Open hhb2017 opened 2 months ago
RS485只是硬件电平,跟软件没有关系吧
类似这种linux用户态的配置
From user-level, RS485 configuration can be get/set using the previous ioctls. For instance, to set RS485 you can use the following code::
/ Include definition for RS485 ioctls: TIOCGRS485 and TIOCSRS485 /
/ Open your specific device (e.g., /dev/mydevice): / int fd = open ("/dev/mydevice", O_RDWR); if (fd < 0) { / Error handling. See errno. / }
struct serial_rs485 rs485conf;
/ Enable RS485 mode: / rs485conf.flags |= SER_RS485_ENABLED;
/ Set logical level for RTS pin equal to 1 when sending: / rs485conf.flags |= SER_RS485_RTS_ON_SEND; / or, set logical level for RTS pin equal to 0 when sending: / rs485conf.flags &= ~(SER_RS485_RTS_ON_SEND);
/ Set logical level for RTS pin equal to 1 after sending: / rs485conf.flags |= SER_RS485_RTS_AFTER_SEND; / or, set logical level for RTS pin equal to 0 after sending: / rs485conf.flags &= ~(SER_RS485_RTS_AFTER_SEND);
/ Set rts delay before send, if needed: / rs485conf.delay_rts_before_send = ...;
/ Set rts delay after send, if needed: / rs485conf.delay_rts_after_send = ...;
/ Set this flag if you want to receive data even while sending data / rs485conf.flags |= SER_RS485_RX_DURING_TX;
if (ioctl (fd, TIOCSRS485, &rs485conf) < 0) { / Error handling. See errno. / }
/ Use read() and write() syscalls here... /
/ Close the device when finished: / if (close (fd) < 0) { / Error handling. See errno. / }
Describe problem solved by the proposed feature
RTT serial supports RS485 like linux RS485
Describe your preferred solution
No response
Describe possible alternatives
No response