Hello,
I am trying to do the same thing...
UART1 on OrangePi Zero v1.4 connected to this board... I even tried RaspberryPi zero but got merely garbage characters or nothing at all either.
https://www.aliexpress.com/item/1005002791042317.html?spm=a2g0o.order_list.0.0.3e081802uhgin9
I made sure multiple times that the GND is connected to GND, TX to RX and RX to TX, there is 3.3V across them... but yea nothing out of it 😕
I am trying to connect to the board using "minicom" app ... bitrate at 115200, 8bits, 1 stop bit..
Anyone has any idea please?
root@orangepizero:~# dmesg | grep tty
[ 0.000000] Kernel command line: root=UUID=6050f8f5-ece1-452f-bee0-da31fae65f6d rootwait rootfstype=ext4 splash=verbose console=ttyS0,115200 hdmi.audio=EDID:0 disp.screen0_output_mode=1920x1080p60 consoleblank=0 loglevel=1 ubootpart=0ebc1782-01 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
[ 1.957201] printk: console [ttyS0] disabled
[ 1.957375] 1c28000.serial: ttyS0 at MMIO 0x1c28000 (irq = 49, base_baud = 1500000) is a 16550A
[ 1.957861] printk: console [ttyS0] enabled
[ 1.960228] 1c28400.serial: ttyS1 at MMIO 0x1c28400 (irq = 50, base_baud = 1500000) is a 16550A
[ 1.961877] 1c28800.serial: ttyS2 at MMIO 0x1c28800 (irq = 51, base_baud = 1500000) is a 16550A
[ 1.963617] 1c28c00.serial: ttyS3 at MMIO 0x1c28c00 (irq = 52, base_baud = 1500000) is a 16550A
[ 7.847035] systemd[1]: Created slice system-getty.slice.
[ 7.856049] systemd[1]: Created slice system-serial\x2dgetty.slice.
[ 9.218226] systemd[1]: Found device /dev/ttyGS0.
[ 10.535763] systemd[1]: Found device /dev/ttyS0.
