Use of SP_LORA

    SP_LoRa module uses M-XL8 module, which has built-in LoRaTM modem and adjustable power amplifier LoRa module, which has high performance and high reliability.

    Parameters

    • Working frequency: 370MHz~1200Mhz
    • Transmitting power: 20dBm (maximum)
    • Communication interface: SPI
    • Antenna: External antenna, IPEX or welding
    • Receiving sensitivity: -148dbm
    • RSSI dynamic range: 127dB
    • Working voltage: 1.8V~6.3V
    • Working temperature: -40°C~80°C

    For detailed module information, please refer to LoRa Specification and Data Manual

    Instructions

    1. Preparation: Two development boards with the latest firmware burned, two sp_lora modules.

    2. Run: Connect the module, modify the configuration surrounded by config in sample code, and run the two development boards to send and receive separately Function, you can view the received and sent information on the terminal.

    The procedure is as follows:

    # init
    lora = SX127x(spi=spi1, pin_ss=cs)
    
    # lora reset
    rst.value(0)
    time.sleep_ms(10)
    rst.value(1)
    time.sleep_ms(100)
    lora.init()
    
    ####### receiver ##########
    receive(lora)
    
    ######## sender ###########
    # send(lora)
    
    '''output
    mpfs [/flash]> runfile lora_send.py
        transfer 6400 of 14576
        transfer 12800 of 14576
        transfer 14576 of 14576
    [Warning] function is used by fm.fpioa.GPIOHS7(pin:23)
    LoRa Sender
    Sending packet:
    Hello(0)
    
    mpfs [/sd]> runfile lora_recv.py
        transfer 6400 of 14576
        transfer 12800 of 14576
        transfer 14576 of 14576
    [Warning] function us used by fm.fpioa.GPIOHS7(pin:23)
    LoRa Receiver
    [Memory-free: 470080 allocated: 48064]
    *** Received message ***
    Hello(0)
    with RSSI: <bound_method 800d19e0 <SX127x object at 800f5700>.<function packetRssi at 0x800d3180>>
    '''
    

    The debugging and running tool used here is mpfshell, which is convenient to open two terminals to run scripts at the same time.

    The main steps are:

    • Create LoRa object (parameters: SPI object, chip selection pin)

    • Reset (pull the reset pin low or high), initialization.

    • Start sending or receiving.