RS485 port does not support serial_rs485?

Chip Platform Rockchip
1

Type: Self-Compiled Firmware
SDK Package Name: Buildroot 20221212
Modification Content: my package
Log: log.zip

Device=iHC-3308GW. I have built firmware using your official instructions. My application gives errno 25 ‘Inappropriate ioctl for device’ for setting ttysWK0 and ttysWK1 ports with serial_rs485 using TIOCSRS485 IOCTL. Is RS-485 a true genuine RS-485 port, or some clone of RS-232 to RS-485 conversion without proper transmitter control? I am interested in setting delay_rts_before_send and delay_rts_after_send.
tchip_askquestions
log.zip (155 Bytes)

2

It is not a clone, these 4 serial ports are isolated on hardware and are independent serial ports.

3

The reply to the forum post may not be timely, you can send the question to my mailbox

email:
hjc@t-chip.com.cn

4

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