Allwinner V3s prototype SBC
Features :
- Allwinner V3s SoC 1.2Ghz cortex-A with 64MB ram
- STM32F0, accessible through i2c and UART
- Interface for 0.91" OLED screen
- CH340N for serial through USB
- 40 pin screen interface for Adafruit 7"
- Audio with 3.5mm jack
- 8GB eMMC
Update 15/01/2024 Received the Rev B, changes are in the readme of its folder, main improvements are :
- Ethernet port right side
- Changed power supply of Serial to USB chip for the board own power, no accidental pull down now
- Heartbeat led added
- Added +5V port
- Added buttons
- EEPROM
- More leds...
Update 31/07/2023
- I realized that the LED I added for RX on UART0 is pulling the signal down if no USB with power is connected, resulting in getting stuck in uboot prompt at start, I will desolder it.
- forgot pull-up for I2C, so PMIC was impossible to talk to, fixed with internal pull-up in device tree.
- Tested LCD backlight, it works
- Tested LED on the back side with PWM, works fine too, I may use that with a kernel module to signal statuses. (uploaded a pic for it)
- Need to try transfering Uboot and Linux on eMMC
Update 05/05/2023
- Ethernet port LNK led is not working, mixed up connections, the eth connector has pin 9 as anode and 10 cathode, but on Kicad this was inverted.
- Board booting fine with kernel 6.1
- Made a custom device tree but with sunxi dtsi
- eMMC can be partitioned and formatted, perf test show +/- 40MB/s write or read
- Ethernet works, need to configure /etc/network/interfaces and add it to rootfs overlay though
Update 23/04/2023 :
- Ethernet port is inverted... 3D model on kicad was not accurate, lesson learned. Will replace with vertical models
- Green external led for LNK is too bright, Vf is equal to 2.7V for a forward current of 1mA and not typical 3V, so current in the end is more like 2mA
- Didn't test screen, need to update BSP with new device tree
- Power consumption is around 80mA, not bad
Board received :
Board with vital LEDs :
