I want to use uart7 like other uart,but some err occur.
the uart7[D5 D8] link to another ext serial device(usb convert rs232), tx and rx cross connect.
the test interface is as follows.
the uart7.tx is fine, Every transmission is received correctly.
when other device send sth to uart7, the err occurs.
the error is as follows:
send bytes =8bytes, receive ok
send bytes<8bytes, receive nothing, the data “return” to sender
send bytes>8bytes, only receive 8bytes,More than 8, back to the sender
I found similar topics, But it didn’t help me out.
uart7 rx issues