Hi all!
I've got a few CBB-Serial-r01 capes and I need to get rs485 out on Kernel
4.x.
On kernel 3.8, default build, I can get rs485 tx/rx going with manual GPIO
setting on the CBB-Serial-r01 cape.
With kernels 4.x I'm getting, issues. Currently, I'm trying it on 4.6-rc2.
So far: HDMI is disabled
UART4-RTSCTS device tree is loaded.
Transmitting data from external => beagle _ works_ and I see traffic on the
wire with oscilloscope, and the beagle recieves data.
Transmitting data _from_ the BBB shows RTS signal (which shows that the
UART4 rts/cts works), but no traffic for the data transmit.
However, when I in desperation hooked the oscilloscope to the rs232 pins on
the cape, I measure traffic when transmitting on those ports.
reader:
import serial
import struct, fcntl
ser = serial.Serial("/dev/ttyO4", 2400)
fd = ser.fileno()
serial_rs485 = struct.pack('hhhhhhhh', 1, 0, 0, 0, 0, 0, 0, 0)
res = fcntl.ioctl(fd, 0x542F, serial_rs485)
while True:
data = ser.read()
print(data)
----
Please tell me I've missed something obvious here.
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