This guys as implementing a protocol were two or more devices were transmitting at same time on RS485 and he end up developing a collision detection using a GPIO pin to detect the moment the TX started transmitting and compared the transmitted signal with the received signal:
https://forum.pjrc.com/index.php?threads/implementing-collision-detection-with-rs485.57591/
文章来源: https://acassis.wordpress.com/2024/12/08/collision-detection-on-rs485/
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