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sx126x.py
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# This code came from https://www.waveshare.com/w/upload/9/9d/SX126X_LoRa_HAT_Demo.zip
# I do not warranty this code but only provided it as a learning resource
# To download on your raspberry pi
# cd Documents
# wget https://www.waveshare.com/w/upload/9/9d/SX126X_LoRa_HAT_Demo.zip
# unzip SX126X_LoRa_HAT_Demo.zip
import RPi.GPIO as GPIO
import serial
import time
class sx126x:
M0 = 22
M1 = 27
# if the header is 0xC0, then the LoRa register settings dont lost when it poweroff, and 0xC2 will be lost.
# cfg_reg = [0xC0,0x00,0x09,0x00,0x00,0x00,0x62,0x00,0x17,0x43,0x00,0x00]
cfg_reg = [0xC2, 0x00, 0x09, 0x00, 0x00, 0x00, 0x62, 0x00, 0x12, 0x43, 0x00, 0x00]
get_reg = bytes(12)
rssi = False
addr = 65535
serial_n = ""
addr_temp = 0
#
# start frequence of two lora module
#
# E22-400T22S E22-900T22S
# 410~493MHz or 850~930MHz
start_freq = 850
#
# offset between start and end frequence of two lora module
#
# E22-400T22S E22-900T22S
# 410~493MHz or 850~930MHz
offset_freq = 18
# power = 22
# air_speed =2400
SX126X_UART_BAUDRATE_1200 = 0x00
SX126X_UART_BAUDRATE_2400 = 0x20
SX126X_UART_BAUDRATE_4800 = 0x40
SX126X_UART_BAUDRATE_9600 = 0x60
SX126X_UART_BAUDRATE_19200 = 0x80
SX126X_UART_BAUDRATE_38400 = 0xA0
SX126X_UART_BAUDRATE_57600 = 0xC0
SX126X_UART_BAUDRATE_115200 = 0xE0
SX126X_PACKAGE_SIZE_240_BYTE = 0x00
SX126X_PACKAGE_SIZE_128_BYTE = 0x40
SX126X_PACKAGE_SIZE_64_BYTE = 0x80
SX126X_PACKAGE_SIZE_32_BYTE = 0xC0
SX126X_Power_22dBm = 0x00
SX126X_Power_17dBm = 0x01
SX126X_Power_13dBm = 0x02
SX126X_Power_10dBm = 0x03
lora_air_speed_dic = {
1200: 0x01,
2400: 0x02,
4800: 0x03,
9600: 0x04,
19200: 0x05,
38400: 0x06,
62500: 0x07
}
lora_power_dic = {
22: 0x00,
17: 0x01,
13: 0x02,
10: 0x03
}
lora_buffer_size_dic = {
240: SX126X_PACKAGE_SIZE_240_BYTE,
128: SX126X_PACKAGE_SIZE_128_BYTE,
64: SX126X_PACKAGE_SIZE_64_BYTE,
32: SX126X_PACKAGE_SIZE_32_BYTE
}
def __init__(self, serial_num, freq, addr, power, rssi, air_speed=2400, \
net_id=0, buffer_size=240, crypt=0, \
relay=False, lbt=False, wor=False):
self.rssi = rssi
self.addr = addr
self.freq = freq
self.serial_n = serial_num
self.power = power
# Initial the GPIO for M0 and M1 Pin
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(self.M0, GPIO.OUT)
GPIO.setup(self.M1, GPIO.OUT)
GPIO.output(self.M0, GPIO.LOW)
GPIO.output(self.M1, GPIO.HIGH)
# The hardware UART of Pi3B+,Pi4B is /dev/ttyS0
self.ser = serial.Serial(serial_num, 9600)
self.ser.flushInput()
self.set(freq, addr, power, rssi, air_speed, net_id, buffer_size, crypt, relay, lbt, wor)
def set(self, freq, addr, power, rssi, air_speed=2400, \
net_id=0, buffer_size=240, crypt=0, \
relay=False, lbt=False, wor=False):
self.send_to = addr
self.addr = addr
# We should pull up the M1 pin when sets the module
GPIO.output(self.M0, GPIO.LOW)
GPIO.output(self.M1, GPIO.HIGH)
time.sleep(0.1)
low_addr = addr & 0xff
high_addr = addr >> 8 & 0xff
net_id_temp = net_id & 0xff
if freq > 850:
freq_temp = freq - 850
self.start_freq = 850
self.offset_freq = freq_temp
elif freq > 410:
freq_temp = freq - 410
self.start_freq = 410
self.offset_freq = freq_temp
air_speed_temp = self.lora_air_speed_dic.get(air_speed, None)
# if air_speed_temp != None
buffer_size_temp = self.lora_buffer_size_dic.get(buffer_size, None)
# if air_speed_temp != None:
power_temp = self.lora_power_dic.get(power, None)
# if power_temp != None:
if rssi:
# enable print rssi value
rssi_temp = 0x80
else:
# disable print rssi value
rssi_temp = 0x00
# get crypt
l_crypt = crypt & 0xff
h_crypt = crypt >> 8 & 0xff
if relay == False:
self.cfg_reg[3] = high_addr
self.cfg_reg[4] = low_addr
self.cfg_reg[5] = net_id_temp
self.cfg_reg[6] = self.SX126X_UART_BAUDRATE_9600 + air_speed_temp
#
# it will enable to read noise rssi value when add 0x20 as follow
#
self.cfg_reg[7] = buffer_size_temp + power_temp + 0x20
