'''
Simple program sending an incrementing number over two UART channels to a TTL UART to RS485 converter.
Inspired by and partly based on Waveshare's example code to the 2 Channel RS485 HAT for the Pi Pico.
Copyright (C) 2024  Benjamin Burkhardt

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.
'''
from machine import UART, Pin
import time

uart0 = UART(0, baudrate=115200, tx=Pin(0), rx=Pin(1))
uart1 = UART(1, baudrate=115200, tx=Pin(4), rx=Pin(5))

print('Starting RS485 simple send...')
txData = b'Starting RS485 simple send...\r\n'
uart0.write(txData)
uart1.write(txData)


a=0
time.sleep(0.1)
while True:
    time.sleep(0.5) 
    a=a+1
    uart0.write("{}\r\n".format(a))
    print(f"[CH0]: Sent data: {a}")#shell output
    time.sleep(0.5) 
    a=a+1
    uart1.write("{}\r\n".format(a))
    print(f"[CH1]: Sent data: {a}")#shell output