I am writing a kernel module for our project. Inside the kernel module, I
have to read and write the UART of BeagleBone Black (P9_24 and P9_26,
uart1_txd and uart1_rxd). The uart is interfacing with out device. I used
the “*f_ser = filp_open("/dev/ttyO1",O_RDWR|O_NOCTTY|O_NONBLOCK, 0644);*”
to open it. I used the “*f_ser *->f_op->unlocked_ioctl” with commands “
*TCGETS*” and “*TCSETS*” to change baudrate. The problem is when I write
something using vfs_write to our device and our device sent a response back
and then I am expecting something read back by using vfs_read. But
sometimes, the read back is not what I want (it looks some left over from
previous command). I tried to use “*f_ser *->f_op->unlocked_ioctl” with
commands “TCIOFLUSH” to flush before the write but the function gives an
error code -25, which is ENOTTY. Does anybody knows how to flush the uart
inside a kernel module?
Thanks a lot.
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