self.cfg_reg[8] = freq_temp
#
# it will output a packet rssi value following received message
# when enable eighth bit with 06H register(rssi_temp = 0x80)
#
self.cfg_reg[9] = 0x43 + rssi_temp
self.cfg_reg[10] = h_crypt
self.cfg_reg[11] = l_crypt
else:
self.cfg_reg[3] = 0x01
self.cfg_reg[4] = 0x02
self.cfg_reg[5] = 0x03
self.cfg_reg[6] = self.SX126X_UART_BAUDRATE_9600 + air_speed_temp
#
# it will enable to read noise rssi value when add 0x20 as follow
#
self.cfg_reg[7] = buffer_size_temp + power_temp + 0x20
self.cfg_reg[8] = freq_temp
#
# it will output a packet rssi value following received message
# when enable eighth bit with 06H register(rssi_temp = 0x80)
#
self.cfg_reg[9] = 0x03 + rssi_temp
self.cfg_reg[10] = h_crypt
self.cfg_reg[11] = l_crypt
self.ser.flushInput()
for i in range(2):
self.ser.write(bytes(self.cfg_reg))
r_buff = 0
time.sleep(0.2)
if self.ser.inWaiting() > 0:
time.sleep(0.1)
r_buff = self.ser.read(self.ser.inWaiting())
if r_buff[0] == 0xC1:
pass
# print("parameters setting is :",end='')
# for i in self.cfg_reg:
# print(hex(i),end=' ')
# print('\r\n')
# print("parameters return is :",end='')
# for i in r_buff:
# print(hex(i),end=' ')
# print('\r\n')
else:
pass
# print("parameters setting fail :",r_buff)
break
else:
print("setting fail,setting again")
self.ser.flushInput()
time.sleep(0.2)
print('\x1b[1A', end='\r')
if i == 1:
print("setting fail,Press Esc to Exit and run again")
# time.sleep(2)
# print('\x1b[1A',end='\r')
GPIO.output(self.M0, GPIO.LOW)
GPIO.output(self.M1, GPIO.LOW)
time.sleep(0.1)
def get_settings(self):
# the pin M1 of lora HAT must be high when enter setting mode and get parameters
GPIO.output(M1, GPIO.HIGH)
time.sleep(0.1)
# send command to get setting parameters
self.ser.write(bytes([0xC1, 0x00, 0x09]))
if self.ser.inWaiting() > 0:
time.sleep(0.1)
self.get_reg = self.ser.read(self.ser.inWaiting())
# check the return characters from hat and print the setting parameters
if self.get_reg[0] == 0xC1 and self.get_reg[2] == 0x09:
fre_temp = self.get_reg[8]
addr_temp = self.get_reg[3] + self.get_reg[4]
air_speed_temp = self.get_reg[6] & 0x03
power_temp = self.get_reg[7] & 0x03
print("Frequence is {0}.125MHz.", fre_temp)
print("Node address is {0}.", addr_temp)
print("Air speed is {0} bps" + lora_air_speed_dic.get(None, air_speed_temp))
print("Power is {0} dBm" + lora_power_dic.get(None, power_temp))
GPIO.output(M1, GPIO.LOW)
#
# the data format like as following
# "node address,frequence,payload"
# "20,868,Hello World"
def send(self, data):
GPIO.output(self.M1, GPIO.LOW)
GPIO.output(self.M0, GPIO.LOW)
time.sleep(0.1)
self.ser.write(data)
# if self.rssi == True:
# self.get_channel_rssi()
time.sleep(0.1)
def receive(self):
if self.ser.inWaiting() > 0:
time.sleep(0.5)
r_buff = self.ser.read(self.ser.inWaiting())
print("receive message from node address with frequence\033[1;32m %d,%d.125MHz\033[0m" % (
(r_buff[0] << 8) + r_buff[1], r_buff[2] + self.start_freq), end='\r\n', flush=True)
print("message is " + str(r_buff[3:-1]), end='\r\n')
# print the rssi
if self.rssi:
# print('\x1b[3A',end='\r')
print("the packet rssi value: -{0}dBm".format(256 - r_buff[-1:][0]))
self.get_channel_rssi()
else:
pass
# print('\x1b[2A',end='\r')
def get_channel_rssi(self):
GPIO.output(self.M1, GPIO.LOW)
GPIO.output(self.M0, GPIO.LOW)
time.sleep(0.1)
self.ser.flushInput()
self.ser.write(bytes([0xC0, 0xC1, 0xC2, 0xC3, 0x00, 0x02]))
time.sleep(0.5)
re_temp = bytes(5)
if self.ser.inWaiting() > 0:
time.sleep(0.1)
re_temp = self.ser.read(self.ser.inWaiting())
if re_temp[0] == 0xC1 and re_temp[1] == 0x00 and re_temp[2] == 0x02:
print("the current noise rssi value: -{0}dBm".format(256 - re_temp[3]))
# print("the last receive packet rssi value: -{0}dBm".format(256-re_temp[4]))
else:
# pass
print("receive rssi value fail")
# print("receive rssi value fail: ",re_temp)