SX1231-TXDemo.spin

{
----------------------------------------------------------------------------------------------------
    Filename:       SX1231-RXDemo.spin
    Description:    Simple receive demo of the SX1231 driver
    Author:         Jesse Burt
    Started:        Dec 15, 2020
    Updated:        Oct 14, 2024
    Copyright (c) 2024 - See end of file for terms of use.
----------------------------------------------------------------------------------------------------
}

CON

    _clkmode = xtal1+pll16x
    _xinfreq = 5_000_000


OBJ

    ser:    "com.serial.terminal.ansi" | SER_BAUD=115_200
    time:   "time"
    radio:  "wireless.transceiver.sx1231" | CS=0, SCK=1, MOSI=2, MISO=3, RST=4
    str:    "string"


VAR

    byte _txbuff[radio.PAYLD_LEN_MAX]


PUB main() | count, sz, user_str

    setup()
    ser.pos_xy(0, 3)
    ser.strln(@"Transmit mode")

    ' user-modifiable string to send over the air
    ' NOTE: the format should match the parameters in the sprintf() call below
    user_str := @"This is message # $%04.4x"


' -- TX/RX settings
    radio.preset_tx4k8()                        ' preset settings: FSK, 4800bps
    radio.carrier_freq(902_300_000)             ' US 902.3MHz
    radio.syncwd_len(8)                         ' syncword bytes 1..8 (set syncword accordingly)
    radio.set_syncwd( string($E7, $E7, $E7, $E7, $E7, $E7, $E7, $E7) )
' --

' -- TX-specific settings
    ' transmit power
    ' (-18..13 is routed to RFO pin, higher is routed to PABOOST pin)
    radio.tx_pwr(13)                            ' -18..20dBm
' --

    count := 0
    repeat
        ' clear the temporary string buffer and copy the user string with a counter to it
        bytefill(@_txbuff, 0, radio.PAYLD_LEN_MAX)
        str.sprintf1(@_txbuff, user_str, count++)

        ' get the final size of the string and tell the radio about it
        sz := strsize(@_txbuff)
        radio.payld_len(sz)
        radio.fifo_thresh(radio.payld_len()-1)

        ' show what will be transmitted
        ser.pos_xy(0, 5)
        ser.printf1(@"Transmitting %d bytes:\n\r", sz)
        ser.hexdump(@_txbuff, 0, 4, sz, 16 <# sz)

        ' queue and transmit it
        radio.tx_payld(8, @_txbuff)             ' queue the data

        time.msleep(1000)                       ' wait in between packets
                                                ' (don't abuse the airwaves)


PUB setup()

    ser.start()
    time.msleep(30)
    ser.clear()
    ser.strln(@"Serial terminal started")

    if ( radio.start() )
        ser.strln(@"SX1231 driver started")
    else
        ser.strln(@"SX1231 driver failed to start - halting")
        repeat


DAT
{
Copyright 2024 Jesse Burt

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
associated documentation files (the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge, publish, distribute,
sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or
substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
}