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Pico433Lib.py
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Pico433Lib.py
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from machine import Pin
import time
class Rx:
long_delay = 500 #Half of the duration of the data transmission period.
short_delay = int(long_delay/2) #Time in microseconds. A quarter of the duration of the data transmission period.
package_size = 10 #Size of the package in bytes (excluding header size and size flag).
data_set = 0
data = [[]]
max_storage = 5
def __init__(self, pin_number, protocol, header):
self.rx_pin = Pin(pin_number, Pin.IN, Pin.PULL_DOWN)
self.protocol = protocol
self.header = header
print('Receiver set at:', self.rx_pin)
print('Expected package header:', header)
self.checkBit = protocol ^ 1
print("Waiting for signal to transition to", str(self.checkBit) + "...")
def listen(self):
num_bits = 0
byte = 0
self.num_bytes = 0
header_bits = 0
header_done = False
size_flag_done = False
self.errors = False
while (not self.errors) and (self.num_bytes < self.package_size):
while self.rx_pin.value() == self.checkBit:
time.sleep_us(self.short_delay)
if self.rx_pin.value() != self.checkBit:
self.errors = True
self.data[self.data_set].clear()
if header_done and self.num_bytes != self.package_size:
print("\n``````````````````````")
print("Transmission Error!")
print("Bytes received:", self.num_bytes)
print("Expected package size:", self.package_size)
print("``````````````````````")
else:
self.current_bit = self.checkBit ^ self.protocol
time.sleep_us(self.long_delay)
if self.rx_pin.value() == self.checkBit:
self.checkBit = self.checkBit ^ 1
#Measure processing time
#timeOne = time.ticks_us()
num_bits += 1
byte = byte << 1
byte = byte | self.current_bit
if (not header_done) and self.header[header_bits] == self.current_bit:
header_bits += 1
if header_bits == len(self.header):
header_done = True
num_bits = 0
byte = 0
elif header_done:
if (not size_flag_done):
if num_bits == 8:
self.package_size = byte
byte = 0
num_bits = 0
size_flag_done = True
else:
if num_bits == 8:
print(chr(byte), end='')
self.__store_byte(byte)
self.num_bytes += 1
byte = 0
num_bits = 0
if self.num_bytes == self.package_size:
self.__package_completed()
else:
self.errors = True
self.data[self.data_set].clear()
if header_done and self.num_bytes != self.package_size:
print("\n``````````````````````")
print("Transmission Error!")
print("Bytes received:", self.num_bytes)
print("Expected package size:", self.package_size)
print("``````````````````````")
#Measure processing time
#timeTwo = time.ticks_us()
#totalTime = time.ticks_diff(timeTwo, timeOne)
#print(totalTime)
def __package_completed(self):
if len(self.data) < self.max_storage + 1:
self.data.append([])
self.data_set += 1
else:
self.data.pop(0)
self.data.append([])
def __store_byte(self, byte):
self.data[self.data_set].append(byte)
def get_latest(self):
hexStr = ""
index = self.data_set - 1
for i in range(len(self.data[index])):
hexStr += hex(self.data[index][i])
hexStr += ":"
return hexStr
def set_bit_time(self, time):
self.long_delay = int(time/2)
self.short_delay = int(time/4)
def set_max_storage(self, size):
self.max_storage = size
class Tx:
long_delay = 500 #in microseconds
def __init__(self, pin, protocol, header):
self.pin = Pin(pin, Pin.OUT)
self.pin.value(protocol)
self.protocol = protocol
self.header = header
print("Transceiver set at:", self.pin)
print("Protocol set at:", protocol)
print("Header to be sent:", header)
def to_bits(self, string):
bits = ""
for i in string:
bits2 = ''.join('{:08b}'.format(ord(j)) for j in i)
bits += bits2
return bits
def send_bit(self, bit):
if self.protocol == 0:
if bit == 1 or bit == '1':
time.sleep_us(self.long_delay)
self.pin.value(1)
time.sleep_us(self.long_delay)
self.pin.value(0)
else:
self.pin.value(1)
time.sleep_us(self.long_delay)
self.pin.value(0)
time.sleep_us(self.long_delay)
else:
if bit == 1 or bit == '1':
self.pin.value(1)
time.sleep_us(self.long_delay)
self.pin.value(0)
time.sleep_us(self.long_delay)
else:
time.sleep_us(self.long_delay)
self.pin.value(1)
time.sleep_us(self.long_delay)
self.pin.value(0)
def send_message(self, message):
sending = True
while sending == True:
if len(message) > 255:
short_message = message[:255]
message = message[255:]
else:
short_message = message
sending = False
size_flag = '{:08b}'.format(len(short_message))
short_message = self.to_bits(short_message)
for i in range(len(self.header)):
self.send_bit(self.header[i])
for i in range(len(size_flag)):
self.send_bit(size_flag[i])
for i in range(len(short_message)):
self.send_bit(short_message[i])
time.sleep(1/8)
def set_bit_time(self, time):
self.long_delay = time