mohjam77 Posted August 19, 2019 Share Posted August 19, 2019 Armbianmonitor: http://ix.io/1SGR Hi. I'm trying to connect my orange pi to pc using UART3 but it doesn't work. I connected UART3 to my pc using USB to serial converter and my pc recognized it. so I open a serial session in putty. then when I tried to connect in orange pi it doesn't work. I tried command minicom -b 9600 -D /dev/ttyS3 but it doesn't work. system properties: Linux orangepipcplus 4.19.62-sunxi #5.92 SMP Wed Jul 31 22:07:23 CEST 2019 armv7l GNU/Linux dmesg | grep tty output: [ 0.000000] Kernel command line: root=/dev/mmcblk0p1 rootwait rootfstype=ext4 console=ttyS0,115200 console=tty1 hdmi.audio=EDID:0 disp.screen0_output_mode=1920x1080p60 panic=10 consoleblank=0 loglevel=1 ubootpart=a7e8d17a-01 ubootsource=mmc usb-storage.quirks=0x2537:0x1066:u,0x2537:0x1068:u sunxi_ve_mem_reserve=0 sunxi_g2d_mem_reserve=0 sunxi_fb_mem_reserve=16 cgroup_enable=memory swapaccount=1 [ 0.000186] console [tty1] enabled [ 1.903679] console [ttyS0] disabled [ 1.923829] 1c28000.serial: ttyS0 at MMIO 0x1c28000 (irq = 44, base_baud = 1500000) is a U6_16550A [ 1.923882] console [ttyS0] enabled [ 1.946824] 1c28400.serial: ttyS1 at MMIO 0x1c28400 (irq = 45, base_baud = 1500000) is a U6_16550A [ 1.969687] 1c28800.serial: ttyS2 at MMIO 0x1c28800 (irq = 46, base_baud = 1500000) is a U6_16550A [ 1.990464] 1c28c00.serial: ttyS3 at MMIO 0x1c28c00 (irq = 47, base_baud = 1500000) is a U6_16550A and output of cat /proc/device-tree/soc/serial@1c28c00/status is okay. and armbianEnv.txt contains: verbosity=1 console=both overlay_prefix=sun8i-h3 overlays=i2c0 uart1 uart2 uart3 usbhost0 usbhost1 usbhost2 usbhost3 usbstoragequirks=0x2537:0x1066:u,0x2537:0x1068:u Thanks for your help. Link to comment Share on other sites More sharing options...
lanefu Posted August 19, 2019 Share Posted August 19, 2019 Try 115200 BPS instead of 9600 Link to comment Share on other sites More sharing options...
mohjam77 Posted August 19, 2019 Author Share Posted August 19, 2019 3 minutes ago, lanefu said: Try 115200 BPS instead of 9600 Still not working ... Link to comment Share on other sites More sharing options...
lanefu Posted August 19, 2019 Share Posted August 19, 2019 Just confirming--- you're using a USB TTL serial adapter right. not USB-RS232? Link to comment Share on other sites More sharing options...
mohjam77 Posted August 19, 2019 Author Share Posted August 19, 2019 12 minutes ago, lanefu said: Just confirming--- you're using a USB TTL serial adapter right. not USB-RS232? I'm trying with both. but can you explain their difference? Link to comment Share on other sites More sharing options...
lanefu Posted August 19, 2019 Share Posted August 19, 2019 6 minutes ago, mohjam77 said: I'm trying with both. but can you explain their difference? Signaling voltage... TTL serial is 3.3V - 5V signalling.. RS232 is 12v. You'll definitely want to use the USB TTL serial on your PC. Link to comment Share on other sites More sharing options...
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