rcsim opened a new pull request, #11500:
URL: https://github.com/apache/nuttx/pull/11500
## Summary
- Add support to rs-485 on stm32f401rc-rs485 board.
- Change default USART for NSH to USART6 as RS-485 transciever is connected
to USART2.
- Disable SW6 as it conflicts with USART6 (PC6).
## Impact
Users will be able to use RS-485 feature.
## Testing
Run modbus application at NSH:
nsh> modbus -help
USAGE: modbus [-d|e|s|q|h]
Where:
-d : Disable protocol stack
-e : Enable the protocol stack
-s : Show current status
-q : Quit application
-h : Show this information
nsh> modbus -e
PC Configuration:
Download and install mbpoll aplication:
sudo apt install mbpoll
Check which TTY USB port is being used by you USB to RS-485 converter:
sudo dmesg
[99846.668209] usb 1-1.3: Product: USB Serial
[99846.676313] ch341 1-1.3:1.0: ch341-uart converter detected
[99846.677454] usb 1-1.3: ch341-uart converter now attached to ttyUSB1
Run the mbpoll as below:
mbpoll -a 10 -b 38400 -t 3 -r 1000 -c 4 /dev/ttyUSB1 -R
At PC terminal you will see the mbpoll application receiving the random
values generated by STM32F401RC-RS485 and transmitted over RS-485:
mbpoll 1.0-0 - FieldTalk(tm) Modbus(R) Master Simulator
Copyright © 2015-2019 Pascal JEAN, https://github.com/epsilonrt/mbpoll
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions; type 'mbpoll -w' for details.
Protocol configuration: Modbus RTU
Slave configuration...: address = [10]
start reference = 1000, count = 4
Communication.........: /dev/ttyUSB1, 38400-8E1
t/o 1.00 s, poll rate 1000 ms
Data type.............: 16-bit register, input register table
-- Polling slave 10... Ctrl-C to stop)
[1000]: 58080 (-7456)
[1001]: 0
[1002]: 0
[1003]: 0
-- Polling slave 10... Ctrl-C to stop)
[1000]: 6100
[1001]: 0
[1002]: 0
[1003]: 0
-- Polling slave 10... Ctrl-C to stop)
[1000]: 51010 (-14526)
[1001]: 0
[1002]: 0
[1003]: 0
-- Polling slave 10... Ctrl-C to stop)
[1000]: 12528
[1001]: 0
[1002]: 0
[1003]: 0
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