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microsdi12.py
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microsdi12.py
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from machine import Pin
from machine import UART
import utime
import sys
class SDI12:
def __init__(self, pin_txd, pin_rxd, pin_direction=None, uart_bus_id=1):
self.pin_txd = pin_txd
self.pin_rxd = pin_rxd
self.pin_dir = pin_direction
self.uart = None
self.uart_bus_id = uart_bus_id
self.is_esp32 = (sys.platform.lower() == "esp32")
self.char_wait_duration_us = 8333
self.enable_wait_after_uart_write = True
self.dual_direction_pins = False
self.pin_drv = None
self.pin_rcv = None
self.delay_ms_after_send = None
def set_dual_direction_pins(self, pin_drv, pin_rcv):
self.pin_drv = pin_drv
self.pin_rcv = pin_rcv
self.dual_direction_pins = True
def wait_after_each_send(self, delay_ms):
self.delay_ms_after_send = delay_ms
def set_timing_params(self, char_wait_duration_us):
self.char_wait_duration_us = char_wait_duration_us
def set_wait_after_uart_write(self, wait_enabled):
self.enable_wait_after_uart_write = wait_enabled
def _send(self, cmd, timeout_ms=2500, termination_line=None):
if self.uart:
self.uart.deinit()
self.p_tx = Pin(self.pin_txd, mode=Pin.OUT)
self.p_dir = None
if self.pin_dir:
self.p_dir = Pin(self.pin_dir, mode=Pin.OUT)
elif self.dual_direction_pins:
self.p_drv = Pin(self.pin_drv, mode=Pin.OUT)
self.p_rcv = Pin(self.pin_rcv, mode=Pin.OUT)
self.p_tx.value(0)
if self.p_dir:
self.p_dir.value(1) # set output dir
elif self.dual_direction_pins:
self.p_drv.value(1)
self.p_rcv.value(1)
utime.sleep_us(int(self.char_wait_duration_us * 1.5)) # send BREAK
self.p_tx.value(1)
utime.sleep_us(self.char_wait_duration_us) # send MARK
if self.is_esp32:
self.uart = UART(self.uart_bus_id, baudrate=1200, bits=7, parity=2, stop=1, tx=self.pin_txd, rx=self.pin_rxd, timeout_char=75)
self.uart.init(baudrate=1200, bits=7, parity=2, stop=1, tx=self.pin_txd, rx=self.pin_rxd, timeout_char=75)
else:
self.uart = UART(self.uart_bus_id, baudrate=1200, bits=7, parity=UART.EVEN, stop=1, timeout_chars=75, pins=(self.pin_txd, self.pin_rxd))
print("SDI12 > [" + cmd + "]")
self.uart.write(cmd) # send command
if self.enable_wait_after_uart_write:
utime.sleep_us(8333 * len(cmd)) # wait to send command (byte time * command length)
if self.pin_dir:
self.p_dir.value(0) # output set to read
elif self.dual_direction_pins:
self.p_drv.value(0)
self.p_rcv.value(0)
start_timestamp = utime.ticks_ms()
timeout_timestamp = start_timestamp + timeout_ms
line = ""
while True:
remaining_bytes = self.uart.any()
if(utime.ticks_ms() >= timeout_timestamp):
break
if remaining_bytes > 0:
line_cur = self.uart.readline()
if line_cur:
try:
line_cur = line_cur.decode('utf-8').strip()
line += '\n' + line_cur
print(" < [" + line_cur + "]")
if termination_line is not None:
if line_cur == termination_line:
break
else:
break
except:
print("! " + str(line))
utime.sleep_ms(100)
if self.delay_ms_after_send:
utime.sleep_ms(self.delay_ms_after_send)
return line.strip() if line != "" else None
def is_active(self, address):
ack_act_cmd_resp = self._send(address + '!')
return (ack_act_cmd_resp == address)
def get_sensor_info(self, address):
manufacturer = None
model = None
id_cmd_resp = self._send(address + 'I!')
if id_cmd_resp and len(id_cmd_resp) >= 17:
manufacturer = id_cmd_resp[3:11].strip()
model = id_cmd_resp[11:17].strip()
return (manufacturer, model)
def get_sensor_info_ex(self, address):
manufacturer = None
model = None
version = None
extra_info = None
id_cmd_resp = self._send(address + 'I!')
if id_cmd_resp and len(id_cmd_resp) > 20:
manufacturer = id_cmd_resp[3:11].strip()
model = id_cmd_resp[11:17].strip()
version = id_cmd_resp[17:20].strip()
extra_info = id_cmd_resp[20:].strip()
return (manufacturer, model, version, extra_info)
def get_measurement(self, address, measurement_name="M", number_of_measurements_digit_count=1, force_wait_period=False):
values = None
# Request
meas_cmd_resp = self._send(address + measurement_name + '!')
if meas_cmd_resp and len(meas_cmd_resp) == (4+number_of_measurements_digit_count):
seconds_to_wait_max = int(meas_cmd_resp[1:4])
number_of_measurements = int(meas_cmd_resp[4:4+number_of_measurements_digit_count])
timeout = utime.ticks_ms() + seconds_to_wait_max * 1000
pending_bytes = self.uart.any()
while utime.ticks_ms() < timeout and (force_wait_period or pending_bytes == 0):
pending_bytes = self.uart.any()
if pending_bytes > 0:
try:
line = self.uart.readline()
print(" <~ [" + line.decode('utf-8').strip() + "]")
except:
print(" <~! [" + str(line) + "]")
if not force_wait_period:
break
utime.sleep_ms(10)
i = 0
values_read = 0
values = []
max_i = 9 # safety measure in case the sensor is unresponsive
while values_read < number_of_measurements and i < max_i:
resp = self._send(address + 'D' + str(i) + '!')
values = values + self._measurement_to_array(resp)
values_read = len(values)
i += 1
return values
def _measurement_to_array(self, measurement_response):
values = []
try:
# start from index 1 since response[0] is the address
i = 1
while i < len(measurement_response):
c = measurement_response[i]
if c == "-":
values.append(c)
elif c == "+":
values.append("")
else:
values[-1] += c
i += 1
except Exception as e:
print("Error processing generic sdi response: [{}]".format(measurement_response))
print(e)
return values
def close(self):
if self.dual_direction_pins:
try:
self.p_drv.value(0)
self.p_rcv.value(1)
except:
pass
if self.uart:
self.uart.deinit()