Good Afternoon,

I have a problem to set up the UART1 ttyS1 on NanoPi NEO Air-LTS
I want to use the tiny Neo Air Module with both serial ports for an Dula (W)M-Bus Module from Solvimus

Is there a correct layout for the PINs and the way to config the Overlay and somthing else to get it work
I try since days to config and do loop-tests on UART1 ttyS1 and it‘s not working

I do a loopback an the serial port UART1 ttyS1 and UART2 ttyS2, UART2 ttyS2 is working, UART1 ttyS1 is not working. I think there is another service bound to the UART1 ttyS1.

Please find down all information about the config:

Welcome to Ubuntu 16.04.7 LTS 4.14.111
System load: 0.04 Up time: 22 min Local users: 2
Memory usage: 12 % of 491Mb IP: 192.168.160.150
CPU temp: 31°C
Usage of /: 73% of 6.1G

root@NanoPi-NEO-Air:~# sudo stty -F /dev/ttyS1 -a
speed 9600 baud; rows 0; columns 0; line = 0;
intr = <undef>; quit = <undef>; erase = <undef>; kill = <undef>; eof = <undef>; eol = <undef>; eol2 = <undef>; swtch = <undef>;
start = <undef>; stop = <undef>; susp = <undef>; rprnt = <undef>; werase = <undef>; lnext = <undef>; discard = <undef>;
min = 0; time = 0;
-parenb -parodd -cmspar cs8 -hupcl -cstopb cread clocal -crtscts
-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr -icrnl -ixon -ixoff -iuclc -ixany -imaxbel -iutf8
-opost -olcuc -ocrnl -onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0
-isig -icanon -iexten -echo -echoe -echok -echonl -noflsh -xcase -tostop -echoprt -echoctl -echoke -flusho -extproc


root@NanoPi-NEO-Air:~# cat /proc/tty/driver/serial
serinfo:1.0 driver revision:
0: uart:U6_16550A mmio:0x01C28000 irq:44 tx:11093 rx:0 RTS|DTR
1: uart:U6_16550A mmio:0x01C28400 irq:45 tx:46 rx:0 RTS|CTS|DTR
2: uart:U6_16550A mmio:0x01C28800 irq:46 tx:40 rx:0 CTS
3: uart:U6_16550A mmio:0x01C28C00 irq:47 tx:35934 rx:2669 RTS|CTS|DTR
4: uart:unknown port:00000000 irq:0
5: uart:unknown port:00000000 irq:0
6: uart:unknown port:00000000 irq:0
7: uart:unknown port:00000000 irq:0

dmesg | grep tty
[ 0.000000] Kernel command line: console=ttyS0,115200 earlyprintk root=/dev/mmcblk0p2 rootfstype=ext4 rw rootwait fsck.repair=yes panic=10 fbcon=map:0 data=/dev/mmcblk0p3 snd-soc-core.pmdown_time=3600000
[ 0.610745] console [ttyS0] disabled
[ 0.630936] 1c28000.serial: ttyS0 at MMIO 0x1c28000 (irq = 44, base_baud = 1500000) is a U6_16550A
[ 1.405085] console [ttyS0] enabled
[ 1.431339] 1c28400.serial: ttyS1 at MMIO 0x1c28400 (irq = 45, base_baud = 1500000) is a U6_16550A
[ 1.462946] 1c28800.serial: ttyS2 at MMIO 0x1c28800 (irq = 46, base_baud = 1500000) is a U6_16550A
[ 1.492523] 1c28c00.serial: ttyS3 at MMIO 0x1c28c00 (irq = 47, base_baud = 1500000) is a U6_16550A


uEnv.txt
#################################################################
# General options
#################################################################
ramdisk=rootfs.cpio.gz
kernel=zImage
fix_addr 0x44500000
kernel_addr=0x46000000
ramdisk_addr=0x47000000
dtb_addr=0x48000000

debug_port=ttyS0,115200
fsck.repair=yes

# 0 = /dev/fb0, First framebuffer
# 1 = /dev/fb1, Second framebuffer
# README: linux/Documentation/fb/fbcon.txt
fbcon=map:0

#################################################################
# Overlay options
# README: /overlays/README.txt
#################################################################

#uart0/enable=no
uart1/enable=yes
#uart2/enable=no
#uart3/enable=no

#i2c0/enable=no
#i2c1/enable=no
#i2c2/enable=no

#spi0/enable=no

#pwm0/enable=no

#ir/enable=no

#tft28/enable=no
#tft28/speed=50000000
#tft28/rotate=90
#tft28/fps=33
#tft28/debug=0x0

#tft13/enable=no
#tft13/speed=50000000
#tft13/rotate=0
#tft13/fps=0x0
#tft13/debug=0x0


Thanks an regards
Stefan Timm

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