LattePanda Forum

CPU m3-7Y30 is Kaby Lake "Y" 7th gen CORE M processor 4.5W TDP
It supports max of 10 PCIe lanes, on board, 6 available/used:
PCIe root-port #3: used by Intel WiFi (+ BT) module
PCIe root-port #4: Gigabit Ethernet RT8111
PCIe root-port #5 (and 6, 7, 8): M.2 M-Key (max 4 lanes and can do x4),
PCIe root-port #9 (and 10): M.2 E-Key (max 2 lanes and can do x2)

CPU Fan is very quiet.

USB ports used:
1) one USB is used by Intel (WiFi+) BT module
2) a USB 1.1 port (USB-serial) used by EXAR XR21V1410 (CDC-ACM driver aka built-in "driverless" driver), in Win10 it's detected as COM4
this is exposed on top-side of the RS232 connectors (Orange-colored dotted line block),
there is a proper RS232 driver ( -5.73V to +5.73V RS232 voltage level) on board
3) another USB port back-to-back connects to on-board Arduino Leonardo's USB port (latter emulates a COM port, detected by Win10 as COM3)
4) one more USB port exposed on Key-E M.2 slot
5) (not sure, not tested yet) stated as USB2.0 top-side, black-colored dotted line block
6) 3 USB 3.0 "type-A" female connectors

Usable UARTs:
# 2) above
As well as exposed connection leads on E-key M.2 slot

One SATA port, exposed in key-M M.2 slot.
<-- that key M slot is dual mode: SATA or PCIe (such as used by NVMe SSD) one way or another

I had tried using a $5 "key-M M.2" to "PCIe 4x adapter" in the past to connects to regular sized PCIe cards in the past.
I don't see there is any problem using the same method for LPA864.
<-- I had tested PCIe graphics card, SATA RAID card, quad-fast gigabit Ethernet card, etc. All works.

(not tested) PCM IN and OUT on E Key M.2 slot.

ccs_hello

BTW, found out LPA's USB type-C port, when external DC power is used to supply power, it's in PD 2.0 sink mode.

a USB 1.1 port (USB-serial) used by EXAR XR21V1410 (CDC-ACM driver aka built-in "driverless" driver), in Win10 it's detected as COM4
this is exposed on top-side of the RS232 connectors (Orange-colored dotted line block),
there is a proper RS232 driver ( -5.73V to +5.73V RS232 voltage level) on board

On Linux RS232 is reachable through /dev/ttyXRUSB0

To test connect TXD with RXD and you should see what you type after

Adding signals by grouping

Thanks for the work and clear info

What if Windows 10 does not find the on-board Arduino Leonardo USB port?

Let's dive deeper into the theory of operation....

Arduino Leonardo (ATMega 32u4) bootloader, out of factory (and every time the Arduino IDE is properly loading the code into the 32u4),
the CDC-ACM is part of the firmware, making itself look as if a virtual-communication (virtual COM port) USB device is plugging into the PC (the LP Alpha itself.)
From PC perspective, on one of its own USB port, it will see a USB HID 2341:8036 device attached to it.

LP Alpha's USB and Arduino Leonardo's USB ports are back-to-back connected. PC side is USB master and Arduino side is USB slave device.

If Arduino's IDE USB device driver is properly installed, the *.INF file will identify 2341:8036 as a CDC-ACM device, enumerate/load the device driver and thus seeing such "USB device (Arduino Leonardo)" as a device on its COM port (in win10, it's COM3; in Linux it's dev/ttyACM0 I think.)

Made some slight revisions:
1) pointing out the ICSP (SPI) config port for Arduino Leonardo (ATMega32u4) for reprogramming 32u4's firmware
2) it seems that the I2S port may be using the 3.3V system

Hi, I would like to know if I can get the power from the DC input to drive a motor? And what if I power the board through USB C, can I still draw power from the DC input pin?

Is there a schematic on the power circuit that I can check?

Thanks a lot!

Best Regards,

Yotsclee

No. The 4-pin DC_in is input only.