from machine import UART
from machine import Pin
import _thread
import time
class Modbus:
def __init__(self, exo, itf, addr_list):
self._exo = exo
self._itf = itf
self._addr_list = addr_list
def process(self):
request = self._itf.get_request(unit_addr_list=self._addr_list, timeout=0)
if request == None:
return False
self._process_req(request)
return True
def _beep(self, ms):
self._exo.buzzer(1)
time.sleep_ms(ms)
self._exo.buzzer(0)
def _do1_pulse(self, ms):
self._exo.DO1(1)
time.sleep_ms(ms)
self._exo.DO1(0)
def _process_req(self, request):
if request.function == ModbusConst.READ_DISCRETE_INPUTS:
if request.register_addr >= 101 and request.register_addr <= 102:
vals = []
for i in range(request.register_addr, request.register_addr + request.quantity):
if i == 101:
vals.append(self._exo.DI1())
elif i == 102:
vals.append(self._exo.DI2())
else:
request.send_exception(ModbusConst.ILLEGAL_DATA_ADDRESS)
break
request.send_response(vals)
else:
request.send_exception(ModbusConst.ILLEGAL_DATA_ADDRESS)
elif request.function == ModbusConst.READ_COILS:
if request.register_addr == 201:
request.send_response([self._exo.DO1()])
elif request.register_addr == 151:
ttl1 = Pin(self._exo.PIN_TTL1, mode=Pin.IN, pull=None)
request.send_response([ttl1()])
elif request.register_addr == 152:
ttl2 = Pin(self._exo.PIN_TTL2, mode=Pin.IN, pull=None)
request.send_response([ttl2()])
else:
request.send_exception(ModbusConst.ILLEGAL_DATA_ADDRESS)
elif request.function == ModbusConst.WRITE_SINGLE_COIL:
if request.register_addr == 201:
if request.data[0] == 0x00:
self._exo.DO1(0)
request.send_response()
elif request.data[0] == 0xFF:
self._exo.DO1(1)
request.send_response()
else:
request.send_exception(ModbusConst.ILLEGAL_DATA_VALUE)
elif request.register_addr == 151:
ttl1 = Pin(self._exo.PIN_TTL1, mode=Pin.OUT)
if request.data[0] == 0x00:
ttl1(0)
request.send_response()
elif request.data[0] == 0xFF:
ttl1(1)
request.send_response()
else:
request.send_exception(ModbusConst.ILLEGAL_DATA_VALUE)
elif request.register_addr == 152:
ttl2 = Pin(self._exo.PIN_TTL2, mode=Pin.OUT)
if request.data[0] == 0x00:
ttl2(0)
request.send_response()
elif request.data[0] == 0xFF:
ttl2(1)
request.send_response()
else:
request.send_exception(ModbusConst.ILLEGAL_DATA_VALUE)
else:
request.send_exception(ModbusConst.ILLEGAL_DATA_ADDRESS)
elif request.function == ModbusConst.READ_INPUT_REGISTER:
if request.register_addr >= 301 and request.register_addr <= 307:
vals = []
signed = []
for i in range(request.register_addr, request.register_addr + request.quantity):
if i == 301:
vals.append(int(self._exo.thpa.temperature() * 10))
signed.append(True)
elif i == 302:
vals.append(int(self._exo.thpa.humidity() * 10))
signed.append(False)
elif i == 303:
vals.append(int(self._exo.thpa.pressure() * 10))
signed.append(False)
elif i == 304:
vals.append(int(self._exo.thpa.gas_resistance() / 1000))
signed.append(False)
elif i == 305:
vals.append(int(self._exo.light.lux() * 10))
signed.append(False)
elif i == 306:
vals.append(self._exo.sound.avg())
signed.append(False)
elif i == 307:
vals.append(self._exo.sound.peak())
signed.append(False)
elif i == 308:
vals.append(self._exo.thpa.iaq())
signed.append(False)
elif i == 309:
vals.append(self._exo.thpa.iaq_trend())
signed.append(True)
else:
request.send_exception(ModbusConst.ILLEGAL_DATA_ADDRESS)
break
request.send_response(vals, signed=signed)
else:
request.send_exception(ModbusConst.ILLEGAL_DATA_ADDRESS)
elif request.function == ModbusConst.WRITE_SINGLE_REGISTER:
if request.register_addr == 401:
val = request.data_as_registers(signed=False)[0]
_thread.start_new_thread(self._beep, (val,))
request.send_response()
elif request.register_addr == 211:
val = request.data_as_registers(signed=False)[0]
_thread.start_new_thread(self._do1_pulse, (val,))
request.send_response()
else:
request.send_exception(ModbusConst.ILLEGAL_DATA_ADDRESS)
else:
request.send_exception(ModbusConst.ILLEGAL_FUNCTION)
class ModbusRTU(Modbus):
def __init__(self, exo, enable_ap_func, addr, baudrate=19200, data_bits=8, stop_bits=1, parity=UART.EVEN, pins=None, ctrl_pin=None):
super().__init__(
exo,
Serial(uart_id=1, baudrate=baudrate, data_bits=data_bits, stop_bits=stop_bits, parity=parity, pins=pins, ctrl_pin=ctrl_pin),
[addr]
)
self._enable_ap = enable_ap_func
Pin(pins[1], mode=Pin.IN, pull=None)
def _process_req(self, request):
if request.function == ModbusConst.WRITE_SINGLE_COIL:
if request.register_addr == 5:
if request.data[0] == 0xFF:
_thread.start_new_thread(self._enable_ap, ())
request.send_response()
else:
request.send_exception(ModbusConst.ILLEGAL_DATA_VALUE)
return
super()._process_req(request)
class ModbusTCP(Modbus):
def __init__(self, exo):
super().__init__(
exo,
TCPServer(),
None
)
def bind(self, local_ip, local_port=502):
self._itf.bind(local_ip, local_port)