So I have a circuit board (IWR6843ISK) that I want to connect to RPI400 via USB serial to send and receive data. Here are some details:
This board uses a USB to dual UART bridge (micro USB port).
I've tested this board connecting to both a windows 10 PC and a Linux VM on Mac (ubuntu 20.04). Both via USB-C and both works.
The RPI400 board is flashed with Ubuntu 20.04 (for ROS Noetic)
dmesg on my RPI is showing the following:
~$ dmesg | grep "tty" [ 0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=1 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 bcm2708_fb.fbwidth=0 bcm2708_fb.fbheight=0 bcm2708_fb.fbswap=1 smsc95xx.macaddr=E4:5F:01:07:54:98 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 elevator=deadline net.ifnames=0 console=ttyS0,115200 dwc_otg.lpm_enable=0 console=tty1 root=LABEL=writable rootfstype=ext4 rootwait fixrtc quiet splash quiet splash [ 0.000273] printk: console [tty1] enabled [ 1.505079] fe201000.serial: ttyAMA0 at MMIO 0xfe201000 (irq = 14, base_baud = 0) is a PL011 rev2 [ 1.509591] printk: console [ttyS0] disabled [ 1.509620] fe215040.serial: ttyS0 at MMIO 0x0 (irq = 16, base_baud = 62500000) is a 16550 [ 1.523278] printk: console [ttyS0] enabled [ 6.537357] systemd: Created slice system-serial\x2dgetty.slice.
I'm pretty sure neither ttyS0 nor ttyAMA0 is related to the USB/UART connection (1 is for the gpio UART pins and 1 is for Bluetooth).
Now my question is -- How can I get my rpi to send/receive serial data via the USB port? Or do I have to resort to using a microusb breakout board and connect the board to my rpi400 via gpio